CO-ADMINISTRATION AGREEMENT Credit Suisse Asset Management Securities, Inc. 466 Lexington Avenue New York, New York 10017-3147 Dear Sirs: In accordance with Section 7 of the Co-Administration Agreement, dated November 1, 1999 (the "Agreement"),...

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                           CO-ADMINISTRATION AGREEMENT

                             _____________ __, 2000




Credit Suisse Asset Management
 Securities, Inc.
000 Xxxxxxxxx Xxxxxx
Xxx Xxxx, Xxx Xxxx  00000-0000

Dear Sirs:

         In accordance with Section 7 of the Co-Administration Agreement, dated
November 1, 1999 (the "Agreement"), between Warburg, Xxxxxx Institutional Fund,
Inc., the prior name of Credit Suisse Institutional Fund, Inc. (the "Fund"), and
Credit Suisse Asset Management Securities, Inc. ("CSAMSI"), the Fund hereby
notifies CSAMSI of the Fund's desire to amend Exhibit A of the Agreement to
include the Investment Grade Fixed Income Portfolio(the "Portfolio"), and to
have CSAMSI render services as Co-Administrator under the terms of the Agreement
with respect to the Portfolio.

         Please confirm that the foregoing is in accordance with your
understanding by indicating your acceptance hereof at the place below indicated,
whereupon it shall become a binding agreement between us.

                                           Very truly yours,

                                           CREDIT SUISSE INSTITUTIONAL
                                           FUND, INC.



                                           By:
                                               -------------------------------

                                                   Name:
                                                   Title:



Acceptance:

CREDIT SUISSE ASSET MANAGEMENT
SECURITIES, INC.




By:
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         Name:
         Title: