EXHIBIT 10.22
                                        
                                CREDIT AGREEMENT

                                     -67-

 
                               CREDIT AGREEMENT


                         dated as of February 11, 1997


                                    between
 

                              MYCOGEN CORPORATION
 

                                      and


                           BANK OF AMERICA ILLINOIS
 

                                     -68-

 
                               TABLE OF CONTENTS



                                                                                                Page
                                                                                             
ARTICLE I  DEFINITIONS AND ACCOUNTING TERMS
     1.1.  Defined Terms.......................................................................    1
     1.2.  Use of Defined Terms................................................................   10
     1.3.  Cross-References....................................................................   10
     1.4.  Accounting and Financial Determinations.............................................   10

ARTICLE II COMMITMENTS, BORROWING PROCEDURES AND NOTES
     2.1.  Commitments.........................................................................   11
             2.1.1.  Revolving Loans...........................................................   11
             2.1.2.  Term Loan.................................................................   11
     2.2.  Reduction of Revolving Credit Commitment............................................   11
     2.3.  Borrowing Procedure-Revolving Loans.................................................   11
     2.4.  Borrowing Procedure-Term Loan.......................................................   12
     2.5.  Eurocurrency Rate Loans and Eurodollar Rate Loans...................................   12
     2.6.  Quoted Rate Loans...................................................................   12
     2.7.  Reference Rate Loans................................................................   13
     2.8.  Proceeds............................................................................   13
     2.9.  Continuation and Conversion Elections...............................................   13
             2.9.1.  Eurocurrency Rate Loans, Eurodollar Rate Loans and Reference Rate Loans...   14
             2.9.2.  Quoted Rate Loans.........................................................   15
     2.10. Currency Equivalents................................................................   15
     2.11. Funding.............................................................................   16
     2.12. Notes...............................................................................   17

ARTICLE III REPAYMENTS, PREPAYMENTS, INTEREST AND FEES
     3.1.  Repayments and Prepayments..........................................................   17
     3.2.  Interest Provisions.................................................................   18
             3.2.1.  Rates.....................................................................   18
             3.2.2.  Post-Maturity Rates.......................................................   19
             3.2.3.  Payment Dates.............................................................   19
     3.3.  Fees................................................................................   20
             3.3.1.  Commitment Fee............................................................   20
             3.3.2.  Closing Fee...............................................................   20
     3.4.  Computation of Interest and Fees....................................................   21

ARTICLE IV CERTAIN INTEREST RATE AND OTHER PROVISIONS
     4.1.  Fixed Rate Lending Unlawful.........................................................   21
     4.2.  Deposits Unavailable................................................................   21
     4.3.  Increased Capital Costs With Respect to Commitments.................................   21
     4.4.  Funding Losses......................................................................   22
     4.5.  Taxes...............................................................................   22
     4.6.  Payments, Computations, etc.........................................................   23
     4.7.  Setoff..............................................................................   24
     4.8.  Use of Proceeds.....................................................................   24
     4.9.  Currency Indemnification............................................................   24

ARTICLE V  CONDITIONS TO BORROWING
     5.1.  Initial Borrowing of the Company....................................................   25
             5.1.1.  Secretary's Certificate...................................................   25


                                     -69-

 

                                                                                             
              5.1.2.  Delivery of Notes........................................................   26
              5.1.3.  Opinion of Counsel.......................................................   26
              5.1.4.  Letter of Awareness......................................................   26
              5.1.5.  Good Standing............................................................   26
              5.1.6.  Expenses, etc............................................................   26
              5.1.7.  Closing Fee..............................................................   26
              5.1.8.  Compliance Certificate...................................................   26
     5.2.   All Borrowings.....................................................................   26
              5.2.1.  Compliance with Warranties, No Default, etc..............................   26
              5.2.2.  Borrowing Request........................................................   27
              5.2.3.  Satisfactory Legal Form..................................................   27

ARTICLE VI  REPRESENTATIONS AND WARRANTIES
     6.1.   Organization, etc..................................................................   27
     6.2.   Due Authorization, Non-Contravention, etc..........................................   27
     6.3.   Government Approval, Regulation, etc...............................................   28
     6.4.   Validity, etc......................................................................   28
     6.5.   Financial Information..............................................................   28
     6.6.   No Material Adverse Change.........................................................   28
     6.7.   Litigation, Labor Controversies, etc...............................................   28
     6.8.   Subsidiaries.......................................................................   29
     6.9.   Partnerships; Joint Ventures.......................................................   29
     6.10.  Ownership of Properties............................................................   29
     6.11.  Taxes..............................................................................   29
     6.12.  Insurance..........................................................................   29
     6.13.  Pension and Welfare Plans..........................................................   29
     6.14.  Environmental Warranties...........................................................   30
     6.15.  Regulations G, U and X.............................................................   31
     6.16.  Accuracy of Information............................................................   31
     6.17.  No Default.........................................................................   31

ARTICLE VII COVENANTS
     7.1.   Affirmative Covenants..............................................................   31
              7.1.1.  Financial Information, Reports, Notices, etc.............................   31
              7.1.2.  Compliance with Laws, etc................................................   33
              7.1.3.  Maintenance of Properties................................................   33
              7.1.4.  Insurance................................................................   33
              7.1.5.  Books and Records........................................................   33
              7.1.6.  Environmental Covenant...................................................   34
              7.1.7.  Taxes....................................................................   34
              7.1.8.  Supplemental Performance.................................................   34
              7.1.9.  Seasonal Clean-up........................................................   34
     7.2.   Negative Covenants.................................................................   35
              7.2.1.  Consolidated Tangible Net Worth..........................................   35
              7.2.2.  Consolidated Total Liabilities to Consolidated Tangible Net Worth........   35
              7.2.3.  Consolidated Third-Party Indebtedness....................................   35
              7.2.4.  Minimum Cash Flow Coverage...............................................   35
              7.2.5.  Liens....................................................................   35
              7.2.6.  Change in Character of Business..........................................   36

ARTICLE VIII  EVENTS OF DEFAULT
     8.1.   Listing of Events of Default.......................................................   37
              8.1.1.  Non-Payment of Obligations...............................................   37
              8.1.2.  Breach of Warranty.......................................................   37


                                     -70-

 

                                                                                             
              8.1.3.  Non-Performance of Covenants and Obligations.............................   37
              8.1.4.  Default on Third-Party Indebtedness......................................   37
              8.1.5.  Judgments................................................................   38
              8.1.6.  Bankruptcy, Insolvency, etc..............................................   38
              8.1.7.  Other Bank Agreements....................................................   39
              8.1.8.  Change in Ownership......................................................   39
     8.2.   Action if Bankruptcy...............................................................   39
     8.3.   Action if Other Event of Default...................................................   39

ARTICLE IX  MISCELLANEOUS PROVISIONS
     9.1.   Waivers, Amendments, etc...........................................................   39
     9.2.   Notices............................................................................   40
     9.3.   Payment of Costs and Expenses......................................................   40
     9.4.   Indemnification....................................................................   40
     9.5.   Survival...........................................................................   41
     9.6.   Severability.......................................................................   41
     9.7.   Headings...........................................................................   41
     9.8.   Execution in Counterparts, Effectiveness, etc......................................   41
     9.9.   Governing Law; Entire Agreement....................................................   42
     9.10.  Successors and Assigns.............................................................   42
     9.11.  Forum Selection and Consent to Jurisdiction........................................   42
     9.12.  Waiver of Jury Trial...............................................................   42


                                     -71-

 
                               CREDIT AGREEMENT


      THIS CREDIT AGREEMENT, dated as of February 11, 1997 between MYCOGEN
CORPORATION, a California corporation (the "Company") and BANK OF AMERICA
ILLINOIS, an Illinois banking corporation (the "Bank").


                             W I T N E S S E T H:


      WHEREAS, the Company desires to obtain a Commitment from the Bank pursuant
to which the Bank shall make to the Company Revolving Loans in a maximum
aggregate principal amount at any one time outstanding not to exceed
$10,000,000, and a Term Loan in a maximum principal amount not to exceed
$15,000,000; and

      WHEREAS, the Bank is willing, on the terms and subject to the conditions
hereinafter set forth, to extend such Commitment and make such Loans to the
Company;

      NOW, THEREFORE, the parties hereto agree as follows:


                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS


      SECTION 1.1.  Defined Terms.  The following terms (whether or not
                    -------------                                      
underscored) when used in this Agreement, including its preamble and recitals,
shall, except where the context otherwise requires, have the following meanings
(such meanings to be equally applicable to the singular and plural forms
thereof):

      "Agreement" means, on any date, this Credit Agreement as originally in
       ---------                                                            
effect on the Effective Date and as thereafter from time to time amended,
supplemented, amended and restated, or otherwise modified and in effect on such
date.

      "Authorized Officer" means, relative to the Company and any action to be
       ------------------                                                     
taken on behalf of the Company, any authorized corporate officer of the Company
or its affiliates and any other employee of the Company duly designated and
authorized by an authorized corporate officer to take such action.

      "Bank" is defined in the preamble.
       ----                             

      "Banking Day" means (a) any day which is neither a Saturday or Sunday nor
       -----------                                                             
a legal holiday on which banks are authorized or required to be closed in
Chicago, Illinois, (b) relative to the making, continuing, prepaying or repaying
of (i) any Eurodollar Rate Loans, any day on which dealings in Eurodollars are
carried on in the interbank eurodollar market and (ii) any Eurocurrency Loans,
any day on which dealings in the applicable currency are carried on in both the
country of issue of such currency and in the country where payment or
disbursement thereof is to be made.

      "Borrowing" means Loans of the same Type and, in the case of Fixed Rate
       ---------                                                             
Loans, having the same Interest Period, made by the Bank on the same Banking Day
and pursuant to the same Borrowing Request in accordance with Section 2.1 and
                                                              -----------    
2.3.
- --- 

      "Borrowing Request" means a loan request and certificate duly executed by
       -----------------                                                       
an Authorized Officer of the Company substantially in the form of Exhibit A
                                                                  ---------
hereto.

                                     -72-

 
      "CERCLA" shall mean the Comprehensive Environmental Response, Compensation
       ------                                                                   
and Liability Act of 1980, as amended from time to time.

      "Code" means the Internal Revenue Code of 1986, as amended, reformed or
       ----                                                                  
otherwise modified from time to time.

      "Commitment" means, the Bank's obligation to make Loans pursuant to
       ----------                                                        
Section 2.1.
- ----------- 

      "Commitment Amount" means, on any date, $10,000,000 with respect to the
       -----------------                                                     
Revolving Loans (in Dollars and/or Dollar Equivalent) and $15,000,000 with
respect to the Term Loan (in Dollars only), as such amount may be reduced from
time to time pursuant to Section 2.2.
                         ----------- 

      "Company" is defined in the preamble.
       -------                             

      "Compliance Certificate" is defined in Section 7.1.1(c).
       ----------------------                ---------------- 

      "Continuation/Conversion Notice" means a notice of continuation or
       ------------------------------                                   
conversion and certificate duly executed by an Authorized Officer of the Company
substantially in the form of Exhibit B hereto.
                             ---------        

      "Default" means any Event of Default or any condition, occurrence or event
       -------                                                                  
which, after notice or lapse of time or both, would constitute an Event of
Default.

      "Demand Deposit Account" means account No. ___________ maintained by the
       ----------------------                                                 
Company at the Bank's 231 South LaSalle Street, Chicago, Illinois location, and
any replacements or substitutions therefor.

      "Designated Currency" is defined in the definition of "Eurocurrency".
       -------------------                                                 

      "Determination Date" means each of those dates determined in accordance
       ------------------                                                    
with Section 2.10(b).
     --------------- 

      "Dollar Equivalent" means, (i) in the case of an amount denominated in
       -----------------                                                    
Dollars, such amount, and (ii) in any currency other than Dollars, the Dollar
equivalent of such amount as determined in accordance with Section 2.10.
                                                           ------------ 

      "Dollars" and the sign "$" mean lawful money of the United States.
       -------                -                                         

      "Domestic Dollars" means Dollars on deposit in the United States of
       ----------------                                                  
America.

      "Domestic Office" means, the office the Bank set forth below its signature
       ---------------                                                          
hereto, or such other office of the Bank within the United States as may be
designated from time to time by notice from the Bank to the Company.

      "DowElanco" means DowElanco, an Indiana partnership consisting of Dow
       ---------                                                           
Chemical Company's subsidiary Rofan Services, Inc. and Eli Lilly & Company,
Inc.'s subsidiary EPCO, Inc.

      "Effective Date" means the date this Agreement becomes effective pursuant
       --------------                                                          
to Section 9.8.
   ----------- 

      "Environmental Warranties" is defined in Section 6.14.
       ------------------------                ------------ 

      "ERISA" means the Employee Retirement Income Security Act of 1974, as
       -----                                                               
amended, and any successor statute of similar import, together with the
regulations thereunder, in each case as in effect from time to time.  References
to sections of ERISA also refer to any successor sections.

      "ERISA Affiliate" means any corporation, partnership, or other trade or
       ---------------                                                       
business (whether or not incorporated) that is, along with the Company, a member
of a controlled group of corporations or a controlled

                                     -73-

 
group of trades or businesses, as described in sections 414(b) and 414(c),
respectively, of the Code or section 4001 of ERISA, or a member of the same
affiliated service group within the meaning of section 414(m) of the Code.

      "Eurocurrency" means (i) each of Pounds Sterling, French Francs, Swiss
       ------------                                                         
Francs, Deutschmarks, Canadian Dollars, Australian Dollars, Japanese Yen and
European Currency Units (each, a "Designated Currency"), and (ii) any other
currency (other than Dollars) to which the Bank shall consent, in each case (x)
on deposit outside such currency's country of issuance and (y) as long as such
currency is freely transferable and convertible into Dollars.

      "Eurocurrency Rate Loan" means a Loan made in a Eurocurrency and bearing
       ----------------------                                                 
interest, at all times during an Interest Period applicable to such Loan, at a
fixed rate of interest determined by reference to the Interbank Rate (Reserve
Adjusted) or the LIBOR Rate (Reserve Adjusted), as the case may be.

      "Eurodollar" mean Dollars on deposit in a bank outside the United States
       ----------                                                             
of America, its territories and possessions, which are available for transfer to
and from the United States of America, its territories and possessions.

      "Eurodollar Rate Loan" means a Loan made and payable in Dollars bearing
       --------------------                                                  
interest, at all times during an Interest Period applicable to such Loan, at a
fixed rate of interest determined by reference to the Interbank Rate (Reserve
Adjusted) or the LIBOR Rate (Reserve Adjusted), as the case may be.

      "Event of Default" is defined in Section 8.1.
       ----------------                ----------- 

      "Fixed Rate Loan" means any Eurodollar Rate Loan, Eurocurrency Rate Loan
       ---------------                                                        
or Quoted Rate Loan.

      "F.R.S. Board" means the Board of Governors of the Federal Reserve System
       ------------                                                            
or any successor thereto.

      "GAAP" is defined in Section 1.4.
       ----                ----------- 

      "herein", "hereof", "hereto", "hereunder" and similar terms contained in
       ------    ------    ------    ---------                                
this Agreement or any other Loan Document refer to this Agreement or such other
Loan Document, as the case may be, as a whole and not to any particular Section,
paragraph or provision of this Agreement or such other Loan Document.

      "Indemnified Liabilities" is defined in Section 9.4.
       -----------------------                ----------- 

      "Indemnified Parties" is defined in Section 9.4.
       -------------------                ----------- 

      "Interbank Lending Office" means, the office of the Bank designated as
       ------------------------                                             
such below its signature hereto or such other office of the Bank as designated
from time to time by notice from the Bank to the Company, whether or not outside
the United States, which shall be making or maintaining Eurodollar Rate Loans or
Eurocurrency Rate Loans of the Bank.

      "Interbank Rate" means, relative to any Interest Period for Eurocurrency
       --------------                                                         
Rate Loans or Eurodollar Rate Loans, the rate of interest equal to the average
(rounded upwards, if necessary, to the nearest 1/16 of 1%) of the rates per
annum at which deposits in immediately available funds (a) in the case of a
Eurodollar Rate Loan, in Eurodollars and (b) in the case of a Eurocurrency Loan,
in either (i) the appropriate Eurocurrency or (ii) Dollars or Eurodollars in an
amount equal to the Dollar Equivalent of such Eurocurrency deposits (plus the
cost of any contract purchased or sold by the Bank to hedge the conversion of
Dollars or Eurodollars, as applicable, into or from such Eurocurrency) are
offered to the Bank's Interbank Lending Office by major banks in the interbank
eurocurrency market as at or about 9:00 a.m. Chicago, Illinois time two (2)
Banking Days prior to the beginning of such Interest Period for delivery on the
first day of such Interest Period, and in 

                                     -74-

 
an amount approximately equal to the amount of such Eurocurrency Rate Loan or
Eurodollar Rate Loan, as applicable, and for a period approximately equal to
such Interest Period.

