Exhibit Number (1)
                                                           To 3/31/97/ Form 10-Q
 
                                 NTC CAPITAL I
                                NTC CAPITAL II
                                NTC CAPITAL III

                             Preferred Securities
 
                     fully and unconditionally guaranteed
                  to the extent set forth in the Guarantee by

                          NORTHERN TRUST CORPORATION

                            Underwriting Agreement



                                                                  April 22, 1997


Ladies and Gentlemen:

     From time to time, NTC Capital I, NTC Capital II or NTC Capital III, each a
statutory business trust created under the laws of the State of Delaware (each a
"Trust" and collectively, the "Trusts"), and Northern Trust Corporation, a
Delaware corporation (the "Guarantor"), as depositor of each Trust and as
Guarantor, propose to enter into one or more Pricing Agreements (each a "Pricing
Agreement") in the form of Annex I hereto, with such additions and deletions as
the parties thereto may determine, and, subject to the terms and conditions
stated herein and therein, which shall provide that the Trust identified in the
applicable Pricing Agreement (such Trust being the "Designated Trust" with
respect to such Pricing Agreement) shall issue and sell to the firms (such firms
constituting the "Underwriters" with respect to such Pricing Agreement and the
securities specified therein) certain of its preferred securities (the
"Securities") identified in Schedule I to the applicable Pricing Agreement (with
respect to such Pricing Agreement, the "Firm Designated Securities")
representing undivided beneficial interests in the assets of the Designated
Trust, guaranteed by the Guarantor to the extent set forth in the guarantee
agreement (the "Guarantee") identified in such Pricing Agreement. If specified
in such Pricing Agreement, the Designated Trust may grant to the Underwriters
the right 


 
to purchase at their election an additional number of Securities, specified in
such Pricing Agreement as provided in Section 3 hereof (the "Optional Designated
Securities"). The Firm Designated Securities and any Optional Designated
Securities are collectively called the "Designated Securities." The proceeds of
the sale of the Designated Securities and of common securities of the Designated
Trust (the "Common Securities") sold to the Guarantor are to be invested in
junior subordinated deferrable interest debentures of the Guarantor (the
"Subordinated Debentures"), to be issued pursuant to a junior subordinated
indenture (the "Indenture") identified in the Pricing Agreement. The Designated
Securities may be exchangeable into Subordinated Debentures, as specified in
Schedule II to such Pricing Agreement. Pursuant to the Guarantee Agreement
identified in the Pricing Agreement relating to any particular issuance of
Designated Securities, the Designated Securities will be guaranteed by the
Guarantor to the extent set forth in such Pricing Agreement (the "Guarantee").

     The terms and rights of any particular issuance of Designated Securities
shall be as specified in the Pricing Agreement relating thereto and in or
pursuant to the amended and restated trust agreement (the "Trust Agreement")
among the Guarantor, the trustees named therein (the "Trustees") and the holders
from time to time of the Designated Trust's securities issued thereunder.

     Particular sales of Designated Securities may be made from time to time to
the Underwriters of such Securities, for whom the firms designated as
representatives of the Underwriters of such Securities in the Pricing Agreement
relating thereto will act as representatives (the "Representatives"). The term
"Representatives" also refers to a single firm acting as sole representative of
the Underwriters and to Underwriters who act without any firm being designated
as their representative. This Underwriting Agreement shall not be construed as
an obligation of any Trust to sell any of the Securities or as an obligation of
any of the Underwriters to purchase any of the Securities. The obligation of any
Trust to issue and sell any of the Securities and the obligation of any of the
Underwriters to purchase any of the Securities shall be evidenced by the Pricing
Agreement with respect to the Securities specified therein. Each Pricing
Agreement shall specify the aggregate number of Firm Designated Securities, the
aggregate number of Optional Designated Securities, if any, the initial

                                      -2-

 
public offering price of such Firm and Optional Designated Securities or the
manner of determining such price, the terms of the Designated Securities,
including the terms on which and terms of the securities into which the
Designated Securities will be exchangeable, the purchase price to the
Underwriters of such Designated Securities, the names of the Underwriters of
such Designated Securities, the names of the Representatives of such
Underwriters and the number of such Designated Securities to be purchased by
each Underwriter and the commission, if any, payable to the Underwriters with
respect thereto and shall set forth the date, time and manner of delivery of
such Designated Securities and payment therefor. The Pricing Agreement shall
also specify (to the extent not set forth in the Trust Agreement or the
registration statement and prospectus with respect thereto) the terms of such
Designated Securities. A Pricing Agreement shall be in the form of an executed
writing (which may be in counterparts), and may be evidenced by an exchange of
telegraphic communications or any other rapid transmission device designed to
produce a written record of communications transmitted. The obligations of the
Underwriters under this Agreement and each Pricing Agreement shall be several
and not joint.

     1.  Each of the Guarantor and each Designated Trust jointly and severally
represents and warrants to, and agrees with, each of the Underwriters that:

          (a) A registration statement on Form S-3 (File Nos. 333-18951, 333-
     18951-01, 333-18951-02 and 333-18951-03) (the "Initial Registration
     Statement") in respect of the Securities, the Subordinated Debentures and
     the Guarantees has been filed with the Securities and Exchange Commission
     (the "Commission"); the Initial Registration Statement and any post-
     effective amendments thereto, each in the form heretofore delivered or to
     be delivered to the Representatives and, excluding exhibits to such
     registration statement, but including all documents incorporated by
     reference in the prospectus contained therein, to the Representatives for
     each of the other Underwriters, have been declared effective by the
     Commission in such form; no other document (other than a registration
     statement, if any, increasing the size of the offering (a "Rule 462(b)
     Registration Statement"), filed pursuant to Rule 462(b) under the
     Securities Act of 1933, as amended (the "Act"), which became effective

                                      -3-

 
     upon filing) with respect to the Securities, the Subordinated Debentures
     and the Guarantees offered pursuant to the Initial Registration Statement
     or document incorporated by reference therein has heretofore been filed or
     transmitted for filing with the Commission; and no stop order suspending
     the effectiveness of the Initial Registration Statement or the Rule 462(b)
     Registration Statement has been issued and no proceeding for that purpose
     has been initiated or threatened by the Commission (any preliminary
     prospectus included in the Initial Registration Statement or filed with the
     Commission pursuant to Rule 424(a) of the rules and regulations of the
     Commission under the Act, being hereinafter called a "Preliminary
     Prospectus"; the various parts of the Initial Registration Statement,
     including (i) the information contained in the form of final prospectus
     filed with the Commission pursuant to Rule 424(b) under the Act in
     accordance with Section 4(a) hereof and deemed by virtue of Rule 430A under
     the Act to be part of the Initial Registration Statement at the time it was
     declared effective or such part of the Rule 462(b) Registration Statement
     that became or hereafter becomes effective, each as amended at the time
     such part of a registration statement became effective, and (ii) all
     exhibits thereto and the documents incorporated by reference in the
     prospectus contained in a registration statement at the time such part of a
     registration statement became effective, being hereinafter collectively
     called a "Registration Statement"; the prospectus relating to the
     Securities, the Subordinated Debentures and the Guarantees, in the form in
     which it has most recently been filed, or transmitted for filing, with the
     Commission on or prior to the date of this Agreement, being hereinafter
     called the "Prospectus"; any reference herein to any Preliminary Prospectus
     or the Prospectus shall be deemed to refer to and include the documents
     incorporated by reference therein pursuant to the applicable form under the
     Act, as of the date of such Preliminary Prospectus or Prospectus, as the
     case may be; any reference to any amendment or supplement to any
     Preliminary Prospectus or the Prospectus shall be deemed to refer to and
     include any documents filed after the date of such Preliminary Prospectus
     or Prospectus, as the case may be, under the Securities Exchange Act of
     1934, as amended (the "Exchange Act"), and incorporated by

                                      -4-

 
     reference in such Preliminary Prospectus or Prospectus, as the case may be;
     any reference to any amendment to a Registration Statement shall be deemed
     to refer to and include any annual report of the Guarantor filed pursuant
     to Section 13(a) or 15(d) of the Exchange Act after the effective date of
     such Registration Statement that is incorporated by reference in such
     Registration Statement; and any reference to the Prospectus, as amended or
     supplemented, shall be deemed to refer to the Prospectus, as amended or
     supplemented, in relation to the applicable Designated Securities in the
     form in which it is filed with the Commission pursuant to Rule 424(b) under
     the Act in accordance with Section 4(a) hereof, including any documents
     incorporated by reference therein as of the date of such filing);

          (b)  No order preventing or suspending the use of any Preliminary
     Prospectus has been issued by the Commission, and each Preliminary
     Prospectus, at the time of filing thereof, conformed in all material
     respects to the requirements of the Act and the rules and regulations of
     the Commission thereunder, and did not contain an untrue statement of a
     material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading; provided,
     however, that this representation and warranty shall not apply to any
     statements or omissions made in reliance upon and in conformity with
     information furnished in writing to a Designated Trust or the Guarantor by
     an Underwriter of Designated Securities through the Representatives
     expressly for use in the Prospectus, as amended or supplemented, relating
     to such Securities.

          (c)  The documents incorporated by reference in the Prospectus, when
     they became effective or were filed with the Commission, as the case may
     be, conformed in all material respects to the requirements of the Act or
     the Exchange Act, as applicable, and the rules and regulations of the
     Commission thereunder, and none of such documents contained an untrue
     statement of a material fact or omitted to state a material fact required
     to be stated therein or necessary to make the statements therein not
     misleading; and any further documents so filed and incorporated by
     reference in the Prospectus or any further amendment or supplement

                                      -5-

 
     thereto, when such documents become effective or are filed with the
     Commission, as the case may be, will conform in all material respects to
     the requirements of the Act or the Exchange Act, as applicable, and the
     rules and regulations of the Commission thereunder and will not contain an
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein
     not misleading; provided, however, that this representation and warranty
     shall not apply to any statements or omissions made in reliance upon and in
     conformity with information furnished in writing to a Designated Trust or
     the Guarantor by an Underwriter of Designated Securities through the
     Representatives expressly for use in the Prospectus, as amended or
     supplemented, relating to such Securities;

          (d)  The Initial Registration Statement, any Rule 462(b) Registration
     Statement and the Prospectus conform, and any further amendments or
     supplements to the Initial Registration Statement, any Rule 462(b)
     Registration Statement or the Prospectus will conform, in all material
     respects to the requirements of the Act and the Trust Indenture Act of
     1939, as amended (the "Trust Indenture Act"), and the rules and regulations
     of the Commission thereunder and do not and will not, as of the applicable
     effective date as to the Initial Registration Statement and any Rule 462(b)
     Registration Statement and any amendment thereto and as of the applicable
     filing date as to the Prospectus and any amendment or supplement thereto,
     contain an untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading; provided, however, that this representation and
     warranty shall not apply to any statements or omissions made in reliance
     upon and in conformity with information furnished in writing to a
     Designated Trust or the Guarantor by an Underwriter of Designated
     Securities through the Representatives expressly for use in the Prospectus,
     as amended or supplemented, relating to such Securities;

