MONSANTO CO
S-4/A, 1999-07-28
CHEMICALS & ALLIED PRODUCTS
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<PAGE>


  As Filed with the Securities and Exchange Commission on July 28, 1999
                                                     Registration No. 333-73233
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                             AMENDMENT NO. 2
                                      TO

                                   FORM S-4
                            REGISTRATION STATEMENT
                                     Under
                          The Securities Act of 1933

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

                               MONSANTO COMPANY
            (Exact name of Registrant as specified in its charter)

               Delaware                              43-0420020
    (State or other jurisdiction of     (I.R.S. Employer Identification No.)
    incorporation or organization)

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

                         800 North Lindbergh Boulevard
                           St. Louis, Missouri 63167
                                (314) 694-1000
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive office)

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

                           R. William Ide III, Esq.
                               Monsanto Company
                         800 North Lindbergh Boulevard
                           St. Louis, Missouri 63167
                                (314) 694-1000
(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                  Copies to:
         Barbara L. Blackford                      Robert F. Wall
          Sonya Meyers Davis                      Terrence R. Brady
           Monsanto Company                       Winston & Strawn
     800 North Lindbergh Boulevard              35 West Wacker Drive
       St. Louis, Missouri 63167               Chicago, Illinois 60601
            (314) 694-1000                         (312) 558-5600

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

  Approximate Date of Commencement of Proposed Sale to Public: As soon as
practicable after this Registration Statement becomes effective.

  If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance
with General Instruction G, check the following box: [_]

  If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering: [_]

  If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering: [_]

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

  The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this
Registration Statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until this Registration
Statement shall become effective on such date as the Commission, acting
pursuant to said Section 8(a), may determine.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>


                SUBJECT TO COMPLETION, DATED JULY 28, 1999

PROSPECTUS

[Monsanto logo]

                                Monsanto Company

                               Exchange Offer for

                       $500,000,000 5.375% Notes due 2001
                       $600,000,000 5.750% Notes due 2005
                       $200,000,000 5.875% Notes due 2008
                    $500,000,000 6.500% Debentures due 2018
                    $700,000,000 6.600% Debentures due 2028

                          Terms of the Exchange Offer

  .  The exchange offer expires at 5:00 p.m., New York City time, on      ,
     1999, unless Monosanto, in its sole discretion, extends the exchange
     offer to allow additional tenders of outstanding notes and debentures.

  .  All outstanding notes and debentures that are validly tendered and not
     validly withdrawn will be exchanged.

  .  Tenders of outstanding notes and debentures may be withdrawn at any time
     prior to the expiration of the exchange offer.

  .  The exchange offer is not subject to any condition, other than that the
     exchange offer not violate applicable law or any applicable
     interpretation of the staff of the Securities and Exchange Commission.

  .  Monsanto will not receive any proceeds from the exchange offer.

  .  The exchange of notes and debentures will not be a taxable exchange for
     U.S. federal income tax purposes.

  .  The terms of the registered notes and debentures and the outstanding
     notes and debentures are substantially identical, except that the
     outstanding notes and debentures are subject to transfer restrictions
     and have registration rights.

  .  There is no existing market for the registered notes and debentures, and
     Monsanto does not intend to apply for their listing on any securities
     exchange.

   For a discussion of some factors that you should consider before tendering
your outstanding notes and debentures in the exchange offer, see "Risk Factors"
on page 7.

   Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is
a criminal offense.

   The information in this prospectus is not complete and may be changed.
Monsanto may not sell these securities until the registration statement filed
with the Securities and Exchange Commission is effective. This prospectus is
not an offer to sell these securities and it is not soliciting an offer to buy
these securities in any state where the offer or sale is not permitted.

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

                 The date of this Prospectus is         , 1999.
<PAGE>

   Each broker-dealer that receives registered debt for its own account
pursuant to the exchange offer must acknowledge that it will deliver a
prospectus in connection with any resale of such registered debt. Each letter
of transmittal states that by so acknowledging and by delivering a prospectus,
a broker-dealer will not be deemed to admit that it is an "underwriter" within
the meaning of the Securities Act. This prospectus, as it may be amended or
supplemented from time to time, may be used by a broker-dealer in connection
with resales of registered debt received in exchange for outstanding debt
acquired by such broker-dealer as a result of market-making activities or other
trading activities. Monsanto has agreed that, ending on the close of business
on the 180th day following the expiration date of the exchange offer, it will
make this prospectus available to any broker-dealer for use in connection with
any such resale. See "Plan of Distribution."

   You should rely on the information contained, or incorporated by reference,
in this prospectus. Monsanto has not authorized anyone to provide you with
different information. Monsanto is not making an offer of these securities in
any state where the offer is not permitted. You should not assume that the
information contained in this prospectus is accurate as of any date other than
the date on the front cover of this prospectus.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Prospectus Summary.........................................................   1
Risk Factors...............................................................   7
Use of Proceeds............................................................   8
The Exchange Offer.........................................................   9
Description of the Registered Debt.........................................  17
United States Federal Tax Consequences.....................................  27
Plan of Distribution.......................................................  29
Where You Can Find More Information........................................  30
Incorporation of Certain Documents by Reference............................  30
Validity of the Registered Debt............................................  31
Experts....................................................................  31
</TABLE>

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

   Trademarks and service marks owned or licensed by Monsanto and its
subsidiaries are indicated by special type throughout this prospectus.
<PAGE>

                               PROSPECTUS SUMMARY

   The following summary is qualified in its entirety by reference to the more
detailed information and consolidated financial information appearing elsewhere
in or incorporated by reference into this prospectus.

                                  The Company

   Monsanto is a life sciences company, committed to finding solutions to the
growing global needs for food and health by applying common forms of science
and technology among agriculture, nutrition and health. Monsanto makes,
researches and markets high-value agricultural products, pharmaceuticals and
nutrition-based health products.

   Monsanto was incorporated in 1933 under Delaware law and is the successor to
a Missouri corporation, Monsanto Chemical Works, organized in 1901. Monsanto's
principal executive offices are located at 800 North Lindbergh Boulevard, St.
Louis, Missouri 63167 (telephone number (314) 694-1000) and its internet
address is http://www.monsanto.com.

                         Purpose of the Exchange Offer

   On December 9, 1998, Monsanto sold, through a private placement exempt from
the registration requirements of the Securities Act of 1933, $500 million of
its 5.375% Notes due 2001, $600 million of its 5.750% Notes due 2005, $200
million of its 5.875% Notes due 2008, $500 million of its 6.500% Debentures due
2018 and $700 million of its 6.600% Debentures due 2028. We refer to these five
series of outstanding notes and debentures as "outstanding debt" in this
prospectus. Monsanto used the net proceeds from the sale of the outstanding
debt to finance or refinance seed company acquisitions, including to refinance
its outstanding commercial paper as it became due, and for working capital
purposes. Pending use for the foregoing purposes, Monsanto invested the
proceeds in short-term investment grade marketable securities or money market
obligations.

   Simultaneously with the private placement, Monsanto entered into a
registration rights agreement with the initial purchasers of the outstanding
debt. Under the registration rights agreement, Monsanto was required to use its
reasonable efforts to cause a registration statement for substantially
identical notes and debentures, to be issued in exchange for the outstanding
debt, to become effective on or before June 7, 1999. We refer to the notes and
debentures to be registered under this exchange offer registration statement as
"registered debt" in this prospectus. The registration rights agreement
requires Monsanto to pay liquidated damages to the holders of outstanding debt
from June 8, 1999 until it consummates the exchange offer. You may exchange
your outstanding debt for registered debt in this exchange offer. You should
read the discussion under the heading "Summary of Terms of the Registered Debt"
and "Description of the Registered Debt" for further information regarding the
registered debt.

   Monsanto did not register the outstanding debt under the Securities Act or
any state securities laws, nor does it intend to after the exchange offer. As a
result, the outstanding debt may only be transferred in limited circumstances
under the securities laws. If the holders of the outstanding debt do not
exchange their notes and debentures in the exchange offer, they lose their
right to have the outstanding debt registered under the Securities Act, subject
to certain limitations. Anyone who still holds outstanding debt after the
exchange offer may be unable to resell such notes and debentures.

   However, Monsanto believes that holders of the outstanding debt may resell
the registered debt without complying with the registration and prospectus
delivery provisions of the Securities Act, if they meet certain

                                       1
<PAGE>

conditions. You should read the discussion under the headings "Summary of the
Exchange Offer" and "The Exchange Offer" for further information regarding the
exchange offer and resales of the registered debt.

                         Summary of the Exchange Offer

Registration Rights.......  Monsanto sold the outstanding debt on December 9,
                            1998 to Salomon Smith Barney Inc. and Goldman,
                            Sachs & Co., the initial purchasers. The initial
                            purchasers then sold the outstanding debt to
                            institutional investors. Simultaneously with the
                            initial sale of the outstanding debt, Monsanto
                            entered into a registration rights agreement with
                            the initial purchasers, which provides for the
                            exchange offer.

                            You may exchange your outstanding debt for
                            registered debt, which has substantially identical
                            terms. The exchange offer satisfies your rights
                            under the registration rights agreement. After the
                            exchange offer is over, you will not be entitled to
                            any exchange or registration rights with respect to
                            your outstanding debt. Therefore, if you do not
                            exchange your outstanding debt, you will not be
                            able to reoffer, resell or otherwise dispose of
                            your outstanding debt unless (1) you comply with
                            the registration and prospectus delivery
                            requirements of the Securities Act, or (2) you are
                            exempt from such Securities Act requirements.

The Exchange Offer........  Monsanto is offering to exchange $500 million total
                            principal amount of its 5.375% Notes due 2001, $600
                            million total principal amount of its 5.750% Notes
                            due 2005, $200 million total principal amount of
                            its 5.875% Notes due 2008, $500 million total
                            principal amount of its 6.500% Debentures due 2018
                            and $700 million total principal amount of its
                            6.600% Debentures due 2028, which have been
                            registered under the Securities Act, for,
                            respectively, your outstanding 5.375% Notes due
                            2001, 5.750% Notes due 2005, 5.875% Notes due 2008,
                            6.500% Debentures due 2018 or 6.600% Debentures due
                            2028 sold in the December 1998 private offering. To
                            exchange your outstanding debt, you must properly
                            tender it, and Monsanto must accept it. Monsanto
                            will exchange all outstanding debt that you validly
                            tender and do not validly withdraw. Monsanto will
                            issue registered debt at or promptly after the end
                            of the exchange offer.

Resales...................  Monsanto believes that you can offer for resale,
                            resell or otherwise transfer the registered debt
                            without complying with the registration and
                            prospectus delivery requirements of the Securities
                            Act if:

                               .  you acquire the registered debt in the
                                  ordinary course of your business;

                               .  you are not participating, do not intend to
                                  participate, and have no arrangement or
                                  understanding with any person to
                                  participate, in the distribution of the
                                  registered debt; and

                               .  you are not an "affiliate" of Monsanto, as
                                  defined in Rule 405 of the Securities Act.

                                       2
<PAGE>


                            If any of these conditions is not satisfied and you
                            transfer any registered debt without delivering a
                            proper prospectus or without qualifying for a
                            registration exemption, you may incur liability
                            under the Securities Act. Monsanto will not assume
                            or indemnify you against such liability.

                            Each broker-dealer that receives registered debt
                            for its own account in exchange for outstanding
                            debt, where such outstanding debt was acquired by
                            such broker-dealer as a result of market-making
                            activities or other trading activities, must
                            acknowledge that it will deliver a prospectus in
                            connection with any resale of such registered debt.
                            See "Plan of Distribution." A broker-dealer may use
                            this prospectus for an offer to resell, a resale or
                            other retransfer of the registered debt.

Expiration Date...........  The exchange offer expires at 5:00 p.m., New York
                            City time, on           , 1999, unless Monsanto, in
                            its sole discretion, extends the exchange offer to
                            allow additional tenders of outstanding debt.

Liquidated Damages........  Under the registration rights agreement, Monsanto
                            is required to pay liquidated damages to the
                            holders of outstanding debt from June 8, 1999,
                            until it consummates the exchange offer.

Conditions to the
 Exchange Offer...........  The exchange offer is subject to conditions, some
                            of which Monsanto may waive. Such conditions are
                            more fully described later in this prospectus under
                            "The Exchange Offer--Conditions to the Exchange
                            Offer."

Procedures for Tendering
 Outstanding Debt.........  Monsanto issued the outstanding debt as global
                            securities. When the outstanding debt was issued,
                            Monsanto deposited it with The Bank of New York, as
                            depositary. The Bank of New York established a
                            certificateless depositary interest in each note
                            and debenture, which represents a 100% interest in
                            the notes and debentures, in the name of Cede &
                            Co., the nominee of The Depository Trust Company,
                            commonly known as "DTC". Beneficial interests in
                            the outstanding debt, which are held by direct or
                            indirect participants in DTC through the
                            certificateless depositary interest, are shown on
                            records maintained in book-entry form by DTC.

                            You may tender your outstanding debt through book-
                            entry transfer in accordance with DTC's Automated
                            Tender Offer Program, or "ATOP". To tender your
                            outstanding debt by a means other than ATOP, a
                            letter of transmittal must be completed and signed
                            according to the instructions contained in such
                            letter. The letter of transmittal and any other
                            documents required by the letter of transmittal
                            must be delivered to the exchange agent by mail,
                            facsimile, hand delivery or overnight carrier. In
                            addition, you must deliver your outstanding debt to
                            the exchange agent or comply with the procedures
                            for guaranteed delivery. See "The Exchange Offer--
                            Procedures for Tendering Outstanding Debt" for more
                            information.

                                       3
<PAGE>


                            Do not send letters of transmittal and certificates
                            representing outstanding debt, if any, to Monsanto.
                            Send these documents only to the exchange agent.
                            See "The Exchange Offer--Exchange Agent" for more
                            information.

Special Procedures for
 Beneficial Owners........  If you are a beneficial owner whose outstanding
                            debt is registered in the name of a broker, dealer,
                            commercial bank, trust company or other nominee,
                            and you wish to tender your outstanding debt in the
                            exchange offer, please contact the registered
                            holder as soon as possible and instruct them to
                            tender on your behalf and comply with the
                            instructions set forth elsewhere in this
                            prospectus.

Withdrawal Rights.........  You may withdraw the tender of your outstanding
                            debt at any time before 5:00 p.m., New York City
                            time, on           , 1999, unless Monsanto extends
                            the date.

Appraisal or Dissenters'
 Rights...................  Holders of outstanding debt do not have any
                            appraisal or dissenters' rights in the exchange
                            offer. If you do not tender your outstanding debt
                            or Monsanto does not accept your tender because,
                            among other things, you invalidly tendered it, you
                            will not be entitled to any further registration
                            rights under the registration rights agreement,
                            except under limited circumstances. However, your
                            notes and debentures will remain outstanding and
                            entitled to the benefits of the indenture.

Federal Income Tax
 Considerations...........  The exchange of outstanding notes and debentures is
                            not a taxable exchange for United States federal
                            income tax purposes. You will not recognize any
                            taxable gain or loss or any interest income as a
                            result of the exchange. For additional information
                            regarding federal income tax considerations, you
                            should read the discussion under the heading
                            "United States Federal Tax Consequences."

Use of Proceeds...........  Monsanto will not receive any proceeds from the
                            issuance of the registered debt, and Monsanto will
                            pay the expenses of the exchange offer.

Exchange Agent............  The Bank of New York is serving as exchange agent
                            in the exchange offer. The mailing address of the
                            exchange agent is The Bank of New York, 101 Barclay
                            Street, 7E, New York, New York 10286, Attention:
                            Reorganization Department. Deliveries by hand or
                            overnight courier should be addressed to The Bank
                            of New York, 101 Barclay Street, 7E, Corporate
                            Trust Services Window, Ground Level, New York, New
                            York 10286, Attention: Reorganization Department.
                            For information about the exchange offer, call the
                            exchange agent at telephone number: (212) 815-6333
                            or facsimile number: (212) 815-4699.

                                       4
<PAGE>


                    Summary of Terms of the Registered Debt

   The form and terms of the registered debt are the same as the form and terms
of the outstanding debt, except that the registered debt will be registered
under the Securities Act. As a result, the registered debt will not bear
legends restricting its transfer and will not contain the registration rights
and liquidated damages provisions contained in the outstanding debt. The
registered debt represents the same debt as the outstanding debt. Both the
outstanding debt and the registered debt are governed by the same indenture.

Aggregate Amount..........  $500,000,000 principal amount of 5.375% Notes due
                            2001, $600,000,000 principal amount of 5.750% Notes
                            due 2005, $200,000,000 principal amount of 5.875%
                            Notes due 2008, $500,000,000 principal amount of
                            6.500% Debentures due 2018, and $700,000,000
                            principal amount of 6.600% Debentures due 2028.


Interest..................  Interest will accrue on the registered debt from
                            the date of initial issuance and will be payable on
                            June 1 and December 1 of each year, beginning
                            December 1, 1999. Holders of registered debt will
                            receive interest on December 1, 1999 from the date
                            of initial issuance of the registered debt, plus an
                            amount equal to the accrued, but unpaid, interest
                            on the outstanding debt.

Ranking...................  The registered debt will be senior unsecured
                            obligations of Monsanto and will rank equally with
                            all other senior unsecured and unsubordinated
                            indebtedness of Monsanto.

Optional Redemption.......  The Notes due 2001 are not redeemable prior to
                            maturity. The other series of registered debt will
                            be redeemable as a whole or in part, at the option
                            of Monsanto, at any time at a redemption price
                            equal to the greater of (1) 100% of the principal
                            amount of the registered debt to be redeemed or (2)
                            the sum of the present values of the remaining
                            scheduled principal and interest payments
                            discounted, on a semiannual basis, at a rate equal
                            to the sum of the applicable Treasury Rate (as
                            defined herein) and 15 basis points for the Notes
                            due 2005, 20 basis points for the Notes due 2008
                            and the Debentures due 2018, and 25 basis points
                            for the Debentures due 2028, plus, in each case,
                            accrued interest to the date of redemption.

Sinking Fund..............  None.

Use of Proceeds...........  Monsanto will not receive any cash proceeds in the
                            exchange offer.