      "Interbank Rate (Reserve Adjusted)" means, relative to any Loan to be
       ---------------------------------                                   
made, continued or maintained as, or converted into, a Eurocurrency Rate Loan or
a Eurodollar Rate Loan for any Interest Period bearing interest with reference
to the Interbank Rate, a rate per annum (rounded upwards, if necessary, to the
nearest 1/16 of 1%) determined pursuant to the following formula:

 Interbank Rate   =        Interbank Rate
                      -------------------------
(Reserve Adjusted)    1.00 - Reserve Percentage

      "Interest Period" means, (a) with respect to any Eurodollar Rate Loan or
       ---------------                                                        
Eurocurrency Rate Loan, the one-month, two-month, three-month or six-month
period as selected by the Company and (b) with respect to (i) any Revolving Loan
bearing interest at the Quoted Rate, the one-week, two-week, three-week, thirty-
day, sixty-day, ninety-day or one hundred and eighty-day period as selected by
the Company and (ii) any portion of the Term Loan bearing interest at the Quoted
Rate, any period ranging from one week to five years as selected by the Company,
in each case beginning on (and including) the date on which such Fixed Rate Loan
is made or continued as, or converted into, a Fixed Rate Loan pursuant to
Section 2.3 or 2.4, in each case as the applicable Borrower may select in its
- -----------    ---                                                           
relevant notice pursuant to Section 2.3 or 2.4; provided, however, that
                            -----------    ---  --------  -------      

           (a)  the Company shall not be permitted to select Interest Periods
      for Fixed Rate Loans to be in effect at any one time which will have
      expiration dates occurring on more than five (5) different dates;

           (b)  Interest Periods commencing on the same date for Loans
      comprising part of the same Borrowing shall be of the same duration;

           (c)  if such Interest Period would otherwise end on a day which is
      not a Banking Day, such Interest Period shall end on the next following
      Banking Day (unless, if such Interest Period applies to Eurocurrency Rate
      Loans or Eurodollar Rate Loans, such next following Banking Day is the
      first Banking Day of a calendar month, in which case such Interest Period
      shall end on the Banking Day next preceding such numerically corresponding
      day);

           (d)  no Interest Period with respect to any Revolving Loan may end
      later than the date set forth in clause (a) of the definition of
      "Revolving Credit Termination Date"; and

           (e) no Interest Period with respect to the Term Loan may end later
      than the date set forth in clause (a) of the definition of "Term Credit
      Termination Date".

      "LIBOR Lending Office" means the office of the Bank designated as such
       --------------------                                                 
below its signature hereto or such other office of the Bank as designated for
time to time by notice from the Bank to the Company, whether or not outside the
United States, which shall be making or maintaining Eurodollar Rate Loans or
Eurocurrency Rate Loans of the Bank.

      "LIBOR Rate" means, relative to any Interest Period for Eurocurrency Rate
       ----------                                                              
Loans or Eurodollar Rate Loans, the rate of interest equal to the average
(rounded upwards, if necessary, to the nearest 1/16 of 1%) of the rates per
annum at which deposits in immediately available funds (a) in the case of a
Eurodollar Rate Loan, in Eurodollars and (b) in the case of a Eurocurrency Loan,
in either (i) the appropriate Eurocurrency or (ii) Dollars or Eurodollars in an
amount equal to the Dollar Equivalent of such Eurocurrency deposits (plus the
cost of any contract purchased or sold by the Bank to hedge the conversion of
Dollars or Eurodollars, as applicable, into or from such Eurocurrency) are
offered to the Bank's LIBOR Lending Office by major banks in the London, England
eurocurrency market as at or about 9:00 a.m. Chicago, Illinois time three (3)
Banking Days prior to the beginning of such Interest Period for delivery on the
first day of such Interest Period, and in 

                                     -75-

 
an amount approximately equal to the amount of the Bank's Eurocurrency Rate Loan
or Eurodollar Rate Loan, as applicable, and for a period approximately equal to
such Interest Period.

      "LIBOR Rate (Reserve Adjusted)" means, relative to any Loan to be made,
       -----------------------------                                         
continued or maintained as, or converted into, a Eurocurrency Rate Loan or a
Eurodollar Rate Loan to any Interest Period bearing interest with reference to
the LIBOR Rate, a rate per annum (rounded upwards, if necessary, to the nearest
1/16 of 1%) determined pursuant to the following formula:

           Interbank Rate      =           LIBOR Rate
                                    -------------------------
         (Reserve Adjusted)         1.00 - Reserve Percentage

      "Lien" means any security interest, mortgage, pledge, hypothecation,
       ----                                                               
assignment, deposit arrangement, encumbrance, lien (statutory or otherwise),
charge against or interest in property to secure payment of a debt or
performance of an obligation or other priority or preferential arrangement of
any kind or nature whatsoever.

      "Loans" means the Revolving Loans and the Term Loan made by the Bank to
       -----                                                                 
the Company pursuant to this Agreement.

      "Loan Document" means this Agreement, the Notes, and each other agreement,
       -------------                                                            
document or instrument delivered in connection with this Agreement and the
Notes.

      "Monthly Payment Date" means the last day of each calendar month or, if
       --------------------                                                  
any such day is not a Banking Day, the next succeeding Banking Day.

      "Notes" means the Revolving Note and the Term Note.
       -----                                             

      "Obligations" means all obligations (monetary or otherwise) of the Company
       -----------                                                              
arising under or in connection with this Agreement, the Notes and each other
Loan Document.

      "Organic Document" means, relative to the Company, its certificate of
       ----------------                                                    
incorporation, its by-laws and all shareholder agreements, voting trusts and
similar arrangements applicable to any of its authorized shares of capital
stock.

      "PBGC" means the Pension Benefit Guaranty Corporation and any entity
       ----                                                               
succeeding to any or all of its functions under ERISA.

      "Pension Plan" means a "pension plan", as such term is defined in section
       ------------                                                            
3(2) of ERISA, which is subject to Title IV of ERISA (other than a multiemployer
plan as defined in section 4001(a)(3) of ERISA), and to which the Company or any
ERISA Affiliate may have liability, including any liability by reason of having
been a substantial employer within the meaning of section 4063 of ERISA at any
time during the preceding five years, or by reason of being deemed to be a
contributing sponsor under section 4069 of ERISA.

      "Person" means any natural person, corporation, partnership, firm,
       ------                                                           
association, trust, government, governmental agency or any other entity, whether
acting in an individual, fiduciary or other capacity.

      "Plan" means any Pension Plan or Welfare Plan.
       ----                                         

      "Prior Currency" is defined in Section 2.9.
       --------------                ----------- 

      "Property" shall mean all assets and properties of any nature whatsoever,
       --------                                                                
whether real or personal, tangible or intangible, including without limitation
biotechnology products and techniques and intellectual property.

                                     -76-

 
      "Quarterly Payment Date" means the last day of each March, June,
       ----------------------                                         
September, and December or, if any such day is not a Banking Day, the next
succeeding Banking Day.

      "Quoted Rate" means the rate of interest quoted by the Bank pursuant to
       -----------                                                           
Section 2.6 applicable to a Borrowing of Quoted Rate Loans.
- -----------                                                

      "Quoted Rate Loan" means a Loan made and payable in Dollars bearing
       ----------------                                                  
interest, at all times during an Interest Period applicable to such Loan, at the
Quoted Rate applicable thereto.

      "Reference Rate" means, on any date and with respect to all Reference Rate
       --------------                                                           
Loans, a fluctuating rate of interest per annum equal to the rate of interest
most recently announced by the Bank at Chicago, Illinois as its Reference Rate.
The Reference Rate is not necessarily intended to be the lowest rate of interest
determined by the Bank in connection with extensions of credit.  For purposes of
this Agreement, any change in the Reference Rate due to a change in the
Reference Rate shall be effective on the date such change in the Reference Rate
is announced.  The Bank will give notice promptly to the Company of changes in
the Reference Rate.

      "Reference Rate Loan" means a Loan made and payable in Dollars bearing
       -------------------                                                  
interest at a fluctuating rate determined by reference to the Reference Rate.

      "Reportable Event" has the meaning given to such term in ERISA.
       ----------------                                              

      "Reserve Percentage" means, relative to any Interest Period for
       ------------------                                            
Eurocurrency Rate Loans or Eurodollar Rate Loans, the reserve percentage
(expressed as a decimal) equal to the maximum aggregate reserve requirements
(including all basic, emergency, supplemental, marginal and other reserves and
taking into account any transitional adjustments or other scheduled changes in
reserve requirements) specified under regulations issued from time to time by
the F.R.S. Board and then applicable to assets or liabilities consisting of and
including "Eurocurrency Liabilities", as currently defined in Regulation D of
the F.R.S. Board, having a term approximately equal or comparable to such
Interest Period.  For purposes of this definition, any Eurocurrency Rate Loans
or Eurodollar Rate Loans hereunder shall be deemed to be "Eurocurrency
Liabilities" as defined in Regulation D.

      "Revolving Commitment Termination Date" means the earliest to occur of:
       -------------------------------------                                 

           (a)  February 1, 1998;

           (b)  the date on which the Revolving Credit Commitment is terminated
      in full or reduced to zero pursuant to Section 2.2; or
                                             -----------    
           (c)  the date on which any Event of Default occurs.

      "Revolving Credit Commitment" means the Commitment of the Bank to make
       ---------------------------                                          
Revolving Loans to the Company in an aggregate outstanding amount not to exceed
$10,000,000.

      "Revolving Loans" means the loans made by the Bank to the Company pursuant
       ---------------                                                          
to Section 2.1.1.
   ------------- 

      "Revolving Note" means the promissory note of the Company payable to the
       --------------                                                         
order of the Bank, in the form of Exhibit C hereto (as such promissory note may
                                  ---------                                    
be amended, endorsed or otherwise modified from time to time), evidencing the
aggregate Revolving Loans made by the Bank to the Company hereunder, and all
other promissory notes accepted from time to time in substitution therefor or
renewal thereof.

      "Second Currency" is defined in Section 2.9.
       ---------------                ------------

                                     -77-

 
      "Subsidiary" means, as to any Person, (i) any corporation of which or in
       ----------                                                             
which such Person, such Person and one or more of its Subsidiaries, or one or
more Subsidiaries of such Person directly or indirectly own 50% or more of the
combined voting power of all classes of stock having general voting power under
ordinary circumstances to elect a majority of the board of directors of such
corporation (irrespective of whether at the time capital stock of any other
class or classes of such corporation shall or might have voting power upon
the occurrence of any contingency), (ii) any partnership, joint venture or
similar entity of which or in which such Person, such Person and one or more of
its Subsidiaries, or one or more Subsidiaries of such Person directly or
indirectly own 50% or more of the capital interest or profits interest or (iii)
any trust, association or other unincorporated organization of which or in which
such Person, and one or more of its Subsidiaries, or one or more Subsidiaries of
such Person directly or indirectly own 50% or more of the beneficial interest.

      "Taxes" is defined in Section 4.6.
       -----                ----------- 

      "Term Commitment Termination Date" means the earlier to occur of:
       --------------------------------                                

           (a)  February 1, 2002; or

           (b)  the date on which any Event of Default occurs.

      "Term Credit Commitment" means the Commitment of the Bank to make a Term
       ----------------------                                                 
Loan to the Company in a principal amount not to exceed $15,000,000.

      "Termination Event" with respect to any Pension Plan means (i) the
       -----------------                                                
institution by the Company, the PBGC or any other Person of steps to terminate
such Plan, (ii) the occurrence of a Reportable Event with respect to such Plan
which the Bank or the Required Lenders reasonably believes may be a basis for
the PBGC to institute steps to terminate such Plan, or (iii) the withdrawal from
such Plan (or deemed withdrawal under section 4062 (f) of ERISA) by the Company
or any ERISA Affiliate which is a substantial employer within the meaning of
section 4063 of ERISA.

      "Term Loan" means the loan made by the Bank to the Company pursuant to
       ---------                                                            
Section 2.1.2.
- ------------- 

      "Term Note" means the promissory note of the Company payable to the order
       ---------                                                               
of the Bank, in the form of Exhibit D hereto (as such promissory note may be
                            ---------                                       
amended, endorsed or otherwise modified from time to time), evidencing the Term
Loan made by the Bank to the Company hereunder, and any other promissory notes
accepted from time to time in substitute therefore or renewal thereof.

      "Type" means, relative to any Loan, the portion thereof, if any, being
       ----                                                                 
maintained as a Reference Rate Loan, Eurocurrency Rate Loan, Eurodollar Rate
Loan or Quoted Rate Loan.

      "United States" or "U.S." means the United States of America, its fifty
       -------------      ----                                               
States and the District of Columbia.

      "Welfare Plan" means a "welfare plan", as such term is defined in section
       ------------                                                            
3(1) of ERISA.

      SECTION 1.2.  Use of Defined Terms.  Unless otherwise defined or the
                    --------------------                                  
context otherwise requires, terms for which meanings are provided in this
Agreement shall have such meanings when used in the Schedules to this Agreement
and in each Note, Borrowing Request, Continuation/Conversion Notice, Loan
Document, notice and other communication delivered from time to time in
connection with this Agreement or any other Loan Document.

      SECTION 1.3.  Cross-References.  Unless otherwise specified, references in
                    ----------------                                            
this Agreement and in each other Loan Document to any Article or Section are
references to such Article or Section of this Agreement or such other Loan
Document, as the case may be, and, unless otherwise specified, references in 

                                     -78-

 
any Article, Section or definition to any clause are references to such clause
of such Article, Section or definition.

      SECTION 1.4.  Accounting and Financial Determinations.  Unless otherwise
                    ---------------------------------------                   
specified, all accounting terms used herein or in any other Loan Document shall
be interpreted, all accounting determinations and computations hereunder or
thereunder shall be made, and all financial statements required to be delivered
hereunder or thereunder shall be prepared in accordance with, those generally
accepted accounting principles ("GAAP") applied in the preparation of the
financial statements referred to in Section 6.5.
                                    ----------- 


                                 ARTICLE II

                  COMMITMENTS, BORROWING PROCEDURES AND NOTES

      SECTION 2.1.  Commitments.  On the terms and subject to the conditions of
                    -----------                                                
this Agreement, the Bank agrees to make Loans pursuant to the Commitments
described in this Section 2.1.
                  ----------- 

           SECTION 2.1.1.  Revolving Loans.  From time to time on any Banking
                           ---------------                                   
      Day occurring from and including the Effective Date but prior to the
      Revolving Commitment Termination Date, the Bank will make Revolving Loans
      to the Company in aggregate principal amount equal to the Revolving Credit
      Commitment.  Revolving Loans will be available in Dollars or any
      Eurocurrency herein provided for.  On the terms and subject to the
      conditions hereof, the Company may from time to time borrow, prepay and
      reborrow Revolving Loans made to it.

           SECTION 2.1.2.  Term Loan.  On any Banking Day occurring from and
                           ---------                                        
      including the Effective Date but prior to the Term Commitment Termination
      Date, the Bank will make a term Loan to the Company, in one (1)
      disbursement, in an amount not to exceed the Term Credit Commitment.  The
      Term Loan will be available only in Dollars.  The Company may not reborrow
      any amounts of the Term Loan which are paid or prepaid hereunder.

      SECTION 2.2.  Reduction of Revolving Credit Commitment.  The Company may,
                    ----------------------------------------                   
from time to time on any Banking Day occurring after the Effective Date,
voluntarily reduce the Revolving Credit Commitment; provided, however, that all
                                                    --------  -------          
such reductions shall require at least three (3) Banking Days' prior notice to
the Bank and shall be permanent, and any partial reduction of the Revolving
Credit Commitment shall be in a minimum amount of $1,000,000 (in Dollars and/or
Dollar Equivalent) and in an integral multiple of $1,000,000 (in Dollars and/or
Dollar Equivalent).

      SECTION 2.3.  Borrowing Procedure-Revolving Loans.  By requesting in
                    -----------------------------------                   
writing or by telephone (upon request to the Bank, promptly confirmed in
writing) on or before 11:00 a.m., Chicago, Illinois time, on a Banking Day, in
accordance with the provisions of this Section 2.3 applicable to the Type of
                                       -----------                          
Borrowing requested, the Company, through one of its Authorized Officers may,
from time to time irrevocably request that a Revolving Loan be made (a) in the
case of Reference Rate Loans, in a minimum aggregate amount of $200,000 and
multiples of $200,000, or in the unused amount of the Revolving Credit
Commitment and (b) in the case of Fixed Rate Loans of any Type, in a minimum
aggregate amount of $200,000 and multiples of $200,000.   Each Revolving Loan
shall be comprised of the same Type of Loans, and shall be made on the same
Banking Day.  Upon request of the Bank, all telephonic or other oral requests
for a Revolving Loan shall be promptly confirmed in writing by delivery to the
Bank of a Borrowing Request therefor (including delivery by facsimile
transmission in accordance with Section 9.2) duly executed by an Authorized
                                -----------                                
Officer not later than three (3) Banking Days after the date of any such oral
request, provided, however, that the Company's failure to comply with any of the
         --------  -------                                                      
above requirements shall not in any manner affect the obligations of the Company
to repay any Revolving Loan in accordance with the terms of this Agreement and
the Revolving Note.