          (e)  Since the respective dates as of which information is given in
     the Initial Registration Statement, any Rule 462(b) Registration Statement
     and the Prospectus, there has not been any material adverse 

                                      -6-

 
     change, or any development involving a prospective material adverse change,
     in or affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Guarantor and its
     subsidiaries, considered as a whole, otherwise than as set forth or
     contemplated in the Prospectus; and, since the respective dates as of which
     information is given in the Initial Registration Statement, any Rule 462(b)
     Registration Statement and the Prospectus and except as otherwise set forth
     therein, there has not been any change in the capital stock (other than the
     Guarantor's purchase of treasury stock in connection with its buy back
     program and the issuance of stock upon the exercise of employee stock
     options, director stock awards, bonus stock awards and earn-outs of
     performance shares) or long-term debt in excess of $10 million of the
     Guarantor or any of its subsidiaries, otherwise than as set forth or
     contemplated in the Prospectus;

          (f)  The Guarantor has been duly incorporated and is validly existing
     as a corporation in good standing under the laws of the jurisdiction of its
     incorporation, with power and authority (corporate and other) to own its
     properties and conduct its business as described in the Prospectus, and has
     been duly qualified as a foreign corporation for the transaction of
     business and is in good standing under the laws of each other jurisdiction
     in which it owns or leases properties or conducts any business so as to
     require such qualification, or is subject to no material liability or
     disability by reason of the failure to be so qualified in any such
     jurisdiction; each subsidiary of the Guarantor has been duly incorporated
     and is validly existing as a corporation in good standing under the laws of
     the jurisdiction of its incorporation, except where such failure to be in
     good standing would not have a material adverse effect on the financial
     condition, operating results or business prospects of such subsidiary; and
     The Northern Trust Company (the "Bank") has the power and authority
     (corporate and other) to own its properties and conduct its business as
     described in the Prospectus;

          (g)  The Guarantor is duly registered under the Bank Holding Company
     Act of 1956, as amended; and each subsidiary of the Guarantor which
     conducts business as 

                                      -7-

 
     a bank is duly authorized to conduct such banking business in each
     jurisdiction in which such banking business is conducted;

          (h) The Guarantor has an authorized capitalization as set forth in the
     Prospectus, and all the issued shares of capital stock of the Guarantor
     have been duly and validly authorized and issued and are fully paid and
     non-assessable; and all of the issued shares of capital stock of each
     subsidiary of the Guarantor have been duly and validly authorized and
     issued, are fully paid and non-assessable, except as provided in 12 U.S.C.
     Section 55, and (except for directors' qualifying shares and except as set
     forth in the Prospectus) are owned directly or indirectly by the Guarantor,
     free and clear of all liens, encumbrances, equities or claims;

          (i)  The Designated Trust has been duly created and is validly
     existing as a statutory business trust in good standing under the Delaware
     Business Trust Act with the power and authority to own its properties and
     conduct its business as described in the Prospectus, and the Designated
     Trust has conducted no business to date other than as contemplated by this
     Agreement and any Pricing Agreement, and it will conduct no business in the
     future that would be inconsistent with the Trust Agreement and the
     description of the Designated Trust set forth in the Prospectus; the
     Designated Trust is not a party to or bound by any agreement or instrument
     other than this Agreement, any Pricing Agreement, the Trust Agreement and
     the agreements and instruments contemplated by the Trust Agreement; the
     Designated Trust has no liabilities or obligations other than those arising
     out of the transactions contemplated by this Agreement, any Pricing
     Agreement and the Trust Agreement and described in the Prospectus; based on
     expected operations and current law, the Designated Trust is not and will
     not be classified as an association taxable as a corporation for United
     States federal income tax purposes; and the Designated Trust is not a party
     to or subject to any action, suit or proceeding of any nature;

          (j)  The Designated Securities have been duly and validly authorized
     by the Designated Trust, and, when issued and delivered against payment
     therefor as
                
                                      -8-

 
     provided herein, will be duly and validly issued and fully paid and non-
     assessable undivided beneficial interests in the assets of the Designated
     Trust and will conform to the description of the Designated Securities
     contained in the Prospectus; the issuance of the Designated Securities is
     not subject to preemptive or other similar rights; the Designated
     Securities will have the rights set forth in the Trust Agreement, and the
     terms of the Designated Securities are valid and binding on the Designated
     Trust; and the holders of the Designated Securities (the "Securityholders")
     will be entitled to the same limitation of personal liability extended to
     stockholders of private corporations for profit organized under the General
     Corporation Law of the State of Delaware;

          (k)  The Common Securities of the Designated Trust have been duly and
     validly authorized by the Designated Trust and, upon delivery by the
     Designated Trust to the Guarantor against payment therefor as described in
     the Prospectus, will be duly and validly issued undivided beneficial
     interests in the assets of the Designated Trust and will conform in all
     material respects to the description thereof contained in the Prospectus;
     the issuance of the Common Securities is not subject to preemptive or other
     similar rights; and at the Time of Delivery, all of the issued and
     outstanding Common Securities of the Designated Trust will be directly
     owned by the Guarantor free and clear of any security interest, mortgage,
     pledge, lien, encumbrance, claim or equity;

          (l)  The Guarantee, the Subordinated Debentures, the Trust Agreement,
     the Indenture and the Agreement as to Expenses and Liabilities between the
     Guarantor and the Designated Trust (the "Expense Agreement"); the
     Guarantee, the Subordinated Debentures, the Trust Agreement, the Indenture
     and the Expense Agreement being collectively referred to as the "Guarantor
     Agreements"), when validly executed and delivered by the Guarantor and, in
     the case of the Guarantee, by the Guarantee Trustee, in the case of the
     Trust Agreement, by the Trustees and, in the case of the Indenture, by the
     Debenture Trustee, will constitute valid and legally binding obligations of
     the Guarantor, enforceable in accordance with their respective terms,
     except as such enforcement may be limited by (i) bank-

                                      -9-

 
     ruptcy, insolvency, moratorium, receivership, reorganization, liquidation,
     fraudulent conveyance or transfer and other laws relating to or affecting
     creditors' rights generally, (ii) by general equitable principles and
     (iii), with respect to the Expense Agreement, the effect of public policy
     on the enforceability of provisions relating to indemnification and
     contribution; the Subordinated Debentures are entitled to the benefits of
     the Indenture; and the Guarantor Agreements will conform to the
     descriptions thereof in the Prospectus;

          (m)  The execution and delivery of this Agreement, any Pricing
     Agreement and the Guarantor Agreements, and the consummation of the
     transactions contemplated herein and therein, have been duly authorized by
     all necessary corporate action and when executed by the Guarantor and the
     other parties thereto will not result in a breach or violation of any of
     the terms or provisions of, or constitute a default under, or result in the
     creation or imposition of any security interest, lien, charge or
     encumbrance upon any property or assets of the Guarantor (other than the
     Designated Trust), pursuant to any indenture, mortgage, deed of trust, loan
     agreement, contract or other agreement or instrument to which the Guarantor
     is a party or by which the Guarantor is bound or to which any of its
     property or assets is subject, or to which any subsidiary of the Guarantor
     is a party or by which any subsidiary of the Guarantor is bound or to which
     any of its assets or property is subject where such subsidiary's breach or
     violation would have a material adverse effect on the Guarantor and its
     subsidiaries, considered as a whole, or would materially impair the ability
     of the Guarantor to perform any of its obligations hereunder, under any
     Pricing Agreement or in the Guarantor Agreements, nor will such action
     result in any violation of the provisions of the Restated Certificate of
     Incorporation, as amended, or the By-laws of the Guarantor or any statute
     or any order, rule or regulation of any court or governmental agency or
     body having jurisdiction over the Guarantor, its subsidiaries or any of
     their respective properties; and no consent, approval, authorization,
     order, registration or qualification of or with any such court or
     governmental agency or body is required for the issue and sale of the
     Designated Securities or the

                                     -10-

 
     consummation by the Guarantor or the Designated Trust of the transactions
     contemplated by this Agreement, any Pricing Agreement or the Guarantor
     Agreements, except such as have been, or will have been, obtained or
     received prior to the applicable First Time of Delivery (as defined in
     Section 3 hereof) and such consents, approvals, authorizations,
     registrations or qualifications as may be required under state securities
     or Blue Sky laws in connection with the purchase and distribution of the
     Designated Securities by the Underwriters;

          (n)  Neither the Designated Trust nor the Guarantor is, and after
     giving effect to the offering and sale of the Designated Securities,
     neither the Designated Trust nor the Guarantor will be, an "investment
     company", or an entity "controlled" by an "investment company", as such
     terms are defined in the Investment Company Act of 1940, as amended (the
     "Investment Company Act");

          (o)  Except as set forth or contemplated in the Prospectus, there is
     not pending or, to the Guarantor's knowledge, threatened, any actions,
     suits or proceedings to which the Guarantor or any of its subsidiaries is a
     party, before or by any court or governmental agency or body, which, taking
     into account the likelihood of the outcome, the damages or other relief
     sought and other relevant factors, individually and in the aggregate, would
     reasonably be expected to result in any material adverse change, or any
     development involving a prospective material adverse change, in or
     affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Guarantor and its
     subsidiaries taken as a whole;

          (p)  The statements set forth in the Prospectus under the captions
     "Description of Junior Subordinated Debentures", "Description of Preferred
     Securities", "Description of Guarantees" and "Relationship Among the
     Preferred Securities, the Corresponding Junior Subordinated Debentures, the
     Expense Agreement and the Guarantees", insofar as they constitute a summary
     of the terms of the Securities, the Subordinated Debentures, the Guarantees
     and the Guarantor Agreements, are accurate and complete in all material
     respects;

                                     -11-

 
          (q)  To the Guarantor's knowledge, Arthur Andersen LLP, who certified
     the financial statements of the Guarantor and its subsidiaries included in
     or incorporated by reference in the Prospectus, are independent public
     accountants as required by the Act and the rules and regulations of the
     Commission thereunder; and

          (r)  The Guarantor and its affiliates have complied, and as of the
     date of any Pricing Agreement will comply, with all of the provisions of
     Section 517.075, Florida Statutes, and all rules and regulations
     promulgated thereunder, relating to issuers doing business in Cuba.

     2.   Upon the execution of the Pricing Agreement applicable to any
Designated Securities and authorization by the Representatives of the release of
such Designated Securities, the several Underwriters propose to offer the Firm
Designated Securities for sale upon the terms and conditions set forth in the
Prospectus, as amended or supplemented.

          The Designated Trust may specify in the Pricing Agreement applicable
to any Designated Securities that the Designated Trust thereby grants to the
Underwriters the right (an "Over-allotment Option") to purchase at their
election up to the number of Optional Designated Securities set forth in such
Pricing Agreement, on the terms set forth in the paragraph above, for the sole
purpose of covering over-allotments in the sale of the Firm Designated
Securities. Any such election to purchase Optional Designated Securities may be
exercised only by written notice from the Representatives to the Designated
Trust and the Guarantor, given within a period specified in the Pricing
Agreement, setting forth the aggregate number of Optional Designated Securities
to be purchased and the date on which such Optional Designated Securities are to
be delivered, as determined by the Representatives but in no event earlier than
the First Time of Delivery or, unless the Representatives, the Guarantor and the
Designated Trust otherwise agree in writing, earlier than or later than the
respective number of business days after the date of such notice set forth in
such Pricing Agreement.