Form of the Registered
 Debt.....................  The registered debt will be represented by one or
                            more permanent global securities in bearer form
                            deposited with The Bank of New York, as book-entry
                            depositary, for the benefit of DTC. You will not
                            receive notes or debentures in registered form
                            unless one of the events set forth under the
                            heading "Description of the Registered Debt--Global
                            Securities" and "--Certificated Securities" occurs.
                            Instead, beneficial interests in the registered
                            debt will be shown on, and transfers of these
                            interests will be effected only through, records
                            maintained in book-entry form by DTC with respect
                            to its participants.

Absence of a Public
 Market for the
 Registered Debt..........  Monsanto does not intend to apply for a listing of
                            the registered debt on any securities exchange. The
                            initial purchasers of the outstanding debt have
                            advised Monsanto that they currently intend to make
                            a

                                       5
<PAGE>

                            market in the registered debt following the
                            exchange offer, but they are not obligated to do
                            so, and any market-making may be stopped at any
                            time without notice. Monsanto does not know if an
                            active public market for the registered notes and
                            debentures will develop or, if developed, will
                            continue. If an active public market does not
                            develop or is not maintained, the market price and
                            liquidity of the registered notes and debentures
                            may be adversely affected. Monsanto cannot make any
                            assurances regarding the liquidity of the market
                            for such registered debt, the ability of holders to
                            sell their registered debt or the price at which
                            holders may sell their registered debt.

   For additional information regarding the registered debt, see "Description
of the Registered Debt."

                                Other Offerings

   In addition to the Monsanto's private placement of the outstanding debt, in
November 1998 Monsanto completed offerings of common stock and adjustable
conversion-rate equity security units that resulted in aggregate net proceeds,
after deducting estimated expenses, of approximately $1.64 billion. This
prospectus relates only to the offering of registered debt and no other
securities.

                                       6
<PAGE>


                               RISK FACTORS

   Before making a decision to exchange your notes and debentures in the
exchange offer, you should consider, in addition to the information with
respect to Monsanto and its business contained in this prospectus or
incorporated in this prospectus by reference, the following risk factors
relating to the exchange offer.

Failure to Exchange Outstanding Debt for Registered Debt Limits Your Ability to
Sell or Transfer the Notes and Debentures

   Monsanto did not register the outstanding debt under the Securities Act or
any state securities laws, nor does it intend to after the exchange offer. As a
result, the outstanding debt may only be transferred in limited circumstances
under the securities laws. If the holders of the outstanding debt who are
eligible to participate in the exchange offer do not exchange their notes and
debentures in the exchange offer, they lose their right to have the outstanding
debt registered under the Securities Act. A holder of outstanding debt after
the exchange offer may be unable to sell the notes and debentures.

Lack of Public Market for Registered Debt May Limit its Liquidity

   Monsanto does not intend to apply for a listing of the registered debt on
any securities exchange. The initial purchasers of the outstanding debt have
advised Monsanto that they currently intend to make a market in the registered
debt following the exchange offer, but they are not obligated to do so, and
they may stop any market-making at any time without notice. Monsanto does not
know if an active public market for the registered debt will develop or, if
developed, will continue. If an active public market does not develop or is not
maintained, the market price and liquidity of the registered debt may be
adversely affected. Monsanto cannot make any assurances regarding the liquidity
of the market for the registered debt, the ability of holders to sell their
registered debt or the price at which holders may sell their registered debt.

                                       7
<PAGE>

                                USE OF PROCEEDS

   Monsanto will not receive any proceeds from the exchange offer. In
consideration for issuing the registered debt, Monsanto will receive in
exchange outstanding debt of like principal amount, the terms of which are
identical in all material respects to the registered debt. The outstanding debt
surrendered in exchange for registered debt will be retired and canceled and
cannot be reissued. Accordingly, issuance of the registered debt will not
result in any increase in Monsanto's indebtedness. Monsanto has agreed to bear
the expenses of the exchange offer. No underwriter is being used in connection
with the exchange offer.

   The net proceeds to Monsanto from the sale of the outstanding debt, after
deducting expenses, was approximately $2.475 billion. Monsanto used such net
proceeds to finance or refinance seed company acquisitions, including to
refinance its outstanding commercial paper as it became due, and for working
capital purposes.

                                       8
<PAGE>

                               THE EXCHANGE OFFER

Purpose of the Exchange Offer

   Simultaneously with the sale of the outstanding debt, Monsanto entered into
a registration rights agreement with Salomon Smith Barney Inc. and Goldman,
Sachs & Co., the initial purchasers of the outstanding debt. Under this
registration rights agreement, Monsanto agreed to file a registration statement
regarding the exchange of the outstanding debt for registered notes and
debentures with terms identical in all material respects. Monsanto also agreed
to use its reasonable best efforts to cause that registration statement to
become effective with the Securities and Exchange Commission. A copy of the
registration rights agreement has been filed as an exhibit to the registration
statement of which this prospectus is a part.

   Monsanto is conducting the exchange offer to satisfy its contractual
obligations under the registration rights agreement. The form and terms of the
registered debt are the same as the form and terms of the outstanding debt,
except that the registered debt will be registered under the Securities Act,
and holders of the registered debt will not be entitled to liquidated damages.
The registration rights agreement requires Monsanto to pay liquidated damages
to holders of the outstanding debt from June 8, 1999 until it consummates the
exchange offer. See "Description of the Registered Debt--Registration Rights;
Liquidated Damages" for more information on liquidated damages. Upon the
completion of the exchange offer, holders of outstanding debt will not be
entitled to any liquidated damages on the outstanding debt or any further
registration rights under the registration rights agreement, except under
limited circumstances. The exchange offer is not extended to outstanding debt
holders in any jurisdiction where the exchange offer does not comply with the
securities or blue sky laws of that jurisdiction.

   In the event that (1) applicable interpretations of the SEC's staff do not
permit Monsanto to conduct the exchange offer, or (2) certain holders of the
outstanding debt notify Monsanto that they are not eligible to participate in,
or would not receive freely tradeable registered debt in exchange for tendered
outstanding debt in, the exchange offer, Monsanto will use its reasonable
efforts to cause to become effective a shelf registration statement with
respect to the resale of the outstanding debt.

   Monsanto also agreed to use its reasonable efforts to keep the shelf
registration statement effective until the earlier of (1) two years after the
date of the issuance of the outstanding debt, unless Rule 144(k) is amended to
provide a shorter restrictive period, or (2) such time as when all the
securities covered by the shelf registration statement have been sold.

   The term "holder" as used in this section of the prospectus entitled "The
Exchange Offer" means (1) any person in whose name the outstanding debt is
registered on Monsanto's books, or (2) any other person who has obtained a
properly completed bond power from the registered holder, or (3) any person
whose outstanding debt is held of record by DTC and who wants to deliver such
outstanding debt by book-entry transfer at DTC.

Terms of the Exchange Offer

   Monsanto is offering to exchange up to $2,500,000,000 total principal amount
of registered debt for a like total principal amount of outstanding debt. The
outstanding debt must be tendered properly on or before the expiration date of
the exchange offer and not withdrawn. In exchange for outstanding debt properly
tendered and accepted, Monsanto will issue a like total principal amount of up
to $2,500,000,000 in registered debt.

   The exchange offer is not conditioned upon holders tendering a minimum
principal amount of outstanding debt. As of the date of this prospectus,
$2,500,000,000 aggregate principal amount of outstanding debt is outstanding.

                                       9
<PAGE>

   Holders of the outstanding debt do not have any appraisal or dissenters'
rights in the exchange offer. If holders do not tender outstanding debt or
tender outstanding debt that Monsanto does not accept, their outstanding debt
will remain outstanding. Any outstanding debt will be entitled to the benefits
of the indenture, but will not be entitled to any further registration rights
under the registration rights agreement, except under limited circumstances.

   After the expiration date of the exchange offer, Monsanto will return to the
holder any tendered outstanding debt that Monsanto did not accept for exchange
due to, among other things, an invalid tender.

   Holders exchanging outstanding debt will not have to pay brokerage
commissions or fees or transfer taxes if they follow the instructions in the
letter of transmittal. Monsanto will pay the charges and expenses, other than
certain taxes described below, in the exchange offer. See "--Fees and Expenses"
for further information regarding fees and expenses.

   Neither Monsanto nor Monsanto's board of directors recommends that you
tender or not tender your outstanding debt in the exchange offer. In addition,
Monsanto has not authorized anyone to make any recommendation. You must decide
whether to tender your outstanding debt in the exchange offer and, if so, the
aggregate amount of such outstanding debt to tender.

   As used in this prospectus, the "expiration date" of the exchange offer is
5:00 p.m., New York City time, on       , 1999, unless Monsanto, in its sole
discretion, extends the exchange offer to allow additional tenders of
outstanding debt. The registration rights agreement requires Monsanto to keep
the exchange offer open for at least thirty days. Because Monsanto did not
consummate the exchange offer by July 22, 1999, the registration rights
agreement requires Monsanto to pay liquidated damages to the holders of
outstanding debt until it consummates the exchange offer. Consequently,
Monsanto does not expect to extend the exchange offer past the expiration date
but may do so to permit additional holders to exchange their outstanding debt.

   Monsanto has the right, in accordance with applicable law, at any time:

  .  to delay the acceptance of the outstanding debt;

  .  to terminate the exchange offer if Monsanto determines that any of the
     conditions to the exchange offer have not occurred or have not been
     satisfied;

  .  to extend the expiration date of the exchange offer and keep all
     outstanding debt tendered other than those outstanding notes and
     debentures properly withdrawn; and

  .  to waive any condition or amend the terms of the exchange offer.

   If Monsanto materially changes the exchange offer, or if Monsanto waives a
material condition of the exchange offer, Monsanto will promptly distribute a
prospectus supplement to the holders of the outstanding debt disclosing the
change or waiver. Monsanto also will extend the exchange offer as required by
Rule 14e-1 under the Securities Exchange Act of 1934.

   If Monsanto exercises any of the rights listed above, it will promptly give
oral or written notice of the action to the exchange agent and will issue a
release to an appropriate news agency. In the case of an extension, an
announcement will be made no later than 9:00 a.m., New York City time, on the
next business day after the previously scheduled expiration date.

Acceptance for Exchange and Issuance of Registered Debt

   Monsanto will issue registered debt to the exchange agent for outstanding
debt tendered and accepted, and not withdrawn, promptly on or after the
expiration date. The exchange agent might not deliver the registered debt to
all tendering holders at the same time. The timing of delivery depends upon
when the exchange agent receives and processes the required documents.

                                       10
<PAGE>

   Monsanto will be deemed to have exchanged outstanding debt validly tendered
and not withdrawn when Monsanto gives oral or written notice to the exchange
agent of their acceptance. The exchange agent is an agent for Monsanto for
purposes of receiving tenders of outstanding debt, letters of transmittal and
related documents. The exchange agent also is an agent for tendering holders
for purposes of receiving outstanding debt, letters of transmittal and related
documents and transmitting registered debt to validly tendering holders. If for
any reason, Monsanto (1) delays the acceptance or exchange of any outstanding
debt; (2) extends the exchange offer; or (3) is unable to accept or exchange
outstanding debt, then the exchange agent may, on behalf of Monsanto, and
subject to Rule 14e-1(c) under the Exchange Act, retain tendered notes and
debentures. Tendered notes and debentures retained by the exchange agent may
not be withdrawn, except according to the withdrawal procedures outlined in the
section entitled "--Withdrawal Rights" below.

   In tendering outstanding debt, you must warrant in the letter of transmittal
or in an "Agent's Message", as described below, that:

  .  you have full power and authority to tender, exchange, sell, assign and
     transfer your outstanding debt;

  .  Monsanto will acquire good, marketable and unencumbered title to the
     tendered outstanding debt, free and clear of all liens, restrictions,
     charges and other encumbrances; and

  .  the outstanding debt tendered for exchange is not subject to any adverse
     claims or proxies.

   You also must warrant and agree that you will, upon request, execute and
deliver any additional documents requested by Monsanto or the exchange agent to
complete the exchange, sale, assignment, and transfer of the outstanding debt
and that you will comply with your obligations under the registration rights
agreement.

Procedures for Tendering Outstanding Debt

 Valid Tender

   You may tender your outstanding debt by book-entry transfer or, if you hold
certificated securities, by other means, as described below. For book-entry
transfer, you must deliver to the exchange agent either (1) a completed and
signed letter of transmittal or (2) an "agent's message". An agent's message
means a message, transmitted by DTC to and received by the exchange agent which
forms part of a confirmation of a book-entry transfer of outstanding debt into
the exchange agent's account at DTC. The agent's message states that DTC has
received an express acknowledgment from the tendering participant that such
participant has received and agrees to be bound by the letter of transmittal
and that Monsanto may enforce the letter of transmittal against such
participant.

   You must deliver your letter of transmittal or the agent's message by mail,
facsimile, hand delivery or overnight carrier to the exchange agent on or
before the expiration date. In addition, to complete a book-entry transfer, you
must also either (1) have DTC transfer the outstanding debt into the exchange
agent's account at DTC using the ATOP procedures for transfer, and obtain a
confirmation of such transfer, or (2) follow the guaranteed delivery procedures
described below under "--Guaranteed Delivery Procedures."

   If you tender less than all of your outstanding debt, you should fill in the
principal amount of notes and debentures tendered in the appropriate box on the
letter of transmittal. If you do not indicate the amount tendered in the
appropriate box, Monsanto will assume you are tendering all outstanding debt
that you hold.

   For tendering your outstanding debt other than by book-entry transfer, you
must deliver a completed and signed letter of transmittal to the exchange
agent. Again, you must deliver the letter of transmittal by mail, facsimile,
hand delivery or overnight carrier to the exchange agent on or before the
expiration date. In addition, to complete a valid tender you must either (1)
deliver your outstanding debt to the exchange agent on or before the expiration
date, or (2) follow the guaranteed delivery procedures set forth below under
"--Guaranteed Delivery Procedures."

                                       11
<PAGE>

   Delivery of required documents by whatever method you choose is at your sole
risk. Delivery is complete when the exchange agent actually receives the items
to be delivered. Delivery of documents to DTC in accordance with DTC's
procedures does not constitute delivery of such documents to the exchange
agent. If delivery is made by mail, then registered mail, return receipt
requested, properly insured, or an overnight delivery service is recommended.
In all cases, you should allow sufficient time to ensure timely delivery.

 Signature Guarantees

   You do not need to endorse certificates for the outstanding debt or provide
signature guarantees on the letter of transmittal, unless (1) someone other
than the registered holder tenders the certificate or (2) you complete the box
entitled "Special Issuance Instructions" or "Special Delivery Instructions" in
the letter of transmittal. In the case of (1) or (2) above, you must sign your
outstanding debt or provide a properly executed bond power, with the signature
on the bond power and on the letter of transmittal guaranteed by a firm or
other entity identified in Rule 17Ad-15 under the Exchange Act as an "eligible
guarantor institution."

   An "eligible guarantor institution" includes: (1) a bank; (2) a broker,
dealer, municipal securities broker or dealer or government securities broker
or dealer; (3) a credit union; (4) a national securities exchange, registered
securities association or clearing agency; or (5) a savings association that is
a participant in a securities transfer association.

 Guaranteed Delivery

   If you want to tender your outstanding debt in the exchange offer and (1)
the certificates for the outstanding debt are not immediately available or all
required documents are unlikely to reach the exchange agent on or before the
expiration date, or (2) a book-entry transfer cannot be completed in time, you
may tender your outstanding debt if you comply with the following guaranteed
delivery procedures:

     (a) you tender through an eligible guarantor institution;

     (b) you deliver a properly completed and signed notice of guaranteed
  delivery, like the form provided with the letter of transmittal, to the
  exchange agent on or before the expiration date; and

     (c) you deliver the certificates or a confirmation of book-entry
  transfer and a properly completed and signed letter of transmittal to the
  exchange agent within three New York Stock Exchange trading days after the
  notice of guaranteed delivery is executed.

   You may deliver the notice of guaranteed delivery by hand, facsimile or mail
to the exchange agent and must include a guarantee by an eligible guarantor
institution in the form described in the notice.

   Monsanto's acceptance of properly tendered outstanding debt is a binding
agreement between the tendering holder and Monsanto upon the terms and subject
to the conditions of the exchange offer.

 Determination of Validity

   Monsanto will resolve all questions regarding the form of documents,
validity, eligibility (including time of receipt) and acceptance for exchange
of any tendered outstanding debt. Monsanto's resolution of these questions and
Monsanto's interpretation of the terms and conditions of the exchange offer,
including the letter of transmittal, are final and binding on all parties. A
tender of outstanding debt is invalid until all irregularities have been cured
or waived. None of Monsanto, any of its affiliates or assigns, the exchange
agent nor any other person is under any obligation to give notice of any
irregularities in tenders nor will they be liable for failing to give any such
notice. Monsanto reserves the absolute right, in its sole and absolute
discretion, to reject any tenders determined to be in improper form or
unlawful. Monsanto also reserves the absolute right to waive any of the
conditions of the exchange offer or any condition or irregularity in the tender
of outstanding debt by any holder. Monsanto need not waive similar conditions
or irregularities in the case of other holders.

                                       12
<PAGE>

   If any letter of transmittal, endorsement, bond power, power of attorney, or
any other document required by the letter of transmittal is signed by a
trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
that person must indicate that capacity when signing. In addition, unless
waived by Monsanto, the person must submit proper evidence satisfactory to
Monsanto, in its sole discretion, of his or her authority to so act.

   A beneficial owner of outstanding debt that is held by or registered in the
name of a broker, dealer, commercial bank, trust company or other nominee or
custodian should contact that entity promptly if the holder wants to
participate in the exchange offer.

Resales of Registered Debt

   Monsanto is exchanging the outstanding debt for registered debt based upon
the position of the SEC's staff, set forth in interpretive letters to third
parties in other similar transactions. Monsanto will not seek its own
interpretive letter. As a result, Monsanto cannot assure you that the SEC's
staff will take the same position on this exchange offer as it did in
interpretive letters to other parties. Based on the SEC's staff's letters to
other parties, Monsanto believes that holders of registered debt, other than
broker-dealers, can offer the registered notes and debentures for resale,
resell and otherwise transfer such registered debt without delivering a
prospectus to prospective purchasers, other than as described below.

   Any holder of outstanding debt who is an "affiliate" of Monsanto or who
intends to distribute registered debt, or any broker-dealer who purchased
outstanding debt from Monsanto for resale pursuant to Rule 144A or any other
available exemption under the Securities Act:

  .  cannot rely on the SEC's staff's interpretations in the above-mentioned
     interpretive letters;

  .  cannot tender outstanding debt in the exchange offer; and

  .  must comply with the registration and prospectus delivery requirements
     of the Securities Act to transfer the outstanding debt, unless the sale
     is exempt.

