1
                                                                     EXHIBIT 4-1

   __________________________________________________________________________

                          MCN INVESTMENT CORPORATION,
                                           AS ISSUER

                                       TO


                                   NBD BANK,
                                          AS TRUSTEE
                              _________________

                                   INDENTURE


                             SENIOR DEBT SECURITIES


                         DATED AS OF SEPTEMBER 1, 1995


                              _________________                




   __________________________________________________________________________

   2

                           MCN INVESTMENT CORPORATION

           RECONCILIATION AND TIE BETWEEN TRUST INDENTURE ACT OF 1939
                  AND INDENTURE, DATED AS OF SEPTEMBER 1, 1995



TRUST INDENTURE                                                                                 INDENTURE SECTION
 ACT SECTION
                                                                                                
Section  310 (a)(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           609
             (a)(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           609
             (a)(3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (a)(4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           608, 610
Section  311 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           613
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           613
Section  312 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           701, 702(a)
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           702(b)
             (c)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           702(c)
Section  313 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           703(a)
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (c)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           703(a), 703(b)
             (d)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           703(b)
Section  314 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           704
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (c)(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           102
             (c)(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           102
             (c)(3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (d)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (e)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           102
Section  315 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(a)
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           602
             (c)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(b)
             (d)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(c)
             (d)(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(a), 601(c)
             (d)(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(c)
             (d)(3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           601(c)
             (e)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           514
Section  316 (a)(1)(A)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           512
             (a)(1)(B)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           502, 513
             (a)(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           Not Applicable
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           508
Section  317 (a)(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           503
             (a)(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           504
             (b)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           1009
Section  318 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           107


- ---------------      

NOTE:  THIS RECONCILIATION AND TIE SHALL NOT, FOR ANY PURPOSE, BE DEEMED TO BE
A PART OF THIS INDENTURE.
   3

                               TABLE OF CONTENTS




                                                                                                   PAGE
                                                                                                   ----                   
                                                                                                  
RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           1

                                           ARTICLE ONE

                                 Definitions and Other Provisions
                                     of General Application

     SECTION 101.  Definitions.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           1
             Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Affiliate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Authenticating Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Bankruptcy Law   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Board of Directors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Board Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           2
             Business Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Capitalized Lease Obligation . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Capital Stock  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Commission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Common Depositary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Company  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Company Request or Company Order . . . . . . . . . . . . . . . . . . . . . . .           3
             Corporate Trust Office . . . . . . . . . . . . . . . . . . . . . . . . . . . .           3
             Covenant Defeasance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Custodian  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Defaulted Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Dollars and $  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Event of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Exchange Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Holder or Securityholder . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Indebtedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           4
             Indenture  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Interest Payment Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Maturity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             MCN  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Officer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Officer's Certificate  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Opinion of Counsel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5
             Original Issue Discount Security . . . . . . . . . . . . . . . . . . . . . . .           6
             Outstanding  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           6
             Paying Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
             Person . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
             Place of Payment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
             Project Finance Indebtedness . . . . . . . . . . . . . . . . . . . . . . . . .           7
             Redemption Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
                                                                                                       


                                             -i-
   4



                                                                                                    PAGE
                                                                                                    ----
                                                                                                 
             Redemption Price . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           7
             Registered Security  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Regular Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Responsible Officer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Security Register and Security Registrar . . . . . . . . . . . . . . . . . . .           8
             Significant Subsidiary   . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Special Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Stated Maturity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Subsidiary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Support Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           8
             Support Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           9
             Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           9
             Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           9
             U.S. Depositary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           9
             U.S. Government Obligations  . . . . . . . . . . . . . . . . . . . . . . . . .           9
             Utility  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           10
             Value  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           10
             Vice President . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           10
     SECTION 102.     Compliance Certificates and Opinions. . . . . . . . . . . . . . . . .           10
     SECTION 103.     Form of Documents Delivered to Trustee. . . . . . . . . . . . . . . .           11
     SECTION 104.     Acts of Holders . . . . . . . . . . . . . . . . . . . . . . . . . . .           11
     SECTION 105.     Notices, Etc., to Trustee, Company and
                         MCN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           13
     SECTION 106.     Notice to Holders; Waiver.  . . . . . . . . . . . . . . . . . . . . .           14
     SECTION 107.     Conflict with Trust Indenture Act.  . . . . . . . . . . . . . . . . .           14
     SECTION 108.     Effect of Headings and Table of
                         Contents.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           14
     SECTION 109.     Successors and Assigns. . . . . . . . . . . . . . . . . . . . . . . .           15
     SECTION 110.     Separability Clause.  . . . . . . . . . . . . . . . . . . . . . . . .           15
     SECTION 111.     Benefits of Indenture . . . . . . . . . . . . . . . . . . . . . . . .           15
     SECTION 112.     Governing Law . . . . . . . . . . . . . . . . . . . . . . . . . . . .           15
     SECTION 113.     Legal Holidays. . . . . . . . . . . . . . . . . . . . . . . . . . . .           15
     SECTION 114.     No Recourse Against Others. . . . . . . . . . . . . . . . . . . . . .           15

                                           ARTICLE TWO

                                         Security Forms

     SECTION 201.     Forms Generally   . . . . . . . . . . . . . . . . . . . . . . . . . .           16
     SECTION 202.     Form of Face of Security  . . . . . . . . . . . . . . . . . . . . . .           16
     SECTION 203.     Form of Reverse of Security . . . . . . . . . . . . . . . . . . . . .           18
     SECTION 204.     Form of Trustee's Certificate of
                           Authentication . . . . . . . . . . . . . . . . . . . . . . . . .           23
     SECTION 205.     Securities in Global Form . . . . . . . . . . . . . . . . . . . . . .           24
     SECTION 206.     CUSIP Number  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           25
     SECTION 207.     Form of Legend for the Securities in
                        Global Form . . . . . . . . . . . . . . . . . . . . . . . . . . . .           25
                                                                                                        



                                         -ii-

   5


                                 ARTICLE THREE

                    The Securities and the Support Agreement



                                                                                                     PAGE
                                                                                                     ----
                                                                                              
     SECTION 301.     Amount Unlimited; Issuable in Series  . . . . . . . . . . . . . . . .            25
     SECTION 302.     Denominations   . . . . . . . . . . . . . . . . . . . . . . . . . . .            28
     SECTION 303.     Execution, Authentication, Delivery
                        and Dating  . . . . . . . . . . . . . . . . . . . . . . . . . . . .            28
     SECTION 304.     Temporary Securities  . . . . . . . . . . . . . . . . . . . . . . . .            31
     SECTION 305.     Registration, Registration of Transfer
                        and Exchange  . . . . . . . . . . . . . . . . . . . . . . . . . . .            32
     SECTION 306.     Mutilated, Destroyed, Lost and Stolen
                        Securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . .            34
     SECTION 307.     Payment of Interest; Interest Rights
                        Preserved   . . . . . . . . . . . . . . . . . . . . . . . . . . . .            35
     SECTION 308.     Persons Deemed Owners   . . . . . . . . . . . . . . . . . . . . . . .            36
     SECTION 309.     Cancellation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .            37
     SECTION 310.     Computation of Interest   . . . . . . . . . . . . . . . . . . . . . .            37
     SECTION 311.     Support Agreement   . . . . . . . . . . . . . . . . . . . . . . . . .            37

                                          ARTICLE FOUR

                                    Satisfaction and Discharge

     SECTION 401.     Satisfaction and Discharge of Indenture   . . . . . . . . . . . . . .            37
     SECTION 402.     Application of Trust Money  . . . . . . . . . . . . . . . . . . . . .            38

                                          ARTICLE FIVE

                                            Remedies

     SECTION 501.     Events of Default   . . . . . . . . . . . . . . . . . . . . . . . . .            39
     SECTION 502.     Acceleration of Maturity; Rescission and
                        Annulment   . . . . . . . . . . . . . . . . . . . . . . . . . . . .            41
     SECTION 503.     Collection of Indebtedness and Suits for
                        Enforcement by Trustee  . . . . . . . . . . . . . . . . . . . . . .            42
     SECTION 504.     Trustee May File Proofs of Claim  . . . . . . . . . . . . . . . . . .            43
     SECTION 505.     Trustee May Enforce Claims Without
                        Possession of Securities  . . . . . . . . . . . . . . . . . . . . .            44
     SECTION 506.     Application of Money Collected  . . . . . . . . . . . . . . . . . . .            44
     SECTION 507.     Limitation on Suits   . . . . . . . . . . . . . . . . . . . . . . . .            44
     SECTION 508.     Unconditional Right of Holders to
                        Receive Principal, Premium and
                        Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            45
     SECTION 509.     Restoration of Rights and Remedies  . . . . . . . . . . . . . . . . .            45
     SECTION 510.     Rights and Remedies Cumulative  . . . . . . . . . . . . . . . . . . .            46
     SECTION 511.     Delay or Omission Not Waiver  . . . . . . . . . . . . . . . . . . . .            46
     SECTION 512.     Control by Holders  . . . . . . . . . . . . . . . . . . . . . . . . .            46
     SECTION 513.     Waiver of Past Defaults   . . . . . . . . . . . . . . . . . . . . . .            47
     SECTION 514.     Undertaking for Costs   . . . . . . . . . . . . . . . . . . . . . . .            47
                                                                                                         


                                           iii
   6
                                  ARTICLE SIX

                                  The Trustee



                                                                                                    PAGE
                                                                                                    ----
                                                                                                
     SECTION 601.     Certain Duties and Responsibilities of
                        the Trustee   . . . . . . . . . . . . . . . . . . . . . . . . . . .           48
     SECTION 602.     Notice of Defaults  . . . . . . . . . . . . . . . . . . . . . . . . .           48
     SECTION 603.     Certain Rights of Trustee   . . . . . . . . . . . . . . . . . . . . .           48
     SECTION 604.     Not Responsible for Recitals or Issuance
                        of Securities   . . . . . . . . . . . . . . . . . . . . . . . . . .           50
     SECTION 605.     May Hold Securities   . . . . . . . . . . . . . . . . . . . . . . . .           50
     SECTION 606.     Money Held in Trust   . . . . . . . . . . . . . . . . . . . . . . . .           50
     SECTION 607.     Compensation and Reimbursement  . . . . . . . . . . . . . . . . . . .           50
     SECTION 608.     Disqualification; Conflicting Interests   . . . . . . . . . . . . . .           51
     SECTION 609.     Corporate Trustee Required; Eligibility   . . . . . . . . . . . . . .           51
     SECTION 610.     Resignation and Removal; Appointment of
                         Successor  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           52
     SECTION 611.     Acceptance of Appointment by Successor  . . . . . . . . . . . . . . .           53
     SECTION 612.     Merger, Conversion, Consolidation or
                        Succession to Business  . . . . . . . . . . . . . . . . . . . . . .           55
     SECTION 613.     Preferential Collection of Claims
                        Against Company   . . . . . . . . . . . . . . . . . . . . . . . . .           55
     SECTION 614.     Appointment of Authenticating Agent   . . . . . . . . . . . . . . . .           55

                                              ARTICLE SEVEN

                             Holders' Lists And Reports By Trustee And Company

     SECTION 701.     Company to Furnish Trustee Names and
                        Addresses of Holders  . . . . . . . . . . . . . . . . . . . . . . .           57
     SECTION 702.     Preservation of Information;
                        Communications to Holders   . . . . . . . . . . . . . . . . . . . .           57
     SECTION 703.     Reports by Trustee  . . . . . . . . . . . . . . . . . . . . . . . . .           59
     SECTION 704.     Reports by Company  . . . . . . . . . . . . . . . . . . . . . . . . .           59

                                               ARTICLE EIGHT

                                Consolidation, Merger, Lease, Sale or Transfer

     SECTION 801.     When Company and MCN May Merge, Etc.  . . . . . . . . . . . . . . . .           60
     SECTION 802.     Opinion of Counsel  . . . . . . . . . . . . . . . . . . . . . . . . .           61
     SECTION 803.     Successor Corporation Substituted   . . . . . . . . . . . . . . . . .           61

                                                 ARTICLE NINE

                                            Supplemental Indentures

     SECTION 901.     Supplemental Indentures Without Consent
                        of Holders  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           62
                                                                                                        

                                                -iv-

   7




                                                                                                    PAGE
                                                                                                    -----
                                                                                              
     SECTION 902.     Supplemental Indentures with Consent
                        of Holders  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           63
     SECTION 903.     Execution of Supplemental Indentures  . . . . . . . . . . . . . . . .           64
     SECTION 904.     Effect of Supplemental Indentures . . . . . . . . . . . . . . . . . .           65
     SECTION 905.     Conformity with Trust Indenture Act . . . . . . . . . . . . . . . . .           65
     SECTION 906.     Reference in Securities to Supplemental
                        Indentures  . . . . . . . . . . . . . . . . . . . . . . . . . . . .           65

                                                  ARTICLE TEN

                                                   Covenants

     SECTION 1001.    Payments of Securities  . . . . . . . . . . . . . . . . . . . . . . .           65
     SECTION 1002.    Maintenance of Office or Agency . . . . . . . . . . . . . . . . . . .           66
     SECTION 1003.    Corporate Existence . . . . . . . . . . . . . . . . . . . . . . . . .           66
     SECTION 1004.    Payment of Taxes and Other Claims . . . . . . . . . . . . . . . . . .           67
     SECTION 1005.    Maintenance of Properties . . . . . . . . . . . . . . . . . . . . . .           67
     SECTION 1006.    Compliance Certificates . . . . . . . . . . . . . . . . . . . . . . .           68
     SECTION 1007.    Commission Reports  . . . . . . . . . . . . . . . . . . . . . . . . .           68
     SECTION 1008.    Waiver of Stay, Extension or Usury Laws . . . . . . . . . . . . . . .           69
     SECTION 1009.    Money for Securities Payments to Be
                        Held in Trust . . . . . . . . . . . . . . . . . . . . . . . . . . .           70
     SECTION 1010.    Limitation on Liens   . . . . . . . . . . . . . . . . . . . . . . . .           71
     SECTION 1011.    Limitation on Sale and Leaseback
                        Transactions  . . . . . . . . . . . . . . . . . . . . . . . . . . .           73
     SECTION 1012.    Waiver of Certain Covenants . . . . . . . . . . . . . . . . . . . . .           73
     SECTION 1013.    Support Agreement . . . . . . . . . . . . . . . . . . . . . . . . . .           74

                                               ARTICLE ELEVEN

                                           Redemption of Securities

     SECTION 1101.    Applicability of Article  . . . . . . . . . . . . . . . . . . . . . .           74
     SECTION 1102.    Election to Redeem; Notice to Trustee . . . . . . . . . . . . . . . .           74
     SECTION 1103.    Selection by Trustee of Securities
                        to Be Redeemed  . . . . . . . . . . . . . . . . . . . . . . . . . .           74
     SECTION 1104.    Notice of Redemption  . . . . . . . . . . . . . . . . . . . . . . . .           75
     SECTION 1105.    Deposit of Redemption Price . . . . . . . . . . . . . . . . . . . . .           76
     SECTION 1106.    Securities Payable on Redemption Date . . . . . . . . . . . . . . . .           76
     SECTION 1107.    Securities Redeemed in Part . . . . . . . . . . . . . . . . . . . . .           77

                                               ARTICLE TWELVE

                                               Sinking Funds

     SECTION 1201.    Applicability of Article  . . . . . . . . . . . . . . . . . . . . . .           77
     SECTION 1202.    Satisfaction of Sinking Fund Payments
                        with Securities . . . . . . . . . . . . . . . . . . . . . . . . . .           78
     SECTION 1203.    Redemption of Securities for Sinking
                        Fund  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           78
                                                                                                         


                                                -v-
   8





                                                                                                     PAGE
                                                                                                     ----
                                                                                               
                                ARTICLE THIRTEEN

                       Defeasance and Covenant Defeasance

     SECTION 1301.    Applicability of Article; Company's
                        Option to Effect Defeasance or
                        Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . .            78
     SECTION 1302.    Defeasance and Discharge  . . . . . . . . . . . . . . . . . . . . . .            79
     SECTION 1303.    Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . . .            79
     SECTION 1304.    Conditions to Defeasance or Covenant
                        Defeasance  . . . . . . . . . . . . . . . . . . . . . . . . . . . .            80
     SECTION 1305.    Deposited Money and Government
                        Obligations To Be Held In Trust . . . . . . . . . . . . . . . . . .            82

                                               ARTICLE FOURTEEN

                                                 Miscellaneous

     SECTION 1401.    Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . .            83
                                                                                                         


                                        -vi-
   9

          INDENTURE, dated as of September 1, 1995, between MCN INVESTMENT
CORPORATION, a corporation duly organized and existing under the laws of the
State of Michigan (herein called the "COMPANY"), having its principal office at
150 West Jefferson Ave., Suite 1800, Detroit, Michigan 48226, and NBD Bank, as
Trustee (herein called the "TRUSTEE").

                            RECITALS OF THE COMPANY

          The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"SECURITIES"), to be issued in one or more series as in this Indenture
provided.

          The Company and MCN Corporation, a Michigan corporation and the
parent of the Company ("MCN"), have entered into a Support Agreement, dated as
of September 1, 1995 (as such Support Agreement may be hereafter amended,
modified or supplemented from time to time in accordance with its terms and the
provisions of this Indenture, the "Support Agreement"), a copy of which is
attached as Exhibit A hereto, pursuant to which MCN has agreed to ensure the
timely payment of principal of and premium, if any, and interest on Debt (as
defined in the Support Agreement) and to comply with all covenants and other
terms of this Indenture; provided, that, no holder of such Debt shall have
recourse against the stock or assets of Michigan Consolidated Gas Company, a
Michigan corporation ("MichCon"), or any interest of the Company or MCN
therein.

          All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

          NOW, THEREFORE, THIS INDENTURE WITNESSETH:

          For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually covenanted and agreed, for
the equal and proportionate benefit of all Holders of the Securities or of
series thereof, as follows:



                                  ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 101.  Definitions.

          For all purposes of this Indenture, except as otherwise expressly
provided or unless the context otherwise requires:

          (1)  the terms defined in this Article have the meanings assigned to
     them in this Article and include the plural as well as the singular;





   10

          (2)  all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3)  all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with GAAP;

          (4)  the word "INCLUDING" (and with correlative meaning "INCLUDE")
     means including, without limiting the generality of, any description
     preceding such term;

          (5)  the words "HEREIN," "HEREOF" and "HEREUNDER" and other words of
     similar import refer to this Indenture as a whole and not to any
     particular Article, Section or other subdivision; and

          (6)  the word "or" is always used inclusively (for example, the
     phrase "A or B" means "A or B or both," not "either A or B but not both").

     Certain terms, used principally in Article Six, are defined in that
     Article.

          "ACT," when used with respect to any Holder, has the meaning
specified in Section 104.

          "AFFILIATE" of any specified Person means any other Person directly
or indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

          "AUTHENTICATING AGENT" means any Person authorized by the Trustee to
act on behalf of the Trustee to authenticate Securities.

          "BANKRUPTCY LAW" means Title 11, U.S. Code or any similar federal or
state law for the relief of debtors.

          "BOARD OF DIRECTORS" means the board of directors of the Company or
MCN, as the case may be; provided, however, that when the context refers to
actions or resolutions of the Board of Directors, then the term "Board of
Directors" shall also mean any duly authorized committee of the Board of
Directors of the Company or MCN, as the case may be or Officer authorized to
act with respect to any particular matter to exercise the power of the Board of
Directors of the Company or MCN, as the case may be.

          "BOARD RESOLUTION" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the



                                      -2-
   11

Company or MCN, as the case may be to have been duly adopted by the Board of
Directors and to be in full force and effect on the date of such certification,
and delivered to the Trustee.

          "BUSINESS DAY," when used with respect to any Place of Payment, means
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on
which banking institutions in that Place of Payment are authorized or obligated
by law or regulation to close.

          "CAPITALIZED LEASE OBLIGATION" means an obligation under a lease that
is required to be capitalized for financial reporting purposes in accordance
with GAAP, and the amount of Indebtedness represented by such obligation shall
be the capitalized amount of such obligations determined in accordance with
such principles.

          "CAPITAL STOCK" of any Person shall mean any and all shares,
interests, participations or other equivalents of or interests in (however
designated) equity of such Person, including any preferred stock, but excluding
any debt securities convertible into such equity.

          "COMMISSION" means the Securities and Exchange Commission, as from
time to time constituted, created under the Exchange Act, or, if at any time
after the execution of this instrument such Commission is not existing and
performing the duties now assigned to it under the Trust Indenture Act, then
the body performing such duties at such time.

          "COMMON DEPOSITARY" has the meaning specified in Section 304.

          "COMPANY" means the Person named as the "Company" in the first
paragraph of this Indenture until a successor corporation shall have become
such pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor corporation.

          "COMPANY REQUEST" or "COMPANY ORDER" means a written request or order
signed in the name of the Company by its Chairman of the Board, its President,
its Vice Chairman of the Board, its Chief Financial Officer or a Vice
President, and by its Treasurer, an Assistant Treasurer, its Controller, an
Assistant Controller, its Secretary or an Assistant Secretary, and delivered to
the Trustee.

          "CORPORATE TRUST OFFICE" means the office of the Trustee in Detroit,
Michigan at which at any particular time its corporate trust business shall be
principally administered, which office at the date hereof is located at 611
Woodward Avenue, 11th Floor-North, Detroit, MI 48226.



                                      -3-
   12

          "COVENANT DEFEASANCE" has the meaning specified in Section 1303.

          "CUSTODIAN" means any receiver, trustee, assignee, liquidator,
sequestrator or similar official under any Bankruptcy Law.

          "DEFAULT" means any event which is, or after notice or passage of
time or both would be, an Event of Default.

          "DEFAULTED INTEREST" has the meaning specified in Section 307.

          "DEFEASANCE" has the meaning specified in Section 1302.

          "DOLLARS" and "$" means lawful money of the United States of America.

          "EVENT OF DEFAULT" has the meaning specified in Section 501.

          "EXCHANGE ACT" means the Securities and Exchange Act of 1934, as
amended from time to time, and the rules and regulations promulgated
thereunder.

          "HOLDER" or "SECURITYHOLDER" means a Person in whose name a Security
is registered in the Security Register.