          The number of Optional Designated Securities to be added to the number
of Firm Designated Securities to be

                                     -12-

 
purchased by each Underwriter as set forth in Schedule I to the Pricing
Agreement applicable to such Designated Securities shall be, in each case, the
number of Optional Designated Securities which each of the Guarantor and the
Designated Trust has been advised by the Representatives have been attributed to
such Underwriter, provided that, if each of the Guarantor and the Designated
Trust has not been so advised, the number of Optional Designated Securities to
be so added shall be, in each case, that proportion of Optional Designated
Securities which the number of Firm Designated Securities to be purchased by
such Underwriter under such Pricing Agreement bears to the aggregate number of
Firm Designated Securities (rounded as the Representatives may determine to the
nearest 100 securities). The total number of Designated Securities to be
purchased by all the Underwriters pursuant to such Pricing Agreement shall be
the aggregate number of Firm Designated Securities set forth in Schedule I to
such Pricing Agreement plus the aggregate number of Optional Designated
Securities which the Underwriters elect to purchase.

     3.   Designated Securities to be purchased by each Underwriter pursuant to
the Pricing Agreement relating thereto, in definitive form to the extent
practicable, and in such authorized denominations and registered in such names
as the Representatives may request upon at least forty-eight hours' prior notice
to the Designated Trust, shall be delivered by or on behalf of the Designated
Trust to the Representatives for the account of such Underwriter, against
payment by such Underwriter or on its behalf of the purchase price therefor by
certified or official bank check or checks, payable to the order of the
Designated Trust in the funds specified in such Pricing Agreement, all in the
manner and at the place and time and date specified in such Pricing Agreement or
at such other place and time and date as the Representatives and the Designated
Trust may agree upon in writing. Such time and date for delivery of Firm
Designated Securities pursuant to the Pricing Agreement relating thereto is
herein called the "First Time of Delivery," such time and date for delivery of
Optional Designated Securities, if not the First Time of Delivery, is herein
called the "Second Time of Delivery," and each such time and date is herein
called the "Time of Delivery."

                                      -13-

 
     4.   The Designated Trust and the Guarantor jointly and severally agree
with each of the Underwriters of any Designated Securities:

          (a)  To prepare the Prospectus as amended and supplemented in relation
     to the applicable Designated Securities in a form approved by the
     Representatives and to file such Prospectus pursuant to Rule 424(b) under
     the Act not later than the Commission's close of business on the second
     business day following the execution and delivery of the Pricing Agreement
     relating to the applicable Designated Securities or, if applicable, such
     earlier time as may be required by Rule 424(b); to make no further
     amendment or any supplement to the Initial Registration Statement or any
     Rule 462(b) Registration Statement or Prospectus, as amended or
     supplemented, after the date of the Pricing Agreement relating to such
     Securities and prior to the Time of Delivery for such Securities which
     shall be disapproved by the Representatives for such Securities promptly
     after reasonable notice thereof, to advise you promptly after it receives
     notice thereof of the time when the Initial Registration Statement or any
     Rule 462(b) Registration Statement, or any amendment thereto, has been
     filed or becomes effective or any supplement to the Prospectus or any
     amended Prospectus has been filed and to furnish the Representatives with
     copies thereof; to advise the Representatives promptly of any such
     amendment or supplement after such Time of Delivery and furnish the
     Representatives with copies thereof; to file promptly all reports and any
     definitive proxy or information statements required to be filed by the
     Guarantor with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d)
     of the Exchange Act subsequent to the date of the Prospectus and for so
     long as the delivery of a prospectus is required in connection with the
     offering or sale of such Securities, and during such same period to advise
     the Representatives, promptly after it receives notice thereof, of the time
     when any amendment to the Initial Registration Statement or any Rule 462(b)
     Registration Statement has been filed or becomes effective or any
     supplement to the Prospectus or any amended Prospectus has been filed with
     the Commission, of the issuance by the Commission of any stop order or of
     any order preventing or suspending the use of any prospectus relating to
     the Securities, of the suspension of the

                                     -14-

 
     qualification of such Securities or the Subordinated Debentures issuable
     upon exchange of the Securities for offering or sale in any jurisdiction,
     of the initiation or threatening of any proceeding for any such purpose, or
     of any request by the Commission for the amending or supplementing of the
     Initial Registration Statement or any Rule 462(b) Registration Statement or
     Prospectus or for additional information; and, in the event of the issuance
     of any such stop order or of any such order preventing or suspending the
     use of any prospectus relating to the Securities or suspending any such
     qualification, to use promptly its best efforts to obtain its withdrawal;

          (b)  Promptly from time to time to take such action as the
     Representatives may reasonably request to qualify such Securities or the
     Subordinated Debentures issuable upon exchange of the Securities for
     offering and sale under the securities laws of such jurisdictions as the
     Representatives may request and to comply with such laws so as to permit
     the continuance of sales and dealings therein in such jurisdictions for as
     long as may be necessary to complete the distribution of such Designated
     Securities, provided that in connection therewith neither the Designated
     Trust nor the Guarantor shall be required to qualify as a foreign
     corporation or to file a general consent to service of process in any
     jurisdiction;

          (c)  To furnish the Underwriters with copies of the Prospectus, as
     amended or supplemented, in such quantities as the Representatives may from
     time to time reasonably request, and, if the delivery of a prospectus is
     required at any time prior to the expiration of nine months after the time
     of issue of the Prospectus in connection with the offering or sale of the
     Securities or the Subordinated Debentures issuable upon exchange of the
     Securities and if at such time any event shall have occurred as a result of
     which the Prospectus as then amended or supplemented would include an
     untrue statement of a material fact or omit to state any material fact
     necessary in order to make the statements therein, in the light of the
     circumstances under which they were made when such Prospectus is delivered,
     not misleading, or, if for any other reason it shall be necessary during
     such same period to amend or supplement the Prospectus or to file

                                     -15-

 
     under the Exchange Act any document incorporated by reference in the
     Prospectus in order to comply with the Act, the Exchange Act or the Trust
     Indenture Act, to notify the Representatives and upon the request of the
     Representatives to file such document and to prepare and furnish without
     charge to each Underwriter and to any dealer in securities as many copies
     as the Representatives may from time to time reasonably request of an
     amended Prospectus or a supplement to the Prospectus which will correct
     such statement or omission or effect such compliance, and in case any
     Underwriter is required to deliver a prospectus in connection with the
     offering or sale of the Securities or the Subordinated Debentures issuable
     upon exchange of the Securities at any time nine months or more after the
     time of issue of the Prospectus, upon an Underwriter's request but at the
     expense of such Underwriter, to prepare and deliver to such Underwriter as
     many copies as such Underwriter may request of an amended or supplemented
     Prospectus complying with Section 10(a)(3) of the Act;

          (d)  In the case of the Guarantor, to make generally available to its
     security holders as soon as practicable, but in any event not later than
     eighteen months after the effective date of the Initial Registration
     Statement (as defined in Rule 158(c)), an earnings statement of the
     Guarantor and its subsidiaries (which need not be audited) complying with
     Section 11(a) of the Act and the rules and regulations of the Commission
     thereunder (including, at the option of the Guarantor, Rule 158);

          (e)  During the period beginning from the date of the Pricing
     Agreement for such Designated Securities and continuing to and including
     the later of (i) the termination of trading restrictions for such
     Designated Securities, as notified to the Guarantor by the Representatives
     and (ii) the last Time of Delivery for such Designated Securities, not to
     offer, sell, contract to sell or otherwise dispose of, except as provided
     hereunder, any Securities, any other beneficial interests in the assets of
     the Designated Trust, or any preferred securities or any other securities
     of the Designated Trust or the Guarantor, as the case may be, that are
     substantially similar to such Designated Securities (including any
     guarantee of such

                                     -16-

 
     securities) or any securities that are convertible into or exchangeable
     for, or that represent the right to receive securities, preferred
     securities or any such substantially similar securities of either the
     Designated Trust or the Guarantor without the prior written consent of the
     Representatives;

          (f)  Not to have the Designated Trust be or become, at any time prior
     to the expiration of three years after the Time of Delivery, an open-end
     investment company, unit investment trust, closed-end investment company or
     face-amount certificate company that is or is required to be registered
     under Section 8 of the Investment Company Act;

          (g)  In the case of the Guarantor, to issue the Guarantee concurrently
     with the issue and sale of the Designated Securities as contemplated herein
     or in the Pricing Agreement;

          (h)  If provided in the applicable Pricing Agreement, to use its best
     efforts to list, subject to notice of issuance, the Designated Securities
     on the Nasdaq Stock Market; and

          (i)  If the Guarantor and the Designated Trust elect to rely upon Rule
     462(b) under the Act, the Guarantor and the Designated Trust shall file a
     Rule 462(b) Registration Statement with the Commission in compliance with
     Rule 462(b) under the Act by 10:00 P.M., Washington, D.C. time, on the date
     of the applicable Pricing Agreement, and the Guarantor and the Designated
     Trust shall at the time of filing either pay to the Commission the filing
     fee for the Rule 462(b) Registration Statement or give irrevocable
     instructions for the payment of such fee pursuant to Rule 111(b) under the
     Act.

     5.  The Guarantor and the Designated Trust jointly and severally covenant
and agree with the several Underwriters that the Guarantor and the Designated
Trust will pay or cause to be paid the following: (i) the fees, disbursements
and expenses of the Guarantor's or the Designated Trust's counsel and
accountants in connection with the issue of the Designated Securities and all
other expenses in connection with the preparation, printing and distribution of
any Registration Statement, any Preliminary Prospectus and the

                                     -17-

 
Prospectus and any amendments and supplements thereto and the mailing and
delivering of copies thereof to the Underwriters and dealers; (ii) the cost of
printing or producing any Agreement among Underwriters, this Agreement, any
Pricing Agreement, any Guarantor Agreement, any Blue Sky and Legal Investment
Memoranda, closing documents (including any compilations thereof) and any other
documents in connection with the offering, purchase, sale and delivery of the
Designated Securities; (iii) all expenses in connection with the qualification
of the Designated Securities and the Subordinated Debentures issuable upon
exchange of the Securities for offering and sale under state securities laws as
provided in Section 4(b) hereof, including the reasonable fees and disbursements
of counsel for the Underwriters in connection with such qualification and in
connection with the Blue Sky and legal investment surveys; (iv) any fees charged
by securities rating services for rating the Designated Securities and the
Subordinated Debentures; (v) any filing fees incident to, and the fees and
disbursements of counsel for the Underwriters in connection with, any required
reviews by the National Association of Securities Dealers, Inc. of the terms of
the sale of the Designated Securities and the issuance of the Guarantees and the
Subordinated Debentures; (vi) the cost of preparing certificates for the
Designated Securities and the Subordinated Debentures; (vii) the fees and
expenses of the Trustees, the Debenture Trustee and the Guarantee Trustee and
any agent of the Guarantee Trustee and the Debenture Trustee and the fees and
disbursements of counsel for the Trustees in connection with the Trust Agreement
and the Designated Securities, counsel for the Guarantee Trustee in connection
with the Guarantee and counsel for the Debenture Trustee in connection with the
Indenture and the Subordinated Debentures; (viii) the cost of qualifying the
Designated Securities with The Depository Trust Company; (ix) all fees and
expenses, if any, in connection with the listing of the Designated Securities on
the Nasdaq Stock Market and the cost of registering the Designated Securities
under Section 12 of the Exchange Act; and (x) all other costs and expenses
incident to the performance of its obligations hereunder and under any Over-
allotment Option which are not otherwise specifically provided for in this
Section. It is understood, however, that, except as provided in this Section,
Section 7 and Section 10 hereof, the Underwriters will pay all of their own
costs and expenses, including the fees of their counsel, transfer taxes on
resale of any of the Designated Securities by them,

                                     -18-

 
and any advertising expenses connected with any offers they may make.