                                     -79-

 
      SECTION 2.4.  Borrowing Procedure-Term Loan.  By requesting in writing
                    -----------------------------                             
or by telephone (upon request of the Bank, promptly confirmed in writing) on or
before 11:00 a.m., Chicago, Illinois time, on a Banking Day, the Company,
through one of its Authorized Officers may, irrevocably request that the Term
Loan be made. Upon request of the Bank, all telephonic or other oral requests
for the Term Loan shall be promptly confirmed in writing by delivery to the Bank
of a Borrowing Request therefor (including delivery by facsimile transmission in
accordance with Section 9.2) duly executed by an Authorized Officer not later
                ----------- 
than three (3) Banking Days after the date of any such oral request, 
provided, however, that the Company's failure to comply with any of the above
- --------  ------- 
requirements shall not in any manner affect the obligations of the Company to
repay the Term Loan in accordance with the terms of this Agreement and the Term
Note.

      SECTION 2.5.  Eurocurrency Rate Loans and Eurodollar Rate Loans.  Each
                    -------------------------------------------------         
request for a Borrowing of Eurocurrency Rate Loans or Eurodollar Rate Loans
shall be received by the Bank from an Authorized Officer on or before 11:00
a.m., Chicago, Illinois time, on a Banking Day not less than (a) two (2) Banking
Days' prior to the date of the requested Borrowing in the case of Eurodollar
Rate Loans bearing interest with reference to the Interbank Rate (Reserve
Adjusted) and (b) three (3) Banking Days' prior to the date of the requested
Borrowing in the case of Eurocurrency Rate Loans [(whether bearing interest with
reference to the Interbank Rate (Reserve Adjusted) or the Libor Rate (Reserve
Adjusted)] or Eurodollar Rate Loans bearing interest with reference to the Libor
Rate (Reserve Adjusted).  Each request shall specify (i) whether such Loan is to
bear interest initially with reference to the Interbank Rate (Reserve Adjusted)
or the LIBOR Rate (Reserve Adjusted), (ii) the borrowing date, which day shall
be a Banking Day, (iii) the amount and, if the Borrowing is to be of
Eurocurrency Rate Loans, the currency of the requested Borrowing and (iv) the
initial Interest Period for such Borrowing.

      SECTION 2.6.  Quoted Rate Loans.   Each request for a Borrowing of
                    -----------------                                     
Quoted Rate Loans shall be received by the Bank from an Authorized Officer of
the Company on or before 11:00 a.m., Chicago, Illinois time, on the Banking Day
of the requested Borrowing.  Each request shall specify (i) the amount of
requested Borrowing and (ii) the initial Interest Period for such Borrowing.
Each such request shall be deemed to constitute a request to receive by
telephone, from the Bank, a quotation of the interest rate that would be
applicable to the Borrowing of Quoted Rate Loans identified in such borrowing
request for the Interest Period specified therein.  If such interest rate is
satisfactory to the Company an Authorized Officer of the Company shall, no later
than 11:00 a.m. Chicago, Illinois time, on such date, so indicate.  Such
indication by an Authorized Officer of the Company shall constitute an
irrevocable request that such Borrowing of Quoted Rate Loans be made at the rate
the Bank quoted or would have quoted to the Company at the time of such
indication of acceptance, it being understood that the Bank does not guarantee
that the interest rate quoted with respect to a particular requested Borrowing
of Quoted Rate Loans shall continue to be available if such rate is not accepted
by an Authorized Officer of the Company at the time of quotation.

      SECTION 2.7.  Reference Rate Loans.  Each request for a Borrowing of
                    --------------------                                    
Reference Rate Loans shall be received by the Bank from an Authorized Officer on
or before 11:00 a.m., Chicago, Illinois time, on the Banking Day of the
requested Borrowing.  Each request shall specify (i) the borrowing date, which
day shall be a Banking Day and (ii) the amount of requested Borrowing.

      SECTION 2.8.  Proceeds.  Subject to the other provisions of this
                    --------                                                  
Agreement, the Bank will pay to the Company the amount of a Borrowing on the
date designated in the request therefor upon receipt of the documents required
under Sections 5.1 and 5.2 with respect to such Borrowing.  Each Borrowing of
      ------------     ---                                                   
Reference Rate Loans, Quoted Rate Loans and Eurodollar Rate Loans shall be
disbursed in Dollars, on the applicable borrowing date, to the Company through
its account with the Bank or if no such account exists, to such account as the
Company shall direct.  Each Eurocurrency Rate Loan shall be disbursed in the
currency specified by the Company, at such branch or affiliate of the Bank or
such other bank as the Bank may select.

      SECTION 2.9.  Continuation and Conversion Elections.  By requesting in
                    -------------------------------------                   
writing or by telephone (promptly confirmed in writing as hereinafter provided)
to the Bank on or before 11:00 a.m., Chicago, Illinois time, on a Banking Day,
the Company may from time to time irrevocably elect that all or a portion of one
Type of Loans be continued as such Type or converted into another Type of Loans,
in accordance with the

                                     -80-

 
applicable provisions of this Section 2.4; provided, however, that (i) the
                              -----------  --------  -------              
aggregate dollar amount of Loans which may be converted and/or continued at any
one time shall not be less than (a) in the case of Reference Rate Loans, a
minimum aggregate amount of $50,000 and multiples of $200,000, and (b) in the
case of Fixed Rate Loans of any Type, a minimum aggregate amount of $200,000 and
multiples of $200,000, and (ii) no portion of the outstanding principal amount
of any Loans may be continued as, or be converted into, Fixed Rate Loans when
any Default has occurred and is continuing.  Each telephonic or other oral
conversion or continuation request referred to in Section 2.9.1 or Section 2.9.2
                                                  -------------    -------------
shall be promptly confirmed in writing by delivery to the Bank of a duly
completed Conversion/Continuation Notice duly executed by an Authorized Officer
of the Company not later than three (3) Banking Days after the date of any such
oral request.  In the absence of receipt of a telephonic or written request for
continuation or conversion with respect to any Fixed Rate Loan in accordance
with the provisions of Section 2.9.1 or 2.9.2, as applicable, such Fixed Rate
                       -------------    -----                                
Loan shall, on such last day, automatically convert to a Reference Rate Loan.
Each conversion or continuation of a Loan in one currency (the "Prior Currency")
into a Loan in another currency (the "Second Currency") shall result in a Loan
in an amount denominated in the Second Currency equal to the equivalent in the
Second Currency of the Loan amount denominated in the Prior Currency, in each
case determined by the Bank in accordance with the provisions of Section 2.10.
                                                                 ------------

           SECTION 2.9.1.  Eurocurrency Rate Loans, Eurodollar Rate Loans and
                           --------------------------------------------------
      Reference Rate Loans.  Subject to the other provisions of this Agreement,
      --------------------                                                     
      the Company may elect: (a) to continue all or any portion of any
      outstanding Eurodollar Rate Loans or Eurocurrency Rate Loans from the
      current Interest Period of such Loans into a subsequent Interest Period to
      begin on the last day of such current Interest Period and in the same
      currency or, in the case of Eurocurrency Rate Loans, in the same or a
      different Eurocurrency, (b) to convert any outstanding Reference Rate
      Loans into Eurodollar Rate Loans or Eurocurrency Rate Loans or (c) to
      convert one Type of Fixed Rate Loan into any other Type of Loan except a
      Quoted Rate Loan, such conversion to occur on the last day of the then
      current Interest Period of the Loans being converted.  The Company shall
      give the Bank prior telephonic notice (promptly confirmed in writing) from
      an Authorized Officer (x) at least two (2) Banking Days' prior to the date
      of continuation or conversion in the case of continuation of or conversion
      into a Eurodollar Rate Loan bearing interest with reference to the
      Interbank Rate and (y) at least three (3) Banking Days' prior to the date
      of continuation or conversion in the case of continuation of or conversion
      into a Eurocurrency Rate Loan [whether bearing interest with reference to
      the Interbank Rate (Reserve Adjusted) or the LIBOR Rate (Reserve
      Adjusted)] or into a Eurodollar Rate Loan bearing interest with reference
      to the LIBOR Rate.  Each such notice shall specify whether such Loan bears
      interest with reference to the Interbank Rate or the LIBOR Rate, the date,
      the amount and the Interest Period, if applicable, and, in the case of a
      continuation of or conversion into Eurocurrency Rate Loans, the currency
      of the such Loans.

           SECTION 2.9.2.  Quoted Rate Loans.  Subject to the other provisions
                           -----------------                                  
      of this Agreement, the Company may elect (a) to continue all or any
      portion of any outstanding Quoted Rate Loans from the current Interest
      Period of such Loans into a subsequent Interest Period to begin on the
      last day of such current Interest Period and in the same currency, (b) to
      convert all or any portion of any outstanding Eurodollar Rate Loans or
      Eurocurrency Rate Loans to Quoted Rate Loans, such conversion to occur on
      the last day of the then current Interest Period of the Loans being
      converted, or (c) to convert all or any portion of any outstanding
      Reference Rate Loans into Quoted Rate Loans.  If the Company desires to
      continue or convert outstanding Loans as or into Quoted Rate Loans, the
      Company shall give the Bank prior telephonic notice (promptly confirmed in
      writing) from an Authorized Officer of the Company of a requested
      continuation or conversion under this Section 2.9.2, specifying the date,
                                            -------------                      
      amount and Type of Loans to be continued or converted, the applicable
      Interest Periods and requesting that the Bank provide the Company by
      telephone a quotation of the interest rate(s) that would be applicable to
      the requested Quoted Rate Loans for Interest Period(s) of a duration
      designated by such Authorized Officer and commencing (a) on the last day
      of the current Interest Period in the case of outstanding Fixed Rate Loans
      or (b) on the date such rate quotation is requested in the case of
      outstanding Reference Rate Loans. Each such notice and request from the
      Company, to be effective, must be received by the Bank no later than 11:00
      a.m., Chicago, Illinois time on the Banking Day such conversion into or
      continuation of Quoted Rate Loans is to occur. If such interest rate is
      satisfactory to the Company an Authorized Officer shall, no later than
      11:00 

                                     -81-

 
      a.m. Chicago, Illinois time, on such date, so indicate. Such indication by
      an Authorized Officer of the Company shall constitute an irrevocable
      request that the requested continuation of or conversion into Quoted Rate
      Loans be consummated at the rate the Bank quoted or would have quoted to
      the Company at the time of such indication of acceptance, it being
      understood that the Bank does not guarantee that the interest rate quoted
      with respect to a particular requested conversion of or continuation into
      Quoted Rate Loans shall continue to be available if such rate is not
      accepted by an Authorized Officer of the Company at the time of quotation.

      SECTION 2.10.  Currency Equivalents.
                     -------------------- 

           (a)  Exchange Rate.  Whenever pursuant hereto the Dollar Equivalent
                -------------    
      of an amount denominated in any currency other than Dollars is to be
      determined as of a date, such determination shall be made at the spot rate
      at which the Bank offers to purchase such currency with Dollars at
      approximately 10:00 am., Chicago, Illinois time on such date. Whenever the
      equivalent in any currency (other than Dollars) is to be determined as of
      a date, such determination shall be made in accordance with the preceding
      sentence, substituting such currency in which such equivalent is being
      determined for Dollars.

           (b)  Determination Date.  For purposes of determining the Commitment
                ------------------                                             
      Fee referred to in Section 3.3.1, the outstanding balance of the Revolving
                         -------------                                          
      Loans and the Revolving Credit Commitment from time to time, the Dollar
      Equivalent of each Loan then denominated in a currency other than Dollars
      shall be determined as of each of the dates (a "Determination Date") as
      follows:

                (i)   the date ten (10) Banking Days prior to  the last day of
           each calendar quarter of each calendar year; and

                (ii)  the date five (5) Banking Days prior to each of the
           following dates (unless such of the following dates is also the last
           day of any calendar quarter of any calendar year;

                (A)   the date a Loan is made;

                (B)   the date a Eurodollar Rate Loan or Eurocurrency Rate Loan
                      is continued from the current Interest Period of such Loan
                      into a subsequent Interest Period;

                (C)   the date an outstanding Loan is converted from one Type of
                      Loan into another Type of Loan; or

                (D)   the date the principal of a Loan, or portion thereof, is
                      paid or prepaid.

      The Dollar Equivalent of any Loan, or portion thereof, determined as of
      any Determination Date, shall be deemed to remain unchanged from such
      determination until the next succeeding Determination Date.

      SECTION 2.11.  Funding.  As to any Eurodollar Rate Loan or Eurocurrency
                     -------                                                 
Rate Loan the Bank may, if it so elects, fulfill its obligation to make,
continue or convert such Fixed Rate Loans hereunder by causing one of its
foreign branches or Related Parties (or an international banking facility
created by the Bank) to make or maintain such Fixed Rate Loan; provided,
                                                               -------- 
however, that such Fixed Rate Loan shall nonetheless be deemed to have been made
- -------                                                                         
and to be held by the Bank, and the obligation of the Company to repay such
Fixed Rate Loan shall nevertheless be to the Bank account of such
foreign branch, Related Party or 

                                     -82-

 
international banking facility. In addition, the Company hereby consents and
agrees that, for purposes of any determination to be made hereunder, it shall be
conclusively assumed that the Bank elected to fund all Eurodollar Rate Loans and
all Eurocurrency Rate Loans by purchasing Eurodollar deposits, or deposits in
the applicable Eurocurrency, in its Interbank Lending Office's or LIBOR Lending
Office's interbank eurocurrency market.

      SECTION 2.12.  Notes.  The Revolving Loans made by the Bank to the Company
                     -----                                                      
under this Agreement shall be evidenced by the Revolving Note made by the
Company payable to the order of the Bank in the maximum amount of the Bank's
Revolving Credit Commitment.  The Term Loan made by the Bank to the Company
under this Agreement shall be evidenced by the Term Note made by the Company
payable to the order of the Bank in the maximum amount of the Bank's Term
Commitment or if less, the actual amount of the Term Loan made to the Company.
The Company hereby irrevocably authorizes the Bank to make (or cause to be made)
appropriate notations on the grid attached to each Note (or on any continuation
of such grid), which notations, if made, shall evidence, inter alia, the date
                                                         ----- ----          
of, the outstanding principal of, and the interest rate and Interest Period
applicable to the Loans evidenced thereby.  Such notations shall be conclusive
and binding on the Company absent manifest error; provided, however, that the
                                                  --------  -------          
failure of the Bank to make any such notations shall not limit or otherwise
affect any Obligations of the Company.


                                  ARTICLE III

                  REPAYMENTS, PREPAYMENTS, INTEREST AND FEES


      SECTION 3.1.  Repayments and Prepayments.  The Company  shall repay in
                    --------------------------                              
full the unpaid principal amount of each Revolving Loan no later than the
Revolving Commitment Termination Date.  The Company shall repay the unpaid
principal amount of the Term Loan in twenty (20) consecutive quarterly
installments, each on a Quarterly Payment Date, commencing with the first such
Quarterly Payment Date following the making of the Term Loan, and each such
installment in the amount of $750,000 with the final such payment due and
payable on the Term Commitment Termination Date in the principal amount of the
Term Loan then outstanding.  Prior to the Revolving Commitment Termination Date
or the Term Commitment Termination Date, as the case may be, the Company

           (a)  may, from time to time on any Banking Day, make a voluntary
      prepayment, in whole or in part, of the outstanding principal amount of
      any Loans; provided, however, that
                 --------  -------      

                (i)    no such prepayment of any Fixed Rate Loan may be made on
           any day other than the last day of the Interest Period for such Loan
           or portion thereof;

                (ii)   all such voluntary prepayments shall require at least
           three (3) Banking Days' prior written notice to the Bank;

                (iii)  all such voluntary partial prepayments shall be in an
           aggregate minimum amount of $50,000 and an integral multiple of
           $50,000;

                (iv)   no amount of the Term Loan which is paid or prepaid may
           be reborrowed; and

                (v)    All prepayments of the Term Loan shall be applied to the
           installments of the Term Loan in the inverse order of their
           maturities.

           (b)  shall, on each date when any reduction in the Commitment Amount
      shall become effective, including pursuant to Section 2.2, make a
                                                    -----------        
      mandatory prepayment of all Loans such that the aggregate amount so
      prepaid shall be equal to the excess, if any, of the aggregate,
      outstanding principal amount of all Loans over the Commitment Amount as so
      reduced; and

                                     -83-

 
           (c)  shall, immediately upon any acceleration of the Loans pursuant
      to Section 8.2 or Section 8.3, repay all Loans; and
         -----------    -----------                      

           (d)  shall, if on any Determination Date, as a result of an increase
      in the value of a Eurocurrency, the aggregate Dollar Equivalent of the
      principal amount of all outstanding Loans to the Company exceeds the
      Commitment Amount, on the last day of the Interest Period during which
      such Determination Date occurs, make a mandatory prepayment of the
      aggregate outstanding Revolving Loans to the Company such that the
      aggregate amount of prepayments shall be equal to the amount of such
      excess.