   In addition, if any broker-dealer acquired outstanding debt for its own
account as a result of market-making or other trading activities and exchanges
such outstanding debt for registered debt, such broker-dealer must deliver a
prospectus with any resales of its registered debt.

   If you want to exchange your outstanding debt for registered debt, you will
be required to affirm that:

  .  you are not an "affiliate" of Monsanto;

  .  you are acquiring the registered debt in the ordinary course of your
     business;

  .  you have no arrangement or understanding with any person to participate
     in a "distribution", within the meaning of the Securities Act, of the
     registered debt; and

  .  if you are not a broker-dealer, you are not engaged in, and do not
     intend to engage in, a "distribution", within the meaning of the
     Securities Act, of the registered debt.

   In addition, Monsanto may require you to provide information regarding the
number of "beneficial owners," within the meaning of Rule 13d-3 under the
Exchange Act, of the outstanding debt. Each broker-dealer that receives
registered debt for its own account must acknowledge that it acquired its
outstanding debt for its own account as the result of market-making activities
or other trading activities and must agree that it will deliver a prospectus
meeting the requirements of the Securities Act in connection with any resale of
such registered debt. By making this acknowledgment and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" under the Securities Act. Based on the SEC's staff's position in
certain interpretive letters, Monsanto believes that broker-dealers who
acquired outstanding debt for their own accounts as a result of market-making
activities or other trading activities may fulfill their prospectus delivery

                                       13
<PAGE>

requirements with respect to the registered debt with a prospectus meeting the
requirements of the Securities Act. Accordingly, a broker-dealer may use this
prospectus to satisfy such requirements. Monsanto has agreed that, starting on
the expiration date of the exchange offer and ending on the close of business
on the 180th day following such expiration date, it will make this prospectus,
as amended or supplemented, available to any broker-dealer for use in
connection with any such resale. See "Plan of Distribution" for more
information. A broker-dealer intending to use this prospectus in the resale of
registered debt must notify Monsanto, on or prior to the expiration date, that
it is a participating broker-dealer. This notice may be given in the letter of
transmittal or may be delivered to the exchange agent. Any participating
broker-dealer who is an "affiliate" of Monsanto may not rely on the SEC's
staff's interpretive letters and must comply with the registration and
prospectus delivery requirements of the Securities Act when reselling its
registered debt.

   Monsanto agrees to advise holders of, among other things:

  .  any SEC request for amendments or supplements to the registration
     statement or this prospectus or for additional information;

  .  the SEC's issuance of any stop order suspending the effectiveness of the
     registration statement or the initiation of any proceedings for that
     purpose; and

  .  Monsanto's receipt of any notification with respect to the suspension of
     the qualification of the registered debt in any jurisdiction or the
     initiation or threatening of any proceeding for such purpose.

   Upon the occurrence of any of these events, Monsanto agrees to notify the
holders, if applicable, to suspend use of this prospectus and Monsanto shall
prepare, using its reasonable efforts to do so as soon as possible, a post-
effective amendment to the registration statement or an amendment or supplement
to this prospectus or file any other required document so that, as thereafter
delivered to purchasers of the registered debt, the prospectus will not include
an untrue statement of a material fact or omit to state any material fact
necessary to make the statements herein, in the light of the circumstances
under which they were made, not misleading. The holders, if applicable, agree
that they shall suspend use of this prospectus until Monsanto has amended or
supplemented the prospectus so that it does not contain any such untrue
statement or omission.

Withdrawal Rights

   You can withdraw tenders of outstanding debt at any time on or before the
expiration date of the exchange offer.

   For a withdrawal to be effective, you must deliver a written or facsimile
transmission of a "notice of withdrawal" to the exchange agent on or before the
expiration date. The notice of withdrawal must specify the name of the person
tendering the outstanding debt to be withdrawn, the total principal amount of
outstanding debt withdrawn, and the name of the registered holder of the
outstanding debt if it is different from the name of the person tendering the
outstanding debt. If you delivered outstanding debt to the exchange agent, you
must submit the serial numbers of the outstanding debt to be withdrawn and the
signature on the notice of withdrawal must be guaranteed by an eligible
guarantor institution, except in the case of outstanding debt tendered for the
account of an eligible guarantor institution. If you tendered outstanding debt
as a book-entry transfer, the notice of withdrawal must specify the name and
number of the account at DTC to be credited with the withdrawal of outstanding
debt and you must deliver the notice of withdrawal to the exchange agent by
written, telegraphic, telex or facsimile transmission. You may not rescind
withdrawals of tender. Outstanding debt properly withdrawn may again be
tendered at any time on or before the expiration date.

   Monsanto will determine all questions regarding the validity, form and
eligibility of withdrawal notices. Monsanto's determination will be final and
binding on all parties. None of Monsanto, any of its affiliates or assigns, the
exchange agent nor any other person is under any obligation to give notice of
any irregularities in any notice of withdrawal, nor will they be liable for
failing to give any such notice. Withdrawn outstanding debt will be returned to
the holder after withdrawal.

                                       14
<PAGE>

Interest on Registered Debt

   The registered debt will bear interest at the respective rates per year that
appear on the cover page of this prospectus, payable semi-annually, on June 1
and December 1 of each year, commencing December 1, 1999. Holders of registered
debt will receive interest on December 1, 1999 from the date of initial
issuance of the registered debt, plus an amount equal to the accrued, but
unpaid, interest on the outstanding debt. Interest on the outstanding debt
accepted for exchange will cease to accrue upon issuance of the registered
debt.

Conditions to the Exchange Offer

   Monsanto need not exchange any outstanding debt, may terminate the exchange
offer or may waive any conditions to the exchange offer or amend the exchange
offer, if any of the following conditions have occurred:

  .  the SEC's staff no longer allows the registered debt to be offered for
     resale, resold and otherwise transferred by certain holders without
     compliance with the registration and prospectus delivery provisions of
     the Securities Act;

  .  a governmental body passes any law, statute, rule or regulation which,
     in Monsanto's opinion, prohibits or prevents the exchange offer;

  .  the SEC or any state securities authority issues a stop order suspending
     the effectiveness of the registration statement or initiates or
     threatens to initiate a proceeding to suspend the effectiveness of the
     registration statement; or

  .  Monsanto is unable to obtain any governmental approval that Monsanto
     believes is necessary to complete the exchange offer.

   If Monsanto reasonably believes that any of the above conditions has
occurred, it may (1) terminate the exchange offer, whether or not any
outstanding debt has been accepted for exchange, (2) waive any condition to the
exchange offer or (3) amend the terms of the exchange offer in any respect.
Monsanto's failure at any time to exercise any of these rights will not waive
such rights, and each right will be deemed an ongoing right which may be
asserted at any time or from time to time. However, Monsanto does not intend to
terminate the exchange offer if none of the preceding conditions has occurred.

Exchange Agent

   Monsanto appointed The Bank of New York as exchange agent for the exchange
offer. Holders should direct questions and requests for assistance, requests
for additional copies of this prospectus or of the letter of transmittal and
requests for notice of guaranteed delivery to the exchange agent addressed as
follows:

    By Registered or Certified Mail:         By Hand Or Overnight Delivery:
          The Bank of New York                    The Bank of New York
         101 Barclay Street, 7E                    101 Barclay Street
        New York, New York 10286            Corporate Trust Services Window
       Attention: Noriko Miyazaki                     Ground Level
                                                New York, New York 10286
                                               Attention: Noriko Miyazaki

                             Confirm by Telephone:
                                Noriko Miyazaki
                                 (212) 815-6333

                            Facsimile Transmissions:
                     (Eligible Guarantor Institutions Only)
                                 (212) 815-4699

   If you deliver letters of transmittal and any other required documents to an
address or facsimile number other than those listed above, your tender is
invalid.


                                       15
<PAGE>

Fees and Expenses

   Monsanto will pay the exchange agent reasonable and customary fees for its
services and reasonable out-of-pocket expenses. Monsanto will also pay
brokerage houses and other custodians, nominees and fiduciaries their
reasonable out-of-pocket expenses for sending copies of this prospectus and
related documents to holders of outstanding debt, and in handling or tendering
for their customers.

   Monsanto will pay the transfer taxes for the exchange of the outstanding
debt in the exchange offer. If, however, exchange debt is delivered to or
issued in the name of a person other than the registered holder, or if a
transfer tax is imposed for any reason other than for the exchange of
outstanding debt in the exchange offer, then the tendering holder will pay the
transfer taxes. If a tendering holder does not submit satisfactory evidence of
payment of taxes or exemption from taxes with the letter of transmittal, the
taxes will be billed directly to the tendering holder.

   Monsanto will not make any payment to brokers, dealers or other nominees
soliciting acceptances in the exchange offer.

Accounting Treatment

   The registered debt will be recorded at the same carrying value as the
outstanding debt. Accordingly, Monsanto will not recognize any gain or loss for
accounting purposes. Monsanto intends to amortize the expenses of the exchange
offer and issuance of the outstanding debt over the respective terms of each
series of the registered debt.

                                       16
<PAGE>

                       DESCRIPTION OF THE REGISTERED DEBT

   The outstanding debt was, and the registered debt will be, issued pursuant
to an indenture, dated as of December 1, 1998, between Monsanto and The Bank of
New York, as trustee. A copy of the indenture has been filed as an exhibit to
Monsanto's Current Report on Form 8-K filed with the SEC on December 14, 1998
and is incorporated by reference as an exhibit to the registration statement of
which this prospectus is a part. The terms of the registered debt are the same
as the terms of the outstanding debt, except that (1) Monsanto registered the
registered debt under the Securities Act, and, unlike the outstanding debt, its
transfer is not restricted and (2) holders of the registered debt are not
entitled to certain rights under the registration rights agreement.

   Because this section of the prospectus merely summarizes the terms of the
registered debt, you should read the indenture and the relevant portions of the
Trust Indenture Act of 1939 for more complete information regarding the terms
of the registered debt, including the definition of certain terms used in this
section. Copies of the indenture and registration rights agreement can be
obtained by following the instructions contained in this prospectus under the
headings "Where You Can Find More Information" and "Incorporation of Certain
Documents by Reference."

General

   The registered debt will have the following terms:

<TABLE>
<CAPTION>
                                           Principal   Interest
                                             Amount      Rate    Maturity Date
                                          ------------ -------- ----------------
      <S>                                 <C>          <C>      <C>
      Notes due 2001..................... $500,000,000  5.375%  December 1, 2001
      Notes due 2005..................... $600,000,000  5.750%  December 1, 2005
      Notes due 2008..................... $200,000,000  5.875%  December 1, 2008
      Debentures due 2018................ $500,000,000  6.500%  December 1, 2018
      Debentures due 2028................ $700,000,000  6.600%  December 1, 2028
</TABLE>

   The registered debt consists of five separate series for purposes of the
indenture. The registered debt will be Monsanto's senior unsecured obligations.
Payment of the principal of and interest on the registered debt will rank
equally with all other senior unsecured debt of Monsanto. Certain series of the
registered debt may be redeemable in whole or in part at any time at Monsanto's
option. See "--Optional Redemption." The registered debt will not be entitled
to the benefit of any mandatory redemption or sinking fund. The indenture does
not limit the amount of additional indebtedness Monsanto or any of its
subsidiaries may incur. The indenture does not limit the amount of debt
securities that Monsanto may issue thereunder and provides that such debt
securities may be issued from time to time in one or more series. As of the
date of this prospectus, no debt securities, other than the outstanding debt
described in this prospectus, were outstanding under the indenture.

   The registered debt will bear interest at the respective rates per year that
appear on the cover page of this prospectus and such interest will be payable
semiannually in arrears on June 1 and December 1 of each year, commencing on
December 1, 1999, to the persons in whose names the registered debt is
registered at the close of business on the immediately preceding May 15 and
November 15, respectively. Holders of registered debt will receive interest on
December 1, 1999 from the date of initial issuance of the registered debt, plus
an amount equal to the accrued, but unpaid, interest on the outstanding debt.
Interest on the registered debt will accrue from the most recent date to which
interest has been paid or, if no interest has been paid, from the date of
original issuance. Principal of, premium, if any, and interest on the
registered debt will be payable, and the transfer of registered debt will be
registrable, at the office or agency of Monsanto to be maintained for such
purpose in the Borough of Manhattan, The City of New York, except that, at
Monsanto's option, interest may be paid by mailing a check to the address of
the person entitled thereto as it appears on the registered debt register.


                                       17
<PAGE>


   Interest on the registered debt will be computed on the basis of a 360-day
year comprised of twelve 30-day months. The amount of interest payable for any
period shorter than a full semiannual period for which interest is computed
will be computed on the basis of the actual number of days elapsed per 30-day
month. In the event that any date on which principal, premium, if any, or
interest is payable on the registered debt is not a business day (as defined in
the indenture), then payment of the principal, premium, if any, or interest
payable on such date will be made on the next succeeding day that is a business
day. Such payment will be made without any interest or other payment in respect
of any such delay. The registered debt will be issued initially in minimum
denominations of $100,000 and will be available for purchase in integral
multiples of $1,000 in excess thereof.

Optional Redemption

 Redemption Provisions.

   The Notes due 2001 are not redeemable prior to maturity. The other series of
registered debt will be redeemable, as a whole or in part, at Monsanto's
option, at any time or from time to time, on at least 30 days, but not more
than 60 days, prior notice mailed to the registered address of each holder of
registered debt. The redemption prices will be equal to the greater of (1) 100%
of the principal amount of the registered debt to be redeemed and (2) the sum
of the present values of the Remaining Scheduled Payments (as defined below)
discounted, on a semiannual basis which assumes a 360-day year consisting of
twelve 30-day months, at a rate equal to the sum of the applicable Treasury
Rate (as defined below) plus (a) 15 basis points for the Notes due 2005, (b) 20
basis points for the Notes due 2008 and the Debentures due 2018 and (c) 25
basis points for the Debentures due 2028, plus, in each case, accrued interest
to the date of redemption.

   On and after the redemption date, interest will cease to accrue on the
registered debt or any portion of the registered debt called for redemption
(unless Monsanto defaults in the payment of the redemption price and accrued
interest). On or before the redemption date, Monsanto will deposit with a
paying agent (or the trustee) money sufficient to pay the redemption price of
and accrued interest on the registered debt to be redeemed on such date. If
less than all of the registered debt of any series are to be redeemed, the
registered debt to be redeemed shall be selected by the trustee by such method
as the trustee shall deem fair and appropriate.

 Certain Definitions.

   "Treasury Rate" means, with respect to any redemption date, the rate per
annum equal to the semiannual equivalent yield to maturity (computed as of the
second business day immediately preceding such redemption date) of the
Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable
Treasury Price for such redemption date.

   "Comparable Treasury Issue" means the United States Treasury security
selected by an Independent Investment Banker as having a maturity comparable to
the remaining term of the Notes due 2005, the Notes due 2008, the Debentures
due 2018 or the Debentures due 2028, as the case may be, to be redeemed that
would be utilized, at the time of selection and in accordance with customary
financial practice, in pricing new issues of corporate debt securities of
comparable maturity to the remaining term of such series of registered debt.
"Independent Investment Banker" means one of the Reference Treasury Dealers
appointed by Monsanto.

   "Comparable Treasury Price" means, with respect to any redemption date, the
average of the Reference Treasury Dealer Quotations for such redemption date.
"Reference Treasury Dealer Quotations" means, with respect to each Reference
Treasury Dealer and any redemption date, the average, as determined by the
trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) quoted in
writing to the trustee by such Reference Treasury Dealer at 3:30 p.m., New York
City time, on the third business day preceding such redemption date.

   "Reference Treasury Dealer" means each of Salomon Smith Barney Inc. and
Goldman, Sachs & Co. and their respective successors. If any of the foregoing
shall cease to be a primary U.S. Government securities dealer (a "Primary
Treasury Dealer"), Monsanto shall substitute another nationally recognized
investment banking firm that is a Primary Treasury Dealer.

                                       18
<PAGE>

   "Remaining Scheduled Payments" means, with respect to registered debt to be
redeemed, the remaining scheduled payments of principal of and interest on such
registered debt that would be due after the related redemption date but for
such redemption. If such redemption date is not an interest payment date with
respect to such registered debt, the amount of the next succeeding scheduled
interest payment on such registered debt will be reduced by the amount of
interest accrued on such registered debt to such redemption date.

Certain Covenants

   Restriction on Liens. The indenture provides that Monsanto will not, nor
will it permit a Restricted Subsidiary to, secure indebtedness for money
borrowed by placing a lien on any Operating Property owned or leased by
Monsanto or any Restricted Subsidiary or on any shares of stock or debt of any
Restricted Subsidiary without equally and ratably securing the registered debt,
unless (1) the principal amount of such indebtedness plus (2) the Attributable
Debt in respect of Sale and Leaseback Transactions (other than Sale and
Leaseback Transactions the proceeds of which are applied as provided under the
second bullet point of the following paragraph) does not exceed 10% of the
Consolidated Net Assets of Monsanto and its consolidated subsidiaries.

   This restriction will not apply to, and there shall be excluded in computing
secured indebtedness for purposes of this restriction, certain permitted liens,
including:

  .  liens existing as of the date of the indenture;

  .  liens existing at the time any corporation becomes a Restricted
     Subsidiary;

  .  liens on property existing at the time of acquisition and certain
     purchase money or similar liens;

  .  liens to secure certain development, operation, construction,
     alteration, repair or improvement costs;

  .  liens securing indebtedness owing to Monsanto or another Restricted
     Subsidiary by a Restricted Subsidiary;

  .  liens in connection with either government contracts, including the
     assignment of moneys due or to become due thereon or obligations issued
     by a state or a commonwealth or certain other governmental entities;

  .  certain liens in connection with legal proceedings or arising in the
     ordinary course of business and not in connection with the borrowing of
     money; and

  .  extensions, substitutions, replacements or renewals of the foregoing.
     (Section 1007)

   Restriction on Sale and Leaseback Transactions. The indenture further
provides that Monsanto will not, nor will it permit any Restricted Subsidiary
to, enter into any Sale and Leaseback Transaction unless either

   (1) the Attributable Debt in respect thereto and all other sale and
leaseback transactions entered into after the date of the indenture (other than
those the proceeds of which are applied to reduce indebtedness under (2)
following), plus the aggregate amount of then outstanding secured indebtedness
not otherwise permitted or excepted without equally and ratably securing the
registered debt, does not exceed 10% of the Consolidated Net Assets of Monsanto
and its consolidated subsidiaries, or

   (2) an amount equal to the fair value of the Operating Property leased is
applied within 120 days to (a) the purchase of any asset or any interest in an
asset which would qualify after purchase, as an Operating Property or (b) the
retirement of the registered debt or other indebtedness maturing more than one
year thereafter. (Section 1008)

 Certain Definitions.