     6.  The obligations of the Underwriters of any Designated Securities under
the Pricing Agreement relating to such Designated Securities shall be subject,
in the discretion of the Representatives, to the condition that all
representations and warranties and other statements of the Designated Trust and
the Guarantor in or incorporated by reference in the Pricing Agreement relating
to such Designated Securities are, at and as of the respective Time of Delivery
for such Designated Securities, true and correct, the condition that the
Designated Trust and the Guarantor shall have performed all of their respective
obligations hereunder theretofore to be performed, and the following additional
conditions:

          (a)  The Prospectus, as amended or supplemented, in relation to the
     applicable Designated Securities shall have been filed with the Commission
     pursuant to Rule 424(b) within the applicable time period prescribed for
     such filing by the rules and regulations under the Act and in accordance
     with Section 4(a) hereof; if the Guarantor and the Designated Trust have
     elected to rely upon Rule 462(b) under the Act, the Rule 462(b)
     Registration Statement shall have become effective by 10:00 P.M.,
     Washington, D.C. time, on the date of the applicable Pricing Agreement; no
     stop order suspending the effectiveness of any Registration Statement or
     any part thereof shall have been issued and no proceeding for that purpose
     shall have been initiated or threatened by the Commission; and all requests
     for additional information on the part of the Commission shall have been
     complied with to the Representatives' reasonable satisfaction;

          (b)  Sullivan & Cromwell shall have furnished to the Representatives
     such opinion or opinions, dated the respective Time of Delivery for such
     Designated Securities, with respect to such matters as the Representatives
     may reasonably request, and such counsel shall have received such papers
     and information as they may reasonably request to enable them to pass upon
     such matters. In giving such opinion, Sullivan & Cromwell may rely, as to
     all matters governed by the laws of jurisdictions in which such counsel is
     not qualified, upon opinions of other counsel, who shall be

                                     -19-

 
     counsel satisfactory to counsel for the Representatives, in which case the
     opinion or opinions shall state that they believe you and they are entitled
     to rely on such opinions;

          (c)  Peter L. Rossiter, Esq., or the then General Counsel for the
     Guarantor, shall have furnished to the Representatives his or her written
     opinion, dated the respective Time of Delivery for such Designated
     Securities, in form and substance satisfactory to the Representatives, to
     the effect that:

               (i)    All of the issued shares of capital stock of the Guarantor
          have been duly and validly authorized and issued and are fully paid
          and non-assessable;

               (ii)   Each subsidiary of the Guarantor which conducts business
          as a bank is duly authorized to conduct such banking business and/or
          trust business as it conducts in each jurisdiction in the United
          States in which it maintains offices for the conduct of such banking
          and/or trust business (such counsel being entitled to rely in respect
          of the opinion in this clause upon opinions of local counsel and in
          respect of matters of fact upon certificates of officers of the
          Guarantor, provided that such counsel shall state that he believes
          that both you and he are justified in relying upon such opinions and
          certificates);

               (iii)  All of the issued and outstanding shares of capital stock
          of each of the "significant subsidiaries" of the Guarantor, as defined
          in Regulation S-X adopted by the Commission, have been duly and
          validly authorized and issued and are fully paid and non-assessable,
          except as provided in 12 U.S.C. Section 55; and all of such shares of
          capital stock are owned directly or indirectly by the Guarantor free
          and clear of any liens, claims, encumbrances or rights of others
          (except for directors' qualifying shares and except as set forth in
          the Prospectus, as amended or supplemented); and

                                     -20-

 
               (iv) The documents, as amended prior to the date hereof,
          incorporated by reference in the Prospectus (other than the financial
          statements and related financial information and schedules therein, as
          to which such counsel need express no opinion), when they were filed
          with the Commission or as so amended, complied as to form in all
          material respects with the requirements of the Exchange Act and the
          rules and regulations of the Commission thereunder; and he has no
          reason to believe that any such documents, when such documents were so
          filed, contained an untrue statement of a material fact or omitted to
          state a material fact necessary in order to make the statements
          therein, in light of the circumstances under which they were made when
          such documents were so filed, not misleading.

          (d) Schiff Hardin & Waite, counsel for the Designated Trust and the
     Guarantor, shall have furnished to the Representatives their written
     opinion, dated the respective Time of Delivery for such Designated
     Securities, in form and substance satisfactory to the Representatives, to
     the effect that:

               (i) The Guarantor has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of Delaware,
          with corporate power and authority to own its properties and conduct
          its business as described in the Prospectus, as amended or
          supplemented;

               (ii) The Guarantor has an authorized capitalization as set
          forth in the Prospectus, as amended or supplemented;

               (iii) The Guarantor has been duly qualified as a foreign
          corporation for the transaction of business and is in good standing
          under the laws of each jurisdiction in which it owns or leases
          properties or conducts any business so as to require such
          qualification or is subject to no material liability or disability by
          reason of the failure to be so qualified in any such jurisdiction
          (such counsel being entitled to rely in respect of the opinion in this
          clause upon

                                     -21-

 
          opinions of local counsel and in respect of matters of fact upon
          certificates of officers of the Guarantor, provided that such counsel
          shall state that they believe both you and they are justified in
          relying upon such opinions or certificates);

               (iv) The Bank has been duly incorporated and is validly
          existing as a banking corporation in good standing under the laws of
          Illinois, with power and authority (corporate and other) to own its
          properties and conduct its business as described in the Prospectus, as
          amended or supplemented;

               (v) The Guarantor is duly registered under the Bank Holding
          Company Act of 1956, as amended;

               (vi) This Agreement and the Pricing Agreement with respect to
          the Designated Securities have been duly authorized, executed and
          delivered by the Designated Trust and the Guarantor;

               (vii) The Guarantor Agreements have each been duly authorized,
          executed and delivered by the Guarantor and/or the Designated Trust,
          as the case may be, and the Guarantor Agreements (other than the Trust
          Agreement, as to which such counsel need express no opinion)
          constitute valid and legally binding instruments and obligations of
          the Guarantor and/or the Designated Trust, as the case may be,
          enforceable against the Guarantor and/or the Designated Trust, as the
          case may be, in accordance with their respective terms, except as such
          enforcement may be limited by (a) bankruptcy, insolvency, moratorium,
          receivership, reorganization, liquidation, fraudulent conveyance or
          transfer and other laws relating to or affecting creditors' rights
          generally, (b) by general equitable principles and (c), with respect
          to the Expense Agreement, the effect of public policy on the
          enforceability of provisions relating to indemnification and
          contribution; and the Subordinated Debentures are entitled to the
          benefits provided by the Indenture;

                                     -22-

 
               (viii) No consent, approval, authorization, order, registration
          or qualification of or with any court or governmental agency or body
          is required for the issue and sale of the Guarantee or the
          Subordinated Debentures or consummation by the Guarantor of the
          transactions contemplated by this Agreement or the Guarantor
          Agreements, except such consents, approvals, authorizations,
          registrations or qualifications as may be required under state
          securities or Blue Sky laws in connection with the purchase and
          distribution of the Designated Securities by the Underwriters;

               (ix) The issue by the Guarantor of the Guarantee and the
          Subordinated Debentures, the compliance by the Guarantor with all of
          the provisions of this Agreement and the Guarantor Agreements, the
          execution, delivery and performance by the Guarantor of this Agreement
          and the Guarantor Agreements and the consummation of the transactions
          herein and therein contemplated will not result in a breach or
          violation of any of the terms or provisions of, or constitute a
          default under, any indenture, mortgage, deed of trust, loan agreement
          or other agreement or instrument filed by the Guarantor as an exhibit
          to any report filed pursuant to the Act or Exchange Act on or after
          the filing of the Annual Report on Form 10-K for the year ended
          December 31, 1996, where such subsidiary's breach or violation would
          have a material adverse effect on the Guarantor and its subsidiaries,
          considered as a whole, or would materially impair the ability of the
          Guarantor to perform any of its obligations hereunder or under the
          Guarantor Agreements, nor will such actions result in any violation of
          the provisions of the Restated Certificate of Incorporation, as
          amended, or By-Laws of the Guarantor or, to the knowledge of such
          counsel, any statute or any order, rule or regulation of any court or
          governmental agency or body having jurisdiction over the Guarantor or
          any of its subsidiaries or any of their properties;

               (x) The statements set forth in the Prospectus under the
          caption "Description of Junior Subordinated Debentures", "Description
          of

                                     -23-

 
          Preferred Securities", "Description of Guarantees", "Description of
          Corresponding Junior Subordinated Debentures" and "Relationship Among
          the Preferred Securities, the Corresponding Junior Subordinated
          Debentures, the Expense Agreement and the Guarantees" insofar as they
          purport to summarize certain provisions of documents specifically
          referred to therein, are accurate summaries of such provisions in all
          material respects;

               (xi) Neither the Designated Trust nor the Guarantor is an
          "investment company" or an entity controlled by an "investment
          company" required to be registered under the Investment Company Act;

               (xii) The documents, as amended prior to the date hereof,
          incorporated by reference in the Prospectus, as amended or
          supplemented (other than the financial statements and related
          financial information and schedules therein, as to which such counsel
          need express no opinion), when they became effective or were filed
          with the Commission, as the case may be, complied as to form in all
          material respects with the requirements of the Act or the Exchange
          Act, as applicable, and the rules and regulations of the Commission
          thereunder; and nothing has come to such counsel's attention that
          would lead such counsel to believe that any of such documents, when
          they became effective or were so filed, as the case may be, contained,
          in the case of a registration statement which became effective under
          the Act, an untrue statement of a material fact or omitted to state a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, and, in the case of other documents
          which were filed under the Act or the Exchange Act with the
          Commission, an untrue statement of a material fact or omitted to state
          a material fact necessary in order to make the statements therein, in
          the light of the circumstances under which they were made when such
          documents were so filed, not misleading; it being understood that such
          counsel need express no opinion as to the financial statements or
          other financial information included in any of the

                                     -24-

 
          documents mentioned in this clause and that such counsel may state
          that they have not independently verified factual statements in any
          such documents; and