Each prepayment of any Loans made pursuant to this Section shall be without
premium or penalty, except as may be required by Section 4.5.  No voluntary
                                                 -----------               
prepayment of principal of any Revolving Loans shall cause a reduction in the
Revolving Credit Commitment.

      SECTION 3.2.  Interest Provisions.  Interest on the outstanding principal
                    -------------------                                        
amount of Loans shall accrue and be payable in accordance with this Section 3.2.
                                                                    ----------- 

           SECTION 3.2.1.  Rates.
                           ----- 

                (a)  Reference Rate Loans.  That portion of the Loans maintained
                     --------------------                                       
           from time to time as a Reference Rate Loans shall accrue and bear
           interest until maturity at a rate per annum equal to (i) the
           Reference Rate from time to time in effect minus one-half of one
                                                      -----                
           percent (0.50%) with respect to the Revolving Loans and (ii) the
           Reference Rate from time to time in effect minus one-quarter of one
                                                      -----                   
           percent (0.25%) with respect to the Term Loan.

                (b)  Eurodollar Rate Loans and Eurocurrency Rate Loans.  That
                     -------------------------------------------------       
           portion of the Loans maintained from time to time as a Eurodollar
           Rate Loans or Eurocurrency Rate Loans shall accrue and bear interest,
           during each Interest Period applicable thereto, at a rate per annum
           equal to the sum of the Interbank Rate (Reserve Adjusted) or the
           LIBOR Rate (Reserve Adjusted), as the case may be for such Interest
           Period plus (i) one percent (1.0%) with respect to the Revolving
                  ----                                                     
           Loans and (ii) one and thirty-five one hundredth of one percent
           (1.35%) with respect to the Term Loan.

                (c) Quoted Rate Loans.  That portion of the Loans maintained
                    -----------------                                       
           from time to time as Quoted Rate Loans shall accrue and bear
           interest, during each Interest Period applicable thereto, at a rate
           per annum equal to the Quoted Rate in effect for such Interest
           Period.

           SECTION 3.2.2.  Post-Maturity Rates.  After the date any principal
                           -------------------                               
      amount of any Loan is due and payable (whether at maturity, upon
      acceleration or otherwise), the Company shall pay, but only to the extent
      permitted by law, interest (after as well as before judgment) on such Loan
      at a rate per annum equal to the greater of (a) two percent (2.0%) in
      excess of the rate applicable to the unpaid amount of such Loan
      immediately before it became due and (b) the Reference Rate in effect from
      time to time plus two percent (2.0%).
                   ----                    

           SECTION 3.2.3.  Payment Dates.  Interest accrued on each Loan shall
                           -------------                                      
      be payable, without duplication:

                (a)  on the Revolving Commitment Termination Date with respect
           to the Revolving Loans and the Term Commitment Termination Date with
           respect to the Term Loan, as the case may be.

                                     -84-

 
                (b)  on the date of any payment or prepayment, in whole or in
           part, of principal outstanding on such Loan as the result of a
           reduction in the Commitment Amount pursuant to Section 2.2;
                                                          ----------- 

                (c)  with respect to Reference Rate Loans, on each Monthly
           Payment Date occurring after the making of such Loan;

                (d)  subject to clauses (g) and (h) below, with respect to Fixed
                                -----------     ---                             
           Rate Loans, on the last day of each applicable Interest Period;

                (e)  with respect to any Reference Rate Loans converted into
           Fixed Rate Loans on a day when interest would not otherwise have been
           payable pursuant to clause (c), on the date of such conversion;
                               ----------                                 

                (f)  Upon the acceleration of the Revolving Commitment
           Termination Date or the Term Commitment Termination Date, as the case
           may be, pursuant to Article VIII, immediately upon such acceleration.

                (g)  with respect to any Eurodollar Loan or Eurocurrency Loan
           having an Interest Period of six months, the last day of the third
           month of such Interest Period and the last day of such Interest
           Period; and

                (h)  with respect to Quoted Rate Loans, on the earlier to occur
           of (i) the Monthly Payment Date occurring after the making of such
           Loan or (ii) the last day of each applicable Interest Period.

      Interest accrued on Loans or other monetary Obligations arising under this
      Agreement or any other Loan Document after the date such amount is due and
      payable shall be payable upon demand.

      SECTION 3.3.  Fees.  The Company agrees to pay the fees set forth in this
                    ----                                                       
Section 3.3.  All such fees shall be non-refundable.
- -----------                                         

           SECTION 3.3.1.  Commitment Fee.  The Company agrees to pay to the
                           --------------                                   
      Bank, for the period (including any portion thereof when its Commitment is
      suspended by reason of the Company's inability to satisfy any condition of
      Article V) commencing on the Effective Date and continuing through the
      ---------                                                             
      Revolving Credit Termination Date, a commitment fee at the rate of one-
      eighth of one percent (0.125%) per annum on the average daily unused
      portion of the Revolving Credit Commitment.  Such Commitment Fees shall be
      payable by the Company in arrears on each Monthly Payment Date, commencing
      with the first such day following the Effective Date, and on the Revolving
      Credit Commitment Date for the period then ending.

           SECTION 3.3.2.  Closing Fee.  The Company agrees to pay to the Bank a
                           -----------                                          
      Closing Fee of Fifty Thousand Dollars ($50,000).  Such Fee shall be
      payable, in full, upon the execution by the Bank and the Company of this
      Agreement.

      SECTION 3.4.  Computation of Interest and Fees.  All Fixed Rate Loans
                    --------------------------------                       
shall bear interest from and including the first day of the applicable Interest
Period to (but not including) the last day of such Interest Period at the
interest rate determined as applicable to such Fixed Rate Loan.  Interest on
each Reference Rate Loan, each Fixed Rate Loan and any fees, shall be computed
on the basis of a year consisting of 360 days and paid for actual days elapsed.

                                     -85-

 
                                  ARTICLE IV

                  CERTAIN INTEREST RATE AND OTHER PROVISIONS


      SECTION 4.1.  Fixed Rate Lending Unlawful.  If the Bank  shall determine
                    ---------------------------                               
that the introduction of or any change in or in the interpretation of any law
makes it unlawful, or any central bank or other governmental authority asserts
that it is unlawful, for the Bank to make, continue or maintain any Loan as, or
to convert any Loan into, a Fixed Rate Loan of a certain Type, the obligations
of the Bank to make, continue, maintain or convert any such Loans shall, upon
such determination, forthwith be suspended until the Bank shall notify the
Company that the circumstances causing such suspension no longer exist, and all
Fixed Rate Loans of such Type shall automatically convert into Reference Rate
Loans or, subject to compliance with the applicable provisions of Section 2.9,
                                                                  ----------- 
another Type of Fixed Rate Loans, at the end of the then current Interest
Periods with respect thereto or sooner, if required by such law or assertion.

      SECTION 4.2.  Deposits Unavailable.  If the Bank has determined that
                    --------------------                                  

           (a)  Dollar or Eurocurrency deposits, as the case may be, in the
      relevant amount and for the relevant Interest Period are not available to
      the Bank in its relevant market; or

           (b)  by reason of circumstances affecting the Bank's relevant market,
      adequate means do not exist for ascertaining the interest rate applicable
      hereunder to Fixed Rate Loans of a particular Type,

then, upon notice from the Bank to the Company, the obligations of the Bank to
- ----                                                                          
make or continue any Loans as, or to convert any Loans into, Fixed Rate Loans of
such Type shall forthwith be suspended until the Bank shall have notified the
Company that the circumstances causing such suspension no longer exist.

      SECTION 4.3.  Increased Capital Costs With Respect to Commitments. If any
                    ----------------------------------------------------       
change in, or the introduction, adoption, effectiveness, interpretation,
reinterpretation or phase-in of, any law or regulation, directive, guideline,
decision or request (whether or not having the force of law) of any court,
central bank, regulator or other governmental authority affects or would affect
the amount of capital required or expected to be maintained by the Bank or any
Person controlling the Bank, and the Bank determines (in its sole and absolute
discretion) that the rate of return on its or such controlling Person's capital
as a consequence of its Commitment or the Loans made by the Bank is reduced to a
level below that which the Bank or such controlling Person could have achieved
but for the occurrence of any such circumstance, then, in any such case upon
notice from time to time by the Bank to the Company the Company agrees that it
shall immediately pay to the Bank additional amounts sufficient to compensate
the Bank or such controlling Person for such reduction in rate of return at the
time suffered or incurred.  A statement of the Bank as to any such additional
amount or amounts (including calculations thereof in reasonable detail) shall,
in the absence of manifest error, be conclusive and binding on the Company.  In
determining such amount, the Bank may use any reasonable method of averaging and
attribution that it (in its sole and absolute discretion) shall deem applicable.

      SECTION 4.4.  Funding Losses.  In the event the Bank shall incur any loss
                    --------------                                             
or expense (including any loss or expense incurred by reason of the liquidation
or reemployment of deposits or other funds acquired by the Bank to make,
continue or maintain any portion of the principal amount of any Loan as, or to
convert any portion of the principal amount of any Loan into, a Fixed Rate Loan)
as a result of

           (a)  any conversion or repayment or prepayment of the principal
      amount of any Fixed Rate Loans on a date other than the scheduled last day
      of the Interest Period applicable thereto;

           (b)  any Loans not being made as Fixed Rate Loans in accordance with
      the Borrowing Request therefor; or

                                     -86-

 
           (c)  any Loans not being continued as, or converted into, Fixed Rate
      Loans in accordance with the Continuation/ Conversion Notice therefor,

then, upon the written notice of the Bank to the Company, the Company agrees
that it shall, within five (5) Banking Days of the Company's receipt thereof,
pay to the Bank such amount as will (in the reasonable determination of the
Bank) reimburse the Bank for such loss or expense.  Such written notice (which
shall include calculations in reasonable detail) shall, in the absence of
manifest error, be conclusive and binding on the Company.

      SECTION 4.5.  Taxes.  All payments by the Company of principal of, and
                    -----                                                   
interest on, the Loans and all other amounts payable hereunder shall be made
free and clear of and without deduction for any present or future income,
excise, stamp or franchise taxes and other taxes, fees, duties, withholdings or
other charges of any nature whatsoever imposed by any taxing authority, but
excluding franchise taxes and taxes imposed on or measured by the Bank's net
income or receipts (such non-excluded items being called "Taxes").  In the event
that any withholding or deduction from any payment to be made by the Company
hereunder is required in respect of any Taxes pursuant to any applicable law,
rule or regulation, then the Company will

           (a)  pay directly to the relevant authority the full amount required
      to be so withheld or deducted;

           (b)  promptly forward to the Bank an official receipt or other
      documentation satisfactory to the Bank evidencing such payment to such
      authority; and

           (c)  pay to the Bank such additional amount or amounts as is
      necessary to ensure that the net amount actually received by the Bank will
      equal the full amount the Bank would have received had no such withholding
      or deduction been required.

Moreover, if any Taxes are directly asserted against the Bank with respect to
any payment received by the Bank hereunder, the Bank may pay such Taxes and the
Company agrees that it will promptly pay such additional amounts (including any
penalties, interest or expenses) as is necessary in order that the net amount
received by the Bank after the payment of such Taxes (including any Taxes on
such additional amount) shall equal the amount the Bank would have received had
not such Taxes been asserted; excluding, however, all such amounts which are so
                              ---------  -------                               
payable due to the negligence of the Bank.

      If the Company fails to pay any Taxes when due to the appropriate taxing
authority or fails to remit to the Bank, the required receipts or other required
documentary evidence, the Company agrees to indemnify the Bank for any
incremental Taxes, interest or penalties that may become payable by the Bank as
a result of any such failure.

      If the Bank receives a refund of any amount paid by the Company pursuant
to this Section in respect of amounts required to be withheld or deducted from
amounts due to the Bank under this Agreement and the other Loan Documents, and
if as a result of the Bank's receipt of such refund the net amount received by
the Bank exceeds the amount to which the Bank is entitled under this Agreement
and the other Loan Documents, the Bank shall promptly pay to the Company the
amount of such excess.

      SECTION 4.6.  Payments, Computations, etc.  Unless otherwise expressly
                    ---------------------------                             
provided, all payments by the Company pursuant to this Agreement, the Notes or
any other Loan Document shall be made by the Company to the Bank.  All such
payments required to be made to the Bank shall be made, without setoff,
deduction or counterclaim, not later than 12:30 p.m., Chicago, Illinois time, on
the date due, in same day or immediately available funds, to such account as the
Bank shall specify from time to time by notice to the Company. Funds received
after that time shall be deemed to have been received by the Bank on the next
succeeding Banking Day. The Company hereby authorizes the Bank and the Bank may,
in its sole and absolute discretion, provide for the payment of any amounts
required to be paid in Dollars which are due under this Agreement or the other
Loan Documents, by debiting the Demand Deposit Account for the amount

                                     -87-

 
then due; provided, however, that the failure of the Company to maintain
          --------  ------- 
sufficient balances in the Demand Deposit Account to provide for such payment
shall not affect the Company's obligation to pay when due all amounts payable by
the Company hereunder or under any other Loan Document. Whenever any payment to
be made shall otherwise be due on a day which is not a Banking Day, such payment
shall (except as otherwise required by clause (c) of the definition of the term
                                       ----------
"Interest Period" with respect to Eurodollar Rate Loans or Eurocurrency Rate
Loans) be made on the next succeeding Banking Day and such extension of time
shall be included in computing interest and fees, if any, in connection with
such payment.

      SECTION 4.7.  Setoff.  The Bank shall, upon the occurrence of any Event of
                    ------                                                      
Default, have the right to appropriate and apply to the payment of the
Obligations (whether or not then due), any and all balances, credits, deposits,
accounts or moneys of the Company then or thereafter maintained with the Bank.
The Bank agrees promptly to notify the Company after any such setoff and
application; provided, however, that the failure to give such notice shall not
             --------  -------                                                
affect the validity of such setoff and application.  The rights of the Bank
under this Section are in addition to other rights and remedies (including other
rights of setoff under applicable law or otherwise) which the Bank may have.

      SECTION 4.8.  Use of Proceeds.  The Company will use the proceeds of the
                    ---------------                                           
Loans for general operating capital.

      SECTION 4.9.  Currency Indemnification.  The obligation of the Company to
                    ------------------------                                   
make payments hereunder in the currencies specified in Article III shall not be
discharged as satisfied by any tender or recovery which is expressed in any
other currencies except to the extent that such tender or recovery shall result
in the actual receipt by the Bank of the full amount in the currencies so
specified payable hereunder.  The Company's obligations to make payments in the
currencies so specified shall be enforceable as an alternative or additional
cause of action for the purpose of recovery in such currencies of the amount, if
any, by which such actual receipt shall fall short of the full amount in such
currencies payable hereunder, and shall not be affected by judgment being
obtained for any sums due hereunder.

      Without limiting the generality of the previous paragraph, the Company
agrees to indemnify the Bank against any loss incurred by it as a result of any
judgment or order being given or made for the payment of any Indebtedness
hereunder and such judgment or order being expressed in a currency other than
the currency of the Indebtedness hereunder and as a result of any variation
having occurred in rates of exchange between the date of any such amount
becoming due hereunder and the date of actual payment thereof.  The foregoing
indemnity shall constitute a separate and independent obligation and shall apply
irrespective of any indulgence granted from time to time and shall continue in
full force and effect notwithstanding any such judgment or order as aforesaid.


                                   ARTICLE V

                            CONDITIONS TO BORROWING


      SECTION 5.1.  Initial Borrowing of the Company.  The obligation of the
                    --------------------------------                        
Bank to fund an initial Borrowing of the Company shall be subject to the prior
or concurrent satisfaction of each of the conditions precedent set forth in this
Section 5.1, in addition to the applicable conditions precedent set forth in
- -----------                                                                 
Section 5.2.
- ----------- 

           SECTION 5.1.1.  Secretary's Certificate.  The Bank shall have
                           -----------------------                      
      received from the Company, a certificate, dated the date of the initial
      Borrowing, of its Secretary or Assistant Secretary as to

                (a)  resolutions of its Board of Directors then in full force
           and effect authorizing the execution, delivery and performance of
           this Agreement and the Notes and authorizing the borrowings hereunder
           and each other Loan Document to be executed by it;

                                     -88-

 
                (b)  all documents evidencing other corporate action necessary
           for the execution, delivery and performance of any Loan Document;

                (c)  all approvals or consents, if any, with respect to this
           Agreement and the Notes;

                (d)  the Articles of Incorporation and By-laws of the Company,
           as duly adopted and then in effect, copies of which Articles of
           Incorporation and By-Laws shall be attached to such certificate; and

                (e)  the incumbency and signatures of those of its officers
           authorized to sign to this Agreement, the Notes and each other Loan
           Document executed by it,

      upon which certificate the Bank may conclusively rely until it shall have
      received a further certificate of the Secretary of the Company canceling
      or amending such prior certificate.

           SECTION 5.1.2.  Delivery of Notes.  The Bank shall have received the
                           -----------------                                   
      Notes of the Company duly executed and delivered by the Company.