   "Attributable Debt", in respect of the sale and leaseback transactions
described above, means, as of the time of determination, the total obligation
(discounted to present value at the rate per year equal to the discount rate
which would be applicable to a capital lease obligation with like term in
accordance with generally

                                       19
<PAGE>

accepted accounting principles) of the lessee for rental payments (other than
amounts required to be paid on account of property taxes, maintenance, repairs,
insurance, water rates and other items which do not constitute payments for
property rights) during the remaining portion of the initial term of the lease
included in such sale and leaseback transaction. (Section 101)

   "Consolidated Net Assets" is the aggregate amount of assets (less applicable
reserves and other properly deductible items) after deducting therefrom all
current liabilities (excluding certain renewable or extendible indebtedness) as
shown on the latest balance sheet of Monsanto and its consolidated subsidiaries
and computed in accordance with generally accepted accounting principles.
(Section 101)

   An "Operating Property" is any real property or equipment located within the
United States and used primarily for manufacturing by Monsanto or any of its
Subsidiaries that has a net book value (after deduction of accumulated
depreciation) in excess of 2.0% of Consolidated Net Assets, other than any such
property or equipment

     (1) which is financed by obligations issued by a state, commonwealth,
  territory or possession of the United States of America, or any political
  subdivision or governmental authority of any of the foregoing, or

     (2) which, in the opinion of Monsanto's Board of Directors, is not of
  material importance to the total business conducted by Monsanto and its
  Restricted Subsidiaries taken as a whole. (Section 101)

   A "Restricted Subsidiary" is any Subsidiary of Monsanto that owns any
Operating Property.

   A "Sale and Leaseback Transaction" is any arrangement with any bank,
insurance company or other lender or investor (other than Monsanto or another
Restricted Subsidiary) providing for the leasing by Monsanto or any Restricted
Subsidiary of any Operating Property (except a lease for a temporary period not
to exceed three years by the end of which it is intended that the use of such
Operating Property by the lessee will be discontinued), which was or is owned
or leased by Monsanto or a Restricted Subsidiary and which has been or is to be
sold or transferred, more than 120 days after the acquisition or the completion
of construction and commencement of full operation thereof, by Monsanto or such
Restricted Subsidiary to such lender or investor or to any Person to whom funds
have been or are to be advanced by such lender or investor on the security of
such Operating Property.

No Special Protection in the Event of a Highly Leveraged Transaction

   Like the holders of Monsanto's other public debt securities, Holders of Debt
Securities will have no special protection in the event of a highly leveraged
transaction.

Events of Default

   An Event of Default with respect to any series of debt securities is defined
in the indenture as:

  .  default in payment of principal of or premium, if any, on any debt
     security of that series at Maturity;

  .  default for 30 days in payment of interest on any debt security of that
     series;

  .  default for 30 days in the deposit of any sinking fund payment when due
     in respect of that series;

  .  failure by Monsanto in the performance of any other of the covenants or
     warranties in the indenture continued for 90 days after due notice by
     the trustee or by Holders of at least 25% in principal amount of the
     outstanding debt securities of that series;

  .  certain events of bankruptcy, insolvency or reorganization of Monsanto;
     and

  .  any other Event of Default provided with respect to debt securities of
     that series. (Section 501)

   The indenture provides that, if any Event of Default with respect to debt
securities of any series at the time outstanding occurs and is continuing,
either the trustee or the Holders of not less than 25% in principal amount of
the outstanding debt securities of that series may declare the principal amount
(or, if the debt

                                       20
<PAGE>


securities of that series are Original Issue Discount Securities or Indexed
Securities (as defined in the indenture), such portion of the principal amount
of such debt securities as may be specified in the terms thereof) of all debt
securities of that series to be due and payable immediately, but upon certain
conditions such declaration may be annulled and past defaults (except, unless
theretofore cured, a default in payment of principal of or premium, if any, or
interest, if any, on the debt securities of that series and certain other
specified defaults) may be waived by the Holders of a majority in principal
amount of the outstanding debt securities of that series on behalf of the
Holders of all debt securities of that series. (Sections 502 and 513)

   The indenture provides that the trustee will, within 90 days after the
occurrence of a default with respect to debt securities of any series at the
time outstanding, give to the Holders of the outstanding debt securities of
that series notice of such default known to it if uncured or not waived,
provided that, except in the case of default in the payment of principal of or
premium, if any, or interest on any debt security of that series, or in the
deposit of any sinking fund payment which is provided for, such notice shall
not be given until 30 days after the occurrence of a default with respect to
outstanding debt securities of such series. The term "default" with respect to
any series of outstanding debt securities for the purpose only of this
provision means the happening of any of the Events of Default specified in the
indenture and relating to such series of outstanding debt securities, excluding
any grace periods and irrespective of any notice requirements. (Section 602)

   The indenture contains a provision entitling the trustee, subject to the
duty of the trustee during default to act with the required standard of care,
to be indemnified by the Holders of any series of outstanding debt securities
before proceeding to exercise any right or power under the indenture at the
request of the Holders of such series of debt securities. (Section 603) The
indenture provides that the Holders of a majority in principal amount of
outstanding debt securities of any series may direct the time, method and place
of conducting any proceeding for any remedy available to the trustee, or
exercising any trust or other power conferred on the trustee, with respect to
the debt securities of such series provided that the trustee may decline to act
if such direction is contrary to law or the indenture or would expose it to
personal liability. (Section 512)

Defeasance of Debt Securities or Certain Covenants in Certain Circumstances

   Defeasance and Discharge. The terms of any series of debt securities will
provide that Monsanto will be discharged from any and all obligations in
respect of the debt securities of such series (except for certain obligations
to register the transfer or exchange of debt securities of such series, to
replace stolen, lost or mutilated debt securities of such series, to maintain
paying agencies and hold moneys for payment in trust) upon the deposit with the
trustee, in trust, of money and/or U.S. Government Obligations which, through
the payment of interest and principal thereof in accordance with their terms,
will provide money in an amount sufficient to pay and discharge the principal
of, and premium, if any, and interest on, and any mandatory sinking fund
payments applicable to, the debt securities of such series on the stated
maturity of such payments in accordance with the terms of the indenture and
such debt securities. Such discharge may only occur if, among other things,
Monsanto has delivered to the trustee an opinion of counsel to the effect that
Monsanto has received from, or there has been published by, the United States
Internal Revenue Service a ruling, or there has been a change in tax law, in
either case to the effect that such a discharge will not be deemed, or result
in, a taxable event with respect to Holders of the debt securities of such
series. (Article Thirteen)

   Defeasance of Certain Covenants. The terms of any series of debt securities
will provide Monsanto with the option to omit to comply with certain
restrictive covenants, including those described in Sections 801, 1007 and 1008
of the indenture. Monsanto, in order to exercise such option, will be required
to deposit with the trustee money and/or U.S. Government Obligations, which,
through the payment of interest and principal thereof in accordance with their
terms, will provide money in an amount sufficient to pay the principal of, and
premium, if any, and interest on, and mandatory sinking fund payments
applicable to the debt securities of such series on the stated maturity of such
payments in accordance with the terms of the indenture and such debt
securities. Monsanto will also be required to deliver to the trustee an opinion
of counsel to the effect that the deposit and related covenant defeasance will
not cause the Holders of the debt securities of such series to recognize
income, gain or loss for federal income tax purposes. In the event Monsanto
exercises this option and

                                       21
<PAGE>


the debt securities of such series are declared due and payable because of the
occurrence of any Event of Default, the amount of money and U.S. Government
Obligations, as the case may be, on deposit with the trustee will be sufficient
to pay amounts due on the debt securities of such series at the time of their
stated maturity but may not be sufficient to pay amounts due on the debt
securities of such series at the time of the acceleration resulting from such
Event of Default. However, Monsanto shall remain liable for such payments.

Modification of the Indenture and Waiver of Covenants

   The indenture contains provisions permitting Monsanto and the trustee, with
the consent of the Holders of not less than a majority in principal amount of
outstanding debt securities of each series affected thereby, to execute
supplemental indentures adding any provisions to or changing or eliminating any
of the provisions of the indenture or modifying the rights of the Holders of
outstanding debt securities of such series, except that no such supplemental
indenture may, without the consent of the Holder of each outstanding debt
security affected thereby:

  .  change the stated maturity, or reduce the principal amount, the premium,
     if any, thereon or the rate of payment of interest thereon, of any debt
     security of any series;

  .  reduce the aforesaid percentage of outstanding debt securities of any
     series, the consent of the Holders of which is required for any
     supplemental indenture or for waiver of compliance with certain
     provisions of the indenture or certain defaults thereunder; or

  .  effect certain other changes. (Section 902)

   The indenture also permits Monsanto to omit compliance with certain
covenants in the indenture with respect to debt securities of any series upon
waiver by the Holders of a majority in principal amount of outstanding debt
securities of such series.

Consolidation, Merger and Sale of Assets

   The indenture contains a provision permitting Monsanto, without the consent
of the Holders of any of the outstanding debt securities under the indenture,
to consolidate with or merge into any other corporation or transfer or lease
its assets substantially as an entirety to any person provided that:

  .  the successor is a corporation organized under the laws of any domestic
     jurisdiction;

  .  the successor corporation assumes Monsanto's obligations on the debt
     securities and under the indenture;

  .  after giving effect to the transaction, no Event of Default, and no
     event which, after notice or lapse of time, would become an Event of
     Default, shall have happened and be continuing; and

  .  certain other conditions are met. (Sections 801 and 802)

Concerning the Trustee

   The Bank of New York is the trustee under the indenture. The trustee is one
of a number of banks with which Monsanto and its subsidiaries maintain ordinary
banking and trust relationships. The trustee also serves as trustee or paying
agent under certain indentures pursuant to which Monsanto or its subsidiaries
have issued industrial revenue bonds, in an aggregate original principal amount
of approximately $137 million.

Governing Law

   The indenture for the debt securities and the debt securities, including the
registered debt, will be governed by New York law.

Global Securities

   The outstanding debt is, and the registered debt will be, issued in the form
of one or more global certificates, known as "global securities." The global
securities will be deposited on the date of the acceptance

                                       22
<PAGE>

for exchange of the outstanding debt and the issuance of the registered debt
with, or on behalf of, DTC and registered in the name of Cede & Co., as DTC's
nominee.

   Registered debt that is issued as described below under "Certificated
Securities" will be issued in the form of registered definitive certificates,
known as "certificated securities." Upon the transfer of certificated
securities, such certificated securities may, unless the global securities have
previously been exchanged for certificated securities, be exchanged for an
interest in the global securities representing the principal amount of
registered debt being transferred.

   Persons holding interests in the global securities may hold their interests
directly through DTC, or indirectly through organizations which are
participants in DTC. Transfers between participants will be effected in the
ordinary way in accordance with DTC rules and will be settled in immediately
available funds.

   Persons who are not participants may beneficially own interests in global
securities held by DTC only through participants or certain banks, brokers,
dealers, trust companies and other parties that clear through or maintain a
custodial relationship with a participant, either directly or indirectly, and
have indirect access to the DTC system. So long as Cede & Co., as DTC's
nominee, is the registered owner of any global security, it will be considered
the sole holder of such global security for all purposes. Except as provided
below, owners of beneficial interests in a global security will not be entitled
to have certificates registered in their names, will not receive or be entitled
to receive physical delivery of certificates in definitive form, and will not
be considered the holder thereof.

   None of Monsanto, the trustee nor any registrar or paying agent will have
any responsibility for the performance by DTC or its participants or indirect
participants of their respective obligations under the rules and procedures
governing their operations. DTC has advised Monsanto that it will take any
action permitted to be taken by a holder of registered debt only at the
direction of one or more participants whose accounts are credited with DTC
interests in a global security.

   DTC has advised Monsanto as follows: DTC is a limited purpose trust company
organized under the laws of the State of New York, a "banking organization"
within the meaning of the New York Banking Law, a member of the Federal Reserve
System, a "clearing corporation" within the meaning of the New York Uniform
Commercial Code and a "clearing agency" registered pursuant to the provisions
of Section 17A of the Exchange Act. DTC was created to hold securities for its
participants and to facilitate the clearance and settlement of securities
transactions, such as transfers and pledges, among participants in deposited
securities through electronic book-entry changes to accounts of its
participants, thereby eliminating the need for physical movement of securities
certificates. Participants include securities brokers and dealers, banks, trust
companies, clearing corporations and certain other organizations. Certain of
such participants or their representatives, together with other entities, own
DTC. The rules applicable to DTC and its participants are on file with the SEC.

   Purchases of registered debt under the DTC system must be made by or through
participants, which will receive a credit for the registered debt on DTC's
records. The ownership interest of each actual purchaser of registered debt,
referred to as a "beneficial owner," is in turn to be recorded on the
participants' and indirect participants' records. Beneficial owners will not
receive written confirmation from DTC of their purchase, but beneficial owners
are expected to receive written confirmations providing details of the
transaction, as well as periodic statements of their holdings, from the
participant or indirect participant through which the beneficial owner entered
into the transaction. Transfers of ownership interests in the registered debt
are to be accomplished by entries made on the books of participants acting on
behalf of beneficial owners. Beneficial owners will not receive certificates
representing their ownership interests in registered debt, except in the event
that use of the book-entry system for the registered debt is discontinued.

   The deposit of registered debt with DTC and their registration in the name
of Cede & Co. effect no change in beneficial ownership. DTC has no knowledge of
the actual beneficial owners of the registered debt; DTC's

                                       23
<PAGE>

records reflect only the identity of the participants to whose accounts such
registered debt is credited, which may or may not be the beneficial owners. The
participants will remain responsible for keeping account of their holdings on
behalf of their customers.

   The laws of some jurisdictions require that certain purchasers of securities
take physical delivery of securities in definitive form. Such laws may impair
the ability to transfer beneficial interests in the global security.

   Conveyance of notices and other communications by DTC to participants, by
participants to indirect participants and by participants and indirect
participants to beneficial owners will be governed by arrangements among them,
subject to any statutory or regulatory requirements that may be in effect from
time to time. Redemption notices shall be sent to Cede & Co. If less than all
of the registered debt is being redeemed, DTC's practice is to determine by lot
the interest of each participant in such registered debt to be redeemed.

   Principal and interest payments on the registered debt will be made to DTC
by wire transfer of immediately available funds. DTC's practice is to credit
participants' accounts on the payable date in accordance with their respective
holdings shown on DTC's records unless DTC has reason to believe that it will
not receive payment on the payable date. Payments by participants to beneficial
owners will be governed by standing instructions and customary practices, as is
the case with securities held for the accounts of customers in bearer form or
registered in "street name," and will be the responsibility of such participant
and not of DTC, or Monsanto, subject to any statutory or regulatory
requirements as may be in effect from time to time. Payment of principal and
interest to DTC is Monsanto's responsibility, disbursement of such payments to
participants shall be DTC's responsibility, and disbursement of such payments
to the beneficial owners shall be the responsibility of participants and
indirect participants. Neither Monsanto nor the trustee will have any
responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in the global
securities or for maintaining, supervising or reviewing any records relating to
such beneficial ownership interests.

   DTC may discontinue providing its services as securities depositary with
respect to the registered debt at any time by giving reasonable notice to
Monsanto. In the event that DTC notifies Monsanto that it is unwilling or
unable to continue as depositary for any global security or if at any time DTC
ceases to be a clearing agency registered as such under the Exchange Act when
DTC is required to be so registered to act as such depositary and no successor
depositary shall have been appointed within 90 days of such notification or of
Monsanto becoming aware of DTC's ceasing to be so registered, as the case may
be, certificates for the registered debt will be printed and delivered in
exchange for interests in such global security. Any global security that is
exchangeable pursuant to the preceding sentence shall be exchangeable for
registered debt registered in such names as DTC shall direct. It is expected
that such instructions will be based upon directions received by DTC from its
participants with respect to ownership of beneficial interests in such global
security.

   Monsanto may decide to discontinue use of the system of book-entry transfers
through DTC or a successor securities depositary. In that event, certificates
representing the registered debt will be printed and delivered.

   The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that Monsanto believes to be reliable, but
Monsanto does not take responsibility for the accuracy thereof.

Certificated Securities

   Subject to certain conditions, any person having a beneficial interest in
the global securities may, upon request to the trustee, exchange such
beneficial interest for registered debt in the form of certificated securities.
Upon any such issuance, the trustee is required to register such certificated
securities in the name of, and cause the same to be delivered to, such person
or persons, or their nominee, if applicable. In addition, if (1) Monsanto
notifies the trustee in writing that DTC is no longer willing or able to act as
a depositary and Monsanto is

                                       24
<PAGE>

unable to locate a qualified successor within 90 days or (2) Monsanto, at its
option, notifies the trustee in writing that it elects to cause the issuance of
registered debt in the form of certificated securities under the indenture,
then, upon surrender by Cede & Co., or its nominee, of global securities,
registered debt in such form will be issued to each person that Cede & Co., or
its nominee, and DTC identify as being the beneficial owner of the related
registered debt.

   Neither Monsanto nor the trustee will be liable for any delay by Cede & Co.,
or its nominee, or DTC in identifying the beneficial owners of registered debt
and Monsanto and the trustee may conclusively rely on, and will be protected in
relying on, instructions from Cede & Co., or its nominee, or DTC for all
purposes.

Year 2000

   The following information has been provided by DTC:

   DTC management is aware that some computer applications, systems, and the
like for processing data that are dependent upon calendar dates, including
dates before, on, and after January 1, 2000, may encounter "Year 2000
problems." DTC has informed its participants and other members of the financial
community that it has developed and is implementing a program so that its
computer systems, as the same relate to the timely payment of distributions
(including principal and income payments) to securityholders, book-entry
deliveries, and settlement of trades within DTC, continue to function
appropriately. This program includes a technical assessment and a remediation
plan, each of which is complete. Additionally, DTC's plan includes a testing
phase, which is expected to be completed within appropriate time frames.

