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                                                                   EXHIBIT 10(I)
 
                           SHELL DEVELOPMENT COMPANY
                        A DIVISION OF SHELL OIL COMPANY
 
ONE SHELL PLAZA
P. O. BOX 2463
HOUSTON, TEXAS 77252-2463
 
L. L. SMITH
VICE PRESIDENT
SAFETY, ENVIRONMENT & TECHNOLOGY
SHELL OIL COMPANY
 
                                                              Our Ref: STVP LGVP
 
Shell Internationale Research Maatschappij, B. V.
P. O. Box 162
30 Carel van Bylandtlaan
The Hague 2076, The Netherlands
 
SUBJECT: AGREEMENT FOR RESEARCH SERVICES
 
Gentlemen:
 
This refers to the Agreement dated January 1, 1960, between our companies
entitled "Agreement for Research Services," as amended.
 
Programs and budget for the year 1995 having been exchanged in accordance with
paragraph 9 of said Agreement, and the parties having agreed to the factors
referred to in subparagraph 10 (c) (iii), we now wish to confirm our
understanding with you that said Agreement, as amended, shall be continued for
the calendar year 1995, with the amount of the monthly payment to be determined
and paid according to the terms of said Agreement.
 
Please indicate your concurrence to the continuation of the said Agreement on
the basis indicated above by executing both of the executed letters enclosed and
returning one of them to us and retaining the other for your files.
 
                                          Yours very truly,
 
                                          SHELL OIL COMPANY
 
                                          By        /s/ L. L. Smith
                                             ------------------------------
                                                        L. L. Smith
 
Accepted and Agreed to:
 
                    The Hague, 13 December, 1994
 
Shell Internationale Research Maatschappij, B. V.
 
                    By    /s/  J. R. Street             /s/  C. T. Leenders
                       ------------------------     ---------------------------
                               J. R. Street                  C. T. Leenders
 
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