               (xiii) The Initial Registration Statement, any Rule 462(b)
          Registration Statement and the Prospectus, as amended or supplemented,
          and any further amendments and supplements thereto made by the
          Guarantor or the Designated Trust prior to the Time of Delivery for
          the Designated Securities (other than the financial statements and
          related financial information and schedules therein, as to which such
          counsel need express no opinion) comply as to form in all material
          respects with the requirements of the Act and the Trust Indenture Act
          and the rules and regulations thereunder; and nothing has come to such
          counsel's attention that would lead such counsel to believe that, as
          of its effective date, any Registration Statement or any further
          amendment thereto made by the Guarantor or the Designated Trust prior
          to the Time of Delivery (other than the financial statements and
          related financial information and schedules therein, as to which such
          counsel need express no opinion) contained an untrue statement of a
          material fact or omitted to state a material fact required to be
          stated therein or necessary to make the statements therein not
          misleading or that, as of its date, the Prospectus, as amended or
          supplemented, or any further amendment or supplement thereto made by
          the Guarantor or the Designated Trust prior to the Time of Delivery
          (other than the financial statements and related financial information
          and schedules therein, as to which such counsel need express no
          opinion) contained an untrue statement of a material fact or omitted
          to state a material fact necessary in order to make the statements
          therein, in light of the circumstances in which they were made, not
          misleading or that, as of the Time of Delivery, either any
          Registration Statement or the Prospectus, as amended or supplemented,
          or any further amendment or supplement thereto made by the Guarantor
          or the Designated Trust prior to the Time of Delivery (other than the
          financial statements and related financial information and schedules
          therein, as to

                                     -25-

 
          which such counsel need express no opinion) contains an untrue
          statement of a material fact or omits to state a material fact
          necessary in order to make the statements therein, in light of the
          circumstances in which they were made, not misleading; and such
          counsel does not know of any amendment to any Registration Statement
          required to be filed or any contracts or other documents of a
          character required to be filed as an exhibit to any Registration
          Statement or required to be incorporated by reference into the
          Prospectus, as amended or supplemented, or required to be described in
          any Registration Statement or the Prospectus, as amended or
          supplemented, which are not filed or incorporated by reference or
          described as required;

          (e) Richards, Layton & Finger, special Delaware counsel to the
     Designated Trust and the Guarantor, shall have furnished to you, the
     Guarantor and the Designated Trust their written opinion, dated the
     respective Time of Delivery, in form and substance satisfactory to you, to
     the effect that:

               (i) The Designated Trust has been duly created and is validly
          existing as a business trust in good standing under the Delaware
          Business Trust Act and, under the Trust Agreement and the Delaware
          Business Trust Act, has the trust power and authority to own its
          properties and conduct its business, all as described in the
          Prospectus, and all filings required under the laws of the State of
          Delaware with respect to the creation and valid existence of the
          Designated Trust as a business trust have been made;

               (ii) The Trust Agreement constitutes a valid and binding
          obligation of the Guarantor and the Trustees, and is enforceable
          against the Guarantor and the Trustees, in accordance with its terms,
          and the terms of the Designated Securities as set forth in the Trust
          Agreement are valid and binding obligations of the Designated Trust in
          accordance with the terms of the Trust Agreement, all subject to the
          effect upon the Trust Agreement of (a) bankruptcy, insolvency,
          moratorium, receivership, reorganization, liquidation, fraudulent
          conveyance

                                     -26-

 
          or transfer and other similar laws relating to or affecting the rights
          and remedies of creditors generally, (b) principles of equity,
          including applicable law relating to fiduciary duties (regardless of
          whether considered and applied in a proceeding in equity or at law),
          and (c) the effect of applicable public policy on the enforceability
          of provisions relating to indemnification or contribution;

               (iii) Under the Trust Agreement and the Delaware Business Trust
          Act, the Designated Trust has the trust power and authority to (a)
          execute and deliver this Agreement and the Pricing Agreement and to
          perform its obligations under this Agreement and the Pricing
          Agreement, and (b) issue and perform its obligations under the
          Designated Securities and the Common Securities;

               (iv) Under the Trust Agreement and the Delaware Business Trust
          Act, the execution and delivery by the Designated Trust of this
          Agreement and the Pricing Agreement and the performance by the
          Designated Trust of its obligations hereunder and thereunder have been
          duly authorized by all necessary trust action on the part of the
          Designated Trust;

               (v) The Designated Securities have been duly and validly
          authorized by the Trust Agreement, and, when issued and delivered
          against payment therefor as provided herein, will be duly and validly
          issued and, subject to the qualifications set forth herein, fully paid
          and non-assessable undivided beneficial interests in the assets of the
          Designated Trust; under the Trust Agreement and the Delaware Business
          Trust Act, the issuance of the Designated Securities is not subject to
          preemptive or other similar rights; the Designated Securities will
          have the rights set forth in the Trust Agreement (subject to the terms
          of the Trust Agreement); the Securityholders, as beneficial owners of
          the Designated Trust, will be entitled to the same limitation of
          personal liability extended to stockholders of private corporations
          for profit organized under the General Corporation Law of the State of
          Delaware; provided that such

                                     -27-

 
          counsel may note that the Securityholders may be obligated, pursuant
          to the Trust Agreement, to (a) provide indemnity and/or security in
          connection with and pay taxes or governmental charges arising from
          transfers or exchanges of Preferred Securities Certificates (as
          defined in the Trust Agreement) and the issuance of replacement
          Preferred Securities Certificates and (b) provide security and
          indemnity in connection with requests of or directions to the Property
          Trustee (as defined in the Trust Agreement) to exercise its rights and
          remedies under the Trust Agreement;

               (vi) The Common Securities of the Designated Trust and the
          Expense Agreement have been duly and validly authorized by the Trust
          Agreement; under the Trust Agreement and the Delaware Business Trust
          Act, the issuance of the Common Securities is not subject to
          preemptive or other similar rights;

               (vii) The issue and sale of the Designated Securities and the
          Common Securities by the Designated Trust, the execution and delivery
          of this Agreement by the Designated Trust, the compliance by the
          Designated Trust with all of the provisions of the Designated
          Securities, the Trust Agreement, this Agreement and the Pricing
          Agreement, the purchase by the Designated Trust of the Subordinated
          Debentures and the consummation of the transactions herein and therein
          contemplated do not violate (a) the Trust Agreement or the Certificate
          of Trust of the Designated Trust or (b) any applicable Delaware law,
          rule or regulation;

               (viii) No authorization, approval, consent or order of any
          Delaware court or Delaware governmental authority or Delaware agency
          is required to be obtained by the Designated Trust solely in
          connection with the issuance and sale of the Designated Securities and
          the Common Securities; and

               (ix) Assuming that the Designated Trust derives no income from
          or connected with sources

                                     -28-

 
          within the State of Delaware and has no assets, activities (other than
          having a Delaware trustee as required by the Delaware Business Trust
          Act and filing documents with the Delaware Secretary of State) or
          employees in the State of Delaware and that the Designated Trust is
          treated as a grantor trust for United States federal income tax
          purposes, the Securityholders (other than those holders of the
          Designated Securities who reside or are domiciled in the State of
          Delaware) will have no liability for income taxes imposed by the State
          of Delaware solely as a result of their participation in the
          Designated Trust, and the Designated Trust will not be liable for any
          income tax imposed by the State of Delaware.

          In giving such opinion, Richards, Layton & Finger may rely, as to all
     matters governed by the laws of jurisdictions in which such counsel is not
     qualified, upon opinions of other counsel, who shall be counsel
     satisfactory to counsel for the Representatives, in which case the opinion
     shall state that they believe you and they are entitled to rely on such
     opinions.

          (f)  Schiff Hardin & Waite, tax counsel for the Designated Trust and
     the Guarantor, shall have furnished to you their written opinion, dated the
     respective Time of Delivery, in form and substance satisfactory to you, to
     the effect that such firm confirms its opinion set forth in the Prospectus
     under the caption "Certain Federal Income Tax Consequences";

          (g)  At the respective Time of Delivery for such Designated
     Securities, and, if so specified in the Pricing Agreement, on the date of
     the Pricing Agreement, Arthur Andersen LLP, the independent accountants of
     the Guarantor who have certified the financial statements of the Guarantor
     and its subsidiaries included or incorporated by reference in the Initial
     Registration Statement and any Rule 462(b) Registration Statement, shall
     have furnished to the Representatives a letter, dated such Time of Delivery
     and, if applicable, such date of the Pricing Agreement, respectively, to
     the effect set forth in Annex II hereto, and with respect to such letter
     dated such Time of Delivery, as to such other matters as the

                                     -29-

 
     Representatives may reasonably request and in form and substance
     satisfactory to the Representatives;

          (h)  Since the respective dates as of which information is given in
     the Prospectus, as amended or supplemented, there shall not have been (i)
     any change in the capital stock (other than the Guarantor's purchase of
     treasury stock in connection with its buy back program and the issuance of
     stock upon the exercise of employee stock options, director stock awards,
     bonus stock awards and earn-outs of performance shares) or long-term debt
     in excess of $10 million of the Guarantor or any of its subsidiaries or
     (ii) any change, or any development involving a prospective change, in or
     affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Guarantor and its
     subsidiaries, in each case, otherwise than as set forth or contemplated in
     the Prospectus, as amended or supplemented, the effect of which, in any
     such case described in Clause (i) or (ii), is in the judgment of the
     Representatives so material and adverse as to make it impracticable or
     inadvisable to proceed with the offering or the delivery of the Designated
     Securities on the terms and in the manner contemplated in the Prospectus,
     as amended or supplemented;

          (i)  On or after the date hereof (i) no downgrading shall have
     occurred in the rating accorded the Guarantor's or the Bank's debt
     securities or preferred stock by any "nationally recognized statistical
     rating organization," as that term is defined by the Commission for
     purposes of Rule 436(g)(2) under the Act, and (ii) no such organization
     shall have publicly announced that it has under surveillance or review,
     with possible negative implications, its rating of any of the Guarantor's
     or the Bank's debt securities or preferred stock;

          (j)  On or after the date hereof, there shall not have occurred any of
     the following: (i) a suspension or material limitation in trading in
     securities generally on the New York Stock Exchange or the Nasdaq Stock
     Market; (ii) a suspension or material limitation in trading in the
     Guarantor's securities on the Nasdaq Stock Market; (iii) a general
     moratorium on commercial banking activities in Illinois or New York
     declared by

                                     -30-

 
     federal, Illinois or New York State authorities; or (iv) the outbreak or
     escalation of hostilities involving the United States or the declaration by
     the United States of a national emergency or war, if the effect of any such
     event specified in this clause (iv) in the judgment of the Representatives
     makes it impracticable or inadvisable to proceed with the offering or the
     delivery of the Designated Securities on the terms and in the manner
     contemplated by the Prospectus, as amended and supplemented;

          (k) If provided in the applicable Pricing Agreement, the Designated
     Securities to be sold by the Designated Trust at the respective Time of
     Delivery shall have been duly listed, subject to notice of issuance, on the
     Nasdaq Stock Market; and

          (l) The Designated Trust and the Guarantor shall have furnished or
     caused to be furnished to the Representatives at the respective Time of
     Delivery for the Designated Securities certificates of officers of the
     Designated Trust and the Guarantor satisfactory to the Representatives as
     to the accuracy of the representations and warranties of the Designated
     Trust and the Guarantor herein at and as of such Time of Delivery, as to
     the performance by the Designated Trust and the Guarantor of all of their
     obligations hereunder to be performed at or prior to such Time of Delivery,
     as to the matters set forth in subsections (a) and (h) of this Section and
     as to such other matters as the Representatives may reasonably request.

          7.  (a)  The Designated Trust and the Guarantor jointly and severally
     will indemnify and hold harmless each Underwriter against any losses,
     claims, damages or liabilities, joint or several, to which such Underwriter
     may become subject, under the Act or otherwise, insofar as such losses,
     claims, damages or liabilities (or actions in respect thereof) arise out of
     or are based upon an untrue statement or alleged untrue statement of a
     material fact contained in any Preliminary Prospectus, any preliminary
     prospectus supplement, any Registration Statement, the Prospectus, as
     amended or supplemented, and any other prospectus relating to any
     Designated Securities, or any amendment or supplement thereto, or arise out
     of or are based upon the omission or alleged omission to state therein

                                      -31-

 
     a material fact required to be stated therein or necessary to make the
     statements therein not misleading, and will reimburse each Underwriter for
     any legal or other expenses reasonably incurred by such Underwriter in
     connection with investigating or defending any such action or claim as such
     expenses are incurred; provided, however, that neither the Designated Trust
     nor the Guarantor shall be liable in any such case to the extent that any
     such loss, claim, damage or liability arises out of or is based upon an
     untrue statement or alleged untrue statement or omission or alleged
     omission made in any Preliminary Prospectus, any preliminary prospectus
     supplement, any Registration Statement, the Prospectus, as amended or
     supplemented, and any other prospectus relating to the Designated
     Securities, or any such amendment or supplement in reliance upon and in
     conformity with written information furnished to the Designated Trust or
     the Guarantor by any Underwriter of Designated Securities through the
     Representatives expressly for use in the Prospectus, as amended or
     supplemented, relating to such Securities.

          (b) Each Underwriter will indemnify and hold harmless the Designated
     Trust and the Guarantor against any losses, claims, damages or liabilities
     to which the Designated Trust or the Guarantor may become subject, under
     the Act or otherwise, insofar as such losses, claims, damages or
     liabilities (or actions in respect thereof) arise out of or are based upon
     an untrue statement or alleged untrue statement of a material fact
     contained in any Preliminary Prospectus, any preliminary prospectus
     supplement, any Registration Statement, the Prospectus, as amended or
     supplemented, and any other prospectus relating to the Securities, or any
     amendment or supplement thereto, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, in each case to the extent, but only to the extent, that such
     untrue statement or alleged untrue statement or omission or alleged
     omission was made in any Preliminary Prospectus, any preliminary prospectus
     supplement, any Registration Statement, the Prospectus, as amended or
     supplemented, and any other prospectus relating to the Securities, or any
     such amendment or supplement in reliance upon and in conformity with

                                     -32-

 
     written information furnished to the Designated Trust or the Guarantor by
     such Underwriter through the Representatives expressly for use therein; and
     will reimburse the Designated Trust or the Guarantor for any legal or other
     expenses reasonably incurred by the Designated Trust or the Guarantor in
     connection with investigating or defending any such action or claim as such
     expenses are incurred.

          (c) Promptly after receipt by an indemnified party under subsection
     (a) or (b) above of notice of the commencement of any action, such
     indemnified party will, if a claim in respect thereof is to be made against
     the indemnifying party under such subsection, notify the indemnifying party
     in writing of the commencement thereof; but the omission so to notify the
     indemnifying party shall not relieve it from any liability which it may
     have to any indemnified party otherwise than under such subsection. In any
     such proceeding, any indemnified party shall have the right to retain its
     own counsel, but the fees and expenses of such counsel shall be at the
     expense of such indemnified party unless (i) the indemnifying party and the
     indemnified party shall have mutually agreed to the retention of such
     counsel or (ii) the named parties to any such proceeding (including any
     impleaded parties) include both the indemnifying party and the indemnified
     party and representation of both parties by the same counsel would be
     inappropriate due to actual or potential differing interests between them.
     It is understood that the indemnifying party shall not, in connection with
     any proceeding or related proceedings in the same jurisdiction, be liable
     for the reasonable fees and expenses of more than one separate firm for all
     such indemnified parties. Such firm shall be designated in writing by the
     Representatives in the case of parties indemnified pursuant to subsection
     (a) above and by the Guarantor in the case of parties indemnified pursuant
     to subsection (b) above.

          (d) If the indemnification provided for in this Section 7 is
     unavailable to or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above in respect of any losses, claims, damages or
     liabilities (or actions in respect thereof) referred to therein, then each
     indemnifying party shall contribute to the amount paid or payable by such
     indemnified party

                                     -33-

 
     as a result of such losses, claims, damages or liabilities (or actions in
     respect thereof) in such proportion as is appropriate to reflect the
     relative benefits received by the Designated Trust and the Guarantor on the
     one hand and the Underwriters of the Designated Securities on the other
     from the offering of the Designated Securities to which such loss, claim,
     damage or liability (or action in respect thereof) relates. If, however,
     the allocation provided by the immediately preceding sentence is not
     permitted by applicable law or if the indemnified party failed to give the
     notice required under subsection (c) above, then each indemnifying party
     shall contribute to such amount paid or payable by such indemnified party
     in such proportion as is appropriate to reflect not only such relative
     benefits but also the relative fault of the Designated Trust and the
     Guarantor on the one hand and the Underwriters of the Designated Securities
     on the other in connection with the statements or omissions which resulted
     in such losses, claims, damages or liabilities (or actions in respect
     thereof), as well as any other relevant equitable considerations. The
     relative benefits received by the Designated Trust and the Guarantor on the
     one hand and such Underwriters on the other shall be deemed to be in the
     same proportion as the total net proceeds from such offering (before
     deducting expenses) received by the Designated Trust bear to the total
     compensation (before deducting expenses) received or realized by the
     Underwriters from the underwriting of the Designated Securities. The
     relative fault shall be determined by reference to, among other things,
     whether the untrue or alleged untrue statement of a material fact or the
     omission or alleged omission to state a material fact relates to
     information supplied by the Designated Trust and the Guarantor on the one
     hand or such Underwriters on the other and the parties' relative intent,
     knowledge, access to information and opportunity to correct or prevent such
     statement or omission. The Designated Trust, the Guarantor and the
     Underwriters agree that it would not be just and equitable if contribution
     pursuant to this subsection (d) were determined by pro rata allocation or
     by any other method of allocation (even if the Underwriters were treated as
     one entity for such purpose) which does not take account of the equitable
     considerations referred to above in this subsection (d). The amount paid or
     payable by an

                                     -34-

 
     indemnified party as a result of the losses, claims, damages or liabilities
     (or actions in respect thereof) referred to above in this subsection (d)
     shall be deemed to include any legal or other expenses reasonably incurred
     by such indemnified party in connection with investigating or defending any
     such action or claim. Notwithstanding the provisions of this subsection
     (d), no Underwriter shall be required to contribute any amount in excess of
     the amount by which the total price at which the applicable Designated
     Securities underwritten by it and distributed to the public were offered to
     the public exceeds the amount of any damages which such Underwriter has
     otherwise been required to pay by reason of such untrue or alleged untrue
     statement or omission or alleged omission. No person guilty of fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Act) shall be
     entitled to contribution from any person who was not guilty of such
     fraudulent misrepresentation. The obligations of the Underwriters of
     Designated Securities in this subsection (d) to contribute are several in
     proportion to their respective underwriting obligations with respect to
     such Securities and not joint. For purposes of this Section 7, each person
     who controls an Underwriter within the meaning of the Act shall have the
     same rights to contribution as such Underwriter, and each person who
     controls the Guarantor or the Designated Trust within the meaning of the
     Act, and each director of the Guarantor and each administrative trustee of
     the Designated Trust, shall have the same rights to contribution as the
     Guarantor and the Designated Trust, subject in each case to the limitation
     described in the preceding sentence.

          (e)  The obligations of the Designated Trust and the Guarantor under
     this Section 7 shall be in addition to any liability which the Designated
     Trust and the Guarantor may otherwise have and shall extend, upon the same
     terms and conditions, to each person, if any, who controls any Underwriter
     within the meaning of the Act; and the obligations of the Underwriters
     under this Section 7 shall be in addition to any liability which the
     respective Underwriters may otherwise have and shall extend, upon the same
     terms and conditions, to each officer and director of the Guarantor, to
     each administrative trustee of the Designated Trust and to

                                     -35-

 
     each person, if any, who controls the Designated Trust or the Guarantor
     within the meaning of the Act.

          8.(a) If any Underwriter shall default in its obligation to purchase
     the Firm Designated Securities or the Optional Designated Securities which
     it has agreed to purchase under the Pricing Agreement relating to such
     Designated Securities, the Representatives may in their discretion arrange
     for themselves or another party or other parties to purchase such
     Designated Securities on the terms contained herein and in such Pricing
     Agreement. If within thirty-six hours after such default by any Underwriter
     the Representatives do not arrange for the purchase of such Firm Designated
     Securities or such Optional Designated Securities, as the case may be, then
     the Designated Trust and the Guarantor shall be entitled to a further
     period of thirty-six hours within which to procure another party or other
     parties satisfactory to the Representatives to purchase such Designated
     Securities on such terms. In the event that, within the respective
     prescribed period, the Representatives notify the Designated Trust and the
     Guarantor that they have so arranged for the purchase of such Designated
     Securities, or the Designated Trust and the Guarantor notifies the
     Representatives that they have so arranged for the purchase of such
     Designated Securities, the Representatives or the Designated Trust and the
     Guarantor shall have the right to postpone the Time of Delivery for such
     Designated Securities for a period of not more than seven days, in order to
     effect whatever changes may thereby be made necessary in any Registration
     Statement or the Prospectus, as amended or supplemented, or in any other
     documents or arrangements, and the Designated Trust and the Guarantor agree
     to file promptly any amendments or supplements to any Registration
     Statement or the Prospectus which in the opinion of the Representatives may
     thereby be made necessary. The term "Underwriter" as used in this Agreement
     shall include any person substituted under this Section with like effect as
     if such person had originally been a party to the Pricing Agreement with
     respect to such Designated Securities.