   However, DTC's ability to perform properly its services is also dependent
upon other parties, including but not limited to issuers and their agents, as
well as third-party vendors from whom DTC licenses software and hardware, and
third-party vendors on whom DTC relies for information or the provision of
services, including telecommunication and electrical utility service providers,
among others. DTC has informed the financial community that it is contacting,
and will continue to contact, third-party vendors from whom DTC acquires
services to: (1) impress upon them the importance of such services being Year
2000 compliant; and (2) determine the extent of their efforts for Year 2000
remediation and, as appropriate, testing of their services. In addition, DTC is
in the process of developing such contingency plans as it deems appropriate.

   According to DTC, the foregoing information with respect to DTC has been
provided to the Industry for informational purposes only and is not intended to
serve as a representation, warranty, or contract modification of any kind.

Registration Rights; Liquidated Damages

   Monsanto entered into a registration rights agreement with the initial
purchasers, dated December 9, 1998, for the benefit of the holders of the
outstanding debt wherein Monsanto agreed, for the benefit of the holders of the
outstanding debt, (1) to file with the SEC a registration statement, of which
this prospectus forms a part, with respect to the registered debt and (2) to
use its reasonable efforts to cause such exchange offer registration statement
to be declared effective under the Securities Act on or before June 7, 1999. If

  .  because of any change in law or in currently prevailing interpretations
     of the SEC's staff, Monsanto is not permitted to effect the exchange
     offers, or

  .  in the case of any holder that participates in the exchange offers, such
     holder does not receive applicable registered debt on the date of the
     exchange that may be sold without restriction under state and Federal
     securities laws (other than due solely to the status of such holder as
     an affiliate of Monsanto within the meaning of the Securities Act or as
     a broker-dealer),

                                       25
<PAGE>


then in each case, Monsanto will (1) promptly deliver to the holders written
notice thereof and (2) at Monsanto's sole expense (a) as promptly as
practicable, file a shelf registration statement covering resales of the
applicable outstanding debt, (b) use its reasonable efforts to cause the shelf
registration statement to be declared effective under the Securities Act and
(c) use its reasonable efforts to keep effective the shelf registration
statement until the earlier of December 9, 2000, unless Rule 144(k) is amended
to provide a shorter restrictive period, or such time as all of the outstanding
debt or registered debt, as applicable, has been sold thereunder.

   Monsanto will, in the event that a shelf registration statement is filed,
provide to each applicable holder copies of the prospectus that is a part of
the shelf registration statement, notify each such holder when the shelf
registration statement for the outstanding debt or registered debt, as
applicable, has become effective and take certain other actions as are required
to permit unrestricted resales of the outstanding debt. A holder that sells
outstanding debt or registered debt, as applicable, pursuant to the shelf
registration statement will be required to be named as a selling security
holder in the related prospectus and to deliver a prospectus to purchasers,
will be subject to certain of the civil liability provisions under the
Securities Act in connection with such sales and will be bound by the
provisions of the registration rights agreement that are applicable to such a
holder, including certain indemnification rights and obligations.

   The registration rights agreement requires Monsanto to pay liquidated
damages to holders of the outstanding debt from June 8, 1999 until it
consummates the exchange offer. In addition, if Monsanto fails to comply with
certain other provisions of the registration rights agreement, in each case as
described below, then liquidated damages shall become payable in respect of the
outstanding debt as follows:

   In the event that the exchange offer is not consummated or the applicable
shelf registration statement is not declared effective on or prior to July 22,
1999, liquidated damages shall accrue on the applicable outstanding debt from
and including July 23, 1999 at a rate equal to 0.25% per year. The aggregate
amount of liquidated damages payable pursuant to the above provision will in no
event exceed 0.25% per year. Upon the consummation of the applicable exchange
offer or the effectiveness of the applicable shelf registration statement, as
the case may be, after July 22, 1999, the liquidated damages will cease to
accrue.

   If a shelf registration statement is declared effective pursuant to the
foregoing paragraphs and Monsanto fails to keep it continuously (1) effective
or (2) useable for resales for the period required by the registration rights
agreement due to certain circumstances relating to pending corporate
developments, public filings with the SEC and similar events, or because the
prospectus contains an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary in order to make the
statements therein not misleading, and such failure continues for more than 60
days, whether or not consecutive, in any 12-month period (the 61st day being
referred to as the "Default Day"), then liquidated damages shall accrue at a
rate equal to 0.25% per year from the Default Day until the earlier of

  .  the date that the shelf registration statement is again deemed effective
     or is useable,

  .   December 9, 2001, unless Rule 144(k) is amended to provide a shorter
     restrictive period, or

  .  the date as of which all of the applicable outstanding debt is sold
     pursuant to the shelf registration statement.

   Any amounts of liquidated damages due pursuant to the foregoing paragraphs
will be payable in cash on June 1 and December 1 of each year to the holders of
record on the preceding May 15 and November 15, respectively.

   The registration rights agreement is governed by, and construed in
accordance with, the laws of the State of New York. This summary of certain
provisions of the registration rights agreement is not complete and is subject
to, and is qualified in its entirety by reference to, all the provisions of the
registration rights agreement. In addition, the information set forth above
concerning certain interpretations of and positions taken by the SEC's staff is
not intended to constitute legal advice, and holders of outstanding debt should
consult their own legal advisors with respect to such matters.

                                       26
<PAGE>

                     UNITED STATES FEDERAL TAX CONSEQUENCES

   The following is a discussion of the material United States federal tax
consequences associated with the exchange of the outstanding debt for the
registered debt pursuant to the exchange offer and disposition of the
registered debt. This discussion applies only to a beneficial owner of
registered debt who acquired outstanding debt at the initial offering from
Salomon Smith Barney Inc. and Goldman, Sachs & Co. for the original offering
price thereof and who acquires the registered debt pursuant to the exchange
offer. This discussion is based upon the United States federal tax law now in
effect, which is subject to change, possibly retroactively. This discussion
does not consider any specific facts or circumstances that may apply to a
particular holder. Prospective investors are urged to consult their tax
advisors regarding the United States federal tax consequences of acquiring,
holding, and disposing of the registered debt, as well as any tax consequences
that may arise under the laws of any foreign, state, local, or other taxing
jurisdiction.

   For purposes of this discussion, a "U.S. holder" means a holder of
registered debt that is either a citizen or resident of the United States, a
corporation, partnership, or other entity created or organized in the United
States or under the laws of the United States or of any political subdivision
thereof, an estate whose income is includible in gross income for United States
federal income tax purposes regardless of its source, or a trust whose
administration is subject to the primary supervision of a United States court
and for which one or more United States persons have the authority to control
all substantial decisions of the trust. A "non-U.S. holder" is a holder of
registered debt other than a U.S. holder.

Exchange Offer

   The exchange of outstanding debt for registered debt pursuant to the
exchange offer will not constitute a "significant modification" of the
outstanding debt for United States federal income tax purposes and,
accordingly, the registered debt received will be treated as a continuation of
the outstanding debt in the hand of such holder. As a result, there will be no
United States federal income tax consequences to a U.S. holder who exchanges
outstanding debt for registered debt pursuant to the exchange offer, and any
such holder will have the same adjusted tax basis and holding period in the
registered debt for United States federal income tax purposes as it had in the
outstanding debt immediately before the exchange.

Stated Interest

   The holders of registered debt will include stated interest in gross income
in accordance with their methods of accounting for tax purposes (including
accrued, unpaid interest on the outstanding debt to the date of the issuance of
the registered debt).

Disposition

   A holder of registered debt will recognize gain or loss upon the sale,
exchange, redemption or other taxable disposition of the registered debt
measured by the difference between (1) the amount of cash and fair market value
of property received (that is not attributable to accrued interest which has
not yet been recognized as gross income) and (2) the holder's adjusted tax
basis in the registered debt. Any such gain or loss will be long-term capital
gain or loss, provided the registered debt was a capital asset in the hands of
the holder and had been held for more than one year.

Non-U.S. Holders

   Under present United States federal income and estate tax law, assuming
certain certification requirements are satisfied (which include identification
of the beneficial owner of the instrument), and subject to the discussion of
backup withholding below:

     (1) payments of interest on the registered debt to any non-U.S. holder
  will not be subject to United States federal income or withholding tax,
  provided that (a) the holder does not actually or constructively own 10% or
  more of the total combined voting power of all classes of stock of Monsanto
  entitled to vote,

                                       27
<PAGE>

  (b) the holder is not (i) a bank receiving interest pursuant to a loan
  agreement entered into in the ordinary course of its trade or business or
  (ii) a controlled foreign corporation that is related to Monsanto through
  stock ownership, and (c) such interest payments are not effectively
  connected with the conduct of a United States trade or business of the
  holder;

     (2) a holder of registered debt who is a non-U.S. holder will not be
  subject to the United States federal income tax on gain realized on the
  sale, exchange, or other disposition of registered debt, unless (a) such
  holder is an individual who is present in the United States for 183 days or
  more during the taxable year and certain other requirements are met, or (b)
  the gain is effectively connected with the conduct of a United States trade
  or business of the holder; and

     (3) if interest on the registered debt is exempt from withholding of
  United States federal income tax under the rules described above (without
  regard to the certification requirement), the registered debt will not be
  included in the estate of a deceased non-U.S. holder for United States
  Federal estate tax purposes.

   The certification referred to above may be made on an Internal Revenue
Service Form W-8 or a substantially similar substitute form.

Information Reporting and Backup Withholding

   Monsanto will, where required, report to the holders of registered debt and
the Internal Revenue Service the amount of any interest paid on the registered
debt in each calendar year and the amounts of federal tax withheld, if any,
with respect to such payments. A noncorporate U.S. holder may be subject to
information reporting and to backup withholding at a rate of 31% with respect
to payments of principal and interest made on registered debt, or on proceeds
of the disposition of registered debt before maturity, unless such U.S. holder
provides a correct taxpayer identification number or proof of an applicable
exemption, and otherwise complies with applicable requirements of the
information reporting and backup withholding rules.

   Under temporary United States Treasury regulations, United States
information reporting requirements and backup withholding tax will generally
not apply to interest paid on the registered debt to a non-U.S. holder at an
address outside the United States. Payments by a United States office of a
broker of the proceeds of a sale of the registered debt are subject to both
backup withholding at a rate of 31% and information reporting unless the holder
certifies its non-U.S. holder status under penalties of perjury and provides
its name and address or otherwise establishes an exemption. Information
reporting requirements (but not backup withholding) will also apply to payments
of the proceeds of sales of the registered debt by foreign offices of United
States brokers, or foreign brokers with certain types of relationships to the
United States, unless the broker has documentary evidence in its records that
the holder is a non-U.S. holder and certain other conditions are met, or the
holder otherwise establishes an exemption.

   Backup withholding is not an additional tax. Any amount withheld under the
backup withholding rules will be refunded or credited against the non-U.S.
holder's United States Federal income tax liability, provided that the required
information is furnished to the Internal Revenue Service.

New Treasury Regulations Applicable to Non-U.S. Holders

   On October 6, 1997, the United States Treasury Department issued final
Treasury regulations governing information reporting and the certification
procedures regarding withholding and backup withholding on certain amounts paid
to non-U.S. holders after December 31, 1999. The new Treasury regulations
modify and, in general, unify the way in which non-U.S. holders may establish
eligibility for United States federal withholding tax exemptions, including
that under a tax treaty, and an exemption from backup withholding.

   For example, the new Treasury regulations will require new forms, which non-
U.S. holders will generally have to provide earlier than you would have had to
provide replacements for expiring existing forms. The new Treasury regulations
also clarify the standards upon which withholding agents of non-U.S. holders
may rely, add requirements in order for non-U.S. holders to claim reduced
federal tax withholding under a tax treaty, and provide different procedures in
order for foreign intermediaries and flow-through entities (such as foreign
partnerships) to claim the benefit of applicable exemptions if they receive
payments on behalf of non-U.S. holders.

   The new Treasury regulations are particularly complex. Non-U.S. holders
should consult their tax advisors concerning the effect, if any, of such new
Treasury regulations on their investment in the registered debt.

                                       28
<PAGE>

                              PLAN OF DISTRIBUTION

   Based on existing interpretations of the Securities Act by the SEC's staff
set forth in several no-action letters to third parties, and subject to the
immediately following sentence, Monsanto believes that the registered debt
issued in the exchange offer may be offered for resale, resold and otherwise
transferred by the holders thereof, other than holders who are broker-dealers,
without further compliance with the registration and prospectus delivery
provisions of the Securities Act. However, any purchaser of outstanding debt
who is an affiliate of Monsanto or who intends to participate in the exchange
offer for the purpose of distributing the registered debt, or any broker-dealer
who purchased the outstanding debt from Monsanto to resell pursuant to Rule
144A or any other available exemption under the Securities Act, (1) will not be
able to rely on the interpretations of the SEC's staff set forth in the above-
mentioned no-action letters, (2) will not be entitled to tender its outstanding
debt in the exchange offer and (3) must comply with the registration and
prospectus delivery requirements of the Securities Act in connection with any
sale or transfer of the outstanding debt, unless such sale or transfer is made
pursuant to an exemption from such requirements. Monsanto does not intend to
seek its own no-action letter, and there can be no assurance that the SEC's
staff would make a similar determination with respect to the registered debt as
it has in such no-action letters to third parties.

   Each holder of the outstanding debt, other than certain specified holders,
who wishes to exchange the outstanding debt for registered debt in the exchange
offer is required to represent that:

  .   it is not an affiliate of Monsanto;

  .  the registered debt to be received by it was acquired in the ordinary
     course of its business;

  .  at the time of the exchange offer, it has no arrangement with any person
     to participate in the "distribution," within the meaning of the
     Securities Act, of the registered debt; and

  .  if such holder is not a broker-dealer, it is not engaged in, and does
     not intend to engage in, a "distribution," within the meaning of the
     Securities Act, of the registered debt.

  In addition, in connection with any resales of registered debt, any broker-
dealer who acquired the outstanding debt for its own account as a result of
market-making or other trading activities, referred to in this section as a
"participating broker-dealer," must deliver a prospectus meeting the
requirements of the Securities Act. Based on the position the SEC has taken to
date, Monsanto believes that participating broker-dealers may fulfill their
prospectus delivery requirements with respect to the exchange debt, other than
a resale of an unsold allotment from the original sale of the outstanding debt,
with this prospectus. Under the registration rights agreement, Monsanto is
required to allow participating broker-dealers and other persons, if any,
subject to similar prospectus delivery requirements to use the prospectus in
connection with the resale of such registered debt for a period of 180 days
from the expiration date of the exchange offer.

   Each broker-dealer that receives registered debt for its own account
pursuant to the exchange offer must acknowledge that it will deliver a
prospectus in connection with any resale of such registered debt. This
prospectus, as it may be amended or supplemented from time to time, may be used
by a broker-dealer in connection with resales of registered debt received in
exchange for outstanding debt where such outstanding debt was acquired by such
broker-dealer as a result of market-making activities or other trading
activities. Each broker-dealer agrees that it shall suspend use of this
prospectus upon notice from Monsanto of the occurrence of certain events until
Monsanto has amended or supplemented the prospectus so that it does not contain
any untrue statements or omissions of material facts.

   Monsanto will not receive any proceeds from any sale of registered debt by
broker-dealers. Registered debt received by broker-dealers for their own
account pursuant to the exchange offfer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the registered debt or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or at negotiated prices. Any such
resale may be

                                       29
<PAGE>

made directly to purchasers or to or through brokers or dealers who may receive
compensation in the form of commissions or concessions from any such broker-
dealer and/or the purchasers of any such registered debt. Any broker-dealer
that resells registered debt that was received by it for its own account
pursuant to the exchange offer and any broker or dealer that participates in a
distribution of such registered debt may be deemed to be an "underwriter"
within the meaning of the Securities Act and any profit of any such resale of
registered debt and any commissions or concessions received by any such persons
may be deemed to be underwriting compensation under the Securities Act. Each
letter of transmittal states that by acknowledging that it will deliver and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act.

   For a period of 180 days after the expiration date, Monsanto will promptly
send additional copies of this prospectus and any amendment or supplement to
this prospectus to any broker-dealer that requests such documents in the
applicable letter of transmittal. Monsanto has agreed to pay all expenses
incident to the exchange offer other than commissions or concessions of any
brokers or dealers and will indemnify the holders of the outstanding debt,
including any broker-dealers, against certain liabilities, including
liabilities under the Securities Act.

                      WHERE YOU CAN FIND MORE INFORMATION

   Monsanto files annual, quarterly and special reports, proxy statements and
other information with the SEC. Monsanto's filings with the SEC are available
to the public over the Internet at the SEC's web site at http://www.sec.gov.
You may also read and copy any document Monsanto files with the SEC at the
SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. You may call the SEC at 1-800-SEC-0330 for further
information on the public reference rooms.

   Monsanto's reports, proxy statements and other information may also be
inspected at the offices of the New York Stock Exchange, the exchange on which
certain of Monsanto's securities are listed.

   No person is authorized to give any information or to make any
representations with respect to the matters described in this prospectus other
than those contained herein or in the documents incorporated by reference
herein. Any information or representation with respect to such matters not
contained herein or therein must not be relied upon as having been authorized
by Monsanto. The delivery of this prospectus shall not, under any
circumstances, create any implication that there has been no change in the
affairs of Monsanto since the date hereof or that the information in this
prospectus or in the documents incorporated by reference herein is correct as
of any time subsequent to the date hereof or thereof.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The SEC allows Monsanto to "incorporate by reference" certain information
that Monsanto files with the SEC, which means that Monsanto can disclose
important information to you by referring you to information in those
documents. The information incorporated by reference is an important part of
this prospectus. The following documents and other materials, which Monsanto
has filed with the SEC, are incorporated herein and specifically made a part
hereof by this reference:

     (1) Monsanto's Annual Report on Form 10-K filed with the SEC on March
  25, 1999;

     (2) Monsanto's Quarterly Report on Form 10-Q filed with the SEC on May
  17, 1999; and

     (3) Monsanto's Current Report on Form 8-K/A filed with the SEC on
  February 8, 1999 and Current Reports on Form 8-K filed with the SEC on
  March 1 and May 4, 1999.