           SECTION 5.1.3.  Opinion of Counsel.  The Bank shall have received an
                           ------------------                                  
      opinion from Loreen P. Collins, counsel to the Company, substantially in
      the form of Exhibit F hereto;
                  ---------        

           SECTION 5.1.4.  Letter of Awareness.  The Bank shall have received a
                           -------------------                                 
      letter of awareness from DowElanco, in form and substance satisfactory to
      the Bank.

           SECTION 5.1.5.  Good Standing.  The Bank shall have received a
                           -------------                                 
      certificate of Good Standing issued by the Office of the Secretary of
      State of  California, of recent date, and attesting to the good standing
      of the Company under the laws of the State of California.

           SECTION 5.1.6.  Expenses, etc.  The Bank shall have received all
                           -------------                                   
      reasonable fees, costs and expenses due and payable pursuant to Section
                                                                      -------
      9.3, if then invoiced.
      ---                   

           SECTION 5.1.7.  Closing Fee.  The Bank shall have received the
                           -----------                                   
      Closing Fee referred to in Section 3.3.2 hereof.
                                 -------------        

           SECTION 5.1.8.  Compliance Certificate.  The Bank shall have received
                           ----------------------                               
      a duly completed Compliance Certificate and all matters thereon shall be
      satisfactory to the Bank.

      SECTION 5.2.  All Borrowings.  The obligation of the Bank to fund any
                    --------------                                         
Borrowing (including the initial Borrowing) shall be subject to the satisfaction
of each of the conditions precedent set forth in this Section 5.2.
                                                      ----------- 

           SECTION 5.2.1.  Compliance with Warranties, No Default, etc.  Both
                           -------------------------------------------       
      before and after giving effect to any Borrowing the following statements
      shall be true and correct:

                (a)  the representations and warranties set forth in Article VI
                                                                     ----------
           shall be true and correct with the same effect as if then made
           (unless stated to relate solely to an early date, in which case such
           representations and warranties shall be true and correct as of such
           earlier date) except for such changes as are specifically permitted
           hereunder; and

                (b)  no Default shall have then occurred and be continuing or
           shall result from such Borrowing.

                                     -89-

 
           SECTION 5.2.2.  Borrowing Request.  The Bank shall have received a
                           -----------------                                 
      request for such Borrowing in accordance with Section 2.3 or Section 2.4,
                                                    -----------    ----------- 
      as the case may be.  Each request for a Borrowing and the acceptance by
      the Company of the proceeds of such Borrowing shall constitute a
      representation and warranty by the Company that on the date of such
      Borrowing (both immediately before and after giving effect to such
      Borrowing and the application of the proceeds thereof) the statements made
      in Section 5.2.1 are true and correct.
         -------------                      

           SECTION 5.2.3.  Satisfactory Legal Form.  All documents executed or
                           -----------------------                            
      submitted pursuant hereto by or on behalf of the Company shall be
      satisfactory in form and substance to the Bank and its counsel; the Bank
      and its counsel shall have received all information, approvals, opinions,
      documents or instruments as the Bank or its counsel may reasonably
      request.


                                  ARTICLE VI

                        REPRESENTATIONS AND WARRANTIES


      In order to induce the Bank to enter into this Agreement and to make Loans
hereunder, the Company represents and warrants unto the Bank as set forth in
this Article VI.
     ---------- 

      SECTION 6.1.  Organization, etc.  The Company and each of its Subsidiaries
                    -----------------                                           
is a corporation validly organized and existing and in good standing under the
laws of the jurisdiction of its incorporation or formation and is duly qualified
to do business and is in good standing as a foreign corporation in each
jurisdiction where the nature of its business requires such qualification,
except such jurisdictions where failure to so qualify and be in good standing is
not reasonably likely to have a material adverse effect on the operations or
financial condition of the Company and its Subsidiaries taken as a whole.  The
Company has full power and authority and holds all requisite governmental
consents and other approvals to enter into, deliver and perform the Obligations
under this Agreement, the Notes and each other Loan Document to which it is a
party and to own and hold under lease its property and to conduct its business
substantially as currently conducted by it.

      SECTION 6.2.  Due Authorization, Non-Contravention, etc.  The execution,
                    -----------------------------------------                 
delivery and performance by the Company of this Agreement, the Notes and each
other Loan Document executed or to be executed by it are within the Company's
corporate powers, have been duly authorized by all necessary corporate action,
and do not (a) contravene the Company's Organic Documents; (b) contravene any
contractual restriction, law or governmental regulation or court decree or order
binding on the Company; or (c) result in, or require the creation or imposition
of, any Lien on any of the Company's properties.

      SECTION 6.3.  Government Approval, Regulation, etc.  The Company and its
                    ------------------------------------                      
Subsidiaries are in material compliance with all statutes and governmental rules
and regulations applicable to them and no authorization or approval or other
action by, and no notice to or filing with, any governmental authority or
regulatory body or other Person is required for the due execution, delivery or
performance by the Company, of this Agreement, the Notes or any other Loan
Document.  Neither the Company nor any of its Subsidiaries is an "investment
company" within the meaning of the Investment Company Act of 1940, as amended,
or a "holding company", or a "subsidiary company" of a "holding company", or an
"affiliate" of a "holding company" or of a "subsidiary company" of a "holding
company", within the meaning of the Public Utility Holding Company Act of 1935,
as amended.

      SECTION 6.4.  Validity, etc.  This Agreement, the Notes and each other
                    -------------                                           
Loan Document executed by the Company, constitute the legal, valid and binding
obligations of the Company, enforceable in accordance with their respective
terms, except as enforceability may be limited by bankruptcy, insolvency or
other similar laws of general application affecting the enforcement of
creditors' rights or by general principles of equity limiting the availability
of equitable remedies.

                                     -90-

 
      SECTION 6.5.  Financial Information.  The audited consolidated balance
                    ---------------------                                   
sheets of the Company and its Subsidiaries as at August 31, 1996, and the
related statements of earnings and cash flow of the Company and its
Subsidiaries, copies of which have been furnished to the Bank, have been
prepared in accordance with GAAP consistently applied, and present fairly the
consolidated financial condition of the corporations covered thereby as at the
date thereof and the results of their operations for the period then ended.

      SECTION 6.6.  No Material Adverse Change.  Since the dates of the
                    --------------------------                         
financial statements described in Section 6.5, there has been no material
                                  -----------                            
adverse change in the financial condition, operations, assets, business,
properties or prospects of the Company and its Subsidiaries taken as a whole.

      SECTION 6.7.  Litigation, Labor Controversies, etc.  There is no pending
                    ------------------------------------                      
or, to the knowledge of the Company, threatened litigation, action or proceeding
against the Company or any of its Subsidiaries, or labor controversy involving
the Company or any of its Subsidiaries, or any of their respective properties,
which might reasonably be expected to materially adversely affect the financial
condition, operations, assets, business, properties or prospects of the Company
and its Subsidiaries taken as a whole or which purports to affect the legality,
validity or enforceability of this Agreement, the Notes or any other Loan
Document, except as disclosed on the Company's Form 10K dated August 31, 1996 as
filed with the Securities and Exchange Commission, Washington, D.C., in Schedule
                                                                        --------
6.7 or in Schedule 6.14.
- ---       ------------- 

      SECTION 6.8.  Subsidiaries.  The Company has no Subsidiaries, except those
                    ------------                                                
Subsidiaries which are identified in Schedule 6.8.
                                     ------------ 

      SECTION 6.9.  Partnerships; Joint Ventures.  Neither the Company nor any
                    ----------------------------                              
of its Subsidiaries is a partner or a joint venturer in any partnership or joint
venture other than the partnerships and joint ventures which are identified in
Schedule 6.9.
- ------------ 

      SECTION 6.10. Ownership of Properties.  The Company and each of its
                    -----------------------                              
Subsidiaries owns good and marketable title to all of its properties and assets,
real and personal, tangible and intangible, of any nature whatsoever (including
patents, trademarks, trade names, service marks and copyrights), free and clear
of all material Liens, charges or claims (including infringement claims with
respect to patents, trademarks, copyrights and the like) except as (a) permitted
pursuant to Section 7.2.5 or (b) disclosed in the Company's SEC Form 10K dated
            -------------                                                     
August 31, 1996.

      SECTION 6.11. Taxes.  The Company and each of its Subsidiaries has filed
                    -----                                                     
all tax returns and reports required by law to have been filed by it and has
paid all taxes and governmental charges thereby shown to be owing, except any
such taxes or charges which are being diligently contested in good faith by
appropriate proceedings and for which adequate reserves in accordance with GAAP
shall have been set aside on its books.

      SECTION 6.12.  Insurance.  The Company and each of its Subsidiaries
                     ---------                                           
maintain insurance, including self-insurance, to such extent and against such
hazards and liabilities as is commonly maintained by companies similarly
situated.

      SECTION 6.13. Pension and Welfare Plans.  No Reportable Event has
                    -------------------------                          
occurred, no steps have been taken by the PBGC, the Company or an ERISA
Affiliate to terminate or withdraw from any Pension Plan, and no contribution
failure has occurred with respect to any Pension Plan sufficient to give rise to
a Lien under section 302(f) of ERISA.  No condition exists or event or
transaction has occurred with respect to any Pension Plan which might result in
the incurrence by the Company or any ERISA Affiliate of any material liability,
fine or penalty.  Except as disclosed in Schedule 6.13 neither the Company nor
                                         -------------                        
any ERISA Affiliate has any contingent liability with respect to any post-
retirement benefit under a Welfare Plan, other than liability for continuation
coverage described in Part 6 of Title I of ERISA.

                                     -91-

 
      SECTION 6.14.  Environmental Warranties.
                     ------------------------ 

            (a)  Except as disclosed in Schedule 6.14, neither the Company nor
                                        -------------                         
      any Subsidiary has received any notice to the effect, or has any
      knowledge, that its Property or operations are not in compliance with any
      of the requirements of applicable federal, state and local environmental,
      health and safety statutes and regulations ("Environmental Laws") or are
      the subject of any federal or state investigation evaluating whether any
      remedial action is needed to respond to a release of any toxic or
      hazardous waste or substance into the environment, which non-compliance or
      remedial action could have material adverse effect on the business,
      operations, Property, assets or conditions (financial or otherwise) of the
      Company or any Subsidiary;

            (b)  to the best of the Company's knowledge there have been no
      releases of hazardous materials at, on or under any Property now or
      previously owned or leased by the Company or any of its Subsidiaries that,
      singly or in the aggregate, have, or may reasonable be expected to  have,
      a material adverse effect on the financial condition, operations, assets,
      business, Properties or prospects of the Company and its Subsidiaries;

            (c)  to the best of the Company's knowledge there are no underground
      storage tanks, active or abandoned, including petroleum storage tanks, on
      or under any Property now or previously owned or leased by the Company or
      any of its Subsidiaries that, singly or in the aggregate, have, or may
      reasonably be expected to have, a material adverse effect on the financial
      condition, operations, assets, business, Properties or prospects of the
      Company and its Subsidiaries;

            (d)  to the best of the Company's knowledge neither the Company nor
      any Subsidiary of the Company has directly transported or directly
      arranged for the transportation of any hazardous material to any location
      which is listed or proposed for listing on the National Priorities List
      pursuant to CERCLA, on the CERCLIS or on any similar state list or which
      is the subject of federal, state or local enforcement actions or other
      investigations which may lead to material claims against the Company or
      such Subsidiary thereof for any remedial work, damage to natural resources
      or personal injury, including claims under CERCLA; and

            (e)  to the best of the Company's knowledge, except as disclosed on
      Schedule 6.14 no conditions exist at, on or under any Property now or
      -------------                                                        
      previously owned or leased by the Company which, with the passage of time,
      or the giving of notice or both, would give rise to liability under any
      Environmental Law.

      SECTION 6.15.  Regulations G, U and X.  The Company is not engaged
                     ----------------------                             
principally, or as one of its important activities, in the business of extending
credit for the purpose of, purchasing or carrying margin stock, and no proceeds
of any Loans will be used for a purpose which violates, or would be inconsistent
with, F.R.S. Board Regulation G, U or X.

      SECTION 6.16.  Accuracy of Information.  All factual information
                     -----------------------                          
heretofore or contemporaneously furnished by or on behalf of the Company in
writing to the Bank for purposes of or in connection with this Agreement or any
transaction contemplated hereby taken together does not, and all other such
factual information hereafter furnished by or on behalf of the Company to the
Bank taken together will not, on the date as of which such information is dated
or certified, contain any untrue statement of a material fact or omit a material
fact necessary to make the factual information contained therein not misleading
in light of the circumstances in which it was provided.

      SECTION 6.17.  No Default.  Neither the Company nor any Subsidiary is in
                     ----------                                               
default under any material agreement, contract or arrangement to which it is a
party or by which it or its properties may be bound.


                                  ARTICLE VII

                                     -92-

 
                                   COVENANTS


      SECTION 7.1.  Affirmative Covenants.  The Company agrees with the Bank
                    ---------------------                                   
that, until all Commitments have terminated and all Obligations have been paid
and performed in full, the Company will perform the obligations set forth in
this Section 7.1.
     ----------- 

           SECTION 7.1.1.  Financial Information, Reports, Notices, etc.  The
                           --------------------------------------------      
      Company will furnish, or will cause to be furnished, to the Bank copies of
      the following financial statements, reports, notices and information:

                (a)  as soon as available, and in any event within 45 days after
           the close of each quarterly fiscal period of the Company (i) a copy
           of consolidated balance sheets and profits and loss statements for
           the Company and its Subsidiaries (for such quarterly period and the
           year to date) for such period of the Company and for the
           corresponding periods of the preceding fiscal year, and (ii)
           consolidating balance sheets and profit and loss statements for the
           Company and each Subsidiary for the year to date, all in reasonable
           detail, prepared by the Company and certified by the chief financial
           officer of the Company;

                (b)  as soon as available, and in any event within 120 days
           after the close of each fiscal year of the Company, a copy of the
           audit report for such year and accompanying financial statements,
           including a consolidated balance sheet, reconciliation of changes in
           stockholders' equity, profit and loss statement and showing in
           comparative form the figures for the previous fiscal year of the
           Company, all in reasonable detail, accompanied by the unqualified
           opinion of Ernst & Young or other independent public accountants of
           nationally recognized standing selected by the Company and
           satisfactory to the Bank;

                (c)  as soon as available and in any event within 45 days after
           the end of each quarterly fiscal period  a certificate (the
           "Compliance Certificate") substantially in the form of Exhibit F
                                                                  ---------
           hereto, executed by the chief financial officer of the Company,
           showing (in reasonable detail and with appropriate calculations and
           computations in all respects satisfactory to the Bank) compliance
           with the financial covenants set forth in Sections 7.2.1, 7.2.2,
                                                     --------------  -----
           7.2.3 and 7.2.4 and stating that no Default has occurred and is
           -----     -----
           continuing or, if there is any such Default, a statement setting
           forth details of such Default and the action which the Company has
           taken and proposes to take with respect thereto;

                (d)  as soon as possible, and in any event within ten (10)
           Banking Days after the Company learns of the following, give written
           notice to the Bank of (a) any material proceeding(s) being instituted
           or threatened to be instituted by or against the Company or any
           Subsidiary in any federal, state, local, or foreign court or before
           any commission or other regulatory body (federal, state, local or
           foreign), (b) any material adverse change in the business, Property
           or condition, financial or otherwise of the Company, and (c) the
           occurrence of any Default;

                (e)  promptly after the sending or filing thereof, copies of all
           reports which the Company sends to its equity securityholders, and
           all reports and registration statements (other than S-8 registration
           statements) which the Company or any of its Subsidiaries files with
           the Securities and Exchange Commission or any national securities
           exchange;

                (f)  promptly after becoming aware of the institution of any
           steps by the Company, the PBGC or any ERISA Affiliate to terminate
           any Pension Plan, or the failure

                                     -93-

 
           to make a required contribution to any Pension Plan if such failure
           is sufficient to give rise to a Lien under section 302(f) of ERISA,
           or the taking of any action with respect to a Pension Plan which
           could result in the requirement that the Company furnish a bond or
           other security to the PBGC or such Pension Plan, or the occurrence of
           any event with respect to any Pension Plan which could result in the
           incurrence by the Company of any material liability, fine or penalty,
           or any material increase in the contingent liability of the Company
           with respect to any post-retirement Welfare Plan benefit, notice
           thereof and copies of all documentation relating thereto;

                (g)  such other information respecting the condition or
           operations, financial or otherwise, of the Company or any of its
           Subsidiaries, or the Company's compliance with this Agreement, as the
           Bank may from time to time reasonably request.

           SECTION 7.1.2.  Compliance with Laws, etc.  The Company will, and
                           -------------------------                        
      will cause each of its Subsidiaries to, comply in all material respects
      with all applicable laws, rules, regulations and orders.

           SECTION 7.1.3.  Maintenance of Properties.  The Company will, and
                           -------------------------                        
      will cause each Subsidiary to, keep and maintain all of its Properties
      necessary or useful in its business in good condition; provided, however,
                                                             --------  ------- 
      that nothing in the Section shall prevent the Company or any Subsidiary
      from discontinuing the operating and maintenance of any of its properties
      if such discontinuance is, in the  judgment of the Company, desirable in
      the conduct of its business.