          "INDEBTEDNESS" of any Person means, without duplication, (i) the
principal of and premium (if any) in respect of (A) indebtedness of such Person
for money borrowed and (B) indebtedness evidenced by notes, debentures, bonds
or other similar instruments for the payment of which such Person is
responsible or liable; (ii) all Capitalized Lease Obligations of such Person;
(iii) all obligations of such Person issued or assumed as the deferred purchase
price of property, all conditional sale obligations and all obligations under
any title retention agreement (but excluding trade accounts payable arising in
the ordinary course of business); (iv) all obligations of such Person for the
reimbursement of any obligor on any letter of credit, banker's acceptance or
similar credit transaction (other than obligations with respect to letters of
credit securing obligations (other than obligations described in (i) through
(iii) above) entered into in the ordinary course of business of such Person to
the extent such letters of credit are not drawn upon or, if and to the extent
drawn upon, such drawing is reimbursed no later than the third Business Day
following receipt by such Person of a demand for reimbursement following
payment on the letter of credit); (v) all obligations of the type referred to
in clauses (i) through (iv) of other Persons and all dividends of other Persons
for the payment of which, in either case, such Person is responsible or liable
as obligor, guarantor or otherwise; and (vi) all obligations of the type
referred to in clauses (i) through (v) of other Persons secured by any Lien on


                                      -4-
   13

any property or asset of such Person (whether or not such obligation is assumed
by such Person), the amount of such obligation being deemed to be the lesser of
the value of such property or assets or the amount of the obligation so
secured.

          "INDENTURE" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof
and shall include the terms of particular series of Securities established as
contemplated by Section 301.

          "INTEREST," when used with respect to an Original Issue Discount
Security which by its terms bears interest only after Maturity, means interest
payable after Maturity.

          "INTEREST PAYMENT DATE," when used with respect to any Security,
means the Stated Maturity of an installment of interest on such Security.

          "LIEN," means any lien (statutory or other), mortgage, pledge,
hypothecation, assignment, deposit arrangement, encumbrance or preference,
priority or other security agreement or preferential arrangement of any kind or
nature whatsoever (including, without limitation, the interest of a vendor or
lessor under any conditional sale, capitalized lease or other title retention
agreement).

          "MATURITY," when used with respect to any Security, means the date on
which the principal of such Security or an installment of principal becomes due
and payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

          "MCN" means the Person named as "MCN" in the second recital of this
Indenture until a successor corporation shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "MCN" shall mean such
successor corporation.

          "OFFICER" means the Chairman of the Board of Directors, the Vice
Chairman of the Board of Directors, the President, Chief Financial Officer, any
Vice President, the Treasurer, any Assistant Treasurer, the Controller, the
Secretary or any Assistant Secretary of the Company or MCN, as the case may be.

          "OFFICER'S CERTIFICATE" means a certificate signed by an Officer and
delivered to the Trustee.

          "OPINION OF COUNSEL" means a written opinion of counsel, who may be
an employee of or counsel for the Company or MCN, as the case may be, and who
shall be reasonably acceptable to the Trustee.


                                      -5-
   14

           "ORIGINAL ISSUE DISCOUNT SECURITY" means any Security which provides
for an amount less than the principal amount thereof to be due and payable upon
a declaration of acceleration of the Maturity thereof pursuant to Section 502.

           "OUTSTANDING," when used with respect to Securities or Securities of
any series, means, as of the date of determination, all such Securities
theretofore authenticated and delivered under this Indenture, except:

           (i)  Securities theretofore cancelled by the Trustee or delivered to
     the Trustee for cancellation;

           (ii)  Securities, or portions thereof, for whose payment or
     redemption money in the necessary amount has been theretofore deposited
     with the Trustee or any Paying Agent (other than the Company) in trust or
     set aside and segregated in trust by the Company (if the Company shall act
     as its own Paying Agent) for the Holders of such Securities; provided
     that, if such Securities are to be redeemed, notice of such redemption has
     been duly given pursuant to this Indenture or provision therefor
     satisfactory to the Trustee has been made;

           (iii)  Securities which have been paid pursuant to Section 306 or in
     exchange for or in lieu of which other Securities have been authenticated
     and delivered pursuant to this Indenture, other than any such Securities
     in respect of which there shall have been presented to the Trustee proof
     satisfactory to it that such Securities are held by a bona fide purchaser
     in whose hands such Securities are valid obligations of the Company; and

           (iv)  Securities which have been defeased pursuant to Section 1302;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder, (a) the
principal amount of an Original Issue Discount Security that shall be deemed to
be Outstanding for such purposes shall be that portion of the principal amount
thereof that could be declared to be due and payable upon the occurrence of an
Event of Default and the continuation thereof pursuant to the terms of such
Original Issue Discount Security as of the date of such determination and (b)
Securities owned by the Company or any other obligor upon the Securities or any
Affiliate of the Company or of such other obligor shall be disregarded and
deemed not to be Outstanding, except that, in determining whether the Trustee
shall be protected in relying upon any such request, demand, authorization,
direction, notice, consent or waiver, only Securities which the Trustee knows
to be so owned shall be so disregarded.  Securities so owned which have been
pledged in good


                                      -6-
   15

faith may be regarded as Outstanding if the pledgee establishes to the
satisfaction of the Trustee the pledgee's right so to act with respect to such
Securities and that the pledgee is not the Company or any other obligor upon
the Securities or any Affiliate of the Company or of such other obligor.

           "PAYING AGENT" means any Person authorized by the Company to pay the
principal of (and premium, if any) or interest on any Securities on behalf of
the Company.  The Company may act as Paying Agent with respect to any
Securities issued hereunder.

           "PERSON" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization
or government or any agency or political subdivision thereof.

           "PLACE OF PAYMENT," when used with respect to the Securities of any
series, means the place or places where the principal of (and premium, if any)
and interest on the Securities of that series are payable as specified as
contemplated by Section 301.


           "PROJECT FINANCE INDEBTEDNESS" means Indebtedness of a Subsidiary
(other than a Utility and other than the Company) secured by a Lien on any      
property, acquired, constructed or improved by such Subsidiary after the date
of this Indenture which Lien is created or assumed contemporaneously with, or
within 120 days after, such acquisition or completion of such construction or
improvement, or within six months thereafter pursuant to a firm commitment for
financing arranged with a lender or investor within such 120-day period, to
secure or provide for the payment of all or any part of the purchase price of
such property or the cost of such construction or improvement or on any
property existing at the time of acquisition thereof; provided that such a Lien
shall not apply to any property theretofore owned by any such Subsidiary other
than, in the case of any such construction or improvement, any theretofore
unimproved real property on which the property so constructed or the
improvement is located; and provided further that such Indebtedness, by its
terms, shall limit the recourse of any holder of such Indebtedness (or trustee
on such holder's behalf) in the event of any default in such Indebtedness to
the assets subject to such Liens and the capital stock of the Subsidiary
issuing such Indebtedness.  Notwithstanding the foregoing, Project Finance 
Indebtedness shall include all Indebtedness that would constitute Project
Finance Indebtedness but for the fact that such Indebtedness was issued prior
to the date of this Indenture and taking into account the fact that the
property subject to the Lien may have been acquired prior to the date of this
Indenture.

           "REDEMPTION DATE," when used with respect to any Security of any
series to be redeemed, means the date fixed for such redemption by or pursuant
to this Indenture.

           "REDEMPTION PRICE," when used with respect to any Security of any
series to be redeemed, means the price at which it is to be redeemed pursuant
to this Indenture.


                                      -7-
   16

           "REGISTERED SECURITY" means any Security issued hereunder and
registered in the Security Register.

           "REGULAR RECORD DATE" for the interest payable on any Interest
Payment Date on the Securities of any series means the date specified for that
purpose as contemplated by Section 301.

           "RESPONSIBLE OFFICER," when used with respect to the Trustee, means
any officer of the Trustee in its Corporate Trust Offices and also means, with
respect to a particular corporate trust matter, any other officer to whom such
matter is referred because of his knowledge of and familiarity with the
particular subject.

           "SECURITIES" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and
delivered under this Indenture.

           "SECURITY REGISTER" and "SECURITY REGISTRAR" have the respective
meanings specified in Section 305.

           "SIGNIFICANT SUBSIDIARY" means a Subsidiary or Subsidiaries of MCN
possessing assets (including the assets of its own Subsidiaries but without
regard to MCN or any other Subsidiary) having a book value, determined as of
the most recent past year end, in the aggregate, equal to not less than 10% of
the book value of the aggregate assets of MCN and its Subsidiaries calculated
on a consolidated basis.

           "SPECIAL RECORD DATE" for the payment of any Defaulted Interest
means a date fixed by the Trustee pursuant to Section 307.

           "STATED MATURITY," when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such installment of principal or interest is due and payable.

           "SUBSIDIARY" of a Person means (i) any corporation more than 50% of
the outstanding securities having ordinary voting power of which shall at the
time be owned or controlled, directly or indirectly, by such Person or by one
or more of its Subsidiaries or by such Person and one or more of its
Subsidiaries, or (ii) any partnership, association, joint venture or similar
business organization more than 50% of the ownership interests having ordinary
voting power of which shall at the time be so owned or controlled.  Unless
otherwise expressly provided, all references herein to a "Subsidiary" shall
mean a Subsidiary of the Company or MCN.

   "SUPPORT AGREEMENT" has the meaning stated in the second recital of this
Indenture.


                                      -8-
   17

           "SUPPORT OBLIGATIONS" means the obligations of MCN under the Support
Agreement.

           "TRUST INDENTURE ACT" means the Trust Indenture Act of 1939, as
amended, as in force at the date as of which this Indenture was executed;
provided, however, that in the event that such Act is amended after such date,
"TRUST INDENTURE ACT" means the Trust Indenture Act of 1939 as so amended.

           "TRUSTEE" means the Person named as the "Trustee" in the first
paragraph of this instrument until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder,
and if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

           "U.S. DEPOSITARY" means, with respect to the Securities of any
series issuable or issued in whole or in part in the form of one or more
permanent global Securities, the Person designated as U.S. Depositary by the
Company pursuant to Section 301, which must be a clearing agency registered
under the Exchange Act until a successor U.S. Depositary shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter "U.S.
Depositary" shall mean or include each Person who is then a U.S. Depositary
hereunder, and if at any time there is more than one such Person, "U.S.
Depositary" shall mean the U.S. Depositary with respect to the Securities of
that series.

           "U.S. GOVERNMENT OBLIGATIONS" means securities which are (i) direct
obligations of the United States of America for the payment of which its full
faith and credit is pledged or (ii) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States
of America the timely payment of which is unconditionally guaranteed by the
full faith and credit of the United States of America which, in either case,
are not callable or redeemable at the option of the issuer thereof or otherwise
subject to prepayment, and shall also include a depository receipt issued by a
New York Clearing House bank or trust company as custodian with respect to any
such U.S. Government Obligation or a specific payment or interest on or
principal of any such U.S. Government Obligation held by such custodian for the
account of the holder of a depository receipt, provided that (except as
required by law) such custodian is not authorized to make any deduction from
the amount payable to the holder of such depository receipt or from any amount
held by the custodian in respect of the U.S. Government Obligation or the
specific payment of interest on or principal of the U.S. Government Obligation
evidenced by such depository receipt.


                                      -9-
   18

           "UTILITY" shall mean any Subsidiary of MCN or the Company engaged in
the business of distributing natural gas at retail.

           "VALUE" means, with respect to a Sale and Leaseback Transaction, as
of any particular time, the amount equal to the greater of (i) the net proceeds
of the sale and transfer of the real property leased pursuant to such Sale and
Leaseback Transaction or (ii) the fair market value, in the good faith opinion
of the Board of Directors of the Company or MCN, as the case may be, of such
real property at the time of entering into such Sale and Leaseback transaction,
in either case divided first by the number of full years of the term of the
lease and then multiplied by the number of full years of such term remaining at
the time of determination, without regard to any renewal or extension options
contained in the lease.

           "VICE PRESIDENT," when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".

SECTION 102.      Compliance Certificates and Opinions.

           Upon any application or request by the Company or MCN, as the case
may be, to the Trustee to take any action under any provision of this
Indenture, other than as action permitted by Sections 205 and 704 hereof, the
Company or MCN, as the case may be, shall furnish to the Trustee an Officer's
Certificate stating that all conditions precedent, if any, provided for in this
Indenture relating to the proposed action have been complied with and an
Opinion of Counsel stating that in the opinion of such counsel all such
conditions precedent, if any, have been complied with, except that in the case
of any such application or request as to which the furnishing of such documents
is specifically required by any provision of this Indenture relating to such
particular application or request, no additional certificate or opinion need be
furnished.

           Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include:

                  a.     a statement that each individual signing such
           certificate or opinion has read such covenant or condition and the
           definitions herein relating thereto;

                  b.     a brief statement as to the nature and scope of the
           examination or investigation upon which the statements or opinions
           contained in such certificate or opinion are based;

                  c.     a statement that, in the opinion of each such
           individual, he has made such examination or





                                      -10-
   19

     investigation as is necessary to enable him to express an informed opinion
     as to whether or not such covenant or condition has been complied with;
     and

                  d.     a statement as to whether, in the opinion of each such
     individual, such condition or covenant has been complied with.

SECTION 103.      Form of Documents Delivered to Trustee.

           In any case where several matters are required to be certified by,
or covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

           Any certificate or opinion of an Officer may be based, insofar as it
relates to legal matters, upon a certificate or opinion of, or representations
by, counsel, unless such Officer knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
the matters upon which his certificate or opinion is based are erroneous.  Any
such certificate or Opinion of Counsel may be based, insofar as it relates to
factual matters, upon a certificate or opinion of, or representations by, an
Officer or Officers of the Company or MCN, as the case may be, stating that the
information with respect to such factual matters is in the possession of the
Company or MCN, as the case may be, unless such counsel knows, or in the
exercise of reasonable care should know, that the certificate or opinion or
representations with respect to such matters are erroneous.

           Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

SECTION 104.      Acts of Holders.

     (a)   Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by agents duly
appointed in writing; and, except as herein otherwise expressly provided, such
action shall become effective when such instrument or instruments are received
by the Trustee and, where it is hereby expressly required, to the Company.
Such instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "ACT" of the Holders signing
such instrument or



                                      -11-
   20

instruments.  Proof of execution of any such instrument or of a writing
appointing any such agent shall be sufficient for any purpose of this Indenture
and (subject to Section 601) conclusive in favor of the Trustee and the
Company, if made in the manner provided in this Section.

     (b)   Without limiting the generality of this Section 104, unless
otherwise provided in or pursuant to this Indenture, a Holder, including a U.S.
Depositary that is a Holder of a global Security, may make, give or take, by a
proxy or proxies duly appointed in writing, any request, demand, authorization,
direction, notice, consent, waiver or other action provided in or pursuant to
this Indenture to be made, given or taken by Holders, and a U.S. Depositary
that is a Holder of a global Security may give its proxy or proxies to the U.S.
Depositary's participants or the beneficial owners of interests in any such
global Security, as the case may be, through such U.S. Depositary's standing
instructions and customary practices.

     (c)   The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof.  Where
such execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority.  The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Trustee deems sufficient.

     (d)   The ownership of Registered Securities shall be proved by the
Security Register.

     (e)   Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Security shall bind every future
Holder of the same Security and the Holder of every Security issued upon the
registration of transfer thereof or in exchange therefor or in lieu thereof in
respect of anything done, omitted or suffered to be done by the Trustee or the
Company in reliance thereon, whether or not notation of such action is made
upon such Security.

     (f)   Subject to the next succeeding paragraph, if the Company shall
solicit from the Holders any request, demand, authorization, direction, notice,
consent, waiver or other Act, the Company may, at its option, by or pursuant to
a Board Resolution, fix in advance a record date for the determination of
Holders entitled to give such request, demand, authorization, direction,
notice, consent, waiver or other Act, but the Company shall have no obligation
to do so.  If such a record date is fixed, such request, demand, authorization,
direction, notice, consent, waiver or other Act may be given before or after
such



                                      -12-
   21

record date, but only the Holders of record at the close of business on such
record date shall be deemed to be Holders for the purposes of determining
whether Holders of the requisite proportion of Outstanding Securities have
authorized or agreed or consented to such request, demand, authorization,
direction, notice, consent, waiver or other Act, and for that purpose the
Outstanding Securities shall be computed as of such record date; provided that
no such authorization, agreement or consent by the Holders on such record date
shall be deemed effective unless it shall become effective pursuant to the
provisions of this Indenture not later than six months after the record date.

     (g)   The Company shall fix a record date for the purpose of determining
the Persons who are beneficial owners of interests in any permanent global
Security held by a U.S. Depositary and who are entitled under the procedures of
such U.S. Depositary to make, give or take, by a proxy or proxies duly
appointed in writing, any request, demand, authorization, direction, notice,
consent, waiver or other action provided in or pursuant to this Indenture to be
made, given or taken by Holders.  If such a record date is fixed, the Holders
on such record date or their duly appointed proxy or proxies, and only such
Persons, shall be entitled to make, give or take such request, demand,
authorization, direction, notice, consent, waiver or other action, whether or
not such Holders remain Holders after such record date.  No such request,
demand, authorization, direction, notice, consent, waiver or other action shall
be valid or effective if made, given or taken more than 90 days after such
record date.

SECTION 105.      Notices, Etc., to Trustee, Company and MCN.

     Any request, demand, authorization, direction, notice, consent, waiver or
Act of Holders or other document provided or permitted by this Indenture to be
made upon, given or furnished to, or filed with,

           a.     the Trustee by any Holder or by the Company or MCN shall be
     sufficient for every purpose hereunder if made, given, furnished or filed
     in writing to or with the Trustee and received by the Trustee at its
     Corporate Trust Office, or

           b.     the Company by the Trustee or by any Holder shall be
     sufficient for every purpose hereunder (unless otherwise herein expressly
     provided) if in writing and mailed, first-class postage prepaid, to the
     Company addressed to it at the address of its principal office specified
     in the first paragraph of this Indenture, attention:  Secretary, or at any
     other address previously furnished in writing to the Trustee by the
     Company.



                                      -13-
   22

SECTION 106.      Notice to Holders; Waiver.

           Where this Indenture or any Security provides for notice to Holders
of any event, such notice shall be deemed sufficiently given (unless otherwise
herein or in such Security expressly provided) if in writing and mailed,
first-class postage prepaid, to each Holder affected by such event, at his
address as it appears in the Security Register, not later than the latest date,
and not earlier than the earliest date, prescribed for the giving of such
notice.  In any case where notice to Holders is given by mail, neither the
failure to mail such notice, nor any defect in any notice so mailed, to any
particular Holder shall affect the sufficiency of such notice with respect to
other Holders or the validity of the proceedings to which such notice relates.
Where this Indenture or any Security provides for notice in any manner, such
notice may be waived in writing by the Person entitled to receive such notice,
either before or after the event, and such waiver shall be the equivalent of
such notice.  Waivers of notice by Holders shall be filed with the Trustee, but
such filing shall not be a condition precedent to the validity of any action
taken in reliance upon such waiver.

           In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by
mail, then such notification as shall be made with the approval of the Trustee
shall constitute a sufficient notification for every purpose hereunder.

           Any request, demand, authorization, direction, notice, consent or
waiver required or permitted under this Indenture shall be in the English
language, except that any published notice may be in an official language of
the country of publication.

SECTION 107.      Conflict with Trust Indenture Act.

           If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Indenture by any of
the provisions of the Trust Indenture Act, such required provision shall
control.  If any provision of this Indenture modifies or excludes any provision
of the Trust Indenture Act that may be so modified or excluded, the latter
provision shall be deemed to apply to this Indenture as so modified or shall be
excluded, as the case may be.

SECTION 108.      Effect of Headings and Table of Contents.

           The Article and Section headings herein and the Table of Contents
are for convenience only and shall not affect the construction hereof.


                                      -14-
   23

SECTION 109.      Successors and Assigns.

           All covenants and agreements in this Indenture by the Company and
MCN shall bind its successors and assigns, whether so expressed or not.

SECTION 110.      Separability Clause.

           In case any provision in this Indenture or in the Securities shall
be invalid, illegal or unenforceable, the validity, legality and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby.

SECTION 111.      Benefits of Indenture.

           Nothing in this Indenture or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their successors
hereunder and the Holders, any benefit or any legal or equitable right, remedy
or claim under this Indenture.

SECTION 112.      Governing Law.

           This Indenture and the Securities shall be governed by and construed
in accordance with the laws (other than the choice of law provisions) of the
State of New York.

SECTION 113.      Legal Holidays.

           In any case where any Interest Payment Date, Redemption Date or
Stated Maturity of any Security shall not be a Business Day at any Place of
Payment, then (notwithstanding any other provision of this Indenture or of the
Securities) payment of interest or principal (and premium, if any) need not be
made at such Place of Payment on such date, but may be made on the next
succeeding Business Day or on such other day as may be set out in the Officer's
Certificate pursuant to Section 301 at such Place of Payment with the same
force and effect as if made on the Interest Payment Date or Redemption Date, or
at the Stated Maturity, provided that no interest shall accrue for the period
from and after such Interest Payment Date, Redemption Date or Stated Maturity,
as the case may be.

SECTION 114.      No Recourse Against Others.

           A director, officer, employee or stockholder, as such, of the
Company or MCN shall not have any liability for any obligations of the Company
or MCN, as the case may be, under the Securities or this Indenture or for any
claim based on, in respect of or by reason of such obligations or their
creation.  Each Securityholder, by accepting a Security, waives and releases
all such liability.  Such waivers and releases are part of the consideration
for the issuance of the Securities.





                                      -15-
   24
                                  ARTICLE TWO

                                 SECURITY FORMS

SECTION 201.     Forms Generally.

        The Securities of each series shall be in substantially the form set
forth in this Article, or in such other form as shall be established by or
pursuant to a Board Resolution or in one or more indentures supplemental
hereto, in each case with such appropriate insertions, omissions, substitutions
and other variations as are required or permitted by this Indenture, and may
have such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or as may, consistently herewith, be determined by the
Officers executing such Securities, as evidenced by their execution of the
Securities.  If the form of Securities of any series is established by action
taken pursuant to a Board Resolution, a copy of an appropriate record of such
action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the Company
Order contemplated by Section 303 for the authentication and delivery of such
Securities.

        The Trustee's certificates of authentication shall be in substantially
the form set forth in this Article or Section 614.

