EXHIBIT 25.6
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                   FORM T-1
                                   --------

                           STATEMENT OF ELIGIBILITY
                     UNDER THE TRUST INDENTURE ACT OF 1939
                 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

               CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY
                  OF A TRUSTEE PURSUANT TO SECTION 305(b)(2)

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

                      THE FIRST NATIONAL BANK OF CHICAGO
              (Exact name of trustee as specified in its charter)

         A National Banking Association                   36-0899825
                                                          (I.R.S. employer
                                                          identification number)

         One First National Plaza, Chicago, Illinois      60670-0126
         (Address of principal executive offices)         (Zip Code)

                      The First National Bank of Chicago
                     One First National Plaza, Suite 0286
                         Chicago, Illinois 60670-0286
            Attn: Lynn A. Goldstein, Law Department (312) 732-6919
           (Name, address and telephone number of agent for service)

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

                           State Street Corporation
              (Exact name of obligor as specified in its charter)

         Massachusetts                                    04-2456637
         (State or other jurisdiction of                  (I.R.S. employer
         incorporation or organization)                   identification number)


         225 Franklin Street
         Boston, Massachusetts                            02110
         (Address of principal executive offices)         (Zip Code)


                        Guarantee of Capital Securities
                           of State Street Capital I
                        (Title of Indenture Securities)

 
Item 1.      General Information.  Furnish the following
             --------------------
             information as to the trustee:

             (a)   Name and address of each examining or
             supervising authority to which it is subject.

             Comptroller of Currency, Washington, D.C., Federal Deposit
             Insurance Corporation, Washington, D.C., The Board of
             Governors of the Federal Reserve System, Washington D.C.

             (b)   Whether it is authorized to exercise
             corporate trust powers.

             The trustee is authorized to exercise corporate trust powers.

Item 2.      Affiliations With the Obligor.  If the obligor
             ------------------------------
             is an affiliate of the trustee, describe each
             such affiliation.

             No such affiliation exists with the trustee.


Item 16.     List of exhibits. List below all exhibits filed as a part
             -----------------
             of this Statement of Eligibility.

             1.  A copy of the articles of association of the
                 trustee now in effect.*

             2.  A copy of the certificates of authority of the
                 trustee to commence business.*

             3.  A copy of the authorization of the trustee to
                 exercise corporate trust powers.*

             4.  A copy of the existing by-laws of the trustee.*

             5.  Not Applicable.

             6.  The consent of the trustee required by
                 Section 321(b) of the Act.

             7.  A copy of the latest report of condition of the
                 trustee published pursuant to law or the
                 requirements of its supervising or examining
                 authority.

 
             8.  Not Applicable.

             9.  Not Applicable.


         Pursuant to the requirements of the Trust Indenture Act of 1939, as
amended, the trustee, The First National Bank of Chicago, a national banking
association organized and existing under the laws of the United States of
America, has duly caused this Statement of Eligibility to be signed on its
behalf by the undersigned, thereunto duly authorized, all in the City of Chicago
and the State of Illinois, on this 25th day of March, 1998.


                 The First National Bank of Chicago,
                 Trustee

                 By  /s/ John R. Prendiville
                   -----------------------------
                         John R. Prendiville
                         Vice President


* Exhibit 1, 2, 3 and 4 are herein incorporated by reference to Exhibits bearing
identical numbers in Item 16 of the Form T-1 of The First National Bank of
Chicago, filed as Exhibit 25.1 to the Registration Statement on Form S-3 of
SunAmerica, Inc., filed with the Securities and Exchange Commission on October
25, 1996 (Registration No. 333-14201).

 
                                   EXHIBIT 6



                      THE CONSENT OF THE TRUSTEE REQUIRED
                         BY SECTION 321(b) OF THE ACT

                                                                 March 25, 1998

Securities and Exchange Commission
Washington, D.C.  20549

Gentlemen:

           In connection with the qualification of a guarantee between
State Street Corporation and The First National Bank of Chicago, the
undersigned, in accordance with Section 321(b) of the Trust Indenture Act of
1939, as amended, hereby consents that the reports of examinations of the
undersigned, made by Federal or State authorities authorized to make such
examinations, may be furnished by such authorities to the Securities and
Exchange Commission upon its request therefor.


                  Very truly yours,

                  The First National Bank of Chicago

                  By  /s/ John R. Prendiville
                    --------------------------------
                          John R. Prendiville
                          Vice President

 
 
 
      
                                   EXHIBIT 7
                                                                       
Legal Title of Bank:                The First National Bank of Chicago       Call Date: 12/31/97  ST-BK:  17-1630 FFIEC 031
Address:                            One First National Plaza, Ste 0303                                         Page RC-1      
City, State  Zip:                   Chicago, IL  60670
FDIC Certificate No.:      0/3/6/1/8
                           ---------
 



Consolidated Report of Condition for Insured Commercial
and State-Chartered Savings Banks for December 31,1997

All schedules are to be reported in thousands of dollars. Unless otherwise
indicated, report the amount outstanding as of the last business day of the
quarter.