           SECTION 7.1.4.  Insurance.  The Company will, and will cause each of
                           ---------                                           
      its Subsidiaries to, maintain or cause to be maintained insurance with
      respect to its properties and business against such casualties and
      contingencies and of such types and in such amounts as is customary in the
      case of similar businesses.

           SECTION 7.1.5.  Books and Records.  The Company will, and will cause
                           -----------------                                   
      each of its Subsidiaries to, keep books and records which accurately
      reflect, in accordance with GAAP, all of its business affairs and
      transactions.  The Company shall, and shall cause each Subsidiary to,
      permit the Bank, by its representatives and agents, to inspect any of the
      Properties, corporate books and financial records of the Company and each
      Subsidiary, to examine and make copies of the books of accounts and other
      financial records of the Company and its Subsidiaries and to discuss the
      affairs, finances and accounts of the Company and its Subsidiaries with,
      and to be advised as to the same by, its officers at such reasonable times
      and reasonable intervals as the Bank may request. The Company shall pay to
      the Bank from time to time upon demand an amount sufficient to compensate
      the Bank for its reasonable fees, charges and expenses in connection with
      each such inspection. All such inspections and audits will be performed by
      experienced personnel and, in the case of employees of the Bank, personnel
      generally knowledgeable about the industry in which the Company operates.

           SECTION 7.1.6.  Environmental Covenant.  The Company will, and will
                           ----------------------                             
      cause each of its Subsidiaries to,

                (a)  use and operate all of its facilities and Properties in
           compliance with all Environmental Laws where the failure to do so
           could have a material adverse affect on the condition, financial or
           otherwise, of the Company or any of its Subsidiaries, use
           commercially reasonable efforts to keep all necessary permits,
           approvals, certificates, licenses and other authorizations related to
           environmental matters in effect and remain in material compliance
           therewith, and handle all hazardous materials in compliance with all
           applicable Environmental Laws; and

                                     -94-

 
                (b)  provide such information and certifications which the Bank
           may reasonably request from time to time to evidence compliance with
           the Section.

           SECTION 7.1.7.  Taxes.  The Company will, and will cause each
                           -----                                        
      Subsidiary to, duly pay and discharge all taxes, rates, assessments, fees
      and governmental charges upon or against the Company or any Subsidiary or
      against its Properties in each case before the same becomes delinquent and
      before penalties accrue thereon unless and to the extent that the same is
      being contested in good faith and by appropriate proceedings and adequate
      reserves, determined in accordance with generally accepted accounting
      principles consistently applied, have been established with respect
      thereto.

           SECTION 7.1.8.  Supplemental Performance.  The Company will, and will
                           ------------------------                             
      cause each Subsidiary to, at any time and from time to time upon request
      of the Bank take or cause to be taken any action or execute, acknowledge,
      deliver or record any further documents or other instruments which the
      Bank in its reasonable discretion deems necessary to carry out the
      purposes of the Loan Documents.

           SECTION 7.1.9.  Seasonal Clean-up.  The Company will reduce amounts
                           -----------------                                  
      owed under any credit facility used to finance seasonal working
      requirements to a maximum of $5 million for a period of 30 consecutive
      days during each fiscal year.  Because the Company may maintain more than
      one credit facility to finance its worldwide business operations, the
      seasonal clean-up for each facility may occur during different 30-day
      periods.

      SECTION 7.2.  Negative Covenants.  The Company agrees with the Bank that,
                    ------------------                                         
until all Commitments have terminated and all Obligations have been paid and
performed in full, the Company will perform the obligations set forth in this
Section 7.2.
- ----------- 

           SECTION 7.2.1.  Consolidated Tangible Net Worth.  The Company will
                           -------------------------------                   
      maintain consolidated tangible net worth in an amount not less than
      $130,000,000 as measured at the end of each fiscal quarter during its 1997
      fiscal year; an amount not less than $140,000,000 as measured at the end
      of each fiscal quarter during its 1998 fiscal year and an amount not less
      than $150,000,000 as measured at the end of each fiscal quarter during its
      1999 fiscal year and at the end of each fiscal quarter of each fiscal year
      thereafter.

           SECTION 7.2.2.  Consolidated Total Liabilities to Consolidated
                           ----------------------------------------------
      Tangible Net Worth.  The Company will not permit the ratio of its
      ------------------                                               
      consolidated total liabilities to its consolidated tangible net worth to
      exceed 1.0 to 1.0 as measured at the end of each fiscal quarter of each
      fiscal year.

           SECTION 7.2.3.  Consolidated Third-Party Indebtedness.  The Company
                           -------------------------------------              
      will not permit the total of its Consolidated Third-Party Indebtedness to
      exceed $80,000,000 at any time.  As used herein, Consolidated Third-Party
      Indebtedness shall mean indebtedness for borrowed money (including
      capitalized leases and guarantees of such indebtedness and capitalized
      leases) of the Company and any Subsidiary, other than such indebtedness
      (a) of the Company to any Subsidiary, (b) of any Subsidiary to the
      Company, (c) any Subsidiary to any other Subsidiary or (d) of the Company
      to any of its affiliates.

           SECTION 7.2.4.  Minimum Cash Flow Coverage.  The Company will not
                           --------------------------                       
      permit the ratio of (a) its net income from operations and investments
      plus depreciation, amortization and other non-cash charges plus interest
      ----                                                       ----         
      expense and lease expense less dividends divided by (b) its current
                                ----                                     
      portion of long-term debt plus interest expense plus lease expense to be
                                ----                  ----                    
      less than 1.0 to 1.0 as measured at the end of each fiscal quarter of each
      fiscal year on a rolling four-quarter basis commencing at Company's 1997
      fiscal year end.

                                     -95-

 
           SECTION 7.2.5.  Liens.  The Company will not, and will not permit any
                           -----                                                
      of its Subsidiaries to, create, incur, assume or suffer to exist any Lien
      upon any of its property, revenues or assets, whether now owned or
      hereafter acquired, except, without duplication:

                (a)  Liens outstanding on the Effective Date and listed in
           Schedule 7.2.5 or disclosed in the financial statements referred to
           --------------                                                     
           in Section 6.5;
              ----------- 

                (b)  any renewal or extension of any Lien permitted by this
           Section with extension, refunding or refinancing of the indebtedness
           secured thereby made without increase in the then outstanding
           principal amount thereof and as long as immediately before and after
           any such extension, refunding or refinancing of indebtedness no
           Default exists which is continuing.

                (c)  Liens for taxes, assessments or other governmental charges
           or levies not at the time delinquent or thereafter payable without
           penalty or being diligently contested in good faith by appropriate
           proceedings and for which adequate reserves in accordance with GAAP
           shall have been set aside on its books;

                (d)  Liens of carriers, warehousemen, mechanics, materialmen and
           landlords incurred in the ordinary course of business for sums not
           overdue for a period of more than 30 days or being diligently
           contested in good faith by appropriate proceedings and for which
           adequate reserves in accordance with GAAP shall have been set aside
           on its books;

                (e)  Liens incurred in the ordinary course of business in
           connection with workmen's compensation, unemployment insurance or
           other forms of governmental insurance or benefits, or to secure
           performance of tenders, statutory obligations, leases and contracts
           (other than for borrowed money) entered into in the ordinary course
           of business or to secure obligations on surety or appeal bonds;

                (f)  in addition to Liens permitted by clauses (a) through (e)
                                                       ------- ---         ---
           above, Liens securing indebtedness, capitalized lease obligations or
           other liabilities not exceeding $5,000,000 in the aggregate at any
           time outstanding.

           SECTION 7.2.6. Change in Character of Business.  The Company will
                          -------------------------------                   
      not, and will not permit any Subsidiary to, engage in any business if, as
      a result, there may occur a material adverse change or effect upon the
      Company's or such Subsidiary's financial condition or its ability to honor
      its financial obligations.


                                 ARTICLE VIII

                               EVENTS OF DEFAULT


      SECTION 8.1.  Listing of Events of Default.  Each of the following events
                    ----------------------------                               
or occurrences described in this Section 8.1 shall constitute an "Event of
                                 -----------                      --------
Default".
- -------  

           SECTION 8.1.1.  Non-Payment of Obligations.  The Company shall
                           --------------------------                    
      default in the payment or prepayment when due of any principal on any
      Loan, or the Company shall default (and such default shall continue
      unremedied for a period of five (5) Banking Days) in the payment when due
      of any fee, any interest or of any other Obligation.

           SECTION 8.1.2.  Breach of Warranty.  Any representation or warranty
                           ------------------                                 
      of the Company made or deemed to be made hereunder or in any other Loan
      Document executed by it or any other writing or certificate furnished by
      the Company, to the Bank for the purposes of or in connection

                                     -96-

 
      with this Agreement or any such other Loan Document is or shall be
      incorrect when made or deemed made in any material respect.

           SECTION 8.1.3.  Non-Performance of Covenants and Obligations.  The
                           --------------------------------------------      
      Company shall default in the due performance and observance of any other
      agreement contained herein (other than referred to in Section 8.1.1 or
                                                            -------------   
      8.1.2) or in any other Loan Document executed by it, and such default
      -----                                                                
      shall continue unremedied for a period of 30 days after the earlier of (i)
      the day on which the Company first obtains actual knowledge of such
      default, or (ii) notice thereof shall have been given to the Company by
      the Bank; provided, however, that the Bank shall not take any action
                --------  -------                                         
      permitted hereunder pursuant to Section 8.3 if (x) such default is of a
                                      -----------                            
      nature which is curable by the Company, (y) the Company is diligently
      proceeding to cure such default and (z) such default is so cured within
      ninety (90) days of the occurrence thereof.

           SECTION 8.1.4.  Default on Third-Party Indebtedness.  (a) A default
                           -----------------------------------                
      shall occur in the payment when due (subject to any applicable grace
      period), whether by acceleration or otherwise, of any Third-Party
      Indebtedness (as such term is defined in Section 7.2.3) (other than
                                               -------------             
      indebtedness evidenced by this Agreement and the Notes) of, or guaranteed
      by, the Company or any of its Subsidiaries having a principal amount,
      individually or in the aggregate, in excess of $1,000,000; or (b) a
      default shall occur in the performance or observance of any obligation or
      condition with respect to Third-Party Indebtedness of, or guaranteed by,
      the Company or any of its Subsidiaries having a principal amount,
      individually or in the aggregate, in excess of $1,000,000, if the effect
      of such default is to accelerate the maturity of such Third-Party
      Indebtedness or such default shall continue unremedied for any applicable
      period of time sufficient to permit the holder or holders of such Third-
      Party Indebtedness, or any trustee or agent for such holders, to cause
      such Third-Party Indebtedness to become due and payable prior to its
      expressed maturity.

           SECTION 8.1.5.  Judgments.  Any judgments or orders for the payment
                           ---------                                          
      of money aggregating in excess of $5,000,000 (exclusive of any amount
      covered by insurance) shall be rendered against the Company or any of its
      Subsidiaries or against any property or assets of either and either

                (a)  enforcement proceedings shall have been commenced by any
           creditor upon such judgments or orders; or

                (b)  there shall be any period of 60 consecutive days during
           which a stay of enforcement of such judgment or order, by reason of a
           pending appeal or otherwise, shall not be in effect.

           SECTION 8.1.6. Bankruptcy, Insolvency, etc.  The Company or any of
                          ---------------------------                        
      its Subsidiaries shall

                (a)  become insolvent or generally fail to pay, or admit in
           writing its inability or unwillingness to pay, debts as they become
           due;

                (b)  apply for, consent to, or acquiesce in, the appointment of
           a trustee, receiver, sequestrator or other custodian for the Company
           or any of its Subsidiaries or any property of any thereof, or make a
           general assignment for the benefit of creditors;

                (c)  in the absence of such application, consent or
           acquiescence, permit or suffer to exist the appointment of a trustee,
           receiver, sequestrator or other custodian for the Company or any of
           its Subsidiaries or for a substantial part of the property of any
           thereof, and such trustee, receiver, sequestrator or other custodian
           shall not be discharged within 60 days;

                                     -97-

 
                (d)  permit or suffer to exist the commencement of any
           bankruptcy, reorganization, debt arrangement or other case or
           proceeding under any bankruptcy or insolvency law, or any
           dissolution, winding up or liquidation proceeding, in respect of the
           Company or any of its Subsidiaries, and, if any such case or
           proceeding is not commenced by the Company or such Subsidiary, such
           case or proceeding shall be consented to or acquiesced in by the
           Company or such Subsidiary or shall result in the entry of an order
           for relief or shall remain for 60 days undismissed; or

                (e)  take any action authorizing, or in furtherance of, any of
           the foregoing.

           SECTION 8.1.7.  Other Bank Agreements.  A default shall occur in the
                           ---------------------                               
      payment or performance under any agreement (other than this Agreement and
      the Notes) between the Company and the Bank or any Subsidiary or affiliate
      of the Bank and continuing beyond respective cure periods, if any.

           SECTION 8.1.8.  Change in Ownership.  DowElanco shall cease to own
                           -------------------                               
      for any reason, legally and beneficially, at least 50% of all classes of
      the issued and outstanding capital stock of the Company.

      SECTION 8.2.  Action if Bankruptcy.  If any Event of Default described in
                    --------------------                                       
clauses (a) through (d) of Section 8.1.6 shall occur with respect to the Company
- -----------         ---    -------------                                        
or any Subsidiary, the Commitments (if not theretofore terminated) shall
automatically terminate and the outstanding principal amount of all outstanding
Loans and all other Obligations shall automatically be and become immediately
due and payable, without notice or demand.

      SECTION 8.3.  Action if Other Event of Default.  If any  Event of Default
                    --------------------------------                           
(other than any Event of Default described in clauses (a) through (d) of Section
                                              -----------         ---    -------
8.1.6) with respect to the Company or any Subsidiary) shall occur for any
- -----                                                                    
reason, whether voluntary or involuntary, the Bank may by notice to the Company
declare the outstanding principal amount of the Loans and other Obligations to
be due and payable and/or the Commitments (if not theretofore terminated) to be
terminated, whereupon the full unpaid amount of such Loans and other Obligations
shall be and become immediately due and payable, without further notice, demand
or presentment, and/or, as the case may be, the Commitments shall terminate.


                                  ARTICLE IX

                           MISCELLANEOUS PROVISIONS


      SECTION 9.1.  Waivers, Amendments, etc.  The provisions of this  Agreement
                    ------------------------                                    
and of each other Loan Document may from time to time be amended, modified or
waived, if such amendment, modification or waiver is in writing and consented to
by the Company and the Bank.  No failure or delay on the part of the Bank, or
the holder of any Note in exercising any power or right under this Agreement or
any other Loan Document shall operate as a waiver thereof, nor shall any single
or partial exercise of any such power or right preclude any other or further
exercise thereof or the exercise of any other power or right.  No notice to or
demand on the Company in any case shall entitle it to any notice or demand in
similar or other circumstances.  No waiver or approval by the Bank, or the
holder of any Note under this Agreement or any other Loan Document shall, except
as may be otherwise stated in such waiver or approval, be applicable to
subsequent transactions.  No waiver or approval hereunder shall require any
similar or dissimilar waiver or approval thereafter to be granted hereunder.

      SECTION 9.2.  Notices.  All notices and other communications provided to
                    -------                                                   
any party hereto under this Agreement or any other Loan Document shall be in
writing and addressed, delivered or transmitted to such party at its address or
facsimile number set forth below its signature hereto or at such other address
or facsimile number as may be designated by such party in a notice to the other
party.  Any notice, if mailed and

                                     -98-

 
properly addressed with postage prepaid or if properly addressed and sent by
pre-paid courier service, shall be deemed given when sent; provided, however,
                                                           --------  -------
that notices to the Bank under Sections 2.3 through 2.9 shall not be effective
                               ------------         ---
until actually received by the Bank; any notice, if transmitted by facsimile,
shall be deemed given when transmitted.

      SECTION 9.3.  Payment of Costs and Expenses.  The Company agrees to pay on
                    -----------------------------                               
demand all reasonable expenses of the Bank (including the fees and out-of-pocket
expenses of counsel to the Bank) in connection with (a) the negotiation,
preparation, execution and delivery of this Agreement and of each other Loan
Document, including schedules and exhibits, and (b) any amendments, waivers,
consents, supplements or other modifications to this Agreement or any other Loan
Document as may from time to time hereafter be required, whether or not the
transactions contemplated hereby are consummated; provided, however, that such
                                                  --------  -------           
expenses and fees for the matters referred to in clause (a) hereof shall not
                                                 ----------                 
exceed $10,000.

The Company further agrees to pay, and to save the Bank harmless from all
liability for, any stamp or other taxes which may be payable in connection with
the execution or delivery of this Agreement, the borrowings hereunder, or the
issuance of the Notes or any other Loan Documents or the acceptance of
telephonic or other instructions for making Loans.  The Company also agrees to
reimburse the Bank upon demand its reasonable expenses, including fees and out-
of-pocket expenses of counsel (including counsel who may be employees of the
Bank), incurred by the Bank in connection with (x) the negotiation of any
restructuring or "work-out", whether or not consummated, of any Obligations and
(y) the enforcement of any Obligations.