          (b)  If, after giving effect to any arrangements for the purchase of
     the Firm Designated Securities or Optional Designated Securities, as the
     case may be, of

                                     -36-
                  
 
     a defaulting Underwriter or Underwriters by the Representatives and the
     Designated Trust and the Guarantor as provided in subsection (a) above, the
     aggregate number of such Designated Securities which remains unpurchased
     does not exceed one-eleventh of the aggregate number of the Firm Designated
     Securities or Optional Designated Securities, as the case may be, to be
     purchased at the respective Time of Delivery, then the Designated Trust and
     the Guarantor shall have the right to require each non-defaulting
     Underwriter to purchase the number of Firm Designated Securities or
     Optional Designated Securities, as the case may be, which such Underwriter
     agreed to purchase under the Pricing Agreement relating to such Designated
     Securities and, in addition, to require each non-defaulting Underwriter to
     purchase its pro rata share (based on the number of Firm Designated
     Securities or Optional Designated Securities, as the case may be, which
     such Underwriter agreed to purchase under such Pricing Agreement) of the
     Firm Designated Securities or Optional Designated Securities, as the case
     may be, of such defaulting Underwriter or Underwriters for which such
     arrangements have not been made; but nothing herein shall relieve a
     defaulting Underwriter from liability for its default.

          (c) If, after giving effect to any arrangements for the purchase of
     the Firm Designated Securities or Optional Designated Securities, as the
     case may be, of a defaulting Underwriter or Underwriters by the
     Representatives and the Designated Trust and the Guarantor as provided in
     subsection (a) above, the aggregate number of Firm Designated Securities or
     Optional Designated Securities, as the case may be, which remains
     unpurchased exceeds one-eleventh of the aggregate number of the Firm
     Designated Securities or Optional Designated Securities, as the case may
     be, to be purchased at the respective Time of Delivery, as referred to in
     subsection (b) above, or if the Designated Trust and the Guarantor shall
     not exercise the right described in subsection (b) above to require non-
     defaulting Underwriters to purchase Firm Designated Securities or Optional
     Designated Securities, as the case may be, of a defaulting Underwriter or
     Underwriters, then the Pricing Agreement relating to such Firm Designated
     Securities or Optional Designated Securities, as the case may be, shall
     thereupon
                                      -37-

 
     terminate, without liability on the part of any non-defaulting Underwriter,
     the Designated Trust or the Guarantor, except for the expenses to be borne
     by the Designated Trust, the Guarantor and the Underwriters as provided in
     Section 5 hereof and the indemnity and contribution agreements in Section 7
     hereof; but nothing herein shall relieve a defaulting Underwriter from
     liability for its default.

        9.  The respective indemnities, agreements, representations, warranties
and other statements of the Designated Trust, the Guarantor and the several
Underwriters, as set forth in this Agreement or made by or on behalf of them,
respectively, pursuant to this Agreement, shall remain in full force and effect,
regardless of any investigation (or any statement as to the results thereof)
made by or on behalf of any Underwriter or any controlling person of any
Underwriter, or the Designated Trust, the Guarantor, or any officer or director
or controlling person of the Designated Trust or the Guarantor, and shall
survive delivery of and payment for the Designated Securities.

         10. If any Pricing Agreement or Over-allotment Option shall be
terminated pursuant to Section 8 hereof, neither the Designated Trust nor the
Guarantor shall then be under any liability to any Underwriter with respect to
the Firm Designated Securities or Optional Designated Securities covered by such
Pricing Agreement except as provided in Section 5 and Section 7 hereof; but, if
for any other reason, Designated Securities are not delivered by or on behalf of
the Designated Trust as provided herein, the Designated Trust and the Guarantor
will reimburse the Underwriters through the Representatives for all out-of-
pocket expenses approved in writing by the Representatives, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of such Designated Securities,
but the Designated Trust and the Guarantor shall then be under no further
liability to any Underwriter with respect to such Designated Securities except
as provided in Section 5 and Section 7 hereof.

        11. In all dealings hereunder, the Representatives of the Underwriters
of Designated Securities shall act on behalf of each of such Underwriters, and
the parties hereto shall be entitled to act and rely upon any statement,
request, notice or agreement on behalf of any Underwriter 

                                     -38-

 
made or given by such Representatives jointly or by such of the Representatives,
if any, as may be designated for such purpose in the Pricing Agreement.

     All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to the address of the Representatives as set forth in the
Pricing Agreement; and if to the Designated Trust or the Guarantor shall be
delivered or sent by mail, telex or facsimile transmission to the address of the
Designated Trust or the Guarantor set forth in the Initial Registration
Statement: Attention: Corporate Secretary, with a copy to Northern Trust
Corporation, Fifty South LaSalle Street, Chicago, Illinois 60675, Attention:
General Counsel, Facsimile Transmission No. (312) 630-1596; provided, however,
that any notice to an Underwriter pursuant to Section 7(c) hereof shall be
delivered or sent by mail, telex or facsimile transmission to such Underwriter
at its address set forth in its Underwriters' Questionnaire, or telex
constituting such Questionnaire, which address will be supplied to the
Designated Trust and the Guarantor by the Representatives upon request. Any such
statements, requests, notices or agreements shall take effect upon receipt
thereof.

     12. This Agreement and each Pricing Agreement shall be binding upon, and
inure solely to the benefit of, the Underwriters, the Designated Trust and the
Guarantor and, to the extent provided in Section 7 and Section 9 hereof, the
officers and directors of the Designated Trust or the Guarantor and each person
who controls the Designated Trust, the Guarantor or any Underwriter, and their
respective heirs, executors, administrators, successors and assigns, and no
other person shall acquire or have any right under or by virtue of this
Agreement or any such Pricing Agreement. No purchaser of any of the Designated
Securities from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

     13. Time shall be of the essence of each Pricing Agreement. As used herein,
"business day" shall mean any day when the Commission's office in Washington,
D.C. is open for business.

                                      -39-

 
     14. This Agreement and each Pricing Agreement shall be governed by and
construed in accordance with the laws of the State of New York.

     15. This Agreement and each Pricing Agreement may be executed by any one or
more of the parties hereto and thereto in any number of counterparts, each of
which shall be deemed to be an original, but all such respective counterparts
shall together constitute one and the same instrument.

                                      -40-

 
     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof.

                                       Very truly yours,

                                       NORTHERN TRUST CORPORATION

                                       By:                         
                                          -----------------------------------
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice
                                                 President and Chief
                                                 Financial Officer

                                       NTC CAPITAL I
                                       By:  Northern Trust Corporation,   
                                              as Depositor

                                       By:
                                          -----------------------------------
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice
                                                 President and Chief
                                                 Financial Officer

                                       NTC CAPITAL II
                                       By:  Northern Trust Corporation,
                                              as Depositor

                                       By:
                                          -----------------------------------
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice
                                                 President and Chief
                                                 Financial Officer

                                       NTC CAPITAL III
                                       By:  Northern Trust Corporation,
                                              as Depositor

                                       By:
                                          -----------------------------------
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice
                                                 President and Chief
                                                 Financial Officer

                                     -41-

 
Accepted on behalf of ourselves and the other Underwriters listed in Schedule I
to the Pricing Agreement:

Salomon Brothers Inc
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated

By:  Salomon Brothers Inc


By: 
   --------------------------------
   Name:
   Title:

On behalf of each of the Underwriters

                                      -42-

 
                                                                         ANNEX I


                               Pricing Agreement
                               -----------------


Salomon Brothers Inc,
Merrill Lynch, Pierce, Fenner & Smith
  Incorporated,
 [As Representatives of the several
   Underwriters named in Schedule I hereto,]
c/o Salomon Brothers Inc,
Seven World Trade Center,
New York, New York 10048.

                                                              _________ __, ____

Dear Sirs:

     NTC Capital ___, a statutory business trust created under the laws of the
State of Delaware (the "Designated Trust"), and Northern Trust Corporation, a
Delaware corporation (the "Guarantor"), propose, subject to the terms and
conditions stated herein and in the Underwriting Agreement, dated April 22, 1997
(the "Underwriting Agreement"), among the Guarantor and the Designated Trust on
the one hand and the Underwriters named in Schedule I to the Underwriting
Agreement, on the other hand, to issue and sell to the Underwriters named in
Schedule I hereto (the "Underwriters") the Securities specified in Schedule II
hereto (the "Designated Securities", consisting of Firm Designated Securities
and any Optional Designated Securities the Underwriters may elect to purchase).
Each of the provisions of the Underwriting Agreement is incorporated herein by
reference in its entirety, and shall be deemed to be a part of this Agreement to
the same extent as if such provisions had been set forth in full herein; and
each of the representations and warranties set forth therein shall be deemed to
have been made at and as of the date of this Pricing Agreement, except that each
representation and warranty which refers to the Prospectus in Section 2 of the
Underwriting Agreement shall be deemed to be a representation or warranty as of
the date of the Underwriting Agreement in relation to the Prospectus (as therein
defined), and also a representation and warranty as of the date of this Pricing
Agreement in relation to the Prospectus, as amended or supplemented,

                                     -43-

 
relating to the Designated Securities which are the subject of this Pricing
Agreement. Each reference to the Representatives herein and in the provisions of
the Underwriting Agreement so incorporated by reference shall be deemed to refer
to you. Unless otherwise defined herein, terms defined in the Underwriting
Agreement are used herein as therein defined. Any Representatives designated to
act on behalf of the Representatives and on behalf of each of the Underwriters
of the Designated Securities pursuant to Section 11 of the Underwriting
Agreement and the address of the Representatives referred to in such Section 11,
if any, are set forth at the end of Schedule II hereto.

     An amendment to the Initial Registration Statement, a Rule 462(b)
Registration Statement or a supplement to the Prospectus, as the case may be,
relating to the Designated Securities, in the form heretofore delivered to you
is now proposed to be filed with the Commission.

     Subject to the terms and conditions set forth herein and in the
Underwriting Agreement incorporated herein by reference, (a) the Designated
Trust agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Designated
Trust, at the time and place and at the purchase price to the Underwriters set
forth in Schedule II hereto, the number of Firm Designated Securities set forth
opposite the name of such Underwriter in Schedule I hereto, and (b) in the event
and to the extent that the Underwriters shall exercise the election to purchase
Optional Designated Securities, as provided below, the Designated Trust agrees
to issue and sell to each of the Underwriters, and each of the Underwriters
agrees, severally and not jointly, to purchase from the Designated Trust at the
purchase price to the Underwriters set out in Schedule II hereto that portion of
the number of Optional Designated Securities as to which such election shall
have been exercised.

     The Designated Trust hereby grants to each of the Underwriters the right to
purchase at their election up to the number of Optional Designated Securities
set forth opposite the name of such Underwriter in Schedule I hereto on the
terms referred to in the paragraph above for the sole purpose of covering over-
allotments in the sale of the Firm Designated Securities. Any such election to
purchase Optional Designated Securities may be exercised by written

                                     -44-

 
notice from the Representatives to the Designated Trust and the Guarantor given
within a period of 30 calendar days after the date of this Pricing Agreement,
setting forth the aggregate number of Optional Designated Securities to be
purchased and the date on which such Optional Designated Securities are to be
delivered, as determined by the Underwriters, but in no event earlier than the
First Time of Delivery or, unless the Underwriters, the Guarantor and the
Designated Trust otherwise agree in writing, no earlier than two or later than
ten business days after the date of such notice.