                 The definitive Securities shall be photocopied, printed,
lithographed or engraved on steel engraved borders or may be produced in any
other manner, all as determined by the Officers executing such Securities, as
evidenced by their execution of such Securities.

SECTION 202.     Form of Face of Security.

        [If the Security is an Original Issue Discount Security, insert--FOR
PURPOSES OF SECTION 1272 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE
"CODE"), THE AMOUNT OF ORIGINAL ISSUE DISCOUNT (AS DEFINED IN SECTION
1273(a)(1) OF THE CODE AND TREASURY REGULATION SECTION 1.1273-1(a) WITH RESPECT
TO THIS SECURITY IS ________, THE ISSUE PRICE (AS DEFINED IN TREASURY
REGULATION SECTION 1.1273-2) OF THIS SECURITY IS __________,THE ISSUE DATE (AS
DEFINED IN SECTION 1275(a)(2) OF THE CODE AND TREASURY REGULATION SECTION
1.1273-2) OF THIS SECURITY IS _______ AND THE YIELD TO MATURITY OF THIS
SECURITY IS ________.

                                    -16-
   25

                           MCN INVESTMENT CORPORATION

                           .........................


No. _______
                                                                     [$]________

                 MCN INVESTMENT CORPORATION, a corporation duly organized and
existing under the laws of Michigan (herein called the "Company," which term
includes any successor corporation under the Indenture hereinafter referred
to), for value received, hereby promises to pay to _____________________, or
registered assigns, the principal sum of ____________________ [Dollars] on
__________________________ [If the Security is to bear interest prior to
Maturity, insert--, and to pay interest thereon from _______________________ or
from the most recent Interest Payment Date to which interest has been paid or
duly provided for, [semi-annually] [quarterly] [monthly] on _______ and
________ in each year, commencing _____________________, at the rate of _____%
per annum, until the principal hereof is paid or made available for payment [If
applicable insert--, and (to the extent that the payment of such interest
shall be legally enforceable) at the rate of _____% per annum on any overdue
principal and premium and on any overdue installment of interest].  The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date will, as provided in such Indenture, be paid to the Person in
whose name this Security (or one or more Predecessor Securities) is registered
at the close of business on the Regular Record Date for such interest, which
shall be the ____ of _____ (whether or not a Business Day), as the case may be,
next preceding such Interest Payment Date.  Any such interest not so punctually
paid or duly provided for will forthwith cease to be payable to the Holder on
such Regular Record Date and may either be paid to the Person in whose name
this Security (or one or more Predecessor Securities) is registered at the
close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders
of Securities of this series not less than 10 days prior to such Special Record
Date, or be paid at any time in any other lawful manner not inconsistent with
the requirements of any securities exchange on which the Securities of this
series may be listed, and upon such notice as may be required by such exchange,
all as more fully provided in said Indenture].

[If the Security is not to bear interest prior to Maturity, insert--The
principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal of this Security shall bear
interest at the rate of ___% per annum (to the extent that the payment of such
interest shall be legally enforceable), which shall accrue from the date of
such default in payment to the date payment of

                                    -17-
   26
such principal has been made or duly provided for.  Interest on any overdue
principal shall be payable on demand.  Any such interest on any overdue
principal that is not so paid on demand shall bear interest at the rate of
____% per annum (to the extent that the payment of such interest shall be
legally enforceable), which shall accrue from the date of such demand for
payment to the date payment of such interest has been made or duly provided
for, and such interest shall also be payable on demand.]

                 Payment of the principal of (and premium, if any) and [if
applicable, insert--any such] interest on this Security will be made at the
office or agency of the Company maintained for that purpose in _________, in
Dollars [if applicable, insert--; provided, however, that at the option of the
Company payment of interest may be made by check mailed to the address of the
Person entitled thereto as such address shall appear in the Security Register].

                 Reference is hereby made to the further provisions of this
Security set forth on the reverse hereof, which further provisions shall for
all purposes have the same effect as if set forth at this place.

                 Unless the certificate of authentication hereon has been
executed by the Trustee referred to on the reverse hereof by manual signature,
this Security shall not be entitled to any benefit under the Indenture or be
valid or obligatory for any purpose.

                 IN WITNESS WHEREOF, the Company has caused this instrument to
be duly executed under its corporate seal.



                                                  MCN INVESTMENT CORPORATION


                                                  By____________________________


Attest:


_________________________                                   [SEAL]

SECTION 203.     Form of Reverse of Security.

                 This Security is one of a duly authorized issue of securities
of the Company (herein called the "Securities"), issued and to be issued in one
or more series under an Indenture, dated as of ______________, 1995 (herein
called the "Indenture"), between the Company and
_______________________________________, as Trustee (herein called the
"Trustee," which term includes any successor trustee under the Indenture), to
which Indenture and

                                    -18-
   27

all indentures supplemental thereto reference is hereby made for a statement of
the respective rights, limitations of rights, duties and immunities thereunder
of the Company, the Trustee and the Holders of the Securities and of the terms
upon which the Securities are, and are to be, authenticated and delivered.
This Security is one of the series designated on the face hereof [, limited in
aggregate principal amount to $______].

                 [If applicable, insert -- The Securities of this series are
subject to redemption upon not less than 30 nor more than 45 days' notice by
first class mail, [if applicable, insert--(1) on _______ in any year commencing
with the year _______ and ending with the year _____ through operation of the
sinking fund for this series at a Redemption Price equal to 100% of the
principal amount, and (2)] at any time [on or after __________, _________], as
a whole or in part, at the election of the Company, at the following Redemption
Prices (expressed as percentages of the principal amount):

                 If redeemed [on or before _______________, ____%, and if
redeemed] during the 12-month period beginning _____________ of the years
indicated,



               Redemption                   Redemption
        Year     Price           Year          Price  
        ----  ----------         ----       ----------
                                   






and thereafter at a Redemption Price equal to _____% of the principal amount,
together in the case of any such redemption [if applicable, insert -- (whether
through operation of the sinking fund or otherwise)] with accrued and unpaid
interest to the Redemption Date, but interest installments whose Stated
Maturity is on or prior to such Redemption Date will be payable to the Holders
of such Securities, or one or more Predecessor Securities, of record at the
close of business on the relevant Record Dates referred to on the face hereof,
all as provided in the Indenture.]

                 [If applicable, insert -- The Securities of this series are
subject to redemption upon not less than 30 nor more than 45 days' notice by
first class mail, (1) on _____________ in any year commencing with the year
___________ and ending with the year ______ through operation of the sinking
fund for this series at the Redemption Prices for redemption through operation
of the sinking fund (expressed as percentages of the principal amount) set
forth in the table below, and (2) at any time [on or after ________], as a
whole or in part, at the election of the Company, at the Redemption Prices for
redemption otherwise than through

                                    -19-
   28

operation of the sinking fund (expressed as percentages of the principal
amount) set forth in the table below:


                 If redeemed during a 12-month period beginning
_________________ of the years indicated,



                 Redemption Price
                  For Redemption                            Redemption Price for
                 Through Operation                          Redemption Otherwise
                      of the                                Than Through Operation
Year                Sinking Fund                             of the Sinking Fund  
- ----             -----------------                          ----------------------
                                                      






and thereafter at a Redemption Price equal to __% of the principal amount,
together in the case of any such redemption (whether through operation of the
sinking fund or otherwise) with accrued and unpaid interest to the Redemption
Date, but interest installments whose Stated Maturity is on or prior to such
Redemption Date will be payable to the Holders of such Securities, or one or
more Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture.]

                 [Notwithstanding the foregoing, the Company may not, prior to
_______, redeem any Securities of this series as contemplated by [clause (2)
of] the preceding paragraph as a part of, or in anticipation of, any refunding
operation by the application, directly or indirectly, of moneys borrowed having
an interest cost to the Company (calculated in accordance with generally
accepted financial practice) of less than __% per annum.]

                 [The sinking fund for this series provides for the redemption
on _______ in each year beginning with the year _____ and ending with the year
_______ of [not less than] $____________ [("mandatory sinking fund") and not
more than $____________] aggregate principal amount of Securities of this
series.]  [Securities of this series acquired or redeemed by the Company
otherwise than through [mandatory] sinking fund payments may be credited
against subsequent [mandatory] sinking fund payments otherwise required to be
made--in the [inverse] order in which they become due.]

                 [In the event of redemption of this Security in part only, a
new Security or Securities of this series for the unredeemed portion hereof
will be issued in the name of the Holder hereof upon the cancellation hereof.]

                                     -20-
   29

                 [If the Security is not an Original Issue Discount Security,
insert -- If any Event of Default with respect to Securities of this series
shall occur and be continuing, the principal of the Securities of this series
may be declared due and payable in the manner and with the effect provided in
the Indenture.]  [If the Security is an Original Issue Discount Security,
insert -- If an Event of Default with respect to Securities of this series
shall occur and be continuing, an amount of principal of the Securities of this
series may be declared due and payable in the manner and with the effect
provided in the Indenture.  Such amount shall be equal--insert formula for
determining the amount.]  Upon payment (i) of the amount of principal so
declared due and payable and (ii) of interest on any overdue principal and
overdue interest (in each case to the extent that the payment of such interest
shall be legally enforceable), all of the Company's obligations in respect of
the payment of the principal of and interest, if any, on the Securities of this
series shall terminate.

                 [This Security is subject to Defeasance as described in the
Indenture.]

                 The Indenture may be modified by the Company and the Trustee
without consent of any Holder with respect to certain matters as described in
the Indenture.  In addition, the Indenture permits, with certain exceptions as
therein provided, the amendment thereof and the modification of the rights and
obligations of the Company and MCN and the rights of the Holders of the
Securities of each series to be affected under the Indenture at any time by the
Company, MCN and the Trustee with the consent of the Holders of a majority in
principal amount of the Securities at the time Outstanding of each series to be
affected.  The Indenture also contains provisions permitting the Holders of a
majority in principal amount of the Securities of each series at the time
Outstanding, on behalf of the Holders of all Securities of such series, to
waive compliance by the Company or MCN with certain provisions of the Indenture
and certain past defaults under the Indenture and their consequences.  Any such
consent or waiver by the Holder of this Security shall bind such Holder and all
future Holders of this Security and of any Security issued upon the
registration of transfer hereof or in exchange hereof or in lieu hereof,
whether or not notation of such consent or waiver is made upon this Security.

                 No reference herein to the Indenture and no provision of this
Security or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the principal of (and
premium, if any) and interest on this Security at the times, place and rate,
and in the coin or currency, herein prescribed.

                 As provided in the Indenture and subject to certain
limitations therein set forth, the transfer of this Security is registrable in
the Security Register, upon surrender of this

                                    -21-
   30

Security for registration of transfer at the office or agency of the Company in
any place where the principal of (and premium, if any) and interest on this
Security are payable, duly endorsed by, or accompanied by a written instrument
of transfer in form satisfactory to the Company and the Security Registrar duly
executed by the Holder hereof or his attorney duly authorized in writing, and
thereupon one or more new Securities of this series, of authorized
denominations and for the same Stated Maturity and aggregate principal amount,
will be issued to the designated transferee or transferees.

                 The Securities of this series are issuable only in registered
form without coupons in denominations of [$1,000] and any integral multiple
thereof.  As provided in the Indenture and subject to certain limitations
therein set forth, Securities of this series are exchangeable for a like
aggregate principal amount of Securities of this series of a different
authorized denomination, as requested by the Holder surrendering the same.

                 No service charge shall be made for any such registration of
transfer or exchange, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge payable in connection therewith.

                 Prior to due presentment of this Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name this Security is registered as the owner
hereof for all purposes, whether or not this Security be overdue, and neither
the Company, the Trustee nor any such agent shall be affected by notice to the
contrary.

                 The Indenture imposes certain limitations on the ability of
the Company and MCN to, among other things, merge or consolidate with any other
Person or sell, assign, transfer or lease all or substantially all of its
properties or assets [If other covenants are applicable pursuant to the
provisions of Section 301, insert here].  All such covenants and limitations
are subject to a number of important qualifications and exceptions.  The
Company and MCN must report periodically to the Trustee on compliance with the
covenants in the Indenture.

                 A director, officer, employee or stockholder, as such, of the
Company shall not have any liability for any obligations of the Company under
this Security or the Indenture or for any claim based on, in respect of or by
reason of, such obligations or their creation.  Each Holder, by accepting a
Security, waives and releases all such liability.  The waiver and release are
part of the consideration for the issuance of this Security.

                 [If applicable, insert -- Pursuant to a recommendation
promulgated by the Committee on Uniform Security Identification Procedures
("CUSIP"), the Company has caused CUSIP numbers to be printed on the Securities
of this series as a convenience to the

                                    -22-
   31

Holders of the Securities of this series.  No representation is made as to the
correctness or accuracy of such numbers as printed on the Securities of this
series and reliance may be placed only on the other identification numbers
printed hereon.]

        All capitalized terms used in this Security without definition which
are defined in the Indenture shall have the meanings assigned to them in the
Indenture.

                                ASSIGNMENT FORM

    To assign this Security, fill in the form below: (I) or (we) assign and
    transfer this Security to

_________________________________________________________________
      (Insert assignee's social security or tax I.D. number)

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________
       (Print or type assignee's name, address and zip code)

and irrevocably appoint  ________________________________________
agent to transfer this Security on the books of the Company.  The agent may
substitute another to act for him.


Dated: _______________  Your Signature:__________________________
                                       (Sign exactly as your name     
                                      appears on the other side     
                                    of this Security)


Signature Guaranty: ____________________________________
                    [Signatures must be guaranteed by an "eligible guarantor 
                    institution" meeting the requirements of the Transfer 
                    Agent, which requirements will include membership or 
                    participation in STAMP or such other "signature
                    guarantee program" as may be determined by the Transfer 
                    Agent in addition to, or in substitution for, STAMP, all 
                    in accordance with the Exchange Act.]

Social Security Number or Taxpayer Identification
Number:__________________________________________

SECTION 204.     Form of Trustee's Certificate of Authentication.

Dated: ________________

                                    -23-
   32

        This is one of the Securities of the series designated therein referred
to in the within-mentioned Indenture.


                                           ___________________________________
                                                                    As Trustee


                                           By ________________________________
                                                          Authorized Signatory

SECTION 205.     Securities in Global Form.

        If Securities of a series are issuable in global form, as contemplated
by Section 301, then, notwithstanding the provisions of Section 302, any such
Security shall represent such of the Outstanding Securities of such series as
shall be specified therein and may provide that it shall represent the
aggregate amount of Outstanding Securities from time to time endorsed thereon
and that the aggregate amount of Outstanding Securities represented thereby may
from time to time be reduced to reflect exchanges.  Any endorsement of a
Security in global form to reflect the amount, or any increase or decrease in
the amount, of Outstanding Securities represented thereby shall be made in such
manner and upon instructions given by such Person or Persons as shall be
specified therein or in the Company Order to be delivered to the Trustee
pursuant to Section 303 or Section 304.  Subject to the provisions of Section
303 and, if applicable, Section 304, the Trustee shall deliver and redeliver
any Security in permanent global form in the manner and upon instructions given
by the Person or Persons specified therein or in the applicable Company Order. 
If a Company Order pursuant to Section 303 or 304 has been, or simultaneously
is, delivered, any instructions by the Company with respect to endorsement or
delivery or redelivery of a Security in global form shall be in writing but
need not comply with Section 102 and need not be accompanied by an Opinion of
Counsel.

        The provisions of Section 309 shall apply to any Security represented
by a Security in global form if such Security was never issued and sold by the
Company and the Company delivers to the Trustee the Security in global form
together with written instructions (which need not comply with Section 102 and
need not be accompanied by an Opinion of Counsel) with regard to the reduction
in the principal amount of Securities represented thereby.

        Notwithstanding the provisions of Sections 201 and 307, unless
otherwise specified as contemplated by Section 301, payment of principal of,
premium, if any, and interest on any Security in permanent global form shall be
made to the Person or Persons specified therein.

                                    -24-
   33

        Notwithstanding the provisions of Section 308 and except as provided in
the preceding paragraph, the Company, the Trustee and any agent of the Company
and the Trustee shall treat a Person as the Holder of such principal amount of
Outstanding Securities represented by a permanent global Security as shall be
specified in a written statement of the Holder of such permanent global
Security.

SECTION 206.     CUSIP Number

        The Company in issuing Securities of any series may use a "CUSIP"
number, and, if so, the Trustee may use the CUSIP number in notices of
redemption or exchange as a convenience to Holders of such series; provided,
that any such notice may state that no representation is made as to the
correctness or accuracy of the CUSIP number printed on the notice or on the
Securities of such series, and that reliance may be placed only on the other
identification numbers printed on the Securities, and any such redemption shall
not be affected by any defect in or omission of such numbers.  The Company will
promptly notify the Trustee of any change in the CUSIP number of any series of
Securities.

SECTION 207.     Form of Legend for the Securities in Global Form.

        Any Security in global form authenticated and delivered hereunder shall
bear a legend in substantially the following form:

        "This Security is in global form within the meaning of the Indenture
hereinafter referred to and is registered in the name of a Common Depositary or
a U.S. Depositary.  Unless and until it is exchanged in whole or in part for
Securities in certificated form, this Security may not be transferred except as
a whole by the Common Depositary or a U.S. Depositary or by a nominee of the
Common Depositary or a nominee of the U.S. Depositary as the case may be."



                                 ARTICLE THREE

                    THE SECURITIES AND THE SUPPORT AGREEMENT

SECTION 301.     Amount Unlimited; Issuable in Series.

        The aggregate principal amount of Securities which may be authenticated
and delivered under this Indenture is unlimited.

        The Securities may be issued from time to time in one or more series. 
There shall be established in or pursuant to a Board Resolution, and set forth
in an Officer's Certificate, or established in one or more indentures
supplemental hereto, prior to the issuance of Securities of any series:

                                    -25-
   34

                 (1)      the title of the Securities of the series (which
         shall distinguish the Securities of the series from all other
         Securities);

                 (2)      any limit upon the aggregate principal amount of the
         Securities of the series which may be authenticated and delivered
         under this Indenture (except for Securities authenticated and
         delivered upon registration of transfer of, or in exchange for, or in
         lieu of, other Securities of the series pursuant to Sections 304, 305,
         306, 906 or 1107);

                 (3)      whether any Securities of the series are to be
         issuable in permanent global form with or without coupons and, if so,
         (i) whether beneficial owners of interests in any such permanent
         global Security may exchange such interests for Securities of such
         series and of like tenor of any authorized form and denomination and
         the circumstances under which any such exchanges may occur, if other
         than in the manner provided in Section 305, and (ii) the name of the
         Common Depositary (as defined in Section 304) or the U.S.  Depositary,
         as the case may be, with respect to any global Security;

                 (4)      the date or dates on which the principal of the
         Securities of the series is payable;

                 (5)      the rate or rates at which the Securities of the
         series shall bear interest, if any, or the method by which such rate
         or rates shall be determined, the date or dates from which such
         interest shall accrue, the Interest Payment Dates on which such
         interest shall be payable and the Regular Record Date for the interest
         payable on any Interest Payment Date and, if applicable to such series
         of Securities, the basis points and United States Treasury rate(s) and
         any other rates to be used in calculating the reset rate;

                 (6)      the place or places where the principal of (and
         premium, if any) and interest on Securities of the series shall be
         payable;

                 (7)      whether Securities of such series may be redeemed,
         and if so, the period or periods within which, the price or prices at
         which and the terms and conditions upon which Securities of the series
         may be redeemed, in whole or in part, at the option of the Company,
         pursuant to any sinking fund or otherwise;

                 (8)      the obligation, if any, of the Company to redeem or
         purchase Securities of the series pursuant to any sinking fund or
         analogous provisions or at the option of a Holder thereof and the
         period or periods within which, the price or prices at which and the
         terms and conditions upon which Securities of the series shall be
         redeemed or purchased, in

                                    -26-
   35

         whole or in part, pursuant to such obligation, and, where applicable,
         the obligation of the Company to select the Securities to be redeemed;

                 (9)      if other than denominations of $1,000 and any
         integral multiple thereof, the denominations in which Securities of
         the series shall be issuable;

                 (10)     if other than the principal amount thereof, the
         portion of the principal amount of Securities of the series which
         shall be payable upon declaration of acceleration of the Maturity
         thereof pursuant to Section 502;

                 (11)     additional Events of Default with respect to
         Securities of the series, if any, other than those set forth herein;

                 (12)     if either or both of Section 1302 and Section 1303
         shall be inapplicable to the Securities of the series (provided that
         if no such inapplicability shall be specified, then both Section 1302
         and Section 1303 shall be applicable to the Securities of the series);

                 (13)     if other than U.S. dollars, the currency or
         currencies or units based on or related to currencies in which the
         Securities of such series shall be denominated and in which payments
         or principal of, and any premium and interest on, such Securities
         shall or may be payable;

                 (14)     additional covenants of the Company or MCN with
         respect to Securities of the series, if any, other than those set
         forth herein;

                 (15)     if other than the Trustee, the identity of the
         Registrar and any Paying Agent; and

                 (16)     any other terms of the series (which terms shall not
         be inconsistent with the provisions of this Indenture).

                 All Securities of any one series shall be substantially
identical except as to denomination and except as may otherwise be provided in
or pursuant to such Board Resolution and set forth in such Officer's
Certificate or in any such Indenture supplemental hereto.

                 If any of the terms of the series are established by action
taken pursuant to a Board Resolution, a copy of an appropriate record of such
action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the
Officer's Certificate setting forth, or providing the manner for determining,
the terms of the Securities of such series.

                                    -27-
   36

SECTION 302.     Denominations.

                 The Securities of each series shall be issuable in registered
form without coupons in such denominations as shall be specified as
contemplated by Section 301.  In the absence of any such provisions with
respect to the Securities of any series, the Securities of such series shall be
issuable in denominations of $1,000 and any integral multiple thereof.

SECTION 303.     Execution, Authentication, Delivery and Dating.

                 The Securities shall be executed on behalf of the Company by
its Chairman of the Board, its Vice Chairman of the Board, its President, one
of its Vice Presidents or its Treasurer, under its corporate seal reproduced
thereon attested by its Secretary or one of its Assistant Secretaries.  The
signature of any of these officers on the Securities may be manual or
facsimile.  The seal of the Company may be in the form of a facsimile thereof
and may be impressed, affixed, imprinted or otherwise reproduced on the
Securities.  Typographical and other minor errors or defects in any such
reproduction of the seal or any such signature shall not affect the validity or
enforceability of any Security that has been duly authenticated and delivered
by the Trustee.

