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                                                              EXHIBIT 10.17

                                 May 3, 2000

R. William Ide III, Esq.
Monsanto Company
800 North Lindbergh Boulevard
St. Louis, MO 63167

Dear Bill:

         The purpose of this letter is to memorialize certain determinations
made by the People Committee of the Board of Directors ("Committee") of
Monsanto Company, now known as Pharmacia Corporation ("Company"), at its
October 23, 1997 meeting. The Committee reviewed the retirement benefits
made available to you under the Monsanto Company Pension Plan ("Pension
Plan"), the Monsanto Company ERISA Parity Pension Plan ("Parity Pension
Plan"), and the Monsanto Company Supplemental Retirement Plan ("Supplemental
Plan"). In recognition of the experience and expertise you have brought to
the Company and your potential service with the Company, the Committee
determined to award you, subject to certain conditions, a "Supplemental
Retirement Benefit" designed to produce a total retirement benefit from the
Company at age 65 comparable to that which a Company employee with 30 years
of service would receive (taking into account the value of any pension
benefits earned as an active employee of the Company and pension benefits
received from prior employers). The value of Supplemental Retirement Benefit
will be credited to a notional bookkeeping account (the "SERP Account") and
will be equal to:

         (a)      Three times the sum of the Contribution Credits that would
                  have been credited to you under the Pension Plan had the
                  cash balance plan formula in the Pension Plan been in
                  effect as of the date of your employment, such amount to
                  be credited to you under the terms of the Pension Plan and
                  the Parity Pension Plan as in effect as of January 1, 1997
                  with respect to your Compensation between the date of your
                  employment with the Company and December 31, 1997; plus
                                                                     ----
         (b)      Three times the sum of the Contribution Credits credited
                  to you under the Pension Plan and the Parity Pension Plan
                  with respect to each calendar year during which you are
                  employed by the Company, commencing with calendar year
                  1997 and continuing through the calendar year in which you
                  attain age 65 or terminate employment with the Company,
                  whichever shall first occur; plus
                                               ----

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R. William Ide III, Esq.
May 2, 2000
Page 2

         (c)      Interest on your SERP Account balance credited as of the
                  first day of each month during which you are employed by
                  the Company at a rate equal to the "Interest Rate" as
                  defined in the Pension Plan.

         The balance of your SERP Account from time to time shall be deemed
to your "Supplemental Retirement Benefit." Except as specifically provided
below, you will be fully vested in your Supplemental Retirement Benefit at
all times.

         The optional payment form you elect under the Parity Pension Plan
will also apply to payment of your Supplemental Retirement Benefit, using
the same actuarial factors as are used under the Parity Pension Plan.
Interest will be credited to your Supplemental Retirement Benefit beginning
as of the date of your termination of employment and ending as of the date
payment of the benefit commences at the same rate as provided under the
Parity Pension Plan.

         If you die while employed by the Company or any of its affiliates,
are married, and your spouse survives you, she will be entitled to receive a
survivor's benefit in an amount equal to the value of your Supplemental
Retirement Benefit at the time of your death. Your spouse may elect to have
such amount paid in any manner available to a beneficiary under the Parity
Pension Plan.

         You may request deferral of the payment of your Supplemental
Retirement Benefit if you submit a timely request prior to termination of
employment in accordance with the deferral procedures set forth in the
Parity Pension Plan. The Committee will consider your deferral request, and
if it is approved, you will be permitted to defer payment of your
Supplemental Retirement Benefit on the same terms and conditions as
permitted with respect to your benefit under the Parity Pension Plan.

         This Supplemental Retirement Benefit will be separate from and in
addition to any pension benefit you are entitled to receive under the
Pension Plan, Parity Pension Plan and Supplemental Plan.

         The Supplemental Retirement Benefit may not be assigned by you, and
any attempted assignment, pledge or other transfer shall be void. If any
court, agency, or other party orders or is otherwise successful in obtaining
an order for transfer in whole or in part of the Supplemental Retirement
Benefit, it shall thereupon be deemed automatically terminated in full.

         The Supplemental Retirement Benefit and the Company's obligations
hereunder may be terminated in whole or in part at any time by the Committee
(or its successor) if, after your employment with the Company, any of its
affiliates, or the assignee of this agreement ends, you become employed by
or are retained in any manner by an agricultural, pharmaceutical or other
company in competition with any of the companies.

         Any term capitalized but not defined herein shall have the meaning
assigned to it in the Pension Plan. To the extent necessary, the Pension
Plan and the Parity Pension Plan are incorporated by reference herein and
made a part hereof.

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R. William Ide III, Esq.
May 2, 2000
Page 3

         Please acknowledge your receipt and acceptance of this agreement by
signing both copies of this letter and returning one copy to my office.