   In addition, (1) all documents filed with the SEC pursuant to Section 13(a),
13(c), 14 and 15(d) of the Exchange Act by Monsanto subsequent to the date of
this prospectus and (2) all documents filed with the SEC pursuant to the
Exchange Act after the date of the initial registration statement of which this
prospectus is a

                                       30
<PAGE>

part and prior to the effectiveness of such registration statement shall be
deemed to be incorporated by reference into this prospectus and to be a part
hereof from the date of filing of such documents with the SEC. Any statement
contained herein or in a document incorporated or deemed to be incorporated by
reference herein shall be deemed to be modified or superseded for purposes of
this prospectus to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this prospectus.

   Statements contained in this prospectus or in any document incorporated by
reference in this prospectus as to the contents of any contract or other
document referred to herein or therein are not necessarily complete, and in
each instance reference is made to the copy of such contract or other document
filed as an exhibit to the documents incorporated by reference, each such
statement being qualified in all respects by such reference.

   This prospectus incorporates documents by reference that are not presented
herein or delivered herewith. Copies of such documents, other than exhibits to
such documents that are not specifically incorporated by reference herein, are
available without charge to any person to whom this prospectus is delivered,
upon written or oral request to: Monsanto Company, 800 North Lindbergh
Boulevard, St. Louis, Missouri 63167, Attention: Corporate Secretary,
telephone: (314) 694-1000.

                        VALIDITY OF THE REGISTERED DEBT

   The validity of the registered debt offered hereby will be passed upon for
Monsanto by Winston & Strawn, Chicago, Illinois.

                                    EXPERTS

   The consolidated financial statements incorporated by reference in
Monsanto's Annual Report on Form 10-K for the year ended December 31, 1998 have
been audited by Deloitte & Touche LLP, independent auditors, as stated in their
report, which is incorporated herein by reference, and have been so
incorporated herein in reliance upon such report of such firm given upon their
authority as experts in accounting and auditing.

   The consolidated financial statements of DEKALB Genetics Corporation and
subsidiaries incorporated by reference in this prospectus and elsewhere in the
registration statement have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their report with respect thereto, and are
included herein in reliance upon the authority of said firm as experts in
giving said report.

                                       31
<PAGE>

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

                                Monsanto Company

                               Exchange Offer for

                       $500,000,000 5.375% Notes due 2001
                       $600,000,000 5.750% Notes due 2005
                       $200,000,000 5.875% Notes due 2008
                    $500,000,000 6.500% Debentures due 2018
                    $700,000,000 6.600% Debentures due 2028

                                [Monsanto logo]

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

                                   PROSPECTUS

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

                                         , 1999

   Until               , all dealers that effect transactions in these
securities, whether or not participating in this offering, may be required to
deliver a prospectus. This is in addition to the dealers' obligation to deliver
a prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS

   Section 145 of the General Corporation Law of the State of Delaware permits
indemnification of directors, officers, employees and agents of corporations
under certain conditions and subject to certain limitations. Section 59 of the
Company's By-Laws provides for indemnification of any director, officer,
employee or agent of the Company, or any person serving in the same capacity in
any other enterprise at the request of the Company, under certain
circumstances. Article IX of the Company's Restated Certificate of
Incorporation eliminates the liability of directors of the Company under
certain circumstances for breaches of fiduciary duty to the Company and its
shareholders.

   The Company maintains directors' and officers' liability insurance coverage.

ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

   The following documents are filed herewith or incorporated herein by
reference.

<TABLE>
<CAPTION>
 Exhibit
 Number                          Description of Exhibits
 -------                         -----------------------
 <C>     <S>
 3.1*    Restated Certificate of Incorporation of the Company as of October 28,
         1997 (incorporated herein by reference to Exhibit 3(i) of the
         Company's Form 10-Q for the quarter ended September 30, 1997)

 3.2     By-Laws of the Company, as amended effective June 25, 1999

 4.1*    Indenture dated as of December 1, 1998 between the Company and The
         Bank of New York as Trustee, providing for Issuance of Debt Securities
         in Series (incorporated herein by reference to Exhibit 4.7 of the
         Company's Current Report on Form 8-K as filed with the Commission on
         December 14, 1998)

 4.2*    Form of Officer's Certificate, establishing the terms of the Company's
         5.375% Notes due 2001, 5.750% Notes due 2005, 5.875% Notes due 2008,
         6.500% Debentures due 2018 and 6.600% Debentures due 2028

 4.3*    Registration Rights Agreement, dated as of December 9, 1998, by and
         among the Company, Salomon Smith Barney Inc. and Goldman, Sachs & Co.

 5.1*    Opinion of Winston & Strawn

 12.1*   Computation of Ratios of Earnings to Fixed Charges (for last five
         fiscal years) (incorporated herein by reference to Exhibit 99 of the
         Company's Form 10-Q for the quarter ended March 31, 1999)

 23.1*   Consent of Deloitte & Touche LLP

 23.2*   Consent of Winston & Strawn (included in Exhibit 5.1)

 23.3*   Consent of Arthur Andersen LLP

 24.1*   Powers of Attorney

 24.2    Powers of Attorney

 25.1*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.375% Notes due 2001

 25.2*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.750% Notes due 2005
</TABLE>

                                      II-1
<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number                        Description of Exhibits
 -------                       -----------------------
 <C>     <S>
 25.3*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.875% Notes due 2008

 25.4*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 6.500% Debentures due 2018

 25.5*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 6.600% Debentures due 2028

 99.1*   Form of Letter of Transmittal

 99.2*   Form of Notice of Guaranteed Delivery

 99.3*   Form of Tender Instructions
</TABLE>
- --------
  *Previously filed.

ITEM 22. UNDERTAKINGS

   (1) The Company hereby undertakes that, for purposes of determining any
liability under the Securities Act of 1933 (the "Securities Act"), each filing
of the Company's annual report pursuant to Section 13(a) or Section 15(d) of
the Securities Exchange Act of 1934 (the "Exchange Act")(and, where applicable,
each filing of an employee benefit plan's annual report pursuant to Section
15(d) of the Exchange Act) that is incorporated by reference in the
Registration Statement shall be deemed to be a new Registration Statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

   (2) The Company hereby undertakes to respond to requests for information
that is incorporated by reference into the Prospectus pursuant to Items 4,
10(b), 11, or 13 of Form S-4, within one business day of receipt of such
request, and to send the incorporated documents by first class mail or other
equally prompt means. This includes information contained in documents filed
subsequent to the effective date of the Registration Statement through the date
of responding to the request.

   (3) The Company hereby undertakes to supply by means of a post-effective
amendment all information concerning a transaction, and the company being
acquired involved therein, that was not the subject of and included in the
Registration Statement when it became effective.

   (4) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Company pursuant to the foregoing provisions, or otherwise, the Company has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Company will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

                                      II-2
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, Monsanto Company
certifies that it has duly caused this Amendment No. 2 to the Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of St. Louis, State of Missouri, on July 28, 1999.

                                          Monsanto Company

                                            /s/ Gary L. Crittenden
                                          By: _________________________________
                                          Name: Gary L. Crittenden
                                          Title:Senior Vice President and
                                          Chief Financial Officer (Principal
                                          Financial Officer)

   Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 2 to the Registration Statement has been signed by the following persons in
the capacities indicated on the dates indicated:

<TABLE>
<CAPTION>
             Signature                           Title                    Date
             ---------                           -----                    ----
<S>                                  <C>                           <C>
                 *                   Chairman and Director           July 28, 1999
____________________________________ (Principal Executive
         Robert B. Shapiro           Officer)

     /s/ Gary L. Crittenden          Senior Vice President and       July 28, 1999
____________________________________ Chief Financial Officer
         Gary L. Crittenden          (Principal Financial
                                     Officer)

                 *                   Vice President and              July 28, 1999
____________________________________ Controller (Principal
          Richard B. Clark           Accounting Officer)

                 *                   Director                        July 28, 1999
____________________________________
       Richard U. De Schutter

                 *                   Director                        July 28, 1999
____________________________________
           Michael Kantor

                 *                   Director                        July 28, 1999
____________________________________
         Gwendolyn S. King

                 *                   Director                        July 28, 1999
____________________________________
            Philip Leder

                 *                   Director                        July 28, 1999
____________________________________
        Jacobus F. M. Peters

                 *                   Director                        July 28, 1999
____________________________________
            John S. Reed

                 *                   Director                        July 28, 1999
____________________________________
           John E. Robson

                 *                   Director                        July 28, 1999
____________________________________
       William D. Ruckelshaus

                 *                   Director                        July 28, 1999
____________________________________
       Hendrik A. Verfaillie
</TABLE>

* Sonya M. Davis, by signing her name hereto, does sign this document on behalf
of the above noted individuals, pursuant to powers of attorney duly executed by
such individuals which have been filed as an Exhibit to this Registration
Statement.

                                                 /s/ Sonya M. Davis
                                          -------------------------------------

                                                   Sonya M. Davis
                                                    Attorney-in-Fact

                                      II-3
<PAGE>

                                 EXHIBIT INDEX

   The following documents are filed herewith or incorporated herein by
reference.

<TABLE>
<CAPTION>
 Exhibit
 Number                          Description of Exhibits
 -------                         -----------------------
 <C>     <S>
  3.1*   Restated Certificate of Incorporation of the Company as of October 28,
         1997 (incorporated herein by reference to Exhibit 3(i) of the
         Company's Form 10-Q for the quarter ended September 30, 1997)

  3.2    By-Laws of the Company, as amended effective June 25, 1999

  4.1*   Indenture dated as of December 1, 1998 between the Company and The
         Bank of New York as Trustee, providing for Issuance of Debt Securities
         in Series (incorporated herein by reference to Exhibit 4.7 of the
         Company's Current Report on Form 8-K as filed with the Commission on
         December 14, 1998)

  4.2*   Form of Officer's Certificate, establishing the terms of the Company's
         5.375% Notes due 2001, 5.750% Notes due 2005, 5.875% Notes due 2008,
         6.500% Debentures due 2018 and 6.600% Debentures due 2028

  4.3*   Registration Rights Agreement, dated as of December 9, 1998, by and
         among the Company, Salomon Smith Barney Inc. and Goldman, Sachs & Co.

  5.1*   Opinion of Winston & Strawn

 12.1*   Computation of Ratios of Earnings to Fixed Charges (for last five
         fiscal years) (incorporated herein by reference to Exhibit 99 of the
         Company's Form 10-Q for the quarter ended March 31, 1999)

 23.1*   Consent of Deloitte & Touche LLP

 23.2*   Consent of Winston & Strawn (included in Exhibit 5.1)

 23.3*   Consent of Arthur Andersen LLP

 24.1*   Powers of Attorney

 24.2    Powers of Attorney

 25.1*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.375% Notes due 2001

 25.2*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.750% Notes due 2005

 25.3*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 5.875% Notes due 2008

 25.4*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 6.500% Debentures due 2018

 25.5*   Form T-1 Statement of Eligibility under the Trust Indenture Act of
         1939 of The Bank of New York relating to the Indenture and the
         issuance of the Company's 6.600% Debentures due 2028

 99.1*   Form of Letter of Transmittal

 99.2*   Form of Notice of Guaranteed Delivery

 99.3*   Form of Tender Instructions

</TABLE>

- --------
 * Previously filed.

                                      II-4

<PAGE>

                                                                     Exhibit 3.2


                               MONSANTO COMPANY

                                    BY-LAWS

                            As adopted June 25, 1999


                                    OFFICES
                                    -------

1.   Registered

  The name of the registered agent of the Company is Corporation Service Company
and the registered office of the Company shall be located in the City of
Wilmington, County of New Castle, State of Delaware.

2.   Other

  The Company shall have its General Offices in the County of St. Louis, State
of Missouri, and may also have offices at such other places both within or
without the State of Delaware as the Board of Directors may from time to time
designate or the business of the Company may require.

                             STOCKHOLDERS' MEETINGS
                             ----------------------

3.  Annual Meeting

  An annual meeting of stockholders shall be held on such day and at such time
as may be designated by the Board of Directors for the purpose of electing
Directors and for the transaction of such other business as properly may come
before such meeting. Any previously scheduled annual meeting of the stockholders
may be postponed by resolution of the Board of Directors upon public notice
given on or prior to the date previously scheduled for such annual meeting of
stockholders.

4.  Business to be Conducted at Annual Meeting

    (a) At an annual meeting of stockholders, only such business shall be
conducted as shall have been brought before the meeting (i) pursuant to the
Company's notice of the meeting, (ii) by or at the direction of the Board of
Directors or (iii) by any stockholder of the Company who is a stockholder of
record at the time of giving of the notice provided for in this By-Law, who
shall be entitled to vote at such meeting and who shall have complied with the
notice procedures set forth in this By-Law.

    (b) For business to be properly brought before an annual meeting by a
stockholder pursuant to Section (a)(iii) of this By-Law, notice in writing must
be delivered or mailed to the Secretary and received at the General Offices of
the Company, not less than 90 days nor more than 120 days prior to the first
anniversary of the preceding year's annual meeting; provided, however, that in
the event that the date of the meeting is advanced by more than 30 days or
delayed by more than 60 days from such anniversary date, notice by the
stockholder must be received not earlier than
<PAGE>

the 120th day prior to such annual meeting and not later than the close of
business on the later of the 90th day prior to such annual meeting or the tenth
day following the day on which public announcement of the date of the annual
meeting is first made. Such stockholder's notice shall set forth as to each
matter the stockholder proposes to bring before the annual meeting (i) a brief
description of the business to be brought before the annual meeting and the
reasons for conducting such business at such meeting; (ii) the name and address,
as they appear on the Company's books, of the stockholder proposing such
business, and the name and address of the beneficial owner, if any, on whose
behalf the proposal is made; (iii) the class and number of shares of the
Company's stock which are beneficially owned by the stockholder, and by the
beneficial owner, if any, on whose behalf the proposal is made; and (iv) any
material interest of the stockholder, and of the beneficial owner, if any, on
whose behalf the proposal is made, in such business. For purposes of these By-
Laws, "public announcement" shall mean disclosure in a press release reported by
the Dow Jones News Service, Associated Press or comparable news service or in a
document publicly filed by the Company with the Securities and Exchange
Commission pursuant to Section 13, 14 or 15(b) of the Securities Exchange Act of
1934, as amended.

     (c) Notwithstanding anything in these By-Laws to the contrary, no business
shall be conducted at an annual meeting except in accordance with the procedures
set forth in this By-Law. The chairman of the meeting may, if the facts warrant,
determine that the business was not properly brought before the meeting in
accordance with the provisions of this By-Law; and if the chairman should so
determine, the chairman shall so declare to the meeting, and any such business
not properly brought before the meeting shall not be transacted. Notwithstanding
the foregoing provisions of this By-Law, a stockholder shall also comply with
all applicable requirements of the Securities Exchange Act of 1934, as amended,
(the "Exchange Act") and the rules and regulations thereunder with respect to
the matters set forth in this By-Law. Nothing in this By-Law shall be deemed to
affect any rights of stockholders to request inclusion of proposals in the
Company's proxy statement pursuant to Rule 14a-8 under the Exchange Act. The
provision of this Section 4 shall also govern what constitutes timely notice for
purposes of Rule 14a-4(c) of the Exchange Act.

5.  Special Meetings

  Special meetings of stockholders, unless otherwise provided by the law of
Delaware, may be called by the Chairman of the Board or the President, or
pursuant to resolution of the Board of Directors, and such person calling the
meeting shall have the sole right to determine the proper purpose or purposes of
such meeting.  Business transacted at a special meeting of stockholders shall be
confined to the purpose or purposes of the meeting as stated in the notice of
such meeting. Any previously scheduled special meeting of the stockholders may
be postponed by resolution of the Board of Directors upon notice by public
announcement given on or prior to the date previously scheduled for such special
meeting of stockholders.

                                       2
<PAGE>

6.   Place of Meetings

     All meetings of stockholders shall be held at the General Offices of the
Company in the County of St. Louis, State of Missouri, unless otherwise
determined by resolution of the Board of Directors.

7.   Notice of Meetings

     Except as otherwise required by the law of Delaware, notice of each meeting
of the stockholders, whether annual or special, shall, at least ten days but not
more than sixty days before the date of the meeting, be given to each
stockholder of record entitled to vote at the meeting by mailing such notice in
the United States mail, postage prepaid, addressed to such stockholder at such
stockholder's address as the same appears on the records of the Company. Such
notice shall state the place, date and hour of the meeting, and in the case of a
special meeting, shall also state the purpose or purposes thereof.

8.   Nominations of Directors

     (a) Only persons who are nominated in accordance with the procedures set
forth in these By-Laws shall be eligible for election as Directors. Nominations
of persons for election to the Board of Directors may be made at a meeting of
stockholders (i) by or at the direction of the Board of Directors or (ii) by any
stockholder of the Company who is a stockholder of record at the time of giving
of the notice provided for in this By-Law, who shall be entitled to vote for the
election of Directors at the meeting and who complies with the notice procedures
set forth in this By-Law.

     (b) Nominations by stockholders shall be made pursuant to notice in
writing, delivered or mailed to the Secretary and received at the General
Offices of the Company (i) in the case of an annual meeting, not less than 60
days nor more than 90 days prior to the first anniversary of the preceding
year's annual meeting, provided, however, that in the event that the date of the
meeting is advanced by more than 30 days or delayed by more than 60 days from
such anniversary date, notice by the stockholder must be received not earlier
than the 90th day prior to such annual meeting and not later than the close of
business on the later of the 60th day prior to such annual meeting or the tenth
day following the day on which public announcement of the date of the meeting is
first made; or (ii) in the case of a special meeting at which directors are to
be elected, not earlier than the 90th day prior to such special meeting and not
later than the close of business on the later of the 60th day prior to such
special meeting or the tenth day following the day on which public announcement
of the date of the meeting and of the nominees proposed by the Board of
Directors to be elected at such meeting is first made. In the case of a special
meeting of stockholders at which Directors are to be elected, stockholders may
nominate a person or persons (as the case may be) for election only to such
position(s) as are specified in the Company's notice of meeting as being up for
election at such meeting. Such stockholder's notice shall set forth (i) as to
each person whom the stockholder proposes to nominate for election or reelection
as a Director, all information relating to such person that would be required to
be disclosed in solicitations of proxies for election of Directors, or is
otherwise required, in each case pursuant to Regulation 14A under the Exchange
Act (including such person's written consent to being named as a nominee and to
serving as a Director if elected);

                                       3
<PAGE>

(ii) as to the stockholder giving the notice, the name and address, as they
appear on the Company's books, of such stockholder and the class and number of
shares of the Company's stock which are beneficially owned by such stockholder;
and (iii) as to any beneficial owner on whose behalf the nomination is made, the
name and address of such person and the class and number of shares of the
Company's stock which are beneficially owned by such person. At the request of
the Board of Directors, any person nominated by the Board of Directors for
election as a Director shall furnish to the Secretary that information required
to be set forth in a stockholder's notice of nomination which pertains to the
nominee. Notwithstanding anything in this By-Law to the contrary, in the event
that the number of directors to be elected to the Board of Directors of the
Company is increased and there is no public statement naming all the nominees
for Director or specifying the size of the increased Board of Directors made by
the Company at least 70 days prior to the first anniversary of the preceding
year's annual meeting, a stockholder's notice required by this By-Law shall also
be considered timely, but only with respect to nominees for any new positions
created by such increase, if it shall be delivered to the Secretary at the
General Offices of the Company not later than the close of business on the 10th
day following the day on which such public announcement is first made by the
Company.