                 Securities bearing the manual or facsimile signatures of
individuals who were at any time the proper officers of the Company shall bind
the Company, notwithstanding that such individuals or any of them have ceased
to hold such offices prior to the authentication and delivery of such
Securities or did not hold such offices at the date of such Securities.

                 At any time and from time to time after the execution and
delivery of this Indenture, the Company may deliver Securities of any series
executed by the Company to the Trustee for authentication, together with a
Company Order for the authentication and delivery of such Securities, and the
Trustee in accordance with the Company Order shall authenticate and make such
Securities available for delivery; provided, however, that, with respect to
Securities of a series constituting a medium term note program, the Trustee
shall, authenticate and deliver Securities of such series for original issue
from time to time in the aggregate principal amount established for such series
pursuant to such procedures acceptable to the Trustee and to such recipients as
may be specified from time to time by such Company Order.  The maturity dates,
original issue dates, interest rates and any other terms of the Securities of
such series shall be determined by or pursuant to such Company Order and
procedures.  If provided for in such procedures, such Company Order may
authorize authentication and delivery pursuant to oral instructions from the
Company or its duly authorized agent, which instructions shall be promptly
confirmed in writing.  If the form or terms of the Securities of the series
have been established in or pursuant to one or more Board Resolutions or
indentures

                                    -28-
   37

supplemental hereto as permitted by Sections 201 and 301, in authenticating
such Securities, and accepting the additional responsibilities under this
Indenture in relation to such Securities, the Trustee shall be entitled to
receive, and (subject to Sections 315(a) through (d) of the Trust Indenture
Act) shall be fully protected in relying upon, an Opinion of Counsel stating,

                 (a)      if the form of such Securities has been established
         by or pursuant to Board Resolution or by an indenture supplemental
         hereto as permitted by Section 201, that such form has been
         established in conformity with the provisions of this Indenture;

                 (b)      if the terms of such Securities have been established
         by or pursuant to Board Resolution or by an indenture supplemental
         hereto as permitted by Section 301, that such terms have been
         established in conformity with the provisions of this Indenture;

                 (c)      that such Securities, when authenticated and
         delivered by the Trustee and issued by the Company in the manner and
         subject to any conditions specified in such Opinion of Counsel, will
         constitute valid and legally binding obligations of the Company,
         entitled to the benefits provided by the Support Agreement and the
         Indenture, enforceable in accordance with their terms, except to the
         extent enforceability may be limited by applicable bankruptcy,
         insolvency, reorganization, moratorium and other similar laws
         affecting the enforcement of creditors' rights generally and by the
         effect of general principles of equity (regardless of whether
         enforceability is considered in a proceeding in equity or at law); and

                 (d)      that no consent, approval, authorization, order,
         registration or qualification of or with any court or any governmental
         agency or body having jurisdiction over the Company is required for
         the execution and delivery of such Securities by the Company, except
         such as have been obtained (except that no opinion need be expressed
         as to state securities or Blue Sky laws).

        With respect to each issuance of Securities of a series constituting a
medium term note program, the Trustee may conclusively rely on the documents
and opinion delivered in connection with the initial issuance thereof pursuant
to Sections 201 and 301 and this Section 303, as applicable (unless revoked by
superseding comparable documents or opinions), as to the authorization of the
Board of Directors of any Securities delivered hereunder, the form thereof and
the legality, validity, binding effect and enforceability thereof.

        With respect to Securities of a series constituting a medium term note
program, if the form and general terms of the

                                    -29-
   38

Securities of such series have been established by or pursuant to one or more
Board Resolutions or by an indenture supplemental hereto, as permitted by
Sections 201 and 301, in authenticating such Securities, and accepting the
additional responsibilities under this Indenture in relation to such
Securities, the Trustee shall be entitled to receive, and (subject to Sections
315(a) through 315(d) of the Trust Indenture Act) shall be fully protected in
relying upon, in addition to the foregoing documents and Opinion of Counsel, or
in lieu of clause (c) above, an Opinion of Counsel stating that the Securities
have been duly authorized by the Company and, when duly executed by the Company
and completed and authenticated by the Trustee in accordance with the Indenture
and issued, delivered and paid for in accordance with any applicable
distribution agreement, will have been duly issued under the Indenture and will
constitute valid and legally binding obligations of the Company entitled to the
benefits provided by the Support Agreement and the Indenture, enforceable in
accordance with their respective terms, except to the extent that the
enforcement of such obligations may be subject to bankruptcy laws or insolvency
laws or other similar laws and to the exercise of judicial discretion in
accordance with general principles of equity.

         If such form or terms have been so established, the Trustee shall not
be required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonable acceptable to the Trustee, or in the written opinion of
counsel to the Trustee (which counsel may be an employee of the Trustee) such
authentication may not lawfully be made or would involve the Trustee in
personal liability.

        Notwithstanding the provisions of Section 301 and of the immediately
preceding paragraph, if all Securities of a series are not to be originally
issued at one time, it shall not be necessary to deliver the Officer's
Certificate otherwise required pursuant to Section 301 or the Company Order and
Opinion of Counsel otherwise required pursuant to the immediately preceding
paragraph at or prior to the time of authentication of each Security of such
series if such documents are delivered at or prior to the authentication upon
original issuance of the first Security of such series to be issued.

        If the Company shall establish pursuant to Section 301 that the
Securities of a series are to be issued in the form of one or more global
Securities, then the Company shall execute and the Trustee shall, in accordance
with this Section and the Company Order with respect to the authentication and
delivery of such series, authenticate and deliver one or more global Securities
that (i) shall be in an aggregate amount equal to the aggregate principal
amount specified in such Company Order, (ii) shall be registered in the name of
the Common Depositary or U.S. Depositary, as the case may be, therefor or its
nominee, and

                                    -30-
   39

(iii) shall be made available for delivery by the Trustee to such depositary or
pursuant to such depositary's instruction.

        Each depositary designated pursuant to Section 301 must, at the time of
its designation and at all times while it serves as depositary, be a clearing
agency registered under the Exchange Act and any other applicable statute or
regulation.

        Unless otherwise provided for in the form of Security, each Security
shall be dated the date of its authentication.

        No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such
Security has been duly authenticated and delivered hereunder and is entitled to
the benefits of this Indenture.

SECTION 304. Temporary Securities.

        Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
make available for delivery, temporary Securities which are printed,
lithographed, typewritten, mimeographed or otherwise produced, in any
authorized denomination, substantially of the tenor of the definitive
Securities in lieu of which they are issued and with such appropriate
insertions, omissions, substitutions and other variations as the officers
executing such Securities may determine, as evidenced by their execution of
such Securities.

        In the case of Securities of any series, such temporary Securities may
be in global form, representing all or a portion of the Outstanding Securities
of such series.

        Except in the case of temporary Securities in global form (which shall
be exchanged in accordance with the provisions of Section 305), if temporary
Securities of any series are issued, the Company will cause definitive
Securities of that series to be prepared without unreasonable delay. After the
preparation of definitive Securities of such series, the temporary Securities
of such series shall be exchangeable for definitive Securities of such series
upon surrender of the temporary Securities of such series at the office or
agency of the Company in a Place of Payment for that series, without charge to
the Holder.  Upon surrender for cancellation of any one or more temporary
Securities of any series, the Company shall execute and the Trustee shall
authenticate and make available for delivery in exchange therefor a like
principal amount of definitive Securities of the same series of authorized
denominations and of like tenor.  Until so exchanged, the temporary Securities
of any series shall in all respects be

                                    -31-
   40

entitled to the same benefits under this Indenture as definitive Securities of
such series.

                 If temporary Securities of any series are issued in global
form, any such temporary global Security shall, unless otherwise provided
therein, be delivered to the office of a depositary or common depositary (the
"COMMON DEPOSITARY") for credit to the respective accounts of the beneficial
owners of such Securities (or to such other accounts as they may direct).

SECTION 305.     Registration, Registration of Transfer and Exchange.

                 The Company shall cause to be kept at the Corporate Trust
Office of the Trustee a register (the register maintained in such office and in
any other office or agency of the Company in a Place of Payment being herein
sometimes collectively referred to as the "SECURITY REGISTER") in which,
subject to such reasonable regulations as it may prescribe, the Company shall
provide for the registration of Securities and of registration of transfers of
Securities.  The Trustee is hereby appointed "SECURITY REGISTRAR" for the
purpose of registering Securities and transfers of Securities as herein
provided.

                 Upon surrender for registration of transfer of any Security of
any series at the office or agency of the Company in Place of Payment for that
series, the Company shall execute, and the Trustee shall authenticate and make
available for delivery, in the name of the designated transferee or
transferees, one or more new Securities of the same series, of any authorized
denominations and of a like aggregate principal amount and Stated Maturity.

                 At the option of the Holder, Securities of any series may be
exchanged for other Securities of the same series, of any authorized
denominations and of a like aggregate principal amount and Stated Maturity,
upon surrender of the Securities to be exchanged at such office or agency.
Whenever any Securities are so surrendered for exchange, the Company shall
execute, and the Trustee shall authenticate and make available for delivery,
the Securities which the Holder making the exchange is entitled to receive.

                 Notwithstanding the foregoing, except as otherwise specified
as contemplated by Section 301, any permanent global Security shall be
exchangeable only as provided in this paragraph.  If the beneficial owners of
interests in a permanent global Security are entitled to exchange such
interests for Securities of such series and of like tenor and principal amount
of another authorized form and denomination, as specified and as subject to the
conditions contemplated by Section 301, then without unnecessary delay but in
any event not later than the earliest date on which such interests may be so
exchanged, the Company shall deliver to the Trustee definitive Securities of

                                    -32-
   41

that series in aggregate principal amount equal to the principal amount of such
permanent global Security, executed by the Company.  On or after the earliest
date on which such interests may be so exchanged, such permanent global
Securities shall be surrendered from time to time by the Common Depositary or
the U.S. Depositary, as the case may be, and in accordance with instructions
given to the Trustee and the Common Depositary or the U.S. Depositary, as the
case may be (which instructions shall be in writing but need not comply with
Section 102 or be accompanied by an Opinion of Counsel), as shall be specified
in the Company Order with respect thereto to the Trustee, as the Company's
agent for such purpose, to be exchanged, in whole or in part, for definitive
Securities of the same series without charge.  The Trustee shall authenticate
and make available for delivery, in exchange for each portion of such
surrendered permanent global Security, a like aggregate principal amount of
definitive Securities of the same series of authorized denominations and of
like tenor as the portion of such permanent global Security to be exchanged
which shall be in the form of the Securities of such series; provided, however,
that no such exchanges may occur during a period beginning at the opening of
business 15 days before the day of the mailing of a notice of redemption of
Securities of that series selected for redemption under Section 1103 and ending
at the close of business on the day of such mailing.  Promptly following any
such exchange in part, such permanent global Security shall be returned by the
Trustee to the Common Depositary or the U.S. Depositary, as the case may be, or
such other Common Depositary or U.S. Depositary referred to above in accordance
with the written instructions of the Company referred to above.  If a Security
in the form specified for such series is issued in exchange for any portion of
a permanent global Security after the close of business at the office or agency
where such exchange occurs on (i) any Regular Record Date and before the
opening of business at such office or agency on the relevant Interest Payment
Date, or (ii) any Special Record Date and before the opening of business at
such office or agency on the related proposed date for payment of interest or
Defaulted Interest, as the case may be, such interest or Defaulted Interest
will not be payable on such Interest Payment Date or proposed date for payment,
as the case may be, in respect of such Security in the form specified for such
series, but will be payable on such Interest Payment Date or proposed date for
payment, as the case may be, only to the Person to whom interest in respect of
such portion of such permanent global Security is payable in accordance with
the provisions of this Indenture.

                 All Securities issued upon any registration of transfer or
exchange of Securities shall be the valid obligations of the Company,
evidencing the same debt, and entitled to the same benefits under this
Indenture, as the Securities surrendered upon such registration of transfer or
exchange.

                 Every Security presented or surrendered for registration of
transfer or for exchange shall (if so required by

                                    -33-
   42

the Company or the Trustee) be duly endorsed, or be accompanied by a written
instrument of transfer in form satisfactory to the Company and the Security
Registrar duly executed, by the Holder thereof or his attorney duly authorized
in writing.

                 Unless otherwise provided in the Securities to be transferred
or exchanged, no service charge shall be made for any registration of transfer
or exchange of Securities, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge that may be imposed in
connection with any registration of transfer or exchange of Securities, other
than exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

                 The Company shall not be required (i) to issue, register the
transfer of or exchange Securities of any series during a period beginning at
the opening of business 15 days before the day of the mailing of a notice of
redemption of Securities of that series selected for redemption under Section
1103 and ending at the close of business on the day of such mailing, or (ii) to
register the transfer of or exchange any Security so selected for redemption in
whole or in part, except the unredeemed portion of any Security being redeemed
in part.

SECTION 306.     Mutilated, Destroyed, Lost and Stolen Securities.

                 If any mutilated Security is surrendered to the Trustee, the
Company shall execute and the Trustee shall authenticate and deliver in
exchange therefor a new Security of the same series and of like tenor and
principal amount and bearing a number not contemporaneously outstanding.

                 If there shall be delivered to the Company and the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any
Security and (ii) such security or indemnity as may be required by them to save
each of them and any agent of either of them harmless, then, in the absence of
notice to the Company or the Trustee that such Security has been acquired by a
bona fide purchaser, the Company shall execute and upon its request the Trustee
shall authenticate and deliver, in lieu of any such destroyed, lost or stolen
Security, a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

                 In case any such mutilated, destroyed, lost or stolen Security
has become or is about to become due and payable, the Company in its discretion
may, instead of issuing a new Security, pay such Security.

                 Upon the issuance of any new Security under this Section, the
Company may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee) connected therewith.

                                    -34-
   43


                 Every new Security of any series issued pursuant to this
Section in lieu of any destroyed, lost or stolen Security shall constitute an
original additional contractual obligation of the Company, whether or not the
destroyed, lost or stolen Security shall be at any time enforceable by anyone,
and shall be entitled to all the benefits of this Indenture equally and
proportionately with any and all other Securities of that series duly issued
hereunder.

                 The provisions of this Section are exclusive and shall
preclude (to the extent lawful) all other rights and remedies with respect to
the replacement or payment of mutilated, destroyed, lost or stolen Securities.

SECTION 307.     Payment of Interest; Interest Rights Preserved.

                 Interest on any Security which is payable, and is punctually
paid or duly provided for, on any Interest Payment Date shall be paid to the
Person in whose name that Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date for such
interest.

                 Any interest on any Security of any series which is payable,
but is not punctually paid or duly provided for, on any Interest Payment Date
(herein called "DEFAULTED INTEREST") shall forthwith cease to be payable to the
Holder on the relevant Regular Record Date by virtue of having been such
Holder, and such Defaulted Interest may be paid by the Company, at its election
in each case, as provided in Clause (1) or (2) below:

                 (1)      The Company may elect to make payment of any
         Defaulted Interest to the Persons in whose names the Securities of
         such series (or their respective Predecessor Securities) are
         registered at the close of business on a Special Record Date for the
         payment of such Defaulted Interest, which shall be fixed in the
         following manner.  The Company shall notify the Trustee in writing of
         the amount of Defaulted Interest proposed to be paid on each Security
         of such series and the date of the proposed payment, and at the same
         time the Company shall deposit with the Trustee an amount of money
         equal to the aggregate amount proposed to be paid in respect of such
         Defaulted Interest or shall make arrangements satisfactory to the
         Trustee for such deposit prior to the date of the proposed payment,
         such money when deposited to be held in trust for the benefit of the
         Persons entitled to such Defaulted Interest as in this Section 307
         provided.  Thereupon the Trustee shall fix a Special Record Date for
         the payment of such Defaulted Interest which shall be not more than 15
         days and not less than 10 days prior to the date of the proposed
         payment and not less than 10 days after the receipt by the Trustee of
         the notice of the proposed payment.  The Trustee shall promptly notify
         the Company of such Special Record Date and, in the name and at the
         expense of the Company, shall cause notice of the

                                    -35-
   44

         proposed payment of such Defaulted Interest and the Special Record
         Date therefor to be mailed, first-class postage prepaid, to each
         Holder of Securities of such series at his address as it appears in
         the Security Register, not less than 10 days prior to such Special
         Record Date.  Notice of the proposed payment of such Defaulted
         Interest and the Special Record Date therefor having been so mailed,
         such Defaulted Interest shall be paid to the Persons in whose names
         the Securities of such series (or their respective Predecessor
         Securities) are registered at the close of business on such Special
         Record Date and shall no longer be payable pursuant to the following
         Clause (2).

                          (2)     The Company may make payment of any Defaulted
         Interest on the Securities of any series in any other lawful manner
         not inconsistent with the requirements of any securities exchange on
         which such Securities may be listed, and upon such notice as may be
         required by such exchange, if, after notice given by the Company to
         the Trustee of the proposed payment pursuant to this Section 307, such
         manner of payment shall be deemed practicable by the Trustee.

                 Subject to the foregoing provisions of this Section, each
Security delivered under this Indenture upon registration of transfer of or in
exchange for or in lieu of any other Security shall carry the rights to
interest accrued and unpaid, and to accrue, which were carried by such other
Security.

SECTION 308.     Persons Deemed Owners.

                 Prior to due presentment of a Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Security is registered as the owner of
such Security for the purpose of receiving payment of principal of (and
premium, if any) and (subject to Section 307) interest on such Security and for
all other purposes whatsoever, whether or not such Security be overdue, and
neither the Company, the Trustee nor any agent of the Company or the Trustee
shall be affected by notice to the contrary.

                 None of the Company, the Trustee or any agent of the Company
or the Trustee shall have any responsibility or liability for any aspect of the
records relating to or payments made on account of beneficial ownership
interest of a Security in global form, or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interest.
Notwithstanding the foregoing, with respect to any Security in global form,
nothing herein shall prevent the Company or the Trustee or any agent of the
Company or the Trustee from giving effect to any written certification, proxy
or other authorization furnished by any Common Depositary (or its nominee), as
a Holder, with respect to such Security in global form or impair, as between
such Common Depositary and owners of beneficial interests in such Security in

                                    -36-
   45

global form, the operation of customary practices governing the exercise of the
right of such Common Depositary (or its nominee) as holder of such Security in
global form.

SECTION 309.     Cancellation.

                 All Securities surrendered for payment, redemption,
registration of transfer or exchange or for credit against any sinking fund
payment shall, if surrendered to any Person other than the Trustee, be
delivered to the Trustee and shall be promptly cancelled by it.  The Company
may at any time deliver to the Trustee for cancellation any Securities
previously authenticated and delivered hereunder which the Company may have
acquired in any manner whatsoever, and all Securities so delivered shall be
promptly cancelled by the Trustee.  No Securities shall be authenticated in
lieu of or in exchange for any Securities cancelled as provided in this
Section, except as expressly permitted by this Indenture.  All cancelled
Securities shall be held by the Trustee and may be destroyed (and, if so
destroyed, certification of their destruction shall be delivered to the
Company, unless, by a Company Order, the Company shall direct that cancelled
Securities be returned to it).

SECTION 310.     Computation of Interest.

                 Except as otherwise specified as contemplated by Section 301
for Securities of any series, interest on the Securities of each series shall
be computed on the basis of a year of twelve 30-day months.

SECTION 311.     Support Agreement.

                 Holders of Securities and the Trustee are entitled to the
benefits of the Support Agreement available to Lenders (as defined in the
Support Agreement), it being understood and agreed that the Securities
constitute Debt (as defined in the Support Agreement) for the purposes of the
Support Agreement.

                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401.     Satisfaction and Discharge of Indenture.

                 This Indenture shall cease to be of further effect (except as
to any surviving rights of registration of transfer or exchange of Securities
herein expressly provided for or in the form of Security for such series), when
the Trustee, upon Company Request and at the expense of the Company, shall
execute proper instruments acknowledging satisfaction and discharge of this
Indenture, when

                 (1)      either

                                    -37-
   46

        (A)      all Securities theretofore authenticated and delivered (other
than (i) Securities which have been destroyed, lost or stolen and which have
been replaced or paid as provided in Section 306 and (ii) Securities for whose
payment money has theretofore been deposited in trust or segregated and held in
trust by the Company and thereafter repaid to the Company or discharged from
such trust, as provided in Section 1009) have been delivered to the Trustee for
cancellation; or

        (B)      all such Securities not theretofore delivered to the Trustee 
for cancellation

                 (i)  have become due and payable, or

                 (ii)  will become due and payable at their Stated Maturity 
within one year, or

                (iii)  are to be called for redemption within one year under 
arrangements satisfactory to the Trustee for the giving of notice of
redemption by the Trustee in the name, and at the expense, of the Company,

and the Company, in the case of (i), (ii) or (iii) above, has deposited with
the Trustee as trust funds in trust for the purpose an amount sufficient to pay
and discharge the entire indebtedness on such Securities not theretofore
delivered to the Trustee for cancellation, for principal (and premium, if any)
and interest to the date of such deposit (in the case of Securities which have
become due and payable) or the Stated Maturity or Redemption Date, as the case
may be;

        (2)      the Company has paid or caused to be paid all other sums
payable hereunder by the Company; and

        (3)      the Company has delivered to the Trustee an Officer's
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for herein relating to the satisfaction and discharge of
this Indenture have been complied with.

        Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Company to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to subclause (B) of clause (1) of
this Section, the obligations of the Trustee under Section 402 and the last
paragraph of Section 1009 shall survive.

SECTION 402.     Application of Trust Money.

        Subject to the provisions of the last paragraph of Section 1009, all
money deposited with the Trustee pursuant to Section 401 shall be held in trust
and applied by it, in accordance with the provisions of the Securities and this

                                    -38-
   47

Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal (and premium, if
any) and interest for whose payment such money has been deposited with or
received by the Trustee.



                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501.     Events of Default.