                                          Very truly yours,

                                          PHARMACIA CORPORATION

                                          By /s/ John Murabito
                                             -----------------

                                          Its VP, Ag HR    5/12/00

Received and Acknowledged:

/s/ R. William Ide III
----------------------
R. William Ide III

Date: May 3, 2000
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                                                                 EXHIBIT 10.19

                                            Monsanto

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

                                            Monsanto Company
RICHARD J. MAHONEY                          800 N. Lindbergh Boulevard
Chairman and                                St. Louis, Missouri 63167
Chief Executive Officer                     Phone: (314) 694-3756

                                                   April 22, 1994

Mr. Steven L. Engelberg
Monsanto Company
Suite 1100
700 14th Street
Washington, D.C. 20005

Dear Steve:

It is my pleasure to advise you that the Executive Compensation and
Development Committee of the Board ("ECDC") at its October 21, 1993 meeting,
reviewed the retirement benefits which will be available to you under the
Company's Salaried Employees' Pension Plan ("Pension Plan") and the Monsanto
ERISA Parity Pension Plan ("Parity Pension Plan"). In recognition of the
experience and expertise which you have brought to the Company, and in
recognition of your potential service with the Company, the ECDC has
determined to award you, subject to certain conditions, a Supplemental
Retirement Benefit equal to 45% of your "Average Total Earnings," as defined
in the Pension Plan, less (i) the benefit you will receive from the Monsanto
Pension and Pension Parity Plans and (ii) the benefit you would receive from
two-thirds of $702,843 increased by 8.5% interest compounded annually per
year from January 1, 1993 to the date of your retirement. Conversion of this
lump sum to an annuity will be based on the lump sum conversion factors in
the pension plan. Your account balances in the Monsanto Savings and
Investment Plan and the Monsanto Company ERISA Parity Savings and Investment
Plan will not be included as an offset. Except as specifically provided
below, the Supplemental Retirement Benefit will not be payable unless you
accrue at least ten years of vesting service with Monsanto. Any optional
payment form you elect under the Parity Pension Plan will also apply to the
Supplemental Retirement Benefit, using the same actuarial factors as are
used under the Pension Plan.

If you die while employed by Monsanto, are married, and your spouse
survives you, she will be entitled to receive a sur-

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                                     -2-

vivor's benefit equal to 50% of this Supplemental Retirement Benefit. Her
Supplemental Retirement Benefit would be paid for the remainder of her life.

If you involuntarily terminate employment without cause for reasons beyond
your control after five years of employment and there has been no Change of
Control of the Company, the Supplemental Retirement Benefit payable to you
will be prorated as follows:

         a.       Your Supplemental Retirement Benefit will be calculated as
                  described above but assuming you remained employed until
                  your tenth employment anniversary. For this calculation, a
                  5% annual salary increase will be assumed in determining
                  your Average Total Earnings and the amount of the Pension
                  Plan and Parity Pension Plan offsets.

         b.       Your benefit will be prorated 20% for each year of
                  employment, beginning after your fifth employment
                  anniversary until the full benefit is payable after ten
                  years of employment.

If you Terminate Employment with the Company after a Change of Control of
the Company, your Supplemental Retirement Benefit will be an amount equal to
45% of your Average Total Earnings calculated in the same way it is
calculated in subparagraph "a" above, less the offsets described in the
first paragraph of this agreement with the result then multiplied by a
fraction, the numerator of which is your actual years of Vesting Service and
denominator of which is ten. The terms "Change of Control" and "Terminate
Employment" have the same meanings they do in your Key Executive Employment
Agreement, which, to the extent necessary, is incorporated by reference
herein and made a part hereof.

If you choose to do so, you may request deferral of your Supplemental
Retirement Benefit if you make a timely request before retirement. The terms
and conditions of this deferral option are described in Attachment A, which
is hereby incorporated in this Agreement.

This Supplemental Retirement Benefit will be separate from and in addition
to any pension benefit which you are entitled to receive under the Company's
Pension Plan and the Parity Pension Plan.

This Supplemental Retirement Benefit may be terminated in whole or in part
at any time by the ECDC if, after your Monsanto employment ends, you become
employed by or be retained

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in any manner by a chemical, pharmaceutical or other company in competition
with Monsanto.

This Supplemental Retirement Benefit may not be assigned by you, and any
attempted assignment, pledge or other transfer shall be void. If any court,
agency, or other party orders or is otherwise successful in obtaining an
order for transfer in whole or in part of the Supplemental Retirement
Benefit, it shall thereupon be deemed automatically terminated in full.

I am pleased to be able to offer this Supplemental Retirement Benefit on
behalf of the Company. Please acknowledge your receipt and acceptance of
this agreement by signing and returning one copy to my office.

                                            Very truly yours,

                                            MONSANTO COMPANY

                                            By  /s/ Richard J. Mahoney
                                              ------------------------
                                                 Richard J. Mahoney

Received and Acknowledged:

/s/ Steven L. Engelberg
-----------------------
Steven L. Engelberg

Date:  June 1, 1994
     --------------

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                                                                  Attachment A

                             STEVEN L. ENGELBERG

                  SUPPLEMENTAL RETIREMENT BENEFIT AGREEMENT

Supplemental Retirement Benefit Deferral Option
-----------------------------------------------

You may request deferral of your Supplemental Retirement Benefit if you
submit a timely request at least six months prior to retirement. The
Employee Benefits Plans Committee will consider your deferral request, and
if it is approved, you will be permitted to defer payment of your
Supplemental Retirement Benefit on the same terms and conditions as
permitted under the ERISA Pension Parity Plan ("Parity Plan"). For this
reason, the terms and conditions of the Parity Plan are incorporated by
reference herein and made a part of this Agreement.

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