DOW CHEMICAL CO /DE/
424B2, 1999-11-05
CHEMICALS & ALLIED PRODUCTS
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<PAGE>

                                                Filed Pursuant to Rule 424(b)(2)
                                                Registration Number 333-88617

PROSPECTUS SUPPLEMENT
(To Prospectus dated October 19, 1999)

                                $1,000,000,000

                           The Dow Chemical Company

                          7 3/8% DEBENTURES DUE 2029

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

                   Interest payable on May 1 and November 1

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

             Dow may not redeem the debentures prior to maturity.

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

                  PRICE 98.870% AND ACCRUED INTEREST, IF ANY

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

<TABLE>
<CAPTION>
                                                      Underwriting
                                           Price to   Discounts and Proceeds to
                                            Public     Commissions      Dow
                                           --------   ------------- -----------
<S>                                      <C>          <C>           <C>
Per debenture...........................   98.870%        .875%       97.995%
Total................................... $988,700,000  $8,750,000   $979,950,000
</TABLE>

The Securities and Exchange Commission and state securities regulators have
not approved or disapproved these securities or determined if this prospectus
supplement or the accompanying prospectus is truthful or complete. Any
representation to the contrary is a criminal offense.

Morgan Stanley & Co. Incorporated expects to deliver the debentures to
purchasers on November 9, 1999.

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

                          MORGAN STANLEY DEAN WITTER

November 4, 1999
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
                             Prospectus Supplement
<S>                                                                         <C>
About Dow.................................................................. S-3
Recent Developments........................................................ S-3
Ratio of Earnings to Fixed Charges......................................... S-3
Use of Proceeds............................................................ S-3
Description of Debentures.................................................. S-4
Underwriter ............................................................... S-6

                                   Prospectus

About this Prospectus......................................................   2
The Dow Chemical Company...................................................   2
Use of Proceeds............................................................   2
Description of Capital Stock...............................................   2
Description of Debt Securities.............................................   8
Description of Warrants to Purchase Common Stock or Preferred Stock........  19
Description of Debt Warrants...............................................  20
Plan of Distribution.......................................................  21
Legal Matters..............................................................  22
Experts....................................................................  22
Where You Can Find More Information........................................  22
</TABLE>

   You should rely only on the information contained in this prospectus
supplement and the accompanying prospectus. We have not authorized anyone to
provide you with information different from that contained in this prospectus
supplement and the accompanying prospectus. We are offering to sell Debentures
and making offers to buy Debentures only in jurisdictions where offers and
sales are permitted. The information contained in this prospectus supplement
and the accompanying prospectus is accurate only as of the date of this
prospectus, regardless of the time of delivery of this prospectus supplement
and the accompanying prospectus or any sale of the Debentures. In this
prospectus supplement and the accompanying prospectus, "the Company," "we,"
"us" and "our" refer to Dow.

   If we use a capitalized term in this prospectus supplement and do not define
the term in this document, it is defined in the accompanying prospectus.


                                      S-2
<PAGE>

                                   ABOUT DOW

   We are a global science and technology based company that develops and
manufactures a portfolio of chemicals, plastics and agricultural products and
services for customers in 168 countries around the world. With annual sales of
more than $18 billion, we conduct operations through 14 global businesses
employing 39,000 people. We have 121 manufacturing sites in 32 countries and
supply more than 3,500 products.

   We were incorporated in 1947 under Delaware law and are the successor to a
Michigan corporation, of the same name, organized in 1897. Our principal
executive offices are located at 2030 Dow Center, Midland, Michigan 48674,
telephone 517-636-1000.

                              RECENT DEVELOPMENTS

   On October 21, 1999, we announced higher sales and earnings compared with
the same quarter a year ago. We reported sales of $4.7 billion, earnings before
interest, income taxes and minority interests of $584 million and net income of
$320 million. Earnings per share of $1.44 were up three percent from third
quarter 1998. Excluding unusual items from third quarter 1998, earnings per
share were up eight percent.

   On August 3, 1999, we entered into a merger agreement with Union Carbide
Corporation and Transition Sub Inc., our wholly owned subsidiary, under which
Transition Sub will merge with and into Union Carbide, with Union Carbide
becoming our wholly owned subsidiary. We will convert each share of Union
Carbide common stock outstanding at the effective time of the merger into 0.537
shares of our common stock, subject to adjustment as provided in the merger
agreement. The merger is subject to customary closing conditions, including the
approval by Union Carbide's stockholders. A special meeting of Union Carbide's
stockholders has been scheduled for December 1, 1999 to vote on the merger. The
merger is intended to qualify for accounting and financial purposes as a
pooling-of-interests.

                       RATIO OF EARNINGS TO FIXED CHARGES

<TABLE>
<CAPTION>
                                            Six Months
                                               Ended
                                             June 30,     Year Ended December 31,
                                            ------------  ------------------------
                                            1999   1998   1998 1997 1996 1995 1994
                                            -----  -----  ---- ---- ---- ---- ----
<S>                                         <C>    <C>    <C>  <C>  <C>  <C>  <C>
Ratio of Earnings to Fixed Charges.........   4.7    5.0  4.0  5.8  6.2  7.0  3.9
</TABLE>

   For the purpose of these ratios, earnings consist of income before (i)
taxes, (ii) minority interests, (iii) extraordinary items, (iv) amortization of
capitalized interest and (v) fixed charges (adjusted to exclude capitalized
interest) and after adjustment for unremitted earnings of 20%-50% owned
companies. Fixed charges consist of interest on all indebtedness, amortization
and debt expense, discount or premium and a portion of rentals deemed to
represent an interest factor.

                                USE OF PROCEEDS

   We will use the net proceeds from the sale of the Debentures for general
corporate purposes.

                                      S-3
<PAGE>

                           DESCRIPTION OF DEBENTURES

   The following description of the particular terms of the 7 3/8% Debentures
due November 1, 2029 offered by this prospectus supplement referred to in the
prospectus as the "debt securities," supplements the description of the general
terms and provisions of the debt securities included in the prospectus. The
following summary of the Debentures is qualified in its entirety by reference
in the prospectus to the description of the indenture, dated as of April 1,
1992, as supplemented by a supplemental indenture, dated as of January 1, 1994,
and a second supplemental indenture dated as of October 1, 1999, between us