                 "EVENT OF DEFAULT," wherever used herein with respect to
Securities of any series, means any one of the following events (whatever the
reason for such Event of Default and whether it shall be voluntary or
involuntary or to be effected by operation of law or pursuant to any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body):

                 (1)      the Company defaults in the payment of interest on
any Security of that series when such interest becomes due and payable and the
default continues for a period of 30 days; or

                 (2)      the Company defaults in the payment of the principal
of (or premium, if any, on) any Security of that series when the same becomes
due and payable at Maturity, upon redemption (including redemptions under
Article Eleven), or otherwise; or

                 (3)      the Company or MCN fails to observe or perform any of
its other covenants, warranties or agreements in the Securities of that series,
this Indenture or the Support Agreement (other than a covenant, agreement or
warranty a default in whose performance or whose breach is elsewhere in this
Section specifically dealt with or which has expressly been included in this
Indenture solely for the benefit of series of Securities other than that
series), and the failure to observe or perform continues for the period and
after the notice specified in the last paragraph of this Section; or

                 (4)      any Event of Default under any series of Securities
issued pursuant to this Indenture or any event of default, as defined in any
other indenture, mortgage, indenture, or instrument under which there may be
issued, or by which there may be secured or evidenced, any Indebtedness of the
Company, MCN or a Subsidiary of either MCN or the Company (whether such
Indebtedness now exists or shall hereafter be created or incurred), but
excluding Project Finance Indebtedness, shall occur and shall consist of
default in the payment of such Indebtedness at the maturity thereof (after
giving effect to any

                                    -39-
   48

applicable grace period) or shall result in Indebtedness becoming or being
declared due and payable prior to the date on which it would otherwise become
due and payable, and such default in payment is not cured or such acceleration
shall not be rescinded or annulled within 10 days after written notice to the
Company from the Trustee or to the Company and to the Trustee from the Holders
of at least 10% in aggregate principal amount of the Securities of that series
at the time outstanding; provided that it shall not be an Event of Default if
the principal amount of Indebtedness (other than Indebtedness represented by
Securities issued pursuant to this Indenture) which is not paid at maturity or
the maturity of which is accelerated is less than the amount equal to 1% of the
consolidated total assets of MCN (determined as of its most recent fiscal
year-end); provided further, that it shall not be an Event of Default if the 
Indebtedness with respect to which such default has occurred is Indebtedness of
Supply Development Group, Inc. or its Subsidiaries and the obligations of MCN
and its Subsidiaries with respect to such Indebtedness (other than Supply
Development Group, Inc. and its Subsidiaries) are no greater than the
obligations of MCN pursuant to the Support Agreement of MCN Corporation made as
of August 23, 1995, as amended on October 4, 1995 (the "Supply Development
Agreement") among MCN, Supply Development Group, Inc. and certain of its
Subsidiaries and does not obligate payments by the obligor under such
agreement with respect to anything other than the payments specified in
Paragraphs 3, 4 and 5 of the Supply Development Agreement (limiting for these
purposes the term "Material Contracts" to the same general type of contracts
for which MCN is obligated to make payments under the Supply Development
Agreement); provided further that if, prior to a declaration of acceleration of
the maturity of the Securities of that series or the entry of judgment in favor
of the Trustee in a suit pursuant to Section 503, such default shall be
remedied or cured by the Company or waived by the holders of such Indebtedness,
then the Event of Default hereunder by reason thereof shall be deemed likewise
to have been thereupon remedied, cured or waived without further action upon
the part of either the Trustee or any of the Holders of the Securities of that
series, and provided further, that, subject to Sections 601 and 602, the
Trustee shall not be charged with knowledge of any such default unless written
notice of such default shall have been given to the Trustee by the Company, by
a holder or an agent of a holder of any such Indebtedness, by the trustee then
acting under any indenture or other instrument under which such default shall
have occurred, or by the Holders of at least five percent in aggregate
principal amount of the Securities of that series at the time outstanding; or

                 (5)      the Company, MCN or a Significant Subsidiary pursuant
to or within the meaning of any Bankruptcy Law (A) commences a voluntary case
or proceeding under any Bankruptcy Law with respect to itself, (B) consents to
the entry of a judgment, decree or order for relief against it in an
involuntary case or proceeding under any Bankruptcy Law, (C) consents to or
acquiesces in the institution of bankruptcy or insolvency proceedings against
it, (D) applies for, consents to or acquiesces in the appointment of or taking
possession by a Custodian in respect of it or for any material part of its
property, (E) makes a general assignment for the benefit of its creditors or
(F) takes any corporate action in furtherance of or to facilitate,
conditionally or otherwise, any of the foregoing; or

                 (6) (i)  a court of competent jurisdiction enters a judgment,
decree or order for relief in respect of the Company, MCN or a Significant
Subsidiary in an involuntary case or proceeding under any Bankruptcy Law which
shall (A) approve as properly filed a petition seeking reorganization,
arrangement, adjustment or composition in respect of the Company, MCN or a
Significant Subsidiary, as the case may be, (B) appoint a


                                    -40-
   49

Custodian of the Company, MCN or a Significant Subsidiary, as the case may be,
or for any material part of its property or (C) order the winding-up or
liquidation of its affairs, and such judgment, decree or order shall remain
unstayed and in effect for a period of 60 consecutive days; or (ii) any
bankruptcy or insolvency petition or application is filed, or any bankruptcy or
insolvency proceeding is commenced against the Company, MCN or a Significant
Subsidiary and such petition, application or proceeding is not dismissed within
60 days; or (iii) a warrant of attachment is issued against any material
portion of the property of the Company, MCN or a Significant Subsidiary which
is not released within 60 days of service; or

        (7)          any other Event of Default provided with respect to
Securities of that series.

        A Default under clause (3) above is not an Event of Default until the
Trustee or the Holders of at least 25% in aggregate principal amount of the
Outstanding Securities of that series notify the Company of the Default and the
Company does not cure the Default within 60 days after receipt of the notice. 
The notice must specify the Default, demand that it be remedied and state that
the notice is a "Notice of Default."  When a Default under clause (3) above is
cured within such 60-day period, it ceases.

SECTION 502.  Acceleration of Maturity; Rescission and Annulment.

        If an Event of Default with respect to Securities of any series (other
than an Event of Default specified in clause (5) or (6) of Section 501) occurs
and is continuing, the Trustee by notice in writing to the Company, or the
Holders of at least 25% in aggregate principal amount of the Outstanding
Securities of that series by notice in writing to the Company and the Trustee,
may declare the unpaid principal of and accrued interest to the date of
acceleration (or, if the Securities of that series are Original Issue Discount
Securities, such portion of the principal amount as may be specified in the
terms of that series) on all the Outstanding Securities of that series to be
due and payable immediately and, upon any such declaration, the Outstanding
Securities of that series (or specified principal amount) shall become and be
immediately due and payable.

        If an Event of Default specified in clause (5) or (6) of Section 501
occurs, all unpaid principal of and accrued interest on the Outstanding
Securities of that series (or specified principal amount) shall ipso facto
become and be immediately due and payable without any declaration or other act
on the part of the Trustee or any Holder of any Security of that series.

        Upon payment of all such principal and interest, all of the Company's
obligations under the Securities of that series and

                                    -41-
   50

(upon payment of the Securities of all series) this Indenture shall terminate,
except obligations under Section 607.

        The Holders of a majority in principal amount of the Outstanding
Securities of that series by notice to the Trustee may rescind an acceleration
and its consequences if (i) all existing Events of Default, other than the
nonpayment of the principal and interest of the Securities of that series that
has become due solely by such declaration of acceleration, have been cured or
waived, (ii) to the extent the payment of such interest is lawful, interest on
overdue installments of interest and overdue principal that has become due
otherwise than by such declaration of acceleration have been paid, (iii) the
rescission would not conflict with any judgment or decree of a court of
competent jurisdiction and (iv) all payments due to the Trustee and any
predecessor Trustee under Section 607 have been made.

SECTION 503.   Collection of Indebtedness and Suits for Enforcement by Trustee.

        The Company covenants that if:

        (1)     default is made in the payment of any interest on any Security 
of any series when such interest becomes due and payable and such default 
continues for a period of 30 days, or

        (2)     default is made in the payment of the principal of (or premium, 
if any, on) any Security of any series at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on such
Securities for principal (and premium, if any) and interest and, to the extent
that payment of such interest shall be legally enforceable, interest on any
overdue principal (and premium, if any) and on any overdue interest, at the
rate or rates prescribed therefor in such Securities, and, in addition thereto,
such further amount as shall be sufficient to cover the reasonable costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

        If the Company fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute
a judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company, MCN (pursuant to its Support Obligations) or any other
obligor upon such Securities and collect the moneys adjudged or decreed to be
payable in the manner provided by law out of the property of the Company, MCN
(subject to the limitations set forth in the Support Agreement) or any other
obligor upon such Securities, wherever situated.

                                    -42-
   51

        If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series
by such appropriate judicial proceedings as the Trustee shall deem most
effectual to protect and enforce any such rights, whether for the specific
enforcement of any covenant or agreement in this Indenture or the Support
Agreement or in aid of the exercise of any power granted herein, or to secure
any other proper remedy.

SECTION 504.  Trustee May File Proofs of Claim.

        In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the Company, MCN or any other obligor upon the
Securities or the property of the Company, MCN or of such other obligor or
their creditors, the Trustee (irrespective of whether the principal of the
Securities shall then be due and payable as therein expressed or by declaration
or otherwise and irrespective of whether the Trustee shall have made any demand
on the Company or MCN for the payment of overdue principal or interest) shall
be entitled and empowered, by intervention in such proceeding or otherwise,

                 (i)    to file and prove a claim for the whole amount of 
            principal (and premium, if any) and interest owing and unpaid in 
            respect of the Securities and to file such other papers or 
            documents as may be necessary or advisable in order to have the
            claims of the Trustee (including any claim for the reasonable
            compensation, expenses, disbursements and advances of the Trustee,
            its agent and counsel) and of the Holders allowed in such judicial
            proceedings, and

                (ii)    to collect and receive any moneys or other property 
            payable or deliverable on any such claims and to distribute the 
            same; and any custodian, receiver, assignee, trustee, liquidator, 
            sequestrator or other similar official in any such judicial 
            proceeding is hereby authorized by each Holder to make such 
            payments to the Trustee and, in the event that the Trustee shall 
            consent to the making of such payments directly to the Holders, 
            to pay to the Trustee any amount due it for the reasonable 
            compensation, expenses, disbursements and advances of the Trustee, 
            its agents and counsel, and any other amounts due the Trustee 
            under Section 607.

        Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding.

                                    -43-
   52

SECTION 505.   Trustee May Enforce Claims Without Possession of Securities.

        All rights of action and claims under this Indenture, the Support
Agreement or the Securities may be prosecuted and enforced by the Trustee
without the possession of any of the Securities or the production thereof in
any proceeding relating thereto, and any such proceeding instituted by the
Trustee shall be brought in its own name as trustee of an express trust, and
any recovery of judgment shall, after provision for the payment of the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel, be for the ratable benefit of the Holders of the
Securities in respect of which such judgment has been recovered.

SECTION 506.   Application of Money Collected.

        Any money collected by the Trustee pursuant to this Article in respect
of the Securities of any series shall be applied in the following order, at the
date or dates fixed by the Trustee and, in case of the distribution of such
money on account of principal (or premium, if any) or interest, upon
presentation of the Securities in respect of which moneys have been collected
and the notation thereon of the payment if only partially paid and upon
surrender thereof if fully paid:

        First:  To the payment of all amounts due the Trustee under Section 607
applicable to such series;

        Second:  To the payment of the amounts then due and unpaid for
principal of (and premium, if any) and interest on the Securities of such
series in respect of which or for the benefit of which such money has been
collected, ratably, without preference or priority of any kind, according to
the amounts due and payable on such Securities of such series for principal
(and premium, if any) and interest, respectively; and

        Third:  To the Company or MCN, as the case may be.

        The Trustee may fix a record date and payment date for any payment to
Holders pursuant to this Section 506.  At least fifteen (15) days before such
record date, the Trustee shall mail to each Holder and the Company a notice
that states the record date, the payment date and the amount to be paid.

SECTION 507.   Limitation on Suits.

        No Holder of any Security of any series shall have any right to
institute any proceeding, judicial or otherwise, with respect to this
Indenture, or for the appointment of a receiver or trustee, or for any other
remedy hereunder, unless:


                                    -44-
   53


        (1)   such Holder has previously given written notice to the Trustee of 
a continuing Event of Default with respect to the Securities of that series;

        (2)   the Holders of not less than 25% in principal amount of the 
Outstanding Securities of that series shall have made written request to
the Trustee to institute proceedings in respect of such Event of Default in its
own name as Trustee hereunder;

        (3)   such Holder or Holders have offered to the Trustee reasonable 
indemnity against the costs, expenses and liabilities to be incurred in 
compliance with such request;

        (4)   the Trustee for 60 days after its receipt of such notice, request 
and offer of indemnity has failed to institute any such proceeding; and

        (5)   no direction inconsistent with such written request has been 
given to the Trustee during such 60-day period by the Holders of a majority 
in principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of Holders of Securities
of any series shall have any right in any manner whatever by virtue of, or by
availing of, any provision of this Indenture or the Support Agreement to
affect, disturb or prejudice the rights of any other of such Holders, or to
obtain or to seek to obtain priority or preference over any other of such
Holders or to enforce any right under this Indenture or the Support Agreement,
except in the manner herein provided and for the equal and ratable benefit of
all Holders of Securities of the affected series.

SECTION 508.   Unconditional Right of Holders to Receive Principal, Premium 
               and Interest.

        Notwithstanding any other provision in this Indenture, the Holder of
any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of (and premium, if any) and (subject to
Section 307) interest on such Security on the Stated Maturity or Maturities
expressed in such Security (or, in the case of redemption, on the Redemption
Date) and to institute suit for the enforcement of any such payment, and such
rights shall not be impaired without the consent of such Holder.

SECTION 509.   Restoration of Rights and Remedies.

        If the Trustee or any Holder has instituted any proceeding to enforce
any right or remedy under this Indenture or the Support Agreement and such
proceeding has been discontinued or abandoned for any reason, or has been
determined adversely to the Trustee or to such Holder, then and in every such
case,

                                    -45-
   54

subject to any determination in such proceeding, the Company, MCN, the Trustee
and the Holders shall be restored severally and respectively to their former
positions hereunder and thereafter all rights and remedies of the Trustee and
the Holders shall continue as though no such proceeding has been instituted.

SECTION 510.   Rights and Remedies Cumulative.

               Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities in the last 
paragraph of Section 306, no right or remedy herein conferred upon or reserved
to the Trustee or to the Holders is intended to be exclusive of any other right 
or remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise. The assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent
the concurrent assertion or employment of any other appropriate right or
remedy.

SECTION 511.   Delay or Omission Not Waiver.

               No delay or omission of the Trustee or of any Holder of any 
Securities to exercise any right or remedy accruing upon any Event of
Default shall impair any such right or remedy or constitute a waiver of any
such Event of Default or an acquiescence therein.  Every right and remedy given
by this Article or by law to the Trustee or to the Holders may be exercised
from time to time, and as often as may be deemed expedient, by the Trustee or
by the Holders, as the case may be.

SECTION 512.   Control by Holders.

               The Holders of a majority in principal amount of the Outstanding 
Securities of any series shall have the right to direct the time, method and 
place of conducting any proceeding for any remedy available to the Trustee, or 
exercising any trust or power conferred on the Trustee, with respect to the 
Securities of such series, provided that:

               (1)   such direction shall not be in conflict with any rule of 
law or with this Indenture;

               (2)   the Trustee may take any other action deemed proper by 
the Trustee which is not inconsistent with such direction; and

               (3)   subject to Section 601, the Trustee need not take any 
action which might involve the Trustee in personal liability or be unduly 
prejudicial to the Holders not joining therein.

                                    -46-
   55

SECTION 513.   Waiver of Past Defaults.

               The Holders of not less than a majority in principal amount of 
the Outstanding Securities of any series may by written notice to the Trustee on
behalf of the Holders of all the Securities of such series waive any Default or
Event of Default with respect to such series and its consequences, except a
Default or Event of Default

               (1)   in respect of the payment of the principal of (or premium, 
if any) or interest on any Security of such series, or

               (2)   in respect of a covenant or other provision hereof which 
under Article Nine cannot be modified or amended without the consent of the 
Holder of each Outstanding Security of such series affected.

               Upon any such waiver, such Default or Event of Default shall 
cease to exist and shall be deemed to have been cured, for every purpose of this
Indenture and the Securities of such series; but no such waiver shall extend to
any subsequent or other Default or Event of Default or impair any right
consequent thereon.

SECTION 514.   Undertaking for Costs.

               All parties to this Indenture agree, and each Holder of any 
Security by his acceptance thereof shall be deemed to have agreed, that any 
court may in its discretion require, in any suit for the enforcement of any 
right or remedy under this Indenture, or in any suit against the Trustee for 
any action taken, suffered or omitted by it as Trustee, the filing by any party 
litigant in such suit of an undertaking to pay the costs of such suit, and that 
such court may in its discretion assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in such suit, having due regard to
the merits and good faith of the claims or defenses made by such party 
litigant; but the provisions of this Section shall not apply to any suit 
instituted by the Company, to any suit instituted by the Trustee, to any suit 
instituted by any Holder, or group of Holders, holding in the aggregate more 
than 10% in principal amount of the Outstanding Securities of any series, or to 
any suit instituted by any Holder for the enforcement of the payment of the 
principal of (or premium, if any) or interest on any Security on or after the 
Stated Maturity or Maturities expressed in such Security (or, in the case of
redemption, on or after the Redemption Date).

                                    -47-
   56

                                  ARTICLE SIX

                                  THE TRUSTEE

SECTION 601.    Certain Duties and Responsibilities of the Trustee.

                (a)   Except during the continuance of an Event of Default, the 
Trustee's duties and responsibilities under this Indenture shall be governed 
by Section 315(a) of the Trust Indenture Act.

                (b)   In case an Event of Default has occurred and is 
continuing, and is known to the Trustee, the Trustee shall exercise the
rights and powers vested in it by this Indenture, and shall use the same degree
of care and skill in their exercise, as a prudent man would exercise or use
under the circumstances in the conduct of his own affairs.

                (c)   None of the provisions of Section 315(d) of the Trust 
Indenture Act shall be excluded from this Indenture.

SECTION 602.    Notice of Defaults.

                Within 30 days after the occurrence of any Default or Event 
of Default with respect to the Securities of any series, the Trustee shall 
give to all Holders of Securities of such series, as their names and
addresses appear in the Security Register, notice of such Default or Event of
Default known to the Trustee, unless such Default or Event of Default shall
have been cured or waived; provided, however, that, except in the case of a
Default or Event of Default in the payment of the principal of (or premium, if
any) or interest on any Security of such series or in the payment of any
sinking fund installment with respect to Securities of such series, the Trustee
shall be protected in withholding such notice if and so long as the board of
directors, the executive committee or directors or Responsible Officers of the
Trustee in good faith determine that the withholding of such notice is in the
interest of the Holders of Securities of such series.

SECTION 603.    Certain Rights of Trustee.

                Subject to the provisions of the Trust Indenture Act:

                (a)   the Trustee may rely and shall be protected in acting 
or refraining from acting upon any resolution, certificate, statement, 
instrument, opinion, report, notice, request, direction, consent, order, bond, 
debenture, note, other evidence of indebtedness or other paper or document 
believed by it to be genuine and to have been signed or presented by the proper 
party or parties;

                                    -48-
   57

        (b)   any request or direction of the Company mentioned herein shall be
sufficiently evidenced by a Company Request or Company Order and any resolution
of the Board of Directors may be sufficiently evidenced by a Board Resolution;

        (c)   whenever in the administration of this Indenture the Trustee
shall deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its
part, rely upon an Officer's Certificate;

        (d)   the Trustee may consult with counsel and the written advice of
such counsel or any Opinion of Counsel shall be full and complete authorization
and protection in respect of any action taken, suffered or omitted by it
hereunder in good faith and in reliance thereon;

        (e)   the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders pursuant to this Indenture, unless such Holders shall have
offered to the Trustee security or indemnity to its reasonable satisfaction
against the costs, expenses and liabilities which might be incurred by it in
compliance with such request or direction;

        (f)   prior to the occurrence of an Event of Default with respect to
the Securities of any series and after the curing or waiving of all such Events
of Default which may have occurred, the Trustee shall not be bound to make any
investigation into the facts or matters stated in any resolution, certificate,
statement, instrument, opinion, report, notice, request, direction, consent,
order, approval or other paper or document, or the books and records of the
Company, unless requested in writing to do so by the Holders of a majority in
principal amount of the Outstanding Securities of any series; provided,
however, that if the payment within a reasonable time to the Trustee of the
costs, expenses or liabilities likely to be incurred by it in the making of
such investigation is not, in the opinion of the Trustee, reasonably assured to
the Trustee by the security afforded to it by the terms of this Indenture, the
Trustee may require reasonable indemnity against such costs, expenses or
liabilities as a condition to so proceeding; the reasonable expense of every
such investigation shall be paid by the Company or, if paid by the Trustee,
shall be repaid by the Company upon demand;

        (g)   the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder; and

                                    -49-
   58

              (h)   the Trustee shall not be required to expend or risk its own 
funds or otherwise incur any financial liability in the performance of any of 
its duties hereunder, or in the exercise of its rights or powers, if it shall 
have reasonable grounds for believing that repayment of such funds or 
adequate indemnity against such risk or liability is not reasonably assured to 
it.

SECTION 604.  Not Responsible for Recitals or Issuance of Securities.

              The recitals herein and in the Securities, except the Trustee's 
certificates of authentication, shall be taken as the statements of the 
Company, and the Trustee or any Authenticating Agent assumes no responsibility 
for their correctness.  The Trustee makes no representations as to the 
validity or sufficiency of this Indenture, the Support Agreement or of
the Securities.  Neither the Trustee nor any Authenticating Agent shall be
accountable for the use or application by the Company of Securities or the
proceeds thereof.

SECTION 605.  May Hold Securities.

              The Trustee, any Authenticating Agent, any Paying Agent, any 
Security Registrar or any other agent of the Company, in its individual or any 
other capacity, may become the owner or pledgee of Securities and, subject to 
Sections 608 and 613, may otherwise deal with the Company with the same rights 
it would have if it were not Trustee, Authenticating Agent, Paying Agent, 
Security Registrar or such other agent.