     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof, and upon acceptance hereof by you, on
behalf of each of the Underwriters, this letter and such acceptance hereof,
including the provisions of the Underwriting Agreement incorporated herein by
reference, shall constitute a binding agreement between each of the
Underwriters, the Designated Trust and the Guarantor. It is understood that your
acceptance of this letter on behalf of each of the Underwriters is or will be
pursuant to the authority set forth in a form of Agreement among Underwriters,
the form of which shall be submitted to the Guarantor for examination upon
request, but without warranty on the part of the Underwriters as to the
authority of the signers thereof.

                                  Very truly yours,

                                  NORTHERN TRUST CORPORATION


                                  By:
                                     -------------------------
                                     Name:
                                     Title:



                                  NTC CAPITAL _____
                                  By: Northern Trust Corporation,
                                  as Depositor


                                  By:
                                     -------------------------
                                     Name:
                                     Title:

                                      -45-
                         

 
Accepted as of the date hereof:


Salomon Brothers Inc
Merrill Lynch, Pierce, Fenner & Smith
  Incorporated

[As Representatives of the Underwriters
named in Schedule I hereto]

By:  Salomon Brothers Inc


By:
   ------------------------
   Name:
   Title:


On behalf of each of the Underwriters
named on Schedule I hereto

                                     -46-

 
SCHEDULE I


 
 
                                                         Number of 
                                                          Maximum
                               Number of Firm             Optional
                                  Designated             Designated
                               Securities to be         Securities to 
Underwriter                       Purchased             be Purchased
- -----------                    ----------------        --------------
                                                  
[Names of Underwriters] ...

Total









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

                               ================        ==============

 
                                     -47-

 
                                  SCHEDULE II

Designated Trust:

     NTC Capital __

Title of Designated Securities:

     ___% Preferred Securities, Series ___

Aggregate principal amount:

     Aggregate principal amount of Firm Designated Securities:
     $_________________________

     Maximum aggregate principal amount of Optional Designated Securities:
     $_________________________

Price to Public

     ______% of the principal amount of the Designated Securities

Purchase Price by Underwriters:

     ______% of the principal amount of the Designated Securities

Underwriters' Compensation:

     $_____ per Designated Security

Specified funds for payment of purchase price:

     New York Clearing House same-day funds

Accountants' Letter to be delivered on date of Pricing Agreement:

     Yes.

Trust Agreement:

     Amended and Restated Trust Agreement dated __________________, among the
     Guarantor, the Trustees named therein and the holders from time to time of
     undivided beneficial interests of the Designated Trust.

                                     -48-

 
Indenture:

     Junior Subordinated Indenture dated as of January 1, 1997, between the
     Guarantor and The First National Bank of Chicago, as Debenture Trustee (the
     "Indenture")

Guarantee:

     Guarantee Agreement, dated as of _________________, between Guarantor and
     Guarantee Trustee

Maturity:


Interest Rate:

     _____%

Interest Payment Dates:


Extension Period:

     [20 quarters]

Redemption Provisions:

     [The redemption provisions set forth in Section 4.2 of the Trust Agreement
     shall apply to the Designated Securities.]

Sinking Fund Provisions:

     No sinking fund provisions.

[First] Time of Delivery:

     10:00 a.m., New York City time _______ ___, ____

Closing Location:

     Sullivan & Cromwell
     125 Broad Street
     New York, New York  10004

                                     -49-

 
[Names and addresses of Representatives:]

                                      -50-

 
                                                                        ANNEX II


                              Accountants' Letter
                              -------------------


     Pursuant to Section 6(g) of the Underwriting Agreement, the Guarantor's
independent certified public accountants shall furnish letters to the effect
that:

          (i)  they are independent certified public accountants with respect to
     the Guarantor and its subsidiaries within the meaning of the Act and the
     applicable published rules and regulations thereunder;

          (ii) in their opinion, the financial statements and any supplementary
     financial information and schedules (and, if applicable, prospective
     financial statements and/or pro forma financial information) examined by
     them and included or incorporated by reference in any Registration
     Statement or the Prospectus comply as to form in all material respects with
     the applicable accounting requirements of the Act or the Exchange Act, as
     applicable, and the related published rules and regulations thereunder;
     and, if reasonably requested by the Representatives, they have made a
     review in accordance with standards established by the American Institute
     of Certified Public Accountants of the unaudited consolidated interim
     financial statements, selected financial data, pro forma financial
     information, prospective financial statements and/or condensed financial
     statements derived from audited financial statements of the Guarantor for
     the periods specified in such letter, as indicated in their reports
     thereon, copies of which have been furnished to the representatives of the
     Underwriters (the "Representatives");

          (iii) they have made a review in accordance with standards established
     by the American Institute of Certified Public Accountants of the unaudited
     condensed consolidated statements of income, consolidated balance sheets
     and consolidated statements of cash flows included in the Prospectus and/or
     included in the Guarantor's quarterly reports on Form 10-Q incorporated by
     reference into the Prospectus as indicated in their reports thereon copies
     of which have been separately

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     furnished to the Representatives; and on the basis of specified procedures
     including inquiries of officials of the Guarantor who have responsibility
     for financial and accounting matters regarding whether the unaudited
     condensed consolidated financial statements referred to in paragraph (v)(A)
     below comply as to form in all material respects with the applicable
     accounting requirements of the Act and the Exchange Act and the related
     published rules and regulations, nothing came to their attention that
     caused them to believe that the unaudited condensed consolidated financial
     statements do not comply as to form in all material respects with the
     applicable accounting requirements of the Act and the Exchange Act and the
     related published rules and regulations;

          (iv) the unaudited selected financial information with respect to the
     consolidated results of operations and financial position of the Guarantor
     for the five most recent fiscal years included in the Prospectus and
     included or incorporated by reference in Item 2 of the Guarantor's
     Registration Statement on Form 10 or Item 6 of the Guarantor's Annual
     Report on Form 10-K for the most recent fiscal year, as applicable, agrees
     with the corresponding amounts (after restatement where applicable) in the
     audited consolidated financial statements for the five such fiscal years
     which were included or incorporated by reference in the Guarantor's
     Registration Statement on Form 10 or the Guarantor's Annual Reports on Form
     10-K for such fiscal years, as applicable;

          (v) on the basis of limited procedures, not constituting an
     examination in accordance with generally accepted auditing standards,
     consisting of a reading of the unaudited financial statements and other
     information referred to below, a reading of the latest available interim
     financial statements of the Guarantor and its subsidiaries, inspection of
     the minute books of the Guarantor and its subsidiaries since the date of
     the latest audited financial statements included or incorporated by
     reference in the Prospectus, inquiries of officials of the Guarantor and
     its subsidiaries responsible for financial accounting matters and such
     other inquiries and procedures as may be specified in such letter, nothing
     came to their attention that caused them to believe that:

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               (A) the unaudited condensed consolidated statements of income,
          consolidated balance sheets and consolidated statements of cash flows
          included or incorporated by reference in the Guarantor's Quarterly
          Reports on Form 10-Q incorporated by reference in the Prospectus (if
          any) do not comply as to form in all material respects with the
          applicable accounting requirements of the Exchange Act as it applies
          to Form 10-Q and the related published rules and regulations
          thereunder or are not in conformity with generally accepted accounting
          principles applied on a basis substantially consistent with the basis
          for the audited consolidated statements of income, consolidated
          balance sheets and consolidated statements of cash flows included or
          incorporated by reference in the Guarantor's Registration Statement on
          Form 10 or the Guarantor's Annual Report on Form 10-K for the most
          recent fiscal year, as applicable;

               (B) any other unaudited income statement data and balance sheet
          items included in the Prospectus do not agree with the corresponding
          items in the unaudited consolidated financial statements from which
          such data and items were derived, and any such unaudited data and
          items were not determined on a basis substantially consistent with the
          basis for the corresponding amounts in the audited consolidated
          financial statements included or incorporated by reference in the
          Guarantor's Registration Statement on Form 10 or the Guarantor's
          Annual Report on Form 10-K for the most recent fiscal year, as
          applicable;

               (C)  the unaudited financial statements which were not included
          in the Prospectus but from which were derived the unaudited condensed
          financial statements referred to in Clause (A) and any unaudited
          income statement data and balance sheet items included in the
          Prospectus and referred to in Clause (B) were not determined on a
          basis substantially consistent with the basis for the audited
          financial statements included or incorporated by reference in the
          Guarantor's Registration Statement on Form 10 or the

                                     -53-

 
          Guarantor's Annual Report on Form 10-K for the most recent fiscal
          year, as applicable;

               (D)  any unaudited pro forma consolidated condensed financial
          statements included or incorporated by reference in the Prospectus do
          not comply as to form in all material respects with the applicable
          accounting requirements of the Act and the published rules and
          regulations thereunder or the pro forma adjustments have not been
          properly applied to the historical amounts in the compilation of those
          statements;

               (E)  as of a specified date not more than five days prior to the
          date of such letter, there have been any changes in the consolidated
          capital stock (other than the Guarantor's purchase of treasury stock
          in connection with its buy back program and the issuance of stock upon
          the exercise of employee stock options, director stock awards, bonus
          stock awards and earn-outs of performance shares) or any increase in
          the consolidated long-term debt of the Guarantor and its subsidiaries
          or any decreases in total assets, in each case as compared with
          amounts shown in the latest balance sheet included or incorporated by
          reference in the Prospectus, except in each case for changes,
          increases or decreases which the Prospectus discloses have occurred or
          may occur or which are described in such letter; and

               (F)  for the period from the date of the latest financial
          statements included or incorporated by reference in the Prospectus to
          the specified date referred to in Clause (E) there were any decreases
          in consolidated net interest income, non-interest income or the total
          or per share amounts of consolidated net income, in each case as
          compared with the comparable period of the preceding year and with any
          other period of corresponding length specified by the Representatives,
          except in each case for increases or decreases which the Prospectus
          discloses have occurred or may occur or which are described in such
          letter; and

                                     -54-

 
          (vi) in addition to the examination referred to in their report(s)
     included or incorporated by reference in the Prospectus and the limited
     procedures, inspection of minute books, inquiries and other procedures
     referred to in paragraphs (iii) and (v) above, they have carried out
     certain specified procedures, not constituting an examination in accordance
     with generally accepted auditing standards, with respect to certain
     amounts, percentages and financial information specified by the
     Representatives which are derived from the general accounting records of
     the Guarantor and its subsidiaries, which appear in the Prospectus
     (excluding documents incorporated by reference), or in Part II of, or in
     exhibits and schedules to, any Registration Statement specified by the
     Representatives or in documents incorporated by reference in the Prospectus
     specified by the Representatives, and have compared certain of such
     amounts, percentages and financial information with the accounting records
     of the Guarantor and its subsidiaries and have found them to be in
     agreement.

          All references in this Annex II to the Prospectus shall be deemed to
refer to the Prospectus (including the documents incorporated by reference
therein) as defined in the Underwriting Agreement as of the date of the letter
delivered on the date of the Pricing Agreement, if so delivered, for purposes of
such letter and to the Prospectus, as amended or supplemented, (including the
documents incorporated by reference therein) in relation to the applicable
Designated Securities for purposes of the letter delivered at the Time of
Delivery for such Designated Securities.

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