     (c) No person shall be eligible for election as a Director of the Company
unless nominated in accordance with the procedures set forth in these By-Laws.
The chairman of the meeting may, if the facts warrant, determine that a
nomination was not made in accordance with the procedures prescribed in this By-
Law; and if the chairman should so determine, the chairman shall so declare to
the meeting, and the defective nomination shall be disregarded. Notwithstanding
the foregoing provisions of this By-Law, a stockholder shall also comply with
all applicable requirements of the Exchange Act and the rules and regulations
thereunder with respect to the matters set forth in this By-Law.

9.   List of Stockholders

     (a) The Secretary of the Company shall prepare, at least ten days before
each meeting of stockholders, a complete list of the stockholders entitled to
vote at the meeting, arranged in alphabetical order, and showing the address of
each stockholder and the number of shares registered in the name of each
stockholder. Such list shall be open to the examination of any stockholder, for
any purpose germane to the meeting, during ordinary business hours, for a period
of at least ten days prior to the meeting, either at a place within the city
where the meeting is to be held, which place shall be specified in the notice of
the meeting, or, if not so specified, at the place where the meeting is to be
held. The list shall also be produced and kept at the time and place of the
meeting during the whole time thereof, and may be inspected by any stockholder
who is present.

     (b) The stock ledger of the Company shall be the only evidence as to the
identity of the stockholders entitled (i) to vote in person or by proxy at any
meeting of stockholders, or (ii) to exercise the rights in accordance with
Delaware law to examine the stock ledger, the list required by this By-Law or
the books and records of the Company.

                                       4
<PAGE>

10.  Quorum

     The holders of a majority of the stock issued and outstanding and entitled
to vote thereat, present in person or represented by proxy, shall constitute a
quorum for the transaction of any business at all meetings of the stockholders,
except as otherwise provided by the law of Delaware, by the Certificate of
Incorporation or by these By-Laws. The stockholders present at any duly
organized meeting may continue to transact business until adjournment,
notwithstanding the withdrawal of sufficient stockholders to render the
remaining stockholders less than a quorum. Whether or not a quorum is present,
either the Chairman of the meeting or a majority of the stockholders entitled to
vote thereat, present in person or by proxy, shall have power to adjourn the
meeting from time to time, without notice other than announcement at the
meeting. If the adjournment is for more than thirty days, or if after the
adjournment a new record date is fixed for the adjourned meeting, a notice of
the adjourned meeting shall be given to each stockholder of record entitled to
vote at the meeting. At such adjourned meeting at which the requisite amount of
voting stock shall be present or represented, any business may be transacted
which might have been transacted at the meeting as originally noticed.

11.  Voting and Required Vote

     Subject to the provisions of the Certificate of Incorporation, each
stockholder shall, at every meeting of stockholders, be entitled to one vote for
each share of capital stock held by such stockholder.  Subject to the provisions
of the Certificate of Incorporation and Delaware law, Directors shall be chosen
by the vote of a plurality of the shares present in person or represented by
proxy at the meeting; and all other questions shall be determined by the
affirmative vote of the majority of shares present in person or represented by
proxy at the meeting.  Elections of Directors shall be by written ballot.

12.  Proxies

     Each stockholder entitled to vote at a meeting of stockholders may
authorize another person or persons to act for such stockholder by proxy,
provided the instrument authorizing such proxy to act shall have been executed
in writing in the manner prescribed by law. No proxy shall be voted or acted
upon after three years from its date, unless the proxy provides for a longer
period.

13.  Inspectors of Election; Polls

     Before each meeting of stockholders, the Chairman of the Board or another
officer of the Company designated by resolution of the Board of Directors shall
appoint one or more inspectors of election for the meeting and may appoint one
or more inspectors to replace any inspector unable to act.  If any of the
inspectors appointed shall fail to attend, or refuse or be unable to serve,
substitutes shall be appointed by the Chairman of the meeting.  Each inspector
shall have such duties as are provided by law, and shall take and sign an oath
faithfully to execute the duties of inspector with strict impartiality and
according to the best of such person's ability.  The Chairman of the meeting
shall fix and announce at the meeting the date and time of the opening and
closing of the polls for each matter upon which the stockholders will vote at
the meeting.

14.  Organization

                                       5
<PAGE>

     The Chairman of the Board of Directors, or in the Chairman's absence, (i)
the President, if a member of the Board of Directors, (ii) one of the Vice
Chairmen of the Board who is a member of the Board of Directors, if any, in such
order as may be designated by the Chairman of the Board, in that order, or (iii)
in the absence of each of them, a chairman chosen by a majority of the Directors
present, shall act as chairman of the meetings of the stockholders. The order of
business and the procedure at any meeting of stockholders shall be determined by
the chairman of the meeting.

15.  No Stockholder Action by Written Consent

     Any action required or permitted to be taken by the stockholders of the
Company must be effected at a duly called annual or special meeting of
stockholders of the Company and may not be effected by any consent in writing in
lieu of a meeting of such stockholders.

                               BOARD OF DIRECTORS
                               ------------------

16.  General Powers, Number, Term of Office

     The business of the Company shall be managed under the direction of its
Board of Directors. Subject to the rights of the holders of any series of
preferred stock, without par value, of the Company ("Preferred Stock") to elect
additional directors under specified circumstances, the number of directors of
the Company which shall constitute the whole Board shall be not less than five
nor more than 20. The exact number of directors within the minimum and maximum
limitation specified in the preceding sentence shall be fixed from time to time
exclusively by resolution of a majority of the whole Board. The Directors, other
than those who may be elected by the holders of any series of Preferred Stock,
shall be divided into three classes, as nearly equal in number as possible. One
class of directors shall have a term expiring at the annual meeting of
stockholders to be held in 1998, another class shall have a term expiring at the
annual meeting of stockholders to be held in 1999, and another class shall have
a term expiring at the annual meeting of stockholders to be held in 2000.
Members of each class shall hold office until their successors are elected and
qualified. At each annual meeting of the stockholders of the Company commencing
with the 1998 annual meeting, (1) directors elected to succeed those directors
whose terms then expire shall be elected to hold office for a term expiring at
the third succeeding annual meeting of stockholders after their election, with
each director to hold office until his or her successor shall have been duly
elected and qualified, and (2) only if authorized by a resolution of the Board
of Directors, directors may be elected to fill any vacancy on the Board of
Directors, regardless of how such vacancy shall have been created. Directors
need not be stockholders of the Company or residents of the State of Delaware.

17.  Vacancies

     Subject to the rights of the holders of any series of Preferred Stock to
elect additional directors under specified circumstances, and unless the Board
of Directors otherwise determines, vacancies resulting from death, resignation,
retirement, disqualification, removal from office or

                                       6
<PAGE>

other cause, and newly created directorships resulting from any increase in the
authorized number of directors, may be filled only by the affirmative vote of a
majority of the remaining directors, though less than a quorum of the Board of
Directors, or by a sole remaining director, and directors so chosen shall hold
office for a term expiring at the annual meeting of stockholders at which the
term of office of the class to which they have been elected expires and until
such director's successor shall have been duly elected and qualified. No
decrease in the number of authorized directors constituting the Board of
Directors shall shorten the term of any incumbent director.

18.  Regular Meetings

     Following the annual meeting of stockholders, the first meeting of each
newly elected Board of Directors may be held, without notice, on the same day
and at the same place as such stockholders' meeting. The Board of Directors by
resolution may provide for the holding of regular meetings and may fix the times
and places at which such meetings shall be held. Notice of regular meetings
shall not be required provided that whenever the time or place of regular
meetings shall be fixed or changed, notice of such action shall be given
promptly to each director, as provided in Section 19 below, who was not present
at the meeting at which such action was taken.

19.  Special Meetings

     Special meetings of the Board of Directors shall be held whenever called by
the Chairman of the Board of Directors or the President, or in the absence of
each of them, by any Vice Chairman of the Board, in such order as may be
designated by the Chairman of the Board, or by the Secretary at the written
request of a majority of the Directors.

20.  Notices

     Notice of any special meeting of the Board of Directors shall be addressed
to each Director at such Director's residence or business address and shall be
sent to such Director by mail, electronic mail, telecopier, telegram or telex or
telephoned or delivered to such Director personally. If such notice is sent by
mail, it shall be sent not later than three days before the day on which the
meeting is to be held. If such notice is sent by electronic mail, telecopier,
telegram or telex, it shall be sent not later than 12 hours before the time at
which the meeting is to be held. If such notice is telephoned or delivered
personally, it shall be received not later than 12 hours before the time at
which the meeting is to be held. Such notice shall state the time, place and
purpose or purposes of the meeting.

21.  Quorum

     One-third of the total number of Directors constituting the whole Board,
but not less than two, shall constitute a quorum for the transaction of business
at any meeting of the Board of Directors, but if less than such required number
of Directors for a quorum is present at a meeting, a majority of the Directors
present may adjourn the meeting from time to time without further notice. Except
as otherwise specifically provided by the law of Delaware, the Certificate of
Incorporation

                                       7
<PAGE>

or these By-Laws, the act of a majority of the Directors present at a meeting at
which a quorum is present shall be the act of the Board of Directors.

22.  Organization

     At each meeting of the Board of Directors, the Chairman of the Board or, in
the Chairman's absence, (i) the President, if a member of the Board of
Directors, (ii) one of the Vice Chairmen of the Board who is a member of the
Board of Directors, if any, in such order as may be designated by the Chairman
of the Board, in that order, or (iii) in the absence of each of them, a chairman
chosen by a majority of the Directors present, shall act as chairman of the
meeting, and the Secretary or, in the Secretary's absence, an Assistant
Secretary or any employee of the Company appointed by the chairman of the
meeting, shall act as secretary of the meeting.

23.  Resignations

     Any Director may resign at any time by giving written notice to the
Chairman of the Board, the President or the Secretary of the Company. Such
resignation shall take effect upon receipt thereof or at any later time
specified therein; and, unless otherwise specified therein, the acceptance of
such resignation shall not be necessary to make it effective.

24.  Removal

     Subject to the rights of the holders of any series of Preferred Stock to
elect additional directors under specified circumstances, any director may be
removed from office at any time, but only for cause and only by the affirmative
vote of the holders of at least 80 percent of the voting power of the then
outstanding Voting Stock, voting together as a single class. For purposes of
these By-Laws, "Voting Stock" shall mean the outstanding shares of capital stock
of the Company entitled to vote generally in the election of directors.

25.  Action Without a Meeting

     Unless otherwise restricted by the Certificate of Incorporation or these
By-Laws, any action required or permitted to be taken at any meeting of the
Board of Directors or of any committee thereof may be taken without a meeting if
all members of the Board or committee, as the case may be, consent thereto in
writing, and the writing or writings are filed with the minutes of proceedings
of the Board or committee.

26.  Location of Books

     Except as otherwise provided by resolution of the Board of Directors and
subject to the law of Delaware, the books of the Company may be kept at the
General Offices of the Company and at such other places as may be necessary or
convenient for the business of the Company.

27.  Dividends

                                       8
<PAGE>

     Subject to the provisions of the Certificate of Incorporation and the law
of Delaware, dividends upon the capital stock of the Company may be declared by
the Board of Directors at any regular or special meeting. Dividends may be paid
in cash, in property, or in shares of the Company's capital stock.

28.  Compensation of Directors

     Directors shall receive such compensation and benefits as may be determined
by resolution of the Board for their services as members of the Board and
committees. Directors shall also be reimbursed for their expenses of attending
Board and committee meetings. Nothing contained herein shall preclude any
Director from serving the Company in any other capacity and receiving
compensation therefor.

29.  Additional Powers

     In addition to the powers and authorities by these By-Laws expressly
conferred upon it, the Board of Directors may exercise all such powers of the
Company and do all such lawful acts and things as are not by statute or by the
Certificate of Incorporation or by these By-Laws directed or required to be
exercised or done by the stockholders.

                            COMMITTEES OF DIRECTORS
                            -----------------------

30.  Designation, Power, Alternate Members

     The Board of Directors may, by resolution or resolutions passed by a
majority of the whole Board, designate an Executive Committee and one or more
additional committees, each committee to consist of two or more of the Directors
of the Company. Any such committee, to the extent provided in said resolution or
resolutions and subject to any limitations provided by law, shall have and may
exercise the powers of the Board of Directors in the management of the business
and affairs of the Company. The Board of Directors may designate one or more
Directors as alternate members of any committee, who may replace any absent or
disqualified member at any meeting of the committee. If at a meeting of any
committee one or more of the members thereof is absent or disqualified, and if
either the Board of Directors has not so designated any alternate member or
members, or the number of absent or disqualified members exceeds the number of
alternate members who are present at such meeting, then the member or members of
such committee (including alternates) present at any meeting and not
disqualified from voting, whether or not they constitute a quorum, may
unanimously appoint another Director to act at the meeting in the place of such
absent or disqualified member. The term of office of the members of each
committee shall be as fixed from time to time by the Board; provided, however,
that any committee member who ceases to be a member of the Board shall
automatically cease to be a committee member.

31.  Quorum, Manner of Acting

     At any meeting of a committee, the presence of one-third, but not less than
two, of its members then in office shall constitute a quorum for the transaction
of business; and the act of a

                                       9
<PAGE>

majority of the members present at a meeting at which a quorum is present shall
be the act of the committee; provided that in the event that any member or
members of the committee is or are in any way interested in or connected with
any other party to a contract or transaction being approved at such meeting, or
are themselves parties to such contract or transaction, the act of a majority of
the members present who are not so interested or connected, or are not such
parties, shall be the act of the committee. Each committee may provide for the
holding of regular meetings, make provision for the calling of special meetings
and, except as otherwise provided in these By-Laws or by resolution of the Board
of Directors, make rules for the conduct of its business.

32.  Minutes

     The committees shall keep minutes of their proceedings and report the same
to the Board of Directors when required; but failure to keep such minutes shall
not affect the validity of any acts of the committee or committees.

                               ADVISORY DIRECTORS
                               ------------------

33.  Advisory Directors

     The Board of Directors may, by resolution adopted by a majority of the
whole Board, appoint such number of senior executives of the Company as Advisory
Directors as the Board may from time to time determine. The Advisory Directors
shall have such advisory responsibilities as the Chairman of the Board may
designate and the term of office of such Advisory Directors shall be as fixed by
the Board.

                                    OFFICERS
                                    --------

34.  Designation

     The officers of the Company shall be a Chairman of the Board, and a
President, one of whom shall be designated by the Board of Directors as the
Chief Executive Officer, one or more Vice Presidents, a Secretary, a Treasurer
and a Controller.  The Board of Directors may also elect one or more Vice
Chairmen of the Board, one or more Vice Chairmen of the Company, one or more
Executive Vice Presidents, Senior Vice Presidents, Group Vice Presidents, a
Chief Financial Officer, Deputy and Assistant Secretaries, Deputy and Assistant
Treasurers, Deputy and Assistant Controllers and such other officers as it shall
deem necessary.  Any number of offices may be held by the same person. The
Chairman of the Board of Directors shall be chosen from among the Directors.

35.  Election and Term

     At least annually, the Board of Directors of the Company shall elect the
officers of the Company and at any time thereafter the Board may elect
additional officers of the Company and each such officer shall hold office until
the officer's successor is elected and qualified or until the officer's earlier
death, resignation, termination of employment or removal.

                                       10
<PAGE>

36.  Removal

     Any officer shall be subject to removal or suspension at any time, for or
without cause, by the affirmative vote of a majority of the whole Board of
Directors.

37.  Resignations

     Any officer may resign at any time by giving written notice to the Chairman
of the Board, the President or to the Secretary. Such resignation shall take
effect upon receipt thereof or at any later time specified therein; and, unless
otherwise specified therein, the acceptance of such resignation shall not be
necessary to make it effective.

38.  Vacancies

     A vacancy in any office because of death, resignation, removal or any other
cause may be filled for the unexpired portion of the term by the Board of
Directors.

39.  Compensation

     The People Committee of the Board of Directors shall fix the salaries of
all employees of the Company who are subject to the reporting requirements of
Section 16(a) of the Securities Exchange Act of 1934 or any successor statute,
rule or provision, and other members of executive management designated by such
committee.

40.  Chairman of the Board

     The Chairman of the Board shall preside at all meetings of the stockholders
and of the Board of Directors, except as may be otherwise required under the law
of Delaware.  The Chairman shall act in an advisory capacity with respect to
matters of policy and other matters of importance pertaining to the affairs of
the Company.  The Chairman, alone or with the President, one or more of the Vice
Chairmen of the Board, and/or the Secretary shall sign and send out reports and
other messages which are to be sent to stockholders from time to time.  The
Chairman shall also perform such other duties as may be assigned to the Chairman
by these By-Laws, the Board of Directors or, if applicable, the Chief Executive
Officer.

41.  President

     The President, if a member of the Board of Directors, shall, in the absence
of the Chairman of the Board, preside at all meetings of the stockholders and of
the Board of Directors.  The President shall perform such other duties as may be
assigned to the President by these By-Laws, the Board of Directors or, if
applicable, the Chief Executive Officer.

42.  Chief Executive Officer

                                       11
<PAGE>

     The Chief Executive Officer shall have the general and active management
and supervision of the business of the Company. The Chief Executive Officer
shall see that all orders and resolutions of the Board of Directors are carried
into effect. The Chief Executive Officer shall also perform such other duties as
may be assigned to the Chief Executive Officer by these By-Laws or the Board of
Directors. The Chief Executive Officer shall designate who shall perform the
duties of the Chief Executive Officer in the Chief Executive Officer's absence.