SECTION 606.  Money Held in Trust.

              Money held by the Trustee in trust hereunder (including amounts 
held by the Trustee as Paying Agent) need not be segregated from other funds 
except to the extent required by law.  The Trustee shall be under no liability 
for interest on any money received by it hereunder except as otherwise agreed 
upon in writing with the Company.

SECTION 607.  Compensation and Reimbursement.

     The Company agrees

            (1)     to pay to the Trustee from time to time reasonable 
     compensation for all services rendered by it hereunder (which compensation 
     shall not be limited by any provision of law in regard to the compensation 
     of a trustee of an express trust);

            (2)     except as otherwise expressly provided herein, to 
     reimburse the Trustee upon its request for all reasonable expenses, 
     disbursements and advances incurred or made by the Trustee in accordance 
     with any provision of this Indenture

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     (including the reasonable compensation and the expenses and disbursements
     of its agents and counsel), except any such expense, disbursement or 
     advance as may be attributable to its negligence or bad faith; and

          (3)     to indemnify the Trustee for, and to hold it harmless 
     against, any loss, liability, damage, claim or expense, including taxes
     (other than taxes based upon or determined or measured by the income of
     the Trustee), incurred without gross negligence or bad faith on its part,
     arising out of or in connection with the acceptance or administration of
     the trust or trusts hereunder, including the costs and expenses of
     defending itself against any claim or liability in connection with the
     exercise or performance of any of its powers or duties hereunder.

          When the Trustee incurs expenses or renders services in connection 
with an Event of Default specified in Section 501(5) or Section 501(6), the 
expenses (including the reasonable charges and expenses of its counsel) and 
the compensation for the services are intended to constitute expenses of 
administration under any applicable federal or state bankruptcy, insolvency or 
other similar law.

          The provisions of this Section 607 shall survive this Indenture.

SECTION 608.   Disqualification; Conflicting Interests.

          The Trustee shall be disqualified only where such disqualification is
required by Section 310(b) of the Trust Indenture Act. Nothing shall prevent
the Trustee from filing with the Commission the application referred to in the
second to last paragraph of Section 310(b) of the Trust Indenture Act.

SECTION 609.   Corporate Trustee Required; Eligibility.

          There shall at all times be a Trustee hereunder which shall be 
eligible to act as Trustee under Section 310(a)(1) of the Trust Indenture Act 
having a combined capital and surplus of at least $50,000,000 subject to 
supervision or examination by federal or State authority.  If such corporation
publishes reports of condition at least annually, pursuant to law or to the 
requirements of said supervising or examining authority, then for the purposes
of this Section, the combined capital and surplus of such corporation shall be
deemed to be its combined capital and surplus as set forth in its most recent 
report of condition so published.  Neither the Company nor any Person directly
or indirectly controlling, controlled by, or under common control with the 
Company may serve as Trustee.  If at any time the Trustee shall cease to be 
eligible in accordance with the provisions of this Section, it shall resign 
immediately in the manner and with the effect hereinafter specified in this 
Article.

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SECTION 610.    Resignation and Removal; Appointment of Successor.

                (a)   No resignation or removal of the Trustee and no 
appointment of a successor Trustee pursuant to this Article shall become
effective until the acceptance of appointment by the successor Trustee in
accordance with the applicable requirements of Section 611.
                
                (b)   The Trustee may resign at any time with respect to the 
Securities of one or more series by giving written notice thereof to the 
Company.  If the instrument of acceptance by a successor Trustee required by 
Section 611 shall not have been delivered to the Trustee within 30 days after 
the giving of such notice of resignation, the resigning Trustee may petition 
any court of competent jurisdiction for the appointment of a successor Trustee 
with respect to the Securities of such series.

                (c)   The Trustee may be removed at any time with respect to 
the Securities of any series by Act of the Holders of a majority in principal 
amount of the Outstanding Securities of such series, delivered to the Trustee 
and to the Company.

                (d)   If at any time:

                (1)   the Trustee shall fail to comply with Section 310(b) of 
            the Trust Indenture Act after written request therefor by the 
            Company or by any Holder who has been a bona fide Holder of a 
            Security for at least six months; or

                (2)   the Trustee shall cease to be eligible under Section 609 
            and shall fail to resign after written request therefor by the 
            Company or by any such Holder of a Security who has been a bona 
            fide Holder of a Security for at least six months; or

                (3)   the Trustee shall become incapable of acting or shall be 
            adjudged a bankrupt or insolvent or a receiver of the Trustee or of 
            its property shall be appointed or any public officer shall take 
            charge or control of the Trustee or of its property or affairs for 
            the purpose of rehabilitation, conservation or liquidation;

then, in any such case, (i) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (ii) subject to Section 315(e) of
the Trust Indenture Act, any Holder who has been a bona fide Holder of a
Security for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the
removal of the Trustee with respect to all Securities and the appointment of a
successor Trustee or Trustees.

            (e) If the Trustee shall resign, be removed or become incapable of 
acting, or if a vacancy shall occur in the office of Trustee for any cause, 
with respect to the Securities of one or

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more series, the Company, by a Board Resolution, shall promptly appoint a
successor Trustee or Trustees with respect to the Securities of that or those
series (it being understood that any such successor Trustee may be appointed
with respect to the Securities of one or more or all of such series and that at
any time there shall be only one Trustee with respect to the Securities of any
particular series) and shall comply with the applicable requirements of Section
611.  If, within one year after such resignation, removal or incapability, or
the occurrence of such vacancy, a successor Trustee with respect to the
Securities of any series shall be appointed by Act of the Holders of a majority
in principal amount of the Outstanding Securities of such series delivered to
the Company and the retiring Trustee, the successor Trustee so appointed shall,
forthwith upon its acceptance of such appointment in accordance with the
applicable requirements of Section 611, become the successor Trustee with
respect to the Securities of such series and to that extent supersede the
successor Trustee appointed by the Company with respect to such Securities.  If
no successor Trustee with respect to the Securities of any series shall have
been so appointed by the Company or the Holders and accepted appointment in the
manner required by Section 611, any Holder who has been a bona fide Holder of a
Security of such series for at least six months may, on behalf of himself and
all others similarly situated, petition any court of competent jurisdiction for
the appointment of a successor Trustee with respect to the Securities of such
series.

               (f)   The Company shall give notice of each resignation and 
each removal of the Trustee with respect to the Securities of any series 
and each appointment of a successor Trustee with respect to the Securities of 
any series by mailing written notice of such event by first-class mail, postage 
prepaid, to all Holders of Securities of such series as their names and 
addresses appear in the Security Register.  Each notice shall include the name 
of the successor Trustee with respect to the Securities of such series and the 
address of its Corporate Trust Office.

SECTION 611.   Acceptance of Appointment by Successor.

               (a)   In case of the appointment hereunder of a successor 
Trustee with respect to all Securities, every such successor Trustee so 
appointed shall execute, acknowledge and deliver to the Company and to the
retiring Trustee an instrument accepting such appointment, and thereupon the
resignation or removal of the retiring Trustee shall become effective and such
successor Trustee, without any further act, deed or conveyance, shall become
vested with all the rights, powers, trusts and duties of the retiring Trustee;
but, on the request of the Company or the successor Trustee, such retiring
Trustee shall, upon payment of its charges, execute and deliver an instrument
transferring to such successor Trustee all the rights, powers and trusts of the
retiring Trustee and shall duly assign, transfer

                                    -53-
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and deliver to such successor Trustee all property and money held by such
retiring Trustee hereunder.

        (b)  In case of the appointment hereunder of a successor
Trustee with respect to the Securities of one or more (but not all) series, the
Company, the retiring Trustee and each successor Trustee with respect to the
Securities of one or more series shall execute and deliver an indenture
supplemental hereto wherein each successor Trustee shall accept such
appointment and which (1) shall contain such provisions as shall be necessary
or desirable to transfer and confirm to, and to vest in, each successor Trustee
all the rights, powers, trusts and duties of the retiring Trustee with respect
to the Securities of that or those series to which the appointment of such
successor Trustee relates, (2) if the retiring Trustee is not retiring with
respect to all Securities, shall contain such provisions as shall be deemed
necessary or desirable to confirm that all the rights, powers, trusts and
duties of the retiring Trustee with respect to the Securities of that or those
series as to which the retiring Trustee is not retiring shall continue to be
vested in the retiring Trustee, and (3) shall add to or change any of the
provisions of this Indenture as shall be necessary to provide for or facilitate
the administration of the trusts hereunder by more than one Trustee, it being
understood that nothing herein or in such supplemental indenture shall
constitute such Trustees co-trustees of the same trust and that each such
Trustee shall be trustee of a trust or trusts hereunder separate and apart from
any trust or trusts hereunder administered by any other such Trustee; and upon
the execution and delivery of such supplemental indenture the resignation or
removal of the retiring Trustee shall become effective to the extent provided
therein and each such successor Trustee, without any further act, deed or
conveyance, shall become vested with all the rights, powers, trusts and duties
of the retiring Trustee with respect to the Securities of that or those series
to which the appointment of such successor Trustee relates; but, on request of
the Company or any successor Trustee, such retiring Trustee shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates.

        (c)  Upon request of any such successor Trustee, the Company
shall execute any and all instruments for more fully and certainly vesting in
and confirming to such successor Trustee all such rights, powers and trusts
referred to in paragraph (a) or (b) of this Section, as the case may be.

        (d)  No successor Trustee shall accept its appointment unless
at the time of such acceptance such successor Trustee shall be qualified and
eligible under the Trust Indenture Act.

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   63

SECTION 612.   Merger, Conversion, Consolidation or Succession to Business.

               Any corporation into which the Trustee may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which the Trustee shall be a
party, or any corporation succeeding to all or substantially all the corporate
trust business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.  In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.

SECTION 613.   Preferential Collection of Claims Against Company.

               The Trustee shall comply with Section 311(a) of the
Trust Indenture Act, excluding any creditor relationship listed in Section
311(b) of the Trust Indenture Act.  A Trustee who has resigned or been removed
shall be subject to Section 311(a) of the Trust Indenture Act to the extent
indicated therein.

SECTION 614.   Appointment of Authenticating Agent.

               At any time when any of the Securities remain
Outstanding the Trustee may appoint an Authenticating Agent or Agents with
respect to one or more series of Securities which shall be authorized to act on
behalf of, and subject to the direction of, the Trustee to authenticate
Securities of such series issued upon exchange, registration of transfer or
partial redemption thereof or pursuant to Section 306, and Securities so
authenticated shall be entitled to the benefits of this Indenture and shall be
valid and obligatory for all purposes as if authenticated by the Trustee
hereunder.  Wherever reference is made in this Indenture to the authentication
and delivery of Securities by the Trustee or the Trustee's certificate of
authentication, such reference shall be deemed to include authentication and
delivery on behalf of the Trustee by an Authenticating Agent and a certificate
of authentication executed on behalf of the Trustee by an Authenticating Agent.
Each Authenticating Agent shall be acceptable to the Company and shall at all
times be a corporation organized and doing business under the laws of the
United States of America, any State thereof or the District of Columbia,
authorized under such laws to act as Authenticating Agent, having a combined
capital and surplus of not less than $50,000,000 and subject to supervision or
examination by federal or State authority.  If such Authenticating Agent
publishes reports of condition at least annually, pursuant to law or to the
requirements of said

                                    -55-
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supervising or examining authority, then for the purposes of this Section, the
combined capital and surplus of such Authenticating Agent shall be deemed to be
its combined capital and surplus as set forth in its most recent report of
condition so published.  If at any time an Authenticating Agent shall cease to
be eligible in accordance with the provisions of this Section, such
Authenticating Agent shall resign immediately in the manner and with the effect
specified in this Section.

               Any corporation into which an Authenticating Agent may be merged 
or converted or with which it may be consolidated, or any corporation resulting 
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or 
corporate trust business of an Authenticating Agent, shall continue to be an 
Authenticating Agent, provided such corporation shall be otherwise eligible 
under this Section, without the execution or filing of any paper or any 
further act on the part of the Trustee or the Authenticating Agent.

               An Authenticating Agent may resign at any time by giving written 
notice thereof to the Trustee and to the Company.  The Trustee may at any time 
terminate the agency of an Authenticating Agent by giving written notice 
thereof to such Authenticating Agent and to the Company.  Upon receiving such 
a notice of resignation or upon such a termination, or in case at any time such 
Authenticating Agent shall cease to be eligible in accordance with the 
provisions of this Section, the Trustee may appoint a successor Authenticating 
Agent which shall be acceptable to the Company and shall mail written notice 
of such appointment by first-class mail, postage prepaid, to all Holders of 
Securities of the series with respect to which such Authenticating Agent will 
serve, as their names and addresses appear in the Security Register. Any 
successor Authenticating Agent upon acceptance of its appointment hereunder
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.

               The Company agrees to pay to each Authenticating Agent from 
time to time reasonable compensation for its services under this Section.

               If an appointment with respect to one or more series is made 
pursuant to this Section, the Securities of such series may have endorsed
thereon, in addition to the Trustee's certificate of authentication, an
alternate certificate of authentication in the following form:

                                    -56-
   65

               Form of Authenticating Agent's
               Certificate of Authentication 

Dated:_________________

   This is one of the Securities of the series designated therein referred to in
the within-mentioned Indenture.


                                                  _________________________
                                                                 As Trustee


                                                  By____________________________
                                                         As Authenticating Agent


                                                  By____________________________
                                                            Authorized Signatory



                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.   Company to Furnish Trustee Names and Addresses of Holders.

               The Company will furnish or cause to be furnished to
the Trustee:

        (a)  semi-annually, not later than January 1 and July 1 in each
year, a list, in such form as the Trustee may reasonably require, of the names
and addresses of the Holders as of the preceding December 15 or June 15, as the
case may be; and

        (b)  at such other times as the Trustee may request in writing,
within 30 days after the receipt by the Company of any such request, a list of
similar form and content as of a date not more than 15 days prior to the time
such list is furnished;

provided, however, that so long as the Trustee is the Security Registrar, no
such list shall be required to be furnished.

SECTION 702.   Preservation of Information; Communications to Holders.

        (a)  The Trustee shall preserve, in as current a form as is
reasonably practicable, the names and addresses of Holders contained in the
most recent list furnished to the Trustee as provided in Section 701 and the
names and addresses of Holders received by the Trustee in its capacity as
Security Registrar.

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   66

The Trustee may destroy any list furnished to it as provided in Section 701
upon receipt of a new list so furnished.

                        (b)          If three or more Holders (herein referred
to as "applicants") apply in writing to the Trustee, and furnish to the Trustee
reasonable proof that each such applicant has owned a Security for a period of
at least six months preceding the date of such application, and such
application states that the applicants desire to communicate with other Holders
with respect to their rights under this Indenture or under the Securities and
is accompanied by a copy of the form of proxy or other communication which such
applicants propose to transmit, then the Trustee shall, within five Business
Days after the receipt of such application, at its election, either

                        (i)          afford such applicants access to the
            information preserved at the time by the Trustee in accordance with
            Section 702(a); or

                        (ii)         inform such applicants as to the
            approximate number of Holders whose names and addresses appear in
            the information preserved at the time by the Trustee in accordance
            with Section 702(a), and as to the approximate cost of mailing to
            such Holders the form of proxy or other communication, if any,
            specified in such application.

                        If the Trustee shall elect not to afford such
applicants access to such information, the Trustee shall, upon the written
request of such applicants, mail to each Holder whose name and address appears
in the information preserved at the time by the Trustee in accordance with
Section 702(a) a copy of the form of proxy or other communication which is
specified in such request, with reasonable promptness after a tender to the
Trustee of the material to be mailed and of payment, or provision for the
payment, of the reasonable expenses of mailing, unless within five days after
such tender the Trustee shall mail to such applicants and file with the
Commission, together with a copy of the material to be mailed, a written
statement to the effect that, in the opinion of the Trustee, such mailing would
be contrary to the best interest of the Holders or would be in violation of
applicable law.  Such written statement shall specify the basis of such
opinion.  If the Commission, after opportunity for a hearing upon the
objections specified in the written statement so filed, shall enter an order
refusing to sustain any of such objections or if, after the entry of an order
sustaining one or more of such objections, the Commission shall find, after
notice and opportunity for hearing, that all objections so sustained have been
met and shall enter an order so declaring, the Trustee shall mail copies of
such material to all such Holders with reasonable promptness after the entry of
such order and the renewal of such tender; otherwise the Trustee shall be
relieved of any obligation or duty to such applicants respecting their
application.

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   67

                        (c)          Every Holder of Securities, by receiving
and holding the same, agrees with the Company and the Trustee that neither the
Company nor the Trustee nor any agent of either of them shall be held
accountable by reason of the disclosure of any such information as to the names
and addresses of the Holders in accordance with Section 702(b), regardless of
the source from which such information was derived, and that the Trustee shall
not be held accountable by reason of mailing any material pursuant to a request
made under Section 702(b).

SECTION 703.     Reports by Trustee.

                        (a)          Within 60 days after May 15 of each year
commencing with the year 1995, the Trustee shall transmit by mail to all
Holders of Securities as provided in Section 313(c) of the Trust Indenture Act,
a brief report dated as of May 15, if required by and in compliance with
Section 313(a) of the Trust Indenture Act.

                        (b)          A copy of each such report shall, at the
time of such transmission to Holders, be filed by the Trustee with each stock
exchange upon which any Securities are listed, with the Commission and with the
Company.  The Company will notify the Trustee when any Securities are listed on
any stock exchange.

SECTION 704.     Reports by Company.
                 
                 The Company shall:

                        (1)          file with the Trustee, within 30 days
            after the Company is required to file the same with the Commission,
            copies of the annual reports and of the information, documents and
            other reports (or copies of such portions of any of the foregoing
            as the Commission may from time to time by rules and regulations
            prescribe) which the Company may be required to file with the
            Commission pursuant to Section 13 or Section 15(d) of the Exchange
            Act; or, if the Company is not required to file information,
            documents or reports pursuant to either of said Sections, then it
            shall file with the Trustee and the Commission, copies of the
            annual reports and of the information, documents and other reports
            (or copies of such portions of any of the foregoing as the
            Commission may from time to time by rules and regulations
            prescribed) which MCN may be required to file with the Commission
            pursuant to Section 13 or Section 15(d) of the Exchange Act.

                        (2)          file with the Trustee and the Commission,
            in accordance with rules and regulations prescribed from time to
            time by the Commission, such additional information, documents and
            reports with respect to compliance by the Company with the
            conditions and covenants of this Indenture as may be required from
            time to time by such rules and regulations;

                                    -59-
   68


                        (3)          transmit by mail to all Holders, as their
            names and addresses appear in the Security Register, (a)
            concurrently with furnishing the same to MCN's stockholders, MCN's
            annual report to stockholders, containing certified financial
            statements, and any other financial reports which MCN generally
            furnishes to its stockholders, and (b) within 30 days after the
            filing thereof with the Trustee, such summaries of any other
            information, documents and reports required to be filed by the
            Company pursuant to paragraphs (1) and (2) of this Section as may
            be required by rules and regulations prescribed from time to time
            by the Commission; and

                        (4)          furnish to the Trustee, on or before May 1
            of each year, a brief certificate from the principal executive
            officer, principal financial officer or principal accounting
            officer as to his or her knowledge of the Company's compliance with
            all conditions and covenants under this Indenture.  For purposes of
            this paragraph, such compliance shall be determined without regard
            to any period of grace or requirement of notice provided under this
            Indenture.  Such certificate need not comply with Section 102.



                                 ARTICLE EIGHT

                 CONSOLIDATION, MERGER, LEASE, SALE OR TRANSFER

SECTION 801.     When Company and MCN May Merge, Etc.

                        Neither the Company nor MCN shall consolidate with, or
merge with or into any other corporation (whether or not the Company or MCN, as
the case may be, shall be the surviving corporation), or sell, assign, transfer
or lease all or substantially all of its properties and assets as an entirety
or substantially as an entirety to any Person or group of affiliated Persons,
in one transaction or a series of related transactions, unless:

                        (1)          either the Company or MCN, as the case may
            be, shall be the continuing Person or the Person (if other than the
            Company or MCN) formed by such consolidation or with which or into
            which the Company or MCN is merged or the Person (or group of
            affiliated Persons) to which all or substantially all the
            properties and assets of the Company or MCN as an entirety or
            substantially as an entirety are sold, assigned, transferred or
            leased shall be a corporation (or constitute corporations)
            organized and existing under the laws of the United States of
            America or any State thereof or the District of Columbia and shall
            expressly assume, in the case of the Company by an indenture
            supplemental hereto, executed and delivered to the Trustee, in form
            satisfactory to the Trustee, all the obligations of

                                    -60-
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              the Company under the Securities and this Indenture and in the
              case of MCN, the performance of every covenant of this Indenture
              on the part of MCN, as applicable, and all the obligations under
              the Support Agreement to be performed or observed; and

                    (2)   immediately before and after giving effect to such
              transaction or series of related transactions, no Event of
              Default, and no Default, shall have occurred and be continuing.

        Each of the Company and MCN covenants and agrees that if,  upon its
consolidation with or merger into any other corporation, or upon any
consolidation or merger of any other corporation with or into it, or upon any
sale or conveyance of all or substantially all of its property and assets to
any other corporation, any of its property or any property of any Subsidiary or
any Indebtedness issued by any Subsidiary owned by it or by any other
Subsidiary immediately prior thereto would thereupon become subject to any
mortgage, security interest, pledge, lien or other encumbrance not permitted by
Section 1010 hereof, prior to or concurrently with such consolidation, merger,
sale or conveyance, it will effectively secure the Securities then Outstanding
(equally and ratably with (or prior to) any other Indebtedness of or guaranteed
by it or such Subsidiary then entitled thereto) by a direct lien, on such of
its property or such property of a Subsidiary or such other Indebtedness issued
by a Subsidiary, prior to all liens other than any theretofore existing
thereon.

SECTION 802.  Opinion of Counsel.

        The Company or MCN, as applicable, shall deliver to the Trustee prior
to the proposed transaction(s) covered by Section 801 an Officer's Certificate
and an Opinion of Counsel stating that the transaction(s) and such supplemental
indenture comply with this Indenture and that all conditions precedent to the
consummation of the transaction(s) under this Indenture have been met.