      SECTION 9.4.  Indemnification.  In consideration of the execution and
                    ---------------                                        
delivery of this Agreement by the Bank and the extension of the Commitments, the
Company hereby indemnifies, exonerates and holds the Bank and its respective
officers, directors, employees and agents (collectively, the "Indemnified
Parties") free and harmless from and against any and all actions, causes of
action, suits, losses, costs, liabilities and damages, and expenses incurred in
connection therewith (irrespective of whether any such Indemnified Party is a
party to the action for which indemnification hereunder is sought), including
reasonable attorneys' fees and disbursements (collectively, the "Indemnified
Liabilities"), incurred by the Indemnified Parties or any of them as a result
of, or arising out of, or relating to (a) any transaction financed or to be
financed in whole or in part, directly or indirectly, with the proceeds of any
Loan; or (b) the entering into and performance of this Agreement and any other
Loan Document by any of the Indemnified Parties, except for any such Indemnified
Liabilities arising for the account of a particular Indemnified Party by reason
of the relevant Indemnified Party's gross negligence or wilful misconduct. If
and to the extent that the foregoing undertaking may be unenforceable for any
reason, the Company hereby agrees to make the maximum contribution to the
payment and satisfaction of each of the Indemnified Liabilities which is
permissible under applicable law.

      SECTION 9.5.  Survival.  The obligations of the Company under Sections
                    --------                                        --------
4.3, 4.4, 4.5, 4.6, 9.3 and 9.4 shall in each case survive any termination of
- ---  ---  ---  ---  ---     ---                                              
this Agreement, the payment in full of all Obligations and the termination of
all Commitments.  The representations and warranties made by the Company in this
Agreement and in each other Loan Document shall survive the execution and
delivery of this Agreement and each such other Loan Document.

      SECTION 9.6.  Severability.  Any provision of this Agreement or any other
                    ------------                                               
Loan Document which is prohibited or unenforceable in any jurisdiction shall, as
to such provision and such jurisdiction, be ineffective to the extent of such
prohibition or unenforceability without invalidating the remaining provisions of
this Agreement or such Loan Document or affecting the validity or enforceability
of such provision in any other jurisdiction.

      SECTION 9.7.  Headings.  The various headings of this Agreement and of
                    --------                                                
each other Loan Document are inserted for convenience only and shall not affect
the meaning or interpretation of this Agreement or such other Loan Document or
any provisions hereof or thereof.

      SECTION 9.8.  Execution in Counterparts, Effectiveness, etc.  This
                    ---------------------------------------------       
Agreement may be executed by the parties hereto in several counterparts, each of
which shall be executed by the Company and the Bank

                                     -99-

 
and be deemed to be an original and all of which shall constitute together but
one and the same agreement. This Agreement shall become effective when
counterpart hereof executed on behalf of the Company shall have been received by
the Bank.

      SECTION 9.9.  Governing Law; Entire Agreement.  This Agreement, the Notes
                    -------------------------------                            
and each other Loan Document shall each be deemed to be a contract made under
and governed by the internal laws of the State of Illinois.  This Agreement, the
Notes and the other Loan Documents constitute the entire understanding among the
parties hereto with respect to the subject matter hereof and supersede any prior
agreements, written or oral, with respect thereto.

      SECTION 9.10.  Successors and Assigns.  This Agreement shall be binding
                     ----------------------                                  
upon and shall inure to the benefit of the parties hereto and their respective
successors and assigns; provided, however, that the Company may not assign or
                        --------  -------                                    
transfer its rights or obligations hereunder without the prior written consent
of the Bank.

      SECTION 9.11.  Forum Selection and Consent to Jurisdiction.  ANY
                     -------------------------------------------      
LITIGATION BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS
AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY COURSE OF CONDUCT, COURSE OF
DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF THE BANK, OR THE
COMPANY SHALL BE BROUGHT AND MAINTAINED EXCLUSIVELY IN THE COURTS OF THE STATE
OF ILLINOIS OR IN THE UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT OF
ILLINOIS.  THE COMPANY HEREBY EXPRESSLY AND IRREVOCABLY SUBMITS TO THE
JURISDICTION OF THE COURTS OF THE STATE OF ILLINOIS AND OF THE UNITED STATES
DISTRICT COURT FOR THE NORTHERN DISTRICT OF ILLINOIS FOR THE PURPOSE OF ANY SUCH
LITIGATION AS SET FORTH ABOVE AND IRREVOCABLY AGREES TO BE BOUND BY ANY JUDGMENT
RENDERED THEREBY IN CONNECTION WITH SUCH LITIGATION.  THE COMPANY FURTHER
IRREVOCABLY CONSENTS TO THE SERVICE OF PROCESS BY REGISTERED MAIL, POSTAGE
PREPAID, OR BY PERSONAL SERVICE WITHIN OR WITHOUT THE STATE OF ILLINOIS.  THE
COMPANY HEREBY EXPRESSLY AND IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED
BY LAW, ANY OBJECTION WHICH IT MAY HAVE OR HEREAFTER MAY HAVE TO THE LAYING OF
VENUE OF ANY SUCH LITIGATION BROUGHT IN ANY SUCH COURT REFERRED TO ABOVE AND ANY
CLAIM THAT ANY SUCH LITIGATION HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.  TO
THE EXTENT THAT THE COMPANY HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY FROM
JURISDICTION OF ANY COURT OF FROM ANY LEGAL PROCESS (WHETHER THROUGH SERVICE OR
NOTICE, ATTACHMENT PRIOR TO JUDGMENT, ATTACHMENT IN AID OF EXECUTION OR
OTHERWISE) WITH RESPECT TO ITSELF OR ITS PROPERTY, THE COMPANY HEREBY
IRREVOCABLY WAIVES SUCH IMMUNITY IN RESPECT OF ITS OBLIGATIONS UNDER THIS
AGREEMENT AND THE OTHER LOAN DOCUMENTS.

      SECTION 9.12.  Waiver of Jury Trial.  THE BANK AND THE COMPANY HEREBY
                     --------------------                                  
KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHTS THEY MAY HAVE TO A
TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT OF,
UNDER, OR IN CONNECTION WITH, THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY
COURSE OF CONDUCT, COURSE OF DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR
ACTIONS OF THE BANK OR THE COMPANY.  THE COMPANY ACKNOWLEDGES AND AGREES THAT IT
HAS RECEIVED FULL AND SUFFICIENT CONSIDERATION FOR THIS PROVISION (AND EACH
OTHER PROVISION OF EACH OTHER LOAN DOCUMENT TO WHICH IT IS A PARTY) AND THAT
THIS PROVISION IS A MATERIAL INDUCEMENT FOR THE BANK ENTERING INTO THIS
AGREEMENT AND EACH SUCH OTHER LOAN DOCUMENT.

                          [intentionally left blank]

                                     -100-

 
      IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.


                              MYCOGEN CORPORATION


                              By:   /s/ Carlton J. Eibl
                                    ----------------------------
                               Title:   President & COO
                                        ------------------------

                              Address:  5501 Oberlin Drive
                                               San Diego, California
                                                         92121
                              Facsimile No.:

                              Attention:  Mr. James A. Baumker
                                               Vice President and
                                               Chief Financial Officer


                              BANK OF AMERICA ILLINOIS


                              By:   /s/ John W. Weubbe
                                    ----------------------------
                               Title:   Vice President
                                        ------------------------

                              Address:  231 South LaSalle Street
                                               Chicago, Illinois  60697

                              Facsimile No.:  312-828-1974

                              Attention:  Mr. John W. Weubbe
                                               Vice President

                              Address of Bank's Domestic Lending Office,
                              Interbank Lending Office and LIBOR Lending Office:

                                               231 South LaSalle Street
                                               Chicago, Illinois  60697

                                     -101-

 
                                 Exhibits and Schedules
                                 ----------------------


Exhibit A -     Borrowing Request

Exhibit B -     Continuation/Conversion Notice

Exhibit C -     Revolving Note

Exhibit D -     Term Note

Exhibit E -     Compliance Certificate

Exhibit F -     Opinion of Counsel

Schedule 6.7 -  Litigation, Labor Controversies, etc.

Schedule 6.8 -  Subsidiaries

Schedule 6.9 -  Partnerships and Joint Ventures

Schedule 6.13 - Pension and Welfare Plans

Schedule 6.14 - Environmental Warranties

Schedule 7.2.5- Liens

                                     -102-

 
                                 Schedule 6.7



                   [Litigation, Labor Controversies, etc. -

                        to be completed by the Company]

                            Mycogen v. Ecogen, Inc.
                       Federal District Court, San Diego
                              (Filed January 1997)


                Mycogen Plant Science, Inc. v. Monsanto Company
                       Federal District Court, San Diego
                              (Filed May 19, 1995)


                      Plant Genetic Systems NV v. Mycogen
                    Central District Court of North Carolina
                            (Filed October 31, 1995)
                           (Amended August 13, 1996)


                          Monsanto Company v. Mycogen
                  Federal District Court, Wilmington, Delaware
                             (Filed March 19, 1996)


                    Mycogen Plant Science, Inc. v. Monsanto
             California Court of Appeal, Fourth Appellate District
              (Reversal of San Diego County Superior Court ruling
                        in a Case filed December, 1993)


                              Mycogen v. Monsanto
                     Superior Court, San Diego, California
                              (Filed May 8, 1996)


                               DeKalb v. Mycogen
                  Federal District Court in Rockford, Illinois
                             (Filed April 30, 1996)

                                     -103-

 
                                 Schedule 6.7
                                  Page 2 of 2



                               DeKalb v. Mycogen
                  Federal District Court, Rockford, Illinois)
                             (Filed July 23, 1996)
                           (Amended August 27, 1996)


                    Mycogen Plant Science, Inc. v. Monsanto
                  Federal District Court, Wilmington, Delaware
     to reverse a ruling of the Board of Patent Appeals and Interferences
                            (Filed August 15, 1996)


                Mycogen v. Monsanto, DeKalb, Delta and Pineland
                  Federal District Court, Wilmington, Delaware
                            (Filed October 22, 1996)


                                     -104-

 
                                  Schedule 6.8

                                  Subsidiaries



        MYCOGEN CORPORATION (A CALIFORNIA CORPORATION) SUBSIDIARIES 1997

SEEDS

Myocgen Plant Science, Inc. (a Delaware corporation)
Agrigenetics, Inc., d/b/a Mycogen Seeds (a Delaware corporation)
 United Agriseeds (a Delaware corporation)
 Mycogen de Argentina, S.A. - Argentina
 Agrigenetics, S.A. de C.V. - Argentina
 Mycogen Plant Sciences - Puerto Rico
 Mycogen Canada, Inc. - Canada
 Santa Ursula S.A.A.I.C. e I. - Argentina
 Corporacion de Inversiones Frutihorticolas, S.A.

BIOPESTICIDES

Mycogen Crop Protection, Inc. (a California corporation)
 Soilserv, Inc. (a California corporation)
 Parasitix Corporation (a California corporation)
 Mycosub/BH, Inc. (a Delaware corporation)
 Mycosub/BA, Inc. (a Delaware corporation)
 Mycogen S.A. de C.V. - Mexico
 Mycogen Far East Asia Corporation (a California corporation)
 
                                     -105-

 
                                 Schedule 6.9

                        Partnerships and Joint Ventures



                       MJTBH/BT Partnership, L.P. between
                   Mycosub/BH, Inc. and J T Biotech USA, Inc.
                                (March 6, 1989)



                        MJTBA Partnership, L.P. between
                   Mycosub/BA, Inc. and J T Biotech USA, Inc.
                                (March 6, 1989)



                           Agrigenetics, L.P. between
                    Mycogen and Mycogen Plant Science, Inc.
                         (August 25, 1992, as amended)

                                     -106-

 
                                 Schedule 6.13

                           Pension and Welfare Plans



                         Soilserv, Inc.'s Pension Plan

                                     -107-

 
                                 Schedule 6.14

                            Environmental Warranties



                                      None

                                     -108-

 
                                 Schedule 7.2.5

                                     Liens

                                      None

                                     -109-

 
                                   EXHIBIT A


                               BORROWING REQUEST


Bank of America Illinois
231 South LaSalle Street
Chicago, Illinois  60697

Attention:  John W. Weubbe, Vice President

                              MYCOGEN CORPORATION
                              -------------------

Ladies and Gentlemen:

      This Borrowing Request is delivered to you pursuant to Section 5.2.2 of
                                                             -------------   
the Credit Agreement, dated as of ____________, 1997 (together with all
amendments, if any, from time to time made thereto, the "Credit Agreement"),
between Mycogen Corporation, a California corporation (the "Company") and Bank
of America Illinois (the "Bank").  Unless otherwise defined herein or the
context otherwise requires, terms used herein have the meanings provided in the
Credit Agreement.

                   [complete the following, as appropriate]

      The Company hereby requests that the Term Loan be made on ______________
in the principal amount of $________________.  Such Term Loan shall be made as a
[Eurodollar Rate Loan having an Interest Period of _________________] [Quoted
Rate Loan having an Interest Period of _________] [Reference Rate Loan].

      The Company hereby requests that a Revolving Loan be made on ____________
in the principal amount of $______________.  Such Revolving Loan shall be made
as a [Eurodollar Rate Loan having an Interest Period of ________] [a
Eurocurrency Rate Loan in ___________ Eurocurrency and having an Interest Period
of ____] [Quoted Rate Loan having an Interest Period of _____] [Reference Rate
Loan].

      The Company hereby acknowledges that the delivery of this Borrowing
Request and the acceptance by the Company of the proceeds of the Loans requested
hereby constitutes a representation and warranty by the Company that, on the
date of such Loans, and before and after giving effect thereto and to the
application of the proceeds therefrom, all statements set forth in each of the
subsections of Section 5.2.1 are true and correct in all material respects.
               -------------                                               

                                     -110-

 
  The Company has caused this Borrowing Request to be executed and delivered,
and the certification and warranties contained herein to be made, by its duly
Authorized Official this ____ day of ____________, 1997.

                                MYCOGEN CORPORATION



                                By:___________________________________________
                                  Name:
                                  Title:

                                     -111-

 
                                 EXHIBIT  B


                       NOTICE OF CONTINUATION/CONVERSION



Bank of America Illinois
231 South LaSalle Street
Chicago, Illinois  60697

Attention:  John W. Weubbe, Vice President


                              MYCOGEN CORPORATION
                              -------------------


Ladies and Gentlemen:

  This Continuation/Conversion Notice is delivered to you pursuant to Section
                                                                      -------
2.9 of the Credit Agreement, dated as of _____________, 1997 (together with all
- ---                                                                            
amendments, if any, from time to time made thereto, the "Credit Agreement"),
between Mycogen Corporation, a California corporation (the "Company"), and Bank
of America Illinois (the "Bank").  Unless otherwise defined herein or the
context otherwise requires, terms used herein have the meanings provided in the
Credit Agreement.

  The Company hereby requests that on ____________, 19___,

                    [complete the following, as applicable]

       (1) $___________ of the presently outstanding principal amount of the
   [Term Loans] [Revolving Loans] originally made on __________, 19___ [and
   $__________ of the presently outstanding principal amount of the [Term Loans]
   [Revolving Loans] originally made on __________, 19___],

       (2)  and all presently being maintained as [Eurodollar Rate Loans],
   [Eurocurrency Rate Loans] [Quoted Rate Loans] [Reference Rate Loans]

       (3)  be [converted into] [continued as],

       (4)  [Eurodollar Rate Loans having an Interest Period of _________]
   [Eurocurrency Rate Loans in _________ Eurocurrency and having an Interest
   Period of ____________] [Quoted Rate Loans having an Interest Period
   of ___________] [Reference Rate Loans]

   The Borrower hereby certifies and warrants that no Default or Event of
   Default has occurred and is continuing.

                                     -112-

 
  The Borrower has caused this Notice of Continuation/ Conversion to be executed
and delivered, and the certification and warranties contained herein to be made,
by its Authorized Official this ____ day of ____________, 19__.



                              MYCOGEN CORPORATION



                              
                             By:____________________________________________
                                Name:
                                Title:


                                     -113-

 
                                   EXHIBIT C

                           REVOLVING PROMISSORY NOTE



$10,000,000.00                                            Due: February  1, 1998
                                            Chicago, Illinois: February 11, 1997
                                                               -----------


  FOR VALUE RECEIVED, the undersigned, MYCOGEN CORPORATION, a California
corporation (the "Company"), promises to pay to the order of BANK OF AMERICA
ILLINOIS, an Illinois banking corporation (the "Bank"), on February 1, 1998, or
such earlier date as set forth in the Credit Agreement hereinafter referred to,
the principal sum of Ten Million and No/100 Dollars ($10,000,000), or if less,
the then aggregate unpaid principal amount of Revolving Loans (as such term is
defined in the Credit Agreement) as may be borrowed by the Company under the
Credit Agreement.  The Company may borrow, repay and reborrow hereunder in
accordance with the provisions of the Credit Agreement.  All Revolving Loans and
all payments of principal shall be recorded by the holder in its records or, at
its option, on the schedule (or any continuation thereof) attached to this Note.