43.  Vice Chairmen of the Board; Vice Chairmen

     The Vice Chairmen of the Board, if a member of the Board of Directors,
shall, in the absence of the Chairman of the Board and the President, and in
such order as may be designated by the Chairman of the Board, preside at all
meetings of the stockholders and of the Board of Directors. The Vice Chairmen of
the Board and the Vice Chairmen shall perform such other duties as may be
assigned to them by these By-Laws, the Board of Directors or the Chief Executive
Officer.

44.  Executive, Senior, Group and other Vice Presidents

     Each Executive Vice President, Senior Vice President, Group Vice President
and each other Vice President shall perform the duties and functions and
exercise the powers assigned to such officer by the Board of Directors or the
Chief Executive Officer.

45.  Chief Financial Officer

     The Chief Financial Officer (if any) shall act in an executive financial
capacity.  The Chief Financial Officer shall assist the Chairman of the Board
and the President in the general supervision of the Company's financial policies
and affairs.

46.  Secretary

     The Secretary shall attend all meetings of the Board of Directors and of
the stockholders and record all votes and the minutes of all proceedings in a
book to be kept for that purpose. The Secretary shall give, or cause to be
given, notice of all meetings of the stockholders and special meetings of the
Board of Directors and, when appropriate, shall cause the corporate seal to be
affixed to any instruments executed on behalf of the Company. The Secretary
shall also perform all duties incident to the office of Secretary and such other
duties as may be assigned to the Secretary by these By-Laws, the Board of
Directors, the Chairman of the Board or the Chief Executive Officer.

47.  Assistant Secretaries

     The Assistant Secretaries shall, during the absence of the Secretary,
perform the duties and functions and exercise the powers of the Secretary. Each
Assistant Secretary shall perform such other duties as may be assigned to such
Assistant Secretary by the Board of Directors, the Chairman of the Board, the
Chief Executive Officer or the Secretary.

                                       12
<PAGE>

48.  Treasurer

     The Treasurer shall have the custody of the funds and securities of the
Company and shall deposit them in the name and to the credit of the Company in
such depositories as may be designated by the Board of Directors or by any
officer or officers authorized by the Board of Directors to designate such
depositories; disburse funds of the Company when properly authorized by vouchers
prepared and approved by the Controller; and invest funds of the Company when
authorized by the Board of Directors or a committee thereof.  The Treasurer
shall render to the Board of Directors, the Chief Executive Officer, the Senior
Vice President-Finance or the Vice President-Finance, whenever requested, an
account of all transactions as Treasurer and shall also perform all duties
incident to the office of Treasurer and such other duties as may be assigned to
the Treasurer by these By-Laws, the Board of Directors, the Chief Executive
Officer, the Senior Vice President-Finance or the Vice President-Finance.

49.  Assistant Treasurers

     The Assistant Treasurers shall, during the absence of the Treasurer,
perform the duties and functions and exercise the powers of the Treasurer. Each
Assistant Treasurer shall perform such other duties as may be assigned to the
Assistant Treasurer by the Board of Directors, the Chief Executive Officer, the
Senior Vice President-Finance, the Vice President-Finance or the Treasurer.

50.  Controller

     The Controller shall serve as the principal accounting officer of the
Company and shall keep full and accurate account of receipts and disbursements
in books of the Company and render to the Board of Directors, the Chief
Executive Officer, the Senior Vice President-Finance or the Vice President-
Finance, whenever requested, an account of all transactions as Controller and of
the financial condition of the Company. The Controller shall also perform all
duties incident to the office of Controller and such other duties as may be
assigned to the Controller by these By-Laws, the Board of Directors, the Chief
Executive Officer, the Senior Vice President-Finance or the Vice President-
Finance.

51.  Assistant Controllers

     The Assistant Controllers shall, during the absence of the Controller,
perform the duties and functions and exercise the powers of the Controller. Each
Assistant Controller shall perform such other duties as may be assigned to such
officer by the Board of Directors, the Chief Executive Officer, the Senior Vice
President-Finance, the Vice President-Finance or the Controller.

                                       13
<PAGE>

                       COMPANY CHECKS, DRAFTS AND PROXIES
                       ----------------------------------

52.  Checks, Drafts

     All checks, drafts or other orders for the payment of money by the Company
shall be signed by such person or persons as from time to time may be designated
by the Board of Directors or by any officer or officers authorized by the Board
of Directors to designate such signers; and the Board of Directors or such
officer or officers may determine that the signature of any such authorized
signer may be facsimile.

53.  Proxies

     Except as otherwise provided by resolution of the Board of Directors, the
Chairman of the Board, the President, any Vice Chairman of the Board, any Vice
President, the Treasurer and any Assistant Treasurer, the Controller and any
Assistant Controller, the Secretary and any Assistant Secretary of the Company,
shall each have full power and authority, in behalf of the Company, to exercise
any and all rights of the Company with respect to any meeting of stockholders of
any corporation in which the Company holds stock, including the execution and
delivery of proxies therefor, and to consent in writing to action by such
corporation without a meeting.

                                 CAPITAL STOCK
                                 -------------

54.  Stock Certificates

     Each holder of stock in the Company shall be entitled to have a certificate
signed by, or in the name of the Company by, the Chairman of the Board, the
President, any Vice Chairman of the Board, any Executive Vice President, any
Senior Vice President, any Group Vice President or any other Vice President, and
by the Secretary or any Assistant Secretary of the Company, certifying the
number of shares owned by such holder in the Company.  Any of or all the
signatures on the certificate may be a facsimile.  In case any officer, transfer
agent or registrar who has signed or whose facsimile signature has been placed
upon a certificate shall have ceased to be such officer, transfer agent or
registrar before such certificate is issued, it may be issued by the Company
with the same effect as if such person were such officer, transfer agent or
registrar at the date of issue.

55.  Record Ownership

     The Company shall be entitled to treat the person in whose name any share,
right or option is registered as the owner thereof, for all purposes, and shall
not be bound to recognize any equitable or other claim to or interest in such
share, right or option on the part of any other person, whether or not the
Company shall have notice thereof, except as otherwise provided by the law of
Delaware.

56.  Record Dates

     In order that the Company may determine the stockholders entitled to notice
of or to vote at any meeting of stockholders or any adjournment thereof, or
entitled to receive payment of any dividend or other distribution or allotment
of any rights, or entitled to exercise any rights in respect of any change,
conversion or exchange of stock or for the purpose of any other lawful action,
the Board of Directors may fix a record date, which shall not precede the date
upon which the

                                       14
<PAGE>

resolution fixing the record date is adopted by the Board of Directors and which
shall not be more than sixty nor less than ten days before the date of such
meeting, nor more than sixty days prior to any other action.

57.  Transfer of Stock

     Transfers of shares of stock of the Company shall be made only on the books
of the Company by the registered holder thereof, or by the registered holder's
attorney thereunto authorized by power of attorney duly executed and filed with
the Secretary or a transfer agent of the Company, and on surrender of the
certificate or certificates for such shares properly endorsed and the payment of
all taxes thereon.

58.  Lost, Stolen or Destroyed Certificates

     The Board of Directors may authorize a new certificate or certificates to
be issued in place of any certificate or certificates theretofore issued by the
Company alleged to have been lost, stolen or destroyed, upon the making of an
affidavit of the fact by the person claiming the certificate of stock to be
lost, stolen or destroyed. When authorizing such issue of a new certificate or
certificates, the Board of Directors may, in its discretion and as a condition
precedent to the issuance thereof, require the owner of such lost, stolen or
destroyed certificate or certificates, or the owner's legal representative, to
give the Company a bond sufficient to indemnify it against any claim that may be
made against the Company on account of the alleged loss, theft or destruction of
such certificate or the issuance of such new certificate.

59.  Terms of Preferred Stock

     The provisions of these By-Laws, including those pertaining to voting
rights, election of Directors and calling of special meetings of stockholders,
are subject to the terms, preferences, rights and privileges of any then
outstanding class or series of Preferred Stock as set forth in the Certificate
of Incorporation and in any resolutions of the Board of Directors providing for
the issuance of such class or series of Preferred Stock; provided, however, that
the provisions of any such Preferred Stock shall not affect or limit the
authority of the Board of Directors to fix, from time to time, the number of
Directors which shall constitute the whole Board as provided in Section 16
above, subject to the right of the holders of any class or series of Preferred
Stock to elect additional Directors as and to the extent specifically provided
by the provisions of such Preferred Stock.

                                INDEMNIFICATION
                                ---------------

60.  Indemnification

     (a) The Company shall indemnify and hold harmless, to the fullest extent
permitted by applicable law as it presently exists or may hereafter be amended,
any person who was or is made or is threatened to be made a party or is
otherwise involved in any claim, action, suit, or proceeding, whether civil,
criminal, administrative or investigative (a "proceeding") by reason of the fact
that

                                      15
<PAGE>

the person, or a person for whom he or she is the legal representative, is or
was a Director, officer, employee or agent of the Company or is or was serving
at the request of the Company as a director, officer, employee, fiduciary or
agent of another corporation or of a partnership, joint venture, trust, non-
profit entity, or other enterprise, including service with respect to employee
benefit plans, against all expense, liability and loss (including attorneys'
fees, judgments, fines, ERISA excise taxes or penalties and amounts paid or to
be paid in settlement) reasonably incurred or suffered by such person. The right
to indemnification conferred in this By-Law shall be a contract right. Except as
provided in paragraph (c) of this By-Law with respect to proceedings seeking to
enforce rights to indemnification, the Company shall indemnify a person in
connection with a proceeding initiated by such person or a claim made by such
person against the Company only if such proceeding or claim was authorized by
the Board of Directors of the Company.

     (b) The Company shall pay the expenses incurred in defending any proceeding
in advance of its final disposition, provided, however, that if and to the
extent required by law the payment of expenses incurred by any person covered
hereunder in advance of the final disposition of the proceeding shall be made
only upon receipt of an undertaking by or on behalf of the affected person to
repay all amounts advanced if it should ultimately be determined that such
person is not entitled to be indemnified under this By-Law or otherwise.

     (c) If a claim for indemnification or payment of expenses under this By-Law
is not paid in full within thirty days, or such other period as might be
provided pursuant to contract, after a written claim therefor has been received
by the Company, the claimant may file suit to recover the unpaid amount of such
claim or may seek whatever other remedy might be provided pursuant to contract.
In any such action the Company shall have the burden of proving that the
claimant was not entitled to the requested indemnification or payment of
expenses under applicable law. If successful in whole or in part, claimant shall
be entitled to be paid the expense of prosecuting such claim. Neither the
failure of the Company (including its Directors, independent legal counsel or
stockholders) to have made a determination prior to the commencement of such
action that indemnification of the claimant is proper in the circumstances
because the claimant has met the applicable standard of conduct set forth in the
General Corporation Law of the State of Delaware, nor an actual determination by
the Company (including its Directors, independent legal counsel or stockholders)
that the claimant has not met such applicable standard of conduct, shall be a
defense to the action or create a presumption that the claimant has not met the
applicable standard of conduct.

     (d) Any determination regarding whether indemnification of any person is
proper in the circumstances because such person has met the applicable standard
of conduct set forth in the General Corporation Law of the State of Delaware
shall be made by independent legal counsel selected by such person with the
consent of the Company (which consent shall not unreasonably be withheld).

     (e) The rights conferred on any person by this By-Law shall not be
exclusive of any other rights which such person may have or hereafter acquire
under any statute, provision of the Certificate of Incorporation, these By-Laws,
agreement, vote of stockholders or disinterested Directors or otherwise.

                                      16
<PAGE>

     (f) Any repeal or modification of the foregoing provisions of this By-Law
60 shall not adversely affect any right or protection hereunder of any person
with respect to any act or omission occurring prior to or at the time of such
repeal or modification.

                                 MISCELLANEOUS
                                 -------------

61.  Corporate Seal

     The seal of the Company shall be circular in form, containing the words
"Monsanto Company" and the word "Delaware" on the circumference surrounding the
word "Seal". Said seal may be used by causing it or a facsimile thereof to be
impressed or affixed or in any other manner reproduced.

62.  Fiscal Year

     The fiscal year of the Company shall begin on the first day of January in
each year.

63.  Auditors

     The Board of Directors shall select certified public accountants to audit
the books of account and other appropriate corporate records of the Company
annually and at such other times as the Board shall determine by resolution.

64.  Waiver of Notice

     Whenever notice is required to be given pursuant to the law of Delaware,
the Certificate of Incorporation or these By-Laws, a written waiver thereof,
signed by the person entitled to notice, whether before or after the time stated
therein, shall be deemed equivalent to notice. Attendance of a person at a
meeting of stockholders or the Board of Directors or a committee thereof shall
constitute a waiver of notice of such meeting, except when the stockholder or
Director attends such meeting for the express purpose of objecting, at the
beginning of the meeting, to the transaction of any business because the meeting
is not lawfully called or convened. Neither the business to be transacted at,
nor the purpose of, any regular or special meeting of the stockholders or the
Board of Directors or committee thereof need be specified in any written waiver
of notice unless so required by the Certificate of Incorporation or by these By-
Laws.

                             AMENDMENT TO BY-LAWS
                             --------------------

65.  Amendments

     Notwithstanding any provision of law which might otherwise permit a lesser
vote or no vote, but in addition to any affirmative vote of the holders of any
series of Preferred Stock of the Corporation required by law, the Certificate of
Incorporation or any Preferred Stock designation, the affirmative vote of the
holders of at least 80 percent of the voting power of all of the then-
outstanding Voting Stock (as defined in the Certificate of Incorporation),
voting together as a single

                                      17
<PAGE>

class, shall be required for the stockholders to amend or repeal the By-Laws or
to adopt new By-Laws. The By-Laws may also be amended or repealed and new By-
Laws may be adopted by the affirmative vote of a majority of the whole Board of
Directors at any regular or special meeting of the Board of Directors.

                         ____________________________

                               EMERGENCY BY-LAWS
                               -----------------

     These Emergency By-Laws, notwithstanding any different provision in the
Certificate of Incorporation or By-Laws, shall be operative during any emergency
resulting from an attack on the United States or on a locality in which the
Company conducts its business or customarily holds meetings of the Board of
Directors or its stockholders, or during any nuclear or atomic disaster, or
during the existence of any catastrophe, or other similar emergency condition,
as a result of which a quorum of the Board of Directors or a committee thereof
cannot be readily convened for action. These Emergency By-Laws shall cease to be
operative upon termination of such emergency.

     During any such emergency:

     (a) A meeting of the Board of Directors or a committee thereof may be
called by any officer or Director. Notice of the time and place of the meeting
shall be given by the person calling the meeting to only such of the Directors
as it may be feasible to reach at the time and by such means as may be feasible
at the time. Such notice shall be given at such time in advance of the meeting
as circumstances permit in the judgment of the person calling the meeting.

     (b) The officers or other persons designated on a list approved by the
Board of Directors before the emergency, all in such order or priority and
subject to such conditions and for such period of time (not longer than
reasonably necessary after the termination of the emergency) as may be provided
in the resolution approving the list, shall, to the extent required to
constitute a quorum at any meeting of the Board of Directors during the
emergency, be deemed Directors for such meeting. If at the time of the emergency
the Board of Directors has not approved such a list of persons, then to the
extent required to constitute a quorum at any meeting of the Board of Directors
during the emergency, the officers of the Company who are present shall be
deemed, in order of rank and within the same rank in order of seniority,
Directors for such meeting. Two Directors (including persons deemed to be
Directors) in attendance at the meeting shall constitute a quorum.

     (c) The Board of Directors, either before or during any such emergency, may
provide, and from time to time modify, lines of succession in the event that
during such an emergency any or all officers or agents of the Company shall for
any reason be rendered incapable of discharging their duties.

     (d) The Board of Directors, either before or during any such emergency,
may, effective in the emergency, change the General Offices or designate several
alternative General Offices or regional offices, or authorize an officer, or
officers, so to do.

                                      18
<PAGE>

     No officer, Director or employee acting in accordance with these Emergency
By-Laws shall be liable except for willful misconduct.

     These Emergency By-Laws shall be subject to repeal or change by further
action of the Board of Directors or by action of the stockholders, but no such
repeal or change shall modify the provisions of the next preceding paragraph
with regard to action taken prior to the time of such repeal or change. Any
amendment of these Emergency By-Laws may make any further or different provision
that may be practical and necessary for the circumstances of the emergency.

                                      19

<PAGE>

                                                                    Exhibit 24.2
                                                                    ------------

                               POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

That each person whose signature appears below, as a Director or Officer of
Monsanto Company (the "Company"), a Delaware corporation with its general
offices in the County of St. Louis, Missouri, does hereby make, constitute and
appoint R. WILLIAM IDE III, BARBARA L. BLACKFORD, SONYA M. DAVIS or JANET L.
HORGAN, or any one of them acting alone, his or her true and lawful attorneys,
with full power of substitution and resubstitution, in his or her name, place
and stead, in any and all capacities, to execute and sign the following
registration statements: (i) any registration statement under the Securities Act
of 1933, as amended (the "Act"), covering the issuance of debt securities; (ii)
any registration statement on Form S-8 covering the registration of additional
securities of the Company to be issued under the Monsanto Shared Success Stock
Option Plan, the Monsanto Company ERISA Parity Savings and Investment Plan, the
Monsanto Savings and Investment Plan or the Monsanto Management Incentive Plan
of 1996, in each case as approved by the Board of Directors of the Company;
(iii) any registration statement of Form S-8 covering the registration of
securities of the Company to be issued under the DEKALB Genetics Corporation
Savings and Investment Plan, the Delta and Pine Land Company Savings Plan or any
new or existing stock-based incentive plans of the Company or any subsidiary;
(iv) any registration statement filed pursuant to Rule 462(b) under the Act; and
(v) any amendment or post-effective amendment to any registration statement
previously filed by the Company, and any and all Amendments to any of the
foregoing, and documents in connection therewith, all to be filed with the
Securities and Exchange Commission under the Act or the Securities Exchange Act
of 1934, as amended, giving and granting unto said attorneys full power and
authority to do and perform such actions as fully as they might have done or
could do if personally present and executing any of said documents.


Dated and effective as of the 22nd of July, 1999.


/s/ Richard U. De Schutter                 /s/ Hendrik A. Verfaillie
- -------------------------------------      -----------------------------------
    Richard U. De Schutter, Director           Hendrik A. Verfaillie, Director



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