SECTION 803.  Successor Corporation Substituted.

              Upon any consolidation by the Company or MCN with or merger by 
the Company or MCN into any other corporation or any lease, sale, assignment, 
or transfer of all or substantially all of the property and assets of the 
Company or MCN in accordance with Section 801, the successor corporation
formed by such consolidation or into which the Company or MCN is merged or the
successor corporation or affiliated group of corporations to which such lease,
sale, assignment, or transfer is made shall succeed to, and be substituted for,
and may exercise every right and power of, the Company or MCN, as applicable,
under this Indenture or the Support Agreement with the same effect as if such
successor corporation or corporations had been named as the

                                    -61-
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Company or MCN, as applicable, herein, and thereafter, except in the case of a
lease, the predecessor corporation or corporations shall be relieved of all
obligations and covenants under this Indenture and the Securities and, in the
case of MCN, the Support Agreement, and in the event of such conveyance or
transfer, except in the case of a lease, any such predecessor corporation may
be dissolved and liquidated.




                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

SECTION 901.   Supplemental Indentures Without Consent of Holders.

               Without notice to or the consent of any Holders, the Company, 
when authorized by a Board Resolution, and the Trustee, at any time and from 
time to time, may enter into one or more indentures supplemental hereto, in 
form satisfactory to the Trustee, for any of the following purposes:

                        (1)   to evidence the succession of another
            corporation to the Company or MCN and the assumption by any such
            successor of the covenants of the Company or MCN, as the case may
            be, herein and in the Securities; or

                        (2)   to add to the covenants of the Company or MCN for 
            the benefit of the Holders of all or any series of Securities (and 
            if such covenants are to be for the benefit of less than all series 
            of Securities, stating that such covenants are expressly being 
            included solely for the benefit of such series) or to surrender 
            any right or power herein conferred upon the Company; or

                        (3)   to add any additional Events of Default with 
            respect to all or any series of Securities; or

                        (4)   to add or change any of the provisions of this 
            Indenture to such extent as shall be necessary to permit or
            facilitate the issuance of Securities in bearer form, registrable
            or not registrable as to principal, and with or without interest
            coupons; or

                        (5)   to change or eliminate any of the provisions of 
            this Indenture, provided that any such change or elimination shall 
            become effective only when there is no Security Outstanding of any 
            series created prior to the execution of such supplemental 
            indenture which is entitled to the benefit of such provision; or

                                    -62-
   71
               (6)   to secure the Securities; or

               (7)   to establish the form or terms of Securities of  any
         series as permitted by Sections 201 and 301; or

               (8)   to evidence and provide for the acceptance of appointment
         hereunder by a successor Trustee with respect to the Securities of one
         or more series and to add to or change any of the provisions of this
         Indenture as shall be necessary to provide for or facilitate the
         administration of the trusts hereunder by more than one Trustee,
         pursuant to the requirements of Section 611(b); or

               (9)   to cure any ambiguity, defect or inconsistency or to
         correct or supplement any provision herein which may be inconsistent
         with any other provision herein; or

               (10)  to make any change that does not materially adversely
         affect the interests of the Holders of Securities of any series.

               Upon request of the Company, accompanied by a Board Resolution 
authorizing the execution of any such supplemental indenture, and upon receipt 
by the Trustee of the documents described in (and subject to the last sentence 
of) Section 903, the Trustee shall join with the Company in the execution of 
any supplemental indenture authorized or permitted by the terms of this 
Indenture.

SECTION 902.   Supplemental Indentures with Consent of Holders.

               With the written consent of the Holders of a majority in 
principal amount of the Outstanding Securities of each series affected by
such supplemental indenture, by Act of said Holders delivered to the Company
and the Trustee, the Company, when authorized by a Board Resolution, and the
Trustee shall, subject to Section 903, enter into an indenture or indentures
supplemental hereto for the purpose of adding any provisions to or changing in
any manner or eliminating any of the provisions of this Indenture or of
modifying in any manner the rights of the Holders of Securities of such series
under this Indenture; provided, however, that no such supplemental indenture
shall, without the consent of the Holder of each Outstanding Security affected
thereby,

                     (1)   change the Stated Maturity of the principal of, 
               or any installment of principal of or interest on, any
               Security,  or reduce the principal amount thereof or the rate
               of interest  thereon or any premium payable upon the redemption
               thereof or  extend the time for payment thereof, or reduce the
               amount of the principal of an Original Issue Discount Security
               that would be due and payable upon a

                                    -63-
   72
         declaration of acceleration of the Maturity thereof pursuant to
         Section 502, or change any Place of Payment where, or the coin or
         currency in which, any Security or any premium or the interest thereon
         is payable, or impair the right to institute suit for the enforcement
         of any such payment on or after the Stated Maturity thereof (or, in
         the case of redemption, on or after the Redemption Date);

              (2)  reduce the percentage in principal amount of the
         Outstanding Securities of any series, the consent of whose Holders is
         required for any such supplemental indenture, or the consent of whose
         Holders is required for any waiver of compliance with certain
         provisions of this Indenture or Defaults or Events of Default
         hereunder and their consequences provided for in this Indenture; or

               (3) change the redemption provisions (including
         Article Eleven) hereof in a manner adverse to such  Holder; or
                    
               (4) modify any of the provisions of this Section or
         Section 513, except to increase any such percentage or to provide that
         certain other provisions of this Indenture cannot be modified or
         waived without the consent of the Holder of each Outstanding Security
         affected thereby; provided, however, that this clause shall not be
         deemed to require the consent of any Holder with respect to changes in
         the references to "the Trustee" and concomitant changes in this
         Section, or the deletion of this proviso, in accordance with the
         requirements of Sections 611(b) and 901(8).

A supplemental indenture which changes or eliminates any covenant or other
provisions of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such
covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

               It shall not be necessary for any Act of Holders under
this Section to approve the particular form of any proposed supplemental
indenture, but it shall be sufficient if such Act shall approve the substance
thereof.

SECTION 903.   Execution of Supplemental Indentures.

               The Trustee shall sign any supplemental indenture
authorized pursuant to this Article, subject to the last sentence of this
Section 903.  In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive, and

                                    -64-
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(subject to Section 601) shall be fully protected in relying
upon, an Officer's Certificate and an Opinion of Counsel stating
that the execution of such supplemental indenture is authorized
or permitted by this Indenture.  The Trustee may, but shall not
be obligated to, enter into any such supplemental indenture
which affects the Trustee's own rights, duties or immunities
under this Indenture or otherwise.

SECTION 904.   Effect of Supplemental Indentures.

               Upon the execution of any supplemental indenture under
this Article, this Indenture shall be modified in accordance therewith, and
such supplemental indenture shall form a part of this Indenture for all
purposes; and every Holder of Securities theretofore or thereafter
authenticated and delivered hereunder shall be bound thereby.

SECTION 905.   Conformity with Trust Indenture Act.

               Every supplemental indenture executed pursuant
to this Article shall conform to the requirements of the Trust
Indenture Act as then in effect.


SECTION 906.   Reference in Securities to Supplemental Indentures.

               Securities of any series authenticated and delivered
after the execution of any supplemental indenture pursuant to this Article may,
and shall if required by the Trustee, bear a notation in form approved by the
Trustee as to any matter provided for in such supplemental indenture.  If the
Company shall so determine, new Securities of any series so modified as to
conform, in the opinion of the Trustee and the Company, to any such
supplemental indenture may be prepared and executed by the Company and
authenticated and delivered by the Trustee in exchange for Outstanding
Securities of such series.



                                  ARTICLE TEN

                                   COVENANTS

SECTION 1001.  Payments of Securities.

               With respect to each series of Securities, the Company
will duly and punctually pay the principal of (and premium, if any) and
interest on such Securities in accordance with their terms and this Indenture,
and will duly comply with all the other terms, agreements and conditions
contained in, or made in the Indenture for the benefit of, the Securities of
such series.

                                    -65-
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SECTION 1002.  Maintenance of Office or Agency.

               The Company will maintain an office or agency in each Place of 
Payment where Securities may be surrendered for registration of transfer or 
exchange or for presentation for payment, where notices and demands to or upon 
the Company in respect of the Securities and this Indenture may be served.  
The Company will give prompt written notice to the Trustee of the
location, and any change in location, of such office or agency.  If at any time
the Company shall fail to maintain any such required office or agency or shall
fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the address of the 
Trustee as set forth in Section 105 hereof.

               The Company may also from time to time designate one or more 
other offices or agencies where the Securities may be presented or surrendered 
for any or all such purposes and may from time to time rescind such
designations.  The Company will give prompt written notice to the Trustee of
any such designation or rescission and of any change in the location of any
such other office or agency.

               Unless otherwise set forth in, or pursuant to, a Board 
Resolution or Indenture supplemental hereto with respect to a series of
Securities, the Company hereby initially designates the office of NBD Bank,
N.A., Bond Processing Department located in 9000 Haggerty Road, Belleville, MI
48111, as such office of the Company.

SECTION 1003.  Corporate Existence.

               Subject to Article 8 hereof, the Company will do or
cause to be done all things necessary to preserve and keep in full force and
effect its corporate existence and that of each of its Subsidiaries and the
rights (charter and statutory) of the Company and its Subsidiaries; provided,
however, that (a) the Company shall not be required to preserve any such right,
license or franchise or the corporate existence of any of its Subsidiaries if
the Board of Directors, or the board of directors of the Subsidiary concerned,
as the case may be, shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company or any of its
Subsidiaries and that the loss thereof is not materially disadvantageous to the
Holders, and (b) nothing herein contained shall prevent any Subsidiary of the
Company from liquidating or dissolving, or merging into, or consolidating with
the Company (provided that the Company shall be the continuing or surviving
corporation) or with any one or more Subsidiaries if the Board of Directors or
the board of directors of the Subsidiary concerned, as the case may be, shall
so determine.

                                    -66-
   75


        Subject to Article 8 hereof, (a) MCN will do or cause to be done all
things necessary to preserve and keep in full force and effect its corporate
existence and that of its Significant Subsidiaries and its rights (charter and
statutory) and those of its Significant Subsidiaries provided, however, that
MCN shall not be required to preserve any such right, license or franchise or
the corporate existence of its Significant Subsidiaries if in the judgment of
MCN, the preservation thereof is no longer desirable in the conduct of the
business and that the loss thereof is not materially disadvantageous to the
Holders, and (b) MCN will continue to own, directly or indirectly all of the
outstanding common stock of any Significant Subsidiary it owns as of the date
of this Indenture; provided, however, that MCN may sell or otherwise transfer
any or all of the outstanding common stock of any such Significant Subsidiary
if two nationally recognized statistical rating organizations confirm in
writing that their ratings for the Securities would remain the same after such
sale or transfer.

SECTION 1004.  Payment of Taxes and Other Claims.

        Each of the Company and MCN will pay or discharge, or cause to be paid
or discharged, before the same shall become delinquent, (1) all material taxes,
assessments and governmental charges levied or imposed upon the Company, MCN or
any Subsidiary or upon the income, profits or property of the Company, MCN or
any Subsidiary, and (2) all lawful claims for labor, materials and supplies
which, if unpaid, might by law become a material lien upon the property of the
Company, MCN or any Subsidiary; provided, however, that neither the Company nor
MCN shall be required to pay or discharge or cause to be paid or discharged any
such tax, assessment, charge or claim whose amount, applicability or validity
is being contested in good faith by appropriate proceedings and for which
adequate provision has been made.

SECTION 1005.  Maintenance of Properties.

        Each of the Company and MCN will cause all material properties used or
useful in the conduct of its business or the business of any of their
Subsidiaries to be maintained and kept in good condition, repair and working
order (normal wear and tear excepted) and supplied with all necessary equipment
and will cause to be made all necessary repairs, renewals, replacements,
betterments and improvements thereof, all as in the judgment of the Company or
MCN, as the case may be, may be necessary, so that the business carried on in
connection therewith may be properly and advantageously conducted at all times;
provided, however, that nothing in this Section shall prevent the Company or
MCN from discontinuing the operation or maintenance of any of such properties,
or disposing of any of them, if such discontinuance or disposal is, in the
judgment of the Board of Directors or of

                                    -67-
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the board of directors of the Subsidiary concerned, as the case may be,
desirable in the conduct of the business of the Company, MCN or any Subsidiary
of the Company or MCN and not materially disadvantageous to the Holders.

SECTION 1006.   Compliance Certificates.

                (a)   The Company shall deliver to the Trustee within 120 days 
            after the end of each fiscal year of the Company (which fiscal year
            currently ends on December 31), an Officer's Certificate stating 
            whether or not the signer knows of any Default or Event of Default 
            by the Company that occurred prior to the end of the fiscal year 
            and is then continuing.  If the signer does know of such a Default 
            or Event of Default, the certificate shall describe each such 
            Default or Event of Default and its status and the specific section 
            or sections of this Indenture in connection with which such Default
            or Event of Default has occurred.  The Company shall also promptly 
            notify the Trustee in writing should the Company's fiscal year be 
            changed so that the end thereof is on any date other than the date 
            on which the Company's fiscal year currently ends.  The certificate 
            need not comply with Section 102 hereof.

                (b)   The Company shall deliver to the Trustee, within 10 days 
            after the occurrence thereof, notice of any acceleration which with 
            the giving of notice and the lapse of time would be an Event of 
            Default within the meaning of Section 501(4) hereof.

                (c)   The Company shall deliver to the Trustee forthwith upon 
            becoming aware of a Default or Event of Default (but in no event 
            later than 10 days after the occurrence of each Default or Event of 
            Default that is continuing), an Officer's Certificate setting forth 
            the details of such Default or Event of Default and the action that
            the Company proposes to take with respect thereto and the specific 
            section or sections of this Indenture in connection with which such
            Default or Event of Default has occurred.

SECTION 1007.   Commission Reports.

                (a)  The Company shall file with the Trustee, within 30 days 
            after it files them with the Commission, copies of the quarterly 
            and annual reports and of the information, documents, and other 
            reports (or copies of such portions of any of the foregoing as the 
            Commission may by rules and regulations prescribe) which the
            Company is required to file with the Commission pursuant to Section
            13 or 15(d) of the Exchange Act.  If the Company is not subject to
            the requirement of such Section 13 or 15(d) of the Exchange Act,
            the Company shall file with the Trustee, within 30 days

                                    -68-
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                after it would have been required to file such
                information with the Commission, copies of the quarterly and
                annual reports and of the information, documents, and other
                reports (or copies of such portions of any of the foregoing as
                the Commission may by rules and regulations prescribe) which
                MCN is required to file with the Commission pursuant to Section
                13 or 15(d) of the Exchange Act.

                        (b)    So long as the Securities remain outstanding and
                the Company is required to furnish annual or quarterly reports
                to its stockholders pursuant to the Exchange Act, the Company
                shall  cause its (and, if the Support Agreement is still in
                effect, MCN's) annual report to stockholders and any other
                financial  reports, if such reports are required to be provided
                by the Exchange Act, furnished by it (or MCN as the case may
                be) to stockholders generally, to be mailed  to the Holders at
                their addresses appearing in the register of  Securities
                maintained by the Security Registrar in each case at  the time
                of such mailing or furnishing to stockholders.  If the  Company
                is not required to furnish annual or quarterly reports to its
                stockholders pursuant to the Exchange Act, the Company shall 
                cause MCN's financial statements (or, if the Support Agreement
                is no longer in effect, the Company's financial statements),
                including any notes thereto  and, with respect to annual
                reports, an auditors' report by an  accounting firm of
                established national reputation and a  "Management's Discussion
                and Analysis of Financial Condition and  Results of
                Operations," to be so filed with the Trustee and  mailed to the
                Holders within 90 days after the end of each of  MCN's (or the
                Company's as the case may be) fiscal years and within 45 days
                after the end of each of  the first three quarters of each
                fiscal year.

                        (c)    The Company shall provide the Trustee with a
                sufficient number of copies of all reports and other documents
                and information that the Company may be required to deliver to
                the Holders under this Section 1007.

SECTION 1008.   Waiver of Stay, Extension or Usury Laws.

                Each of the Company and MCN covenants (to the extent that it 
may lawfully do so) that it will not at any time insist upon, or plead, or in 
any manner whatsoever claim, and will actively resist any and all efforts
to be compelled to take the benefit or advantage of, any stay or extension law
or any usury law or other law, which would prohibit or forgive the Company from
paying all or any portion of the principal of and/or interest on the Securities
as contemplated herein, wherever enacted, now or at any time hereafter in
force, or which may affect the covenants or the performance of this Indenture;
and (to the extent that it may lawfully do so) each of the Company and MCN
hereby expressly waives all benefit or advantage of any such law, and covenants
that it will not hinder, delay or impede the execution of any power herein
granted to the Trustee, but will suffer and permit the execution of every such
power as though no such law had been enacted.

                                    -69-
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SECTION 1009.  Money for Securities Payments to Be Held in Trust.

               If the Company shall at any time act as its own Paying Agent 
with respect to any series of Securities, it will, on or before each due
date of the principal of (and premium, if any) or interest on any of the
Securities of that series, segregate and hold in trust for the benefit of the
Persons entitled thereto a sum sufficient to pay the principal (and premium, if
any) or interest so becoming due until such sums shall be paid to such Persons
or otherwise disposed of as herein provided and will promptly notify the
Trustee of its action or failure so to act.

               Whenever the Company shall have one or more Paying Agents for 
any series of Securities, it will, prior to each due date of the principal of 
(and premium, if any) or interest on any Securities of that series, deposit 
with a Paying Agent a sum sufficient to pay the principal (and premium, if any) 
or interest so becoming due, such sum to be held in trust for the benefit of 
the Persons entitled to such principal, premium or interest, and (unless such 
Paying Agent is the Trustee) the Company will promptly notify the Trustee of 
its action or failure to so act.

               The Company will cause each Paying Agent for any series of 
Securities (other than the Trustee) to execute and deliver to the Trustee an
instrument in which such Paying Agent shall agree with the Trustee, subject to
the provisions of this Section, that such Paying Agent will:

               (1)   hold all sums held by it for the payment of the principal
         of (and premium, if any) or interest on  Securities of that series in
         trust for the benefit of the  Persons entitled thereto until such sums
         shall be paid to such  Persons or otherwise disposed of as herein
         provided;

               (2)   give the Trustee notice of any default by the  Company
         (or any other obligor upon the Securities of that  series) in the
         making of any payment of principal (and premium,  if any) or interest
         on the Securities of that series; and

               (3)   at any time during the continuance of any such  default,
        upon the written request of the Trustee, forthwith pay to the Trustee
        all sums so held in trust by such Paying  Agent.

               The Company may at any time, for the purpose of obtaining the 
satisfaction and discharge of this Indenture or for any other purpose, pay, or 
by Company Order direct any Paying Agent to pay, to the Trustee all sums held 
in trust by the Company or such Paying Agent, such sums to be held by the 
Trustee upon the same trusts as those upon which such sums were held by the 
Company or such Paying Agent; and, upon such payment by any

                                    -70-
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Paying Agent to the Trustee, such Paying Agent shall be released from all
further liability with respect to such money.

            Any money deposited with the Trustee or any Paying Agent, or then 
held by the Company, in trust for the payment of the principal of (and premium, 
if any) or interest on any Security of any series and remaining unclaimed for 
two years after such principal (and premium, if any) or interest has become due 
and payable shall be paid to the Company on Company Request, or (if then held 
by the Company) shall be discharged from such trust; and the Holder of such 
Security shall thereafter, as an unsecured general creditor, look only to the 
Company for payment thereof, and all liability of the Trustee or such Paying 
Agent with respect to such trust money, and all liability of the Company as 
trustee thereof, shall thereupon cease; provided, however, that the Trustee of 
such Paying Agent, before being required to make any such repayment, may at the 
expense of the Company cause to be published once, in a newspaper published in 
the English language, customarily published on each Business Day and of 
general circulation in New York, New York, notice that such money remains 
unclaimed and that, after a date specified therein, which shall not be less 
than 30 days from the date of such publication, any unclaimed balance of such 
money then remaining will be repaid to the Company.

SECTION 1010.  Limitation on Liens.

               Neither the Company nor MCN will (nor will MCN permit any 
Significant Subsidiary to) create, incur, or suffer to exist any Lien in,
of or on the property of the Company, MCN  or any of their Subsidiaries,
except:

            (i)         Liens for taxes, assessments or governmental charges or
                        levies on its property if the same shall not at the
                        time be delinquent or thereafter can be paid without
                        penalty, or are being contested in good faith and by
                        appropriate proceedings and for which adequate reserves
                        in accordance with generally accepted principles of
                        accounting shall have been set aside on its books.

            (ii)        Liens imposed by law, such as carriers', warehousemen's
                        and mechanics' liens and other similar liens arising in
                        the ordinary course of business which secure payment of
                        obligations not more than 60 days past due or which are
                        being contested in good faith by appropriate
                        proceedings and for which adequate reserves shall have
                        been set aside on its books.

            (iii)       Liens arising out of pledges or deposits under worker's
                        compensation laws, unemployment

                                    -71-
   80

                        insurance, old age pensions, or other social security 
                        or retirement benefits, or similar legislation.

            (iv)        Utility easements, building restrictions and such other
                        encumbrances or charges against real property as are of
                        a nature generally existing with respect to properties
                        of a similar character and which do not in any material
                        way affect the marketability of the same or interfere
                        with the use thereof in the business of the Company,
                        MCN or their Subsidiaries, as the case may be.

            (v)         Liens on the capital stock, partnership interest, or
                        other evidence of ownership of any Subsidiary or such
                        Subsidiary's assets that secure Project Finance
                        Indebtedness for such Subsidiary.

           (vi)         Liens arising in connection with first mortgage bonds
                        issued by any Significant Subsidiary pursuant to any
                        first mortgage indenture in effect as of the date of
                        this Indenture, as such indenture may be supplemented
                        from time to time.


          (vii)         Purchase money liens upon or in property now owned or
                        hereafter acquired in the ordinary course of business
                        (consistent with the Company's or MCN's business
                        practices, as the case may be) to secure (A) the
                        purchase price of such property or (B) Indebtedness
                        incurred solely for the purpose of financing the
                        acquisition, construction, or improvement of any such
                        property to be subject to such liens, or Liens existing
                        on any such property at the time of acquisition, or
                        extensions, renewals, or replacements of any of the
                        foregoing for the same or a lesser amount; provided
                        that no such lien shall extend to or cover any property
                        other than the property being acquired, constructed, or
                        improved and replacements, modifications, and proceeds
                        of such property, and no such extension, renewal, or
                        replacement shall extend to or cover any property not
                        theretofore subject to the Lien being extended,
                        renewed, or replaced.