  The Company further promises to pay to the order of the Bank interest on the
aggregate unpaid principal amount hereof from time to time outstanding from the
date hereof until paid in full at the rates per annum and times determined in
accordance with the provisions of the Credit Agreement.

  All payments of principal and interest under this Note shall be made in lawful
money of the United States of America in immediately available funds at the
Bank's office at 231 South LaSalle Street, Chicago, Illinois 60697, or at such
other place as may be designated by the Bank to the Company in writing.

  This Note is the Revolving Note referred to in, and evidences indebtedness
incurred under, a Credit Agreement dated as of February 11, 1997 (herein, as it
may be amended, modified or supplemented from time to time, called the "Credit
Agreement") between the Company and the Bank, to which Credit Agreement
reference is made for a statement of the terms and provisions thereof, including
those under which the Company is permitted and required to make prepayment and
repayments of principal of such indebtedness and under which such indebtedness
may be declared to be immediately due and payable.

  All parties hereto, whether as makers, endorsers or otherwise, severally waive
presentment, demand, protest and notice of dishonor in connection with this
Note.

  This Note is made under and governed by the internal laws of the State of
Illinois.


                                     -114-

 
  THE COMPANY AND THE BANK WAIVE ANY RIGHT TO A TRIAL BY JURY IN ANY ACTION OR
PROCEEDING TO ENFORCE OR DEFEND ANY RIGHTS (I) UNDER THIS PROMISSORY NOTE OR
UNDER ANY AMENDMENT, INSTRUMENT, DOCUMENT OR AGREEMENT EXECUTED AND DELIVERED IN
CONNECTION HEREWITH OR (II) ARISING FROM ANY BANKING RELATIONSHIP EXISTING IN
CONNECTION WITH THIS PROMISSORY NOTE, AND AGREE THAT SUCH ACTION OR PROCEEDING
SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY.

                                    MYCOGEN CORPORATION



                                    By:   /s/ Carlton J. Eibl
                                         ------------------------------------
                                    Title:  President & COO
                                           ----------------------------------

                                     -115-

 
  Schedule attached to Revolving Note dated  February 11, 1997 of Mycogen
                                            ------------                 
Corporation, payable to the order of Bank of America Illinois.



                                   Type of    
                   Amount          Loan &          Interest
                     of          Applicable         Period         Amount of        Unpaid
                    Loan          Interest            (if          Principal       Principal       Notation
Date                Made            Rate          applicable)        Repaid         Balance         Made By
- -------------   -------------   -------------   ---------------   ------------   -------------   -------------
                                                                                
 
 -------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

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

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

The aggregate unpaid principal amount shown on this Schedule shall be rebuttable
presumptive evidence of the principal amount owing and unpaid on this Note.  The
failure to record the date and amount of any Revolving Loan on this Schedule
shall not, however, limit or otherwise affect the Company's obligations under
the Credit Agreement or this Note to repay the principal amount of the Revolving
Loans together with all interest accruing thereon.

                                     -116-

 
                                   EXHIBIT D

                             TERM PROMISSORY NOTE



$15,000,000.00                                             Due: February 1, 2002
                                            Chicago, Illinois: February 11, 1997
                                                               -----------      


  On or before February 1, 2002 the undersigned, MYCOGEN CORPORATION, a
California corporation (the "Company"), for value received, hereby promises to
pay to the order of BANK OF AMERICA ILLINOIS, an Illinois banking corporation
(the "Bank"), at its office at 231 South LaSalle Street, Chicago, Illinois
60697, the principal sum of Fifteen Million and No/100 Dollars ($15,000,000), or
if, less, the principal sum of the Term Loan made by the Bank to the Company
pursuant to the Credit Agreement referred to below, which principal sum shall be
payable in twenty (20) equal quarterly installments of $750,000 (other than the
last such installment, which shall be in such amount so as to pay in full the
entire principal amount of the Term Loan then outstanding) on each Quarterly
Payment Date as set forth in Section 3.1 of the Credit Agreement.
                             -----------                         

  The Company further promises to pay to the order of the Bank interest on the
principal sum hereof from time to time outstanding from the date hereof until
paid in full at the rates per annum and times determined in accordance with the
provisions of the Credit Agreement.

  All payments of principal and interest under this Note shall be made in lawful
money of the United States of America in immediately available funds at the
Bank's office at 231 South LaSalle Street, Chicago, Illinois 60697, or at such
other place as may be designated by the Bank to the Company in writing.

  This Note is the Term Note referred to in, and evidences indebtedness incurred
under, a Credit Agreement dated as of February 11, 1997 (herein, as it may be
amended, modified or supplemented from time to time, called the "Credit
Agreement") between the Company and the Bank, to which Credit Agreement
reference is made for a statement of the terms and provisions thereof, including
those under which the Company is permitted and required to make prepayments and
repayments of principal of such indebtedness and under which such indebtedness
may be declared to be immediately due and payable.

  All parties hereto, whether as makers, endorsers or otherwise, severally waive
presentment, demand, protest and notice of dishonor in connection with this
Note.

  This Note is made under and governed by the internal laws of the State of
Illinois.

  THE COMPANY AND THE BANK WAIVE ANY RIGHT TO A TRIAL BY JURY IN ANY ACTION OR
PROCEEDING TO ENFORCE OR DEFEND ANY RIGHTS (I) UNDER THIS PROMISSORY NOTE OR
UNDER ANY AMENDMENT, INSTRUMENT, DOCUMENT OR AGREEMENT EXECUTED AND DELIVERED IN
CONNECTION HEREWITH OR (II) ARISING FROM ANY BANKING RELATIONSHIP EXISTING IN
CONNECTION WITH THIS PROMISSORY NOTE, AND AGREE THAT SUCH ACTION OR PROCEEDING
SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY.

                                    MYCOGEN CORPORATION


                                    By:   /s/ Carlton J. Eibl.
                                         --------------------------------------
                                    Title:   President & COO
                                            -----------------------------------


                                     -117-

 
  Schedule attached to Term Promissory Note dated as of  February 11, 1997
                                                        ------------      
Mycogen Corporation, payable to the order of Bank of America Illinois.



                                   Type of
                                   Loan &
                   Amount        Applicable        Period         Amount of        Unpaid
                   of Loan        Interest           if           Principal       Principal       Notation
Date                Made            Rate         applicable        Repaid          Balance         Made By
- -------------   -------------   -------------   -------------   -------------   -------------   -------------
                                                                               
- -------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

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

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


The aggregate unpaid principal amount shown on this Schedule shall be rebuttable
presumptive evidence of the principal amount owing and unpaid on this Note.  The
failure to record the date and a amount of any borrowing on this Schedule shall
not, however, limit or otherwise affect the Company's obligations under this
Note to repay the principal amount of the Term Loan together with all interest
accruing thereon.

                                     -118-

 
                                 EXHIBIT E

                            COMPLIANCE CERTIFICATE


  This Compliance Certificate is furnished by MYCOGEN CORPORATION (the
"Company") to BANK OF AMERICA ILLINOIS, pursuant to that certain Credit
Agreement dated as of  February 11, 1997 (the "Credit Agreement").  Unless
                      ------------                                        
otherwise defined herein, the terms used in this Compliance Certificate have the
meanings ascribed thereto in the Credit Agreement.

  THE UNDERSIGNED HEREBY CERTIFIES THAT:

  (1) I am the duly elected  Chief Financial Officer  of the Company;
                            -------------------------                

  2.  I have reviewed the terms of the Credit Agreement and I have made, or have
caused to be made under my supervision, a detailed review of the transactions
and conditions of the Company during the accounting period covered by the
attached financial statements;

  3.  The examinations described in paragraph 2 did not disclose, and I have no
knowledge of, the existence of any condition or the occurrence of any event
which constitutes Event of Default or Unmatured Event of Default during or at
the end of the accounting period covered by the attached financial statements or
as of the date of this Certificate, except as set forth below;

  4.  The financial statements required by Section 7.1 of the Credit Agreement
                                           -----------
and being furnished to you concurrently with this Certificate, to the best of my
knowledge, fairly represent the Company's condition in accordance with GAAP as
of the dates and for the periods covered thereby; and

  5.  The Attachment hereto sets forth financial data and computations
evidencing the Company's compliance with the covenants set for in Sections
                                                                  --------
7.2.1, 7.2.2, 7.2.3 and 7.2.4 of the Credit Agreement, all of which data and
- -----  -----  -----     ----- 
computations are, to the best of my knowledge, true, complete and correct and
have been made in accordance with the relevant Sections of the Credit Agreement.

  Described below are the exceptions, if any, to paragraph 3 by listing, in
detail, the nature of the condition or event, the period during which it has
existed and the action which the Company has taken, is taking, or proposes to
take with respect to each such condition or event:

                                     -119-

 
  The foregoing certifications, together with the computations set forth in the
Attachment hereto and the financial statements delivered with this Certificate
in support hereof, and made and delivered this  11th day of  February 11, 1997.
                                               -----        ------------    -- 


                                         MYCOGEN CORPORATION



                                         By: /s/ James A. Baumker
                                             ---------------------------------

                                         Title: Chief Financial Officer
                                                ------------------------------

                                     -120-

 
                     ATTACHMENT TO COMPLIANCE CERTIFICATE
                              MYCOGEN CORPORATION

                          Compliance Calculations for
                               Credit Agreement
                        Dated as of ____________, 1997

                  Calculations made as of ____________, 199


A.   Consolidated Tangible Net Worth (Section 7.2.1)
     -----------------------------------------------


                    Period                    Required                   Actual
                    ------                    --------                   ------
                                                                 
     1.      1997 Fiscal Year          greater than or equal
                                       to $130,000,000                 $
     2.      1998 Fiscal Year          greater than or equal
                                       to $140,000,000                 $
     3.      1999 Fiscal Year
             (and each fiscal          greater than or equal            
             year thereafter)          to $150,000,000                 $ 
     4.      Covenant measured
             as of the last day
             of each fiscal
             quarter of each
             fiscal year -
             Company in compliance?
             (Circle Yes or No)                                     Yes / No
                                                                    --------
 
B.   Consolidated Total Liabilities to Consolidate Tangible Net Worth (Section
     -------------------------------------------------------------------------
     7.2.2)
     ------



                                                                     
     1.      Consolidated Total Liabilities                            $
     2.      Consolidated Tangible Net Worth                           $
     3.      Ratio of Line 1 to Line 2                                 ______:
     4.      Ratio on Line 3 must not exceed
             1.0 to 1.0 -
             Company in compliance?
             (Circle Yes or No)                                     Yes / No
                                                                    --------

C.   Consolidated Third-Party Indebtedness (Section 7.2.3)
     -----------------------------------------------------
 
 
                                                                    
     1.      Consolidated Third-Party Indebtedness                     $
     2.      Line 1 may not exceed $80,000,000
             at any time -
             Company in compliance?
             (Circle Yes or No)                                     Yes / No
                                                                    --------

D.   Minimum Cash Flow Coverage commencing at Company's 1997 Fiscal Year End 
     -----------------------------------------------------------------------
     (Section 7.2.4)
     ---------------
 
      
                                                                  
     1.      Net income from operations                                $
     2.      Net income from investments                               $
     3.      Depreciation, Amortization and
             other non-cash Charges                                    $
     4.      Interest Expense                                          $
     5.      Lease Expense                                             $
 

                                     -121-

 
 
 
                                                               
     6.      Dividends paid or declared                                $
     7.      Sum of Lines 1 through 5                                  $
     8.      Line 7 minus Line 6                                       $
                    -----
     9.      Current portion of Long-Term debt                         $
     10.     Interest expense (Line 4)                                 $
     11.     Lease Expense (Line 5)                                    $
     12.     Sum of Lines 9, 10 and 11                                 $
     13.     Ratio of Line 8 to Line 12                           _____:
     14.     Ratio on Line 13 must not be
             less than 1.0 to 1.0
             (measured on a rolling, four
             fiscal quarter basis) -
             Company in compliance?
             (Circle Yes or No)                                        Yes / No
                                                                       --------
 

                                     -122-

 
                                   EXHIBIT F


                           Form of Opinion of Counsel


                               February 11, 1997



Bank of America Illinois
231 South LaSalle Street
Chicago, Illinois   60697

Attention:  Mr. John W. Weubbe
            Vice President

     Re:    Credit Agreement dated as of February 11, 1997,
            between Bank of America Illinois and Mycogen Corporation

Ladies and Gentlemen:

     I have acted as counsel for Mycogen Corporation, a California corporation
(the "Company") in connection with the execution and delivery by the Company to
Bank of America Illinois (the "Bank") of that certain (a) Credit Agreement dated
as of February 11, 1997 (the "Credit Agreement") between the Company and the
Bank; (b) Revolving Note dated February 11, 1997, made by the Company payable to
the order of the Bank in the principal amount of $10,000,000 (the "Revolving
Note"); (c) Term Note dated February 11, 1997, made by the Company payable to
the order of the Bank in the principal amount of $15,000,000 (the "Term Note")
(the Credit Agreement, the Revolving Note and the Term Note are referred to
herein as the "Loan Documents").  This opinion is given pursuant to Section
                                                                    -------
5.1.3 of the Credit Agreement.  Capitalized terms not otherwise defined herein
- -----                                                                         
have the meanings ascribed to them in the Loan Documents.

     In rendering this opinion, I have examined the Loan Documents.  I have also
examined originals, or copies certified or otherwise identified to my
satisfaction, of such records, documents, certificates and other instruments and
made such inquiries of the Company as in my judgment are necessary or
appropriate for the purposes of the opinions contained herein.  I have assumed
the genuineness of all signatures, the authenticity of all documents submitted
to me as originals and the conformity to original documents of all documents
submitted to me as certified or photostatic copies.  I have further assumed,
with respect to all documents I have reviewed, the due authorization, execution
and delivery thereof by parties other than the Company.  I have relied as to
factual matters upon certificates or statements of such public officials and
such officers and duly appointed agents of the Company as I have deemed relevant
or necessary.

     Based upon the foregoing, I am of the opinion that:

     1.   The Company is a corporation duly incorporated, validly existing and
in good standing under the laws of the State of California, and has the
corporate power and authority to own, lease and operate its properties and to
carry on its business as now being conducted.

     2.   The Company has the corporate power and authority to enter into the
Loan Documents and to perform its obligations thereunder.

                                     -123-

 
     3.   The Loan Documents have been duly authorized, executed and delivered
by the Company and constitute the valid and binding obligations of the Company,
enforceable against the Company in accordance with their respective terms.

     4.   The execution and delivery of the Loan Documents by the Company and
the performance by the Company of its obligations thereunder do not and will
not, to the best of my knowledge, (i) contravene or conflict with any provision
of any existing law, statute, rule or regulation applicable to the Company, (ii)
contravene or conflict with, result in any breach of, or constitute a default
under, any indenture, mortgage, deed of trust, credit agreement, loan agreement
or other agreement, contract or instrument binding on it, (iii) conflict with or
result in a violation of any order, writ, judgment or decree which the Company
is a party or by which it may be bound, (iv) conflict with or result in a
violation of the Company's certificate of incorporation or by-laws, or (v)
result in the creation or imposition of any lien.

     5.   No order, authorization, consent, license or exemption of, or filing
or registration with, any court or governmental department, agency,
instrumentality or regulatory body is or will be required in connection with
either the execution and delivery by the Company of any Loan Documents, or the
performance by the Company of its obligations thereunder that are required to be
performed on or before the effective dates of the Loan Documents with respect to
the transactions evidenced thereby.

     6.   To my knowledge, except as described in the Loan Documents, there are
no actions, suits or proceedings pending or threatened against or affecting the
Company or the properties of the Company before any court or governmental
department, commission, board, bureau, agency or instrumentality, domestic or
foreign, which, if determined adversely to the Company, would have a material
adverse effect on the financial condition, properties or operations of the
Company.

     7.   The Company is not engaged principally, or in one of its important
activities, in the business of extending credit for the purpose of purchasing or
carrying "margin stock" within the meaning of the Regulations G and U of the
Board of Governors of the Federal Reserve Bank.

     8.   The Company is not an "investment company" within the meaning of the
Investment Company Act of 1940, as amended.

     9.   The Company is not a "holding company," nor a "subsidiary company" of
a "holding company," nor an "affiliate" of a "holding company" or of a
"subsidiary company" of a "holding company" within the meaning of the Public
Utility Holding Company Act of 1935, as amended.

     10.  No taxes or other charges, including without limitation, intangible or
documentary stamp taxes, mortgage or recording taxes, transfer taxes or similar
charges, are payable on account of the execution or delivery of the Loan
Documents or the creation of the indebtedness evidenced or secured by any of the
Loan Documents or the recording or filing of any of the Loan Documents.

                                             Very truly yours,

                                             /s/ Loreen P. Collins
                                             -------------------------------
                                             Loreen P. Collins
                                             Legal Counsel
LPC/cm

                                     -124-