Schedule RC--Balance Sheet




ASSETS
                                                              Dollar Amounts in                      C400
                                                                                                   --------  

                                                                                                                 
1.  Cash and balances due from depository institutions (from Schedule RC-A):
    a. Noninterest-bearing balances and currency and coin(1)                                     0081      4,267,336         1.a.
    b. Interest-bearing balances(2)                                                              0071      6,893,837         1.b.
2.  Securities
    a. Held-to-maturity securities(from Schedule RC-B, column A)                                 1754              0         2.a.
    b. Available-for-sale securities (from Schedule RC-B, column D)....                          1773      5,691,722         2.b.
3.  Federal funds sold and securities purchased under agreements to
    resell                                                                                       1350      6,339,940         3.
4.  Loans and lease financing receivables:
    a. Loans and leases, net of unearned income (from Schedule RC-C)   RCFD 2122 25,202,984                                  4.a.
    b. LESS: Allowance for loan and lease losses                       RCFD 3123    419,121                                  4.b.
    c. LESS: Allocated transfer risk reserve                           RCFD 3128          0                                  4.c.
    d. Loans and leases, net of unearned income, allowance, and
       reserve (item 4.a minus 4.b and 4.c)                                                      2125     24,783,863         4.d.
5.  Trading assets (from Schedule RD-D)                                                          3545      6,703,332         5.
6.  Premises and fixed assets (including capitalized leases)                                     2145        743,426         6.
7.  Other real estate owned (from Schedule RC-M)                                                 2150          7,727         7.
8.  Investments in unconsolidated subsidiaries and associated
    companies (from Schedule RC-M)                                                               2130        134,959         8.
9.  Customers' liability to this bank on acceptances outstanding                                 2155        644,340         9.
10. Intangible assets (from Schedule RC-M)                                                       2143        268,501         10.
11. Other assets (from Schedule RC-F)                                                            2160      2,004,432         11.
12. Total assets (sum of items 1 through 11)                                                     2170     58,483,415         12.

- -------------
(1)  Includes cash items in process of collection and unposted debits.
(2)  Includes time certificates of deposit not held for trading.

 
 
                                                                     
Legal Title of Bank:                The First National Bank of Chicago    Call Date:  09/30/97 ST-BK:  17-1630 FFIEC 031 
Address:                            One First National Plaza, Ste 0303                                             Page RC-2      
City, State  Zip:                   Chicago, IL  60670
FDIC Certificate No.:               0/3/6/1/8
                                    ---------
 
                                 
                                                                      
 
 

Schedule RC-Continued
                                                                        Dollar Amounts in
                                                                           Thousands                      Bil Mil Thou
- ------------------------------------------------------------------------------------------------------------------------------------

LIABILITIES
                                                                                                                
13. Deposits:
    a. In domestic offices (sum of totals of columns A and C
       from Schedule RC-E, part 1)                                                              RCON 2200     21,756,846    13.a
       (1) Noninterest-bearing(1)                                      RCON 6631  9,197,227                                 13.a.1
       (2) Interest-bearing                                            RCON 6636    559,619                                 13.a.2
    b. In foreign offices, Edge and Agreement subsidiaries, and
       IBFs (from Schedule RC-E, part II)                                                       RCFN 2200     14,811,410    13.b.
       (1) Noninterest bearing                                         RCFN 6631    332,801                                 13.b.1
       (2) Interest-bearing                                            RCFN 6636 14,478,609                                 13.b.2
14. Federal funds purchased and securities sold under agreements
    to repurchase:                                                                              RCFD 2800      4,535,422    14
15. a. Demand notes issued to the U.S. Treasury                                                 RCON 2840         43,763    15.a
    b. Trading Liabilities(from Schedule RC-D).........................                         RCFD 3548      6,523,239    15.b
16. Other borrowed money:
    a. With a remaining  maturity of one year or less                                           RCFD 2332      1,360,165    16.a
    b. With a remaining  maturity of than one year through three years                          A547             576,492    16.b
    c.  With a remaining maturity of more than three years ............                         A548             703,981    16.c
17. Not applicable
18. Bank's liability on acceptance executed and outstanding                                     RCFD 2920        644,341    18
19. Subordinated notes and debentures (2)                                                       RCFD 3200      1,700,000    19
20. Other liabilities (from Schedule RC-G)                                                      RCFD 2930      1,322,077    20
21. Total liabilities (sum of items 13 through 20)                                              RCFD 2948     53,987,736    21
22. Not applicable
EQUITY CAPITAL
23. Perpetual preferred stock and related surplus                                               RCFD 3838              0    23
24. Common stock                                                                                RCFD 3230        200,858    24
25. Surplus (exclude all surplus related to preferred stock)                                    RCFD 3839      2,999,001    25
26. a. Undivided profits and capital reserves                                                   RCFD 3632      1,273,239    26.a.
    b. Net unrealized holding gains (losses) on available-for-sale
       securities                                                                               RCFD 8434         24,096    26.b.
27. Cumulative foreign currency translation adjustments                                         RCFD 3284         (1,515)   27
28. Total equity capital (sum of items 23 through 27)                                           RCFD 3210      4,495,679    28
29. Total liabilities and equity capital (sum of items 21 and 28)                               RCFD 3300     58,483,415    29


Memorandum
To be reported only with the March Report of Condition.
1.  Indicate in the box at the right the number of the statement 
    below that best describes the most comprehensive level of auditing 
    work performed for the bank by independent external         Number
    auditors as of any date during 1996........RCFD 6724........N/A          M.1
1 =  Independent audit of the bank conducted in accordance         
     with generally accepted auditing standards by a certified     
     public accounting firm which submits a report on the bank     
2 = Independent audit of the bank's parent holding company         
     conducted in accordance with generally accepted auditing      
     standards by a certified public accounting firm which         
     submits a report on the consolidated holding company          
     (but not on the bank separately)                              
3 = Directors' examination of the bank conducted in                
     accordance with generally accepted auditing standards 
     by a certified public accounting firm (may be required by 
     state chartering authority)
4 = Directors' examination of the bank performed by other
     external auditors (may be required by state chartering
     authority)
5 = Review of the bank's financial statements by external
     auditors
6 = Compilation of the bank's financial statements by external
     auditors
7 = Other audit procedures (excluding tax preparation work)
8 = No external audit work
- --------------------
(1) Includes total demand deposits and noninterest-bearing time 
    and savings deposits.
(2) Includes limited-life preferred stock and related surplus.