          (viii)        Liens existing on the date Securities are first issued
                        hereunder.

            (ix)        Liens for no more than 90 days arising from a
                        transaction involving accounts receivable of the
                        Company or MCN, as the case may be (including the sale
                        of such accounts receivable), where such

                                    -72-
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                        accounts receivable arose in the ordinary course of 
                        the Company's or MCN's business, as the case may be.

SECTION 1011.  Limitation on Sale and Leaseback Transactions.

               Neither the Company nor MCN will itself, or will they permit 
any Subsidiary to, enter into any arrangement with any bank, insurance
company or other lender or investor (not including the Company, MCN or any
Subsidiary), or to which such lender or investor (other than the Company, MCN
or a Subsidiary) is a party, providing for the leasing by the Company, MCN or
such Subsidiary for a period, including renewals, in excess of three years of
any real property located within the United States of America which has been
owned by the Company, MCN or such Subsidiary, as the case may be, for more
than six months and which has been or is to be sold or transferred by the
Company, MCN or such Subsidiary, as the case may be, to such lender or investor
or to any person to whom funds have been or are to be advanced by such lender
or investor on the security of such real property (a "Sale and Leaseback
Transaction") unless either:

               (a)   the Company, MCN or such Subsidiary, as the case may be, 
            could create indebtedness secured by a lien pursuant to Section 
            1010 hereof on the real property to be leased, in an amount equal 
            to the Value of such Sale and Leaseback Transaction, without 
            equally and ratably securing the Securities; or

               (b)   the Company or MCN, as the case may be, within six months 
            after the sale or transfer shall have been made, applies an amount 
            equal to the greater of (i) the net proceeds of the sale of the 
            real property leased pursuant to such arrangement or (ii) the fair 
            market value of the real property so leased at the time of entering 
            into such arrangement (as determined by the Board of Directors of 
            the Company or MCN, as the case may be) to the retirement of the 
            Securities and other obligations of the issuer ranking on a parity 
            with the Securities.  No retirement referred to in this paragraph 
            (b) may be effected by payment at maturity or pursuant to any 
            mandatory sinking fund or prepayment provision.

SECTION 1012.  Waiver of Certain Covenants.

               The Company and MCN may omit in any particular instance to 
comply with any covenant or condition set forth in Sections 1010 or 1011
hereof, if before or after the time for such compliance the Holders of not less
than a majority in principal amount of the Securities at the time Outstanding
of each series which is affected thereby, shall, by consent in writing of such
Holders, either waive such compliance in such instance or

                                    -73-
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generally waive compliance with such covenant or condition, but no such waiver
shall extend to or affect such covenant or conditions except to the extent so
expressly waived, and, until such waiver shall become effective, the
obligations of the Company and MCN and the duties of the Trustee in respect of
any such covenant or condition shall remain in full force and effect.


SECTION 1013.   Support Agreement.

                Each of the Company and MCN covenants and agrees for the 
benefit of each series of Securities that (a) it will perform its respective 
obligations under the Support Agreement and (b) it will not agree to any 
amendment or termination of the Support Agreement as in effect on the date
of this Indenture, except in accordance with the terms of the Support Agreement
as in effect on the date of this Indenture.

                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

SECTION 1101.   Applicability of Article.

                Securities of any series which are redeemable before their 
Stated Maturity shall be redeemable in accordance with their terms and
(except as otherwise specified as contemplated by Section 301 for Securities of
any series) in accordance with this Article.

SECTION 1102.   Election to Redeem; Notice to Trustee.

                The election of the Company to redeem any Securities shall 
be evidenced by a Board Resolution.  In case of any redemption at the
election of the Company of less than all the Securities of any series, the
Company shall, at least 45 days prior to the Redemption Date fixed by the
Company (unless a shorter notice shall be satisfactory to the Trustee), notify
the Trustee of such Redemption Date and of the principal amount of Securities
of such series to be redeemed.  In the case of any redemption of Securities
prior to the expiration of any restriction on such redemption provided in the
terms of such Securities or elsewhere in this Indenture, the Company shall
furnish the Trustee with an Officer's Certificate evidencing compliance with
such restriction.

SECTION 1103.   Selection by Trustee of Securities to Be Redeemed.

                If less than all the Securities of any series are to be 
redeemed, the particular Securities to be redeemed shall be selected not more
than 90 days prior to the Redemption Date by the Trustee, from the Outstanding
Securities of such series not

                                    -74-
   83
previously called for redemption, substantially pro rata, by lot or by any
other method as the Trustee considers fair and appropriate and that complies
with the requirements of the principal national securities exchange, if any, on
which such Securities are listed, and which may provide for the selection for
redemption of portions (equal to the minimum authorized denomination for
Securities of that series or any integral multiple thereof) of the principal
amount of Securities of such series of a denomination larger than the minimum
authorized denomination for Securities of that series; provided that in case
the Securities of such series have different terms and maturities, the
Securities to be redeemed shall be selected by the Company and the Company
shall give notice thereof to the Trustee.

        The Trustee shall promptly notify the Company in writing of the
Securities selected for redemption and, in the case of any Securities selected
for partial redemption, the principal amount thereof to be redeemed.

        For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of the Securities shall
relate, in the case of any Securities redeemed or to be redeemed only in part,
to the portion of the principal amount of such Securities which has been or is
to be redeemed.

SECTION 1104.    Notice of Redemption.

                 Notice of redemption shall be given by first-class
mail, postage prepaid, mailed not less than 30 nor more than 45 days prior to
the Redemption Date, to each Holder of Securities to be redeemed, at his
address appearing in the Security Register.

                 All notices of redemption shall state:

                 (1)   the Redemption Date;

                 (2)   the Redemption Price;

                 (3)   if less than all the Outstanding Securities
            of any series are to be redeemed, the identification (and, in the
            case of partial redemption, the principal amounts) of the
            particular Securities to be redeemed;

                 (4)   that on the Redemption Date the Redemption
            Price will be come due and payable upon each such Security to be
            redeemed and, if applicable, that interest thereon will cease to
            accrue on and after said date;

                                    -75-
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                (5)   the place or places where such Securities are to
         be surrendered for payment of the Redemption Price;

                (6)   that the redemption is for a sinking fund, if 
         such is the case; and

                (7)   the CUSIP number, if any, of the Securities to 
         be redeemed; and

                (8)   unless otherwise provided as to a particular
         series of Securities, if at the time of publication or mailing of any
         notice of redemption the Company shall not have deposited with the
         Trustee or Paying Agent and/or irrevocably directed the Trustee or
         Paying Agent to apply, from money held by it available to be used for
         the redemption of Securities, an amount in cash sufficient to redeem
         all of the Securities called for redemption, including accrued
         interest to the Redemption Date, such notice shall state that it is
         subject to the receipt of the redemption moneys by the Trustee or
         Paying Agent before the Redemption Date (unless such redemption is
         mandatory) and such notice shall be of no effect unless such moneys
         are so received before such date.

                Notice of redemption of Securities to be redeemed at the 
election of the Company shall be given by the Company or, at the Company's
request, by the Trustee in the name and at the expense of the Company.

SECTION 1105.   Deposit of Redemption Price.

                Prior to any Redemption Date, the Company shall deposit
with the Trustee or with a Paying Agent (or, if the Company is acting as its
own Paying Agent, segregate and hold in trust as provided in Section 1009) an
amount of money sufficient to pay the Redemption Price of, and (except if the
Redemption Date shall be an Interest Payment Date) accrued interest on, all the
Securities which are to be redeemed on that date.

SECTION 1106.   Securities Payable on Redemption Date.

                Notice of redemption having been given as aforesaid,
the Securities so to be redeemed shall, on the Redemption Date, become due and
payable at the Redemption Price therein specified, and from and after such date
(unless the Company shall default in the payment of the Redemption Price and
accrued interest) such Securities shall cease to bear interest.  Upon surrender
of any such Security for redemption in accordance with said notice, such
Security shall be paid by the Company at the Redemption Price, together with
accrued interest to the Redemption Date; provided, however, that installments
of interest whose Stated Maturity is on or prior to the Redemption Date shall
be payable to the

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Holders of such Securities, or one or more Predecessor Securities, registered
as such at the close of business on the relevant Regular or Special Record
Dates according to their terms and the provisions of Section 307.

         If any Security called for redemption shall not be so
paid upon surrender thereof for redemption, the principal (and premium, if any)
shall, until paid, bear interest from the Redemption Date at the rate
prescribed therefor in the Security.

SECTION 1107.   Securities Redeemed in Part.

         Any Security which is to be redeemed only in part shall
be surrendered at an office or agency of the Company at a Place of Payment
therefor (with, if the Company or the Trustee so requires, due endorsement by,
or a written instrument of transfer in form satisfactory to the Company and the
Trustee duly executed by, the Holder thereof or his attorney duly authorized in
writing), and the Company shall execute, and the Trustee shall authenticate and
deliver to the Holder of such Security without service charge, a new Security
or Securities of the same series and Stated Maturity, of any authorized
denomination as requested by such Holder, in aggregate principal amount equal
to and in exchange for the unredeemed portion of the principal of the Security
so surrendered.


                                 ARTICLE TWELVE

                                 SINKING FUNDS

SECTION 1201.   Applicability of Article.

         The provisions of this Article shall be applicable to
any sinking fund for the retirement of Securities of a series, except as
otherwise specified as contemplated by Section 301 for Securities of such
series.

         The minimum amount of any sinking fund payment provided
for by the terms of Securities of any series is herein referred to as a
"MANDATORY SINKING FUND PAYMENT," and any payment in excess of such minimum
amount provided for by the terms of Securities of any series is herein referred
to as an "OPTIONAL SINKING FUND PAYMENT."  If provided for by the terms of
Securities of any series, the cash amount of any sinking fund payment may be
subject to reduction as provided in Section 1202.  Each sinking fund payment
shall be applied to the redemption of Securities of any series as provided for
by the terms of Securities of such series.

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SECTION 1202.    Satisfaction of Sinking Fund Payments with
                 Securities.

                 The Company (1) may deliver Securities of a series
(other than any Securities previously called for redemption) and (2) may apply
as a credit Securities of a series which have been redeemed either at the
election of the Company pursuant to the terms of such Securities or through the
application of permitted optional sinking fund payments pursuant to the terms
of such Securities, in each case in satisfaction of all or any part of any
sinking fund payment with respect to the Securities of such series required to
be made pursuant to the terms of such Securities as provided for by the terms
of such series; provided that such Securities have not been previously so
credited.  Such Securities shall be received and credited for such purpose by
the Trustee at the Redemption Price specified in such Securities for redemption
through operation of the sinking fund and the amount of such sinking fund
payment shall be reduced accordingly.

SECTION 1203.    Redemption of Securities for Sinking Fund.

                 Not less than 45 days prior to each sinking fund
payment date for any series of Securities, the Company will deliver to the
Trustee an Officer's Certificate specifying the amount of the next ensuing
sinking fund payment for that series pursuant to the terms of that series, the
portion thereof, if any, which is to be satisfied by payment of cash and the
portion thereof, if any, which is to be satisfied by delivering and crediting
Securities of that series pursuant to Section 1202 and will also deliver to the
Trustee any Securities to be so delivered.  Not less than 30 days before each
such sinking fund payment date the Trustee shall select the Securities to be
redeemed upon such sinking fund payment date in the manner specified in Section
1103 and cause notice of the redemption thereof to be given in the name of and
at the expense of the Company in the manner provided in Section 1104.  Such
notice having been duly given, the redemption of such Securities shall be made
upon the terms and in the manner stated in Sections 1106 and 1107.


                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.    Applicability of Article; Company's Option to 
                 Effect Defeasance or Covenant Defeasance.

                 Unless pursuant to Section 301 provision is made for
the inapplicability of either or both of (a) Defeasance of the Securities of a
series under Section 1302 or (b) Covenant Defeasance of the Securities of a
series under Section 1303, then

                                    -78-
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the provisions of such Section or Sections, as the case may be, together with
the other provisions of this Article, shall be applicable to the Securities of
such series, and the Company may at its option by Board Resolution, at any
time, with respect to the Securities of such series, elect to have either
Section 1302 (unless inapplicable) or Section 1303 (unless inapplicable) be
applied to the Outstanding Securities of such series upon compliance with the
applicable conditions set forth below in this Article.

SECTION 1302.   Defeasance and Discharge.

                Upon the Company's exercise of the option provided in
Section 1301 to defease the Outstanding Securities of a particular series, the
Company shall be discharged from its obligations with respect to the
Outstanding Securities of such series on the date the applicable conditions set
forth in Section 1304 are satisfied (hereinafter, "DEFEASANCE").  Defeasance
shall mean that the Company shall be deemed to have paid and discharged the
entire indebtedness represented by the Outstanding Securities of such series
and to have satisfied all its other obligations under such Securities and this
Indenture insofar as such Securities are concerned (and the Trustee, at the
expense of the Company, shall execute proper instruments acknowledging the
same); provided, however, that the following rights, obligations, powers,
trusts, duties and immunities shall survive until otherwise terminated or
discharged hereunder:  (A) the rights of Holders of Outstanding Securities of
such series to receive, solely from the trust fund provided for in Section
1304, payments in respect of the principal of (and premium, if any) and
interest on such Securities when such payments are due, (B) the Company's
obligations with respect to such Securities under Sections 304, 305, 306, 1002
and 1009, (C) the rights, powers, trusts, duties and immunities of the Trustee
hereunder and (D) this Article.  Subject to compliance with this Article, the
Company may exercise its option with respect to Defeasance under this Section
1302 notwithstanding the prior exercise of its option with respect to Covenant
Defeasance under Section 1303 in regard to the Securities of such series.

SECTION 1303.   Covenant Defeasance.

                Upon the Company's exercise of the option provided in
Section 1301 to obtain a Covenant Defeasance with respect to the Outstanding
Securities of a particular series, the Company shall be released from its
obligations under this Indenture (except its obligations under Sections 304,
305, 306, 506, 509, 610, 1001, 1002, 1006, 1008 and 1009) with respect to the
Outstanding Securities of such series on and after the date the applicable
conditions set forth in Section 1304 are satisfied (hereinafter, "COVENANT
DEFEASANCE").  Covenant Defeasance shall mean that, with respect to the
Outstanding Securities of such series, the

                                    -79-
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Company may omit to comply with and shall have no liability in respect of any
term, condition or limitation set forth in this Indenture (except its
obligations under Sections 304, 305, 306, 506, 509, 610, 1001, 1002, 1006, 1008
and 1009), whether directly or indirectly by reason of any reference elsewhere
herein or by reason of any reference to any other provision herein or in any
other document, and such omission to comply shall not constitute an Event of
Default under Section 501(4) with respect to Outstanding Securities of such
series, and the remainder of this Indenture and of the Securities of such
series shall be unaffected thereby.

SECTION 1304.  Conditions to Defeasance or Covenant Defeasance.

                        The following shall be the conditions to Defeasance
under Section 1302 and Covenant Defeasance under Section 1303 with respect to
the Outstanding Securities of a particular series:

                                  (1)    the Company shall irrevocably have
                        deposited or caused to be deposited with the Trustee
                        (or another trustee satisfying the requirements of
                        Section 609 who shall agree to comply with the
                        provisions of this Article applicable to it), under the
                        terms of an irrevocable trust agreement in form and
                        substance reasonably satisfactory to such Trustee, as
                        trust funds in trust for the purpose of making the
                        following payments, specifically pledged as security
                        for, and dedicated solely to, the benefit of the
                        Holders of such Securities, (A) Dollars in an amount,
                        or (B) U.S. Government Obligations which through the
                        scheduled payment of principal and interest in respect
                        thereof in accordance with their terms will provide,
                        not later than the due date of any payment, money in an
                        amount, or (C) a combination thereof, in each case
                        sufficient, after payment of all federal, state and
                        local taxes or other charges or assessments in respect
                        thereof payable by the Trustee, in the opinion of a
                        nationally recognized firm of independent public
                        accountants expressed in a written certification
                        thereof delivered to the Trustee, to pay and discharge,
                        and which shall be applied by the Trustee (or other
                        qualifying trustee) to pay and discharge, (i) the
                        principal of (and premium, if any, on) and each
                        installment of principal of (and premium, if any) and
                        interest on the Outstanding Securities of such series
                        on the Stated Maturity of such principal or installment
                        of principal or interest and (ii) any mandatory sinking
                        fund payments or analogous payments applicable to the
                        Outstanding Securities of such series on the day on
                        which such payments are due and payable in accordance

                                    -80-
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                        with the terms of this Indenture and of such Securities.

                                  (2)    No Default or Event of Default with
                        respect to the Securities of such series shall have
                        occurred and be continuing on the date of such deposit
                        or shall occur as a result of such deposit, and no
                        Default or Event of Default under clause (5) or (6) of
                        Section 501 hereof shall occur and be continuing, at
                        any time during the period ending on the 91st day after
                        the date of such deposit (it being understood that this
                        condition shall not be deemed satisfied until the
                        expiration of such period).

                                  (3)    Such deposit, Defeasance or Covenant
                        Defeasance shall not result in a breach or violation
                        of, or constitute a default under, any other agreement
                        or instrument to which the Company is a party or by
                        which it is bound.

                                  (4)    Such Defeasance or Covenant Defeasance
                        shall not cause any Securities of such series then
                        listed on any national securities exchange registered
                        under the Exchange Act to be delisted.

                                  (5)    In the case of an election with
                        respect to Section 1302, the Company shall have
                        delivered to the Trustee either (A) a ruling directed
                        to the Trustee received from the Internal Revenue
                        Service to the effect that the Holders of the
                        Outstanding Securities of such series will not
                        recognize income, gain or loss for federal income tax
                        purposes as a result of such Defeasance and will be
                        subject to federal income tax on the same amounts, in
                        the same manner and at the same times as would have
                        been the case if such Defeasance had not occurred or
                        (B) an Opinion of Counsel, based on such ruling or on a
                        change in the applicable federal income tax law since
                        the date of this Indenture, in either case to the
                        effect that, and based thereon such opinion shall
                        confirm that, the Holders of the Outstanding Securities
                        of such series will not recognize income, gain or loss
                        for federal income tax purposes as a result of such
                        Defeasance and will be subject to federal income tax on
                        the same amounts, in the same manner and at the same
                        times as would have been the case if such Defeasance
                        had not occurred.

                                  (6)    In the case of an election with
                        respect to Section 1303, the Company shall have
                        delivered to the Trustee an Opinion of Counsel or a
                        ruling directed to the Trustee received from the
                        Internal Revenue Service to the effect that the Holders
                        of the Outstanding

                                    -81-
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                        Securities of such series will not recognize income,
                        gain or loss for federal income tax purposes as a
                        result of such Covenant Defeasance and will be subject
                        to federal income tax on the same amounts, in the same
                        manner and at the same times as would have been the
                        case if such Covenant Defeasance had not occurred.

                                  (7)    Such Defeasance or Covenant Defeasance
                        shall be effected in compliance with any additional
                        terms, conditions or limitations which may be imposed
                        on the Company in connection therewith pursuant to
                        Section 301.

                                  (8)    The Company shall have delivered to
                        the Trustee an Officer's Certificate and an Opinion of
                        Counsel, each stating that all conditions precedent
                        provided for relating to either the Defeasance under
                        Section 1302 or the Covenant Defeasance under Section
                        1303 (as the case may be) have been complied with.

SECTION 1305.   Deposited Money and Government Obligations To Be Held
                In Trust.

                Subject to the provisions of the last paragraph of
Section 1009, all money and Government Obligations (including the proceeds
thereof) deposited with the Trustee (or other qualifying trustee--collectively
for purposes of this Section 1305, the "Trustee") pursuant to Section 1304 in
respect of the Outstanding Securities of a particular series shall be held in
trust and applied by the Trustee, in accordance with the provisions of such
Securities and this Indenture, to the payment, either directly or through any
Paying Agent (including the Company acting as its own Paying Agent) as the
Trustee may determine, to the Holders of such Securities of all sums due and to
become due thereon in respect of principal (and premium, if any) and interest,
but such money need not be segregated from other funds except to the extent
required by law.

                The Company shall pay and indemnify the Trustee against
any tax, fee or other charge imposed on or assessed against the Government
Obligations deposited pursuant to Section 1304 or the principal and interest
received in respect thereof, other than any such tax, fee or other charge which
by law is for the account of the Holders of the Outstanding Securities of such
series.

                Anything in this Article to the contrary notwithstanding, the
Trustee shall deliver to pay to the Company from time to time upon Company
Request any money or Government Obligations held by it as provided in Section
1304 which, in the opinion of a nationally recognized firm of independent
public accountants expressed in a written certification thereof delivered to
the Trustee, are in excess of the amount thereof

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which would then be required to be deposited for the purpose for which such
money or Government Obligations were deposited.



                                ARTICLE FOURTEEN

                                 MISCELLANEOUS

SECTION 1401.  Miscellaneous.

                        This instrument may be executed in any number of
counterparts, each of which so executed shall be deemed to be an original, but
all such counterparts shall together constitute but one and the same
instrument.

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                        IN WITNESS WHEREOF, the parties hereto have caused this
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested, all as of the day and year first above written.


                                           MCN INVESTMENT CORPORATION



                                           By /s/ Sebastian Coppola
                                              -------------------------------
                                           Name:  Sebastian Coppola
                                           Title: Vice President and Treasurer


Attest:


/s/ Daniel L. Schiffer
    ----------------------------
Name:  Daniel L. Schiffer
Title: Senior Vice President, General
        Counsel and Secretary

                                           NBD BANK, as Trustee



                                           By /s/ Joseph L. Weidenbach
                                              -------------------------------
                                           Name:  Joseph L. Weidenbach
                                           Title: Trust Officer, Trust Division


Attest:


/s/ Steven D. Vander Clay
    ----------------------------
Name:  Steven D. Vander Clay
Title: Vice President and
       Assistant Secretary






                   MCN Investment Corporation and NBD Bank
                       Senior Debt Securities Indenture
                        dated as of September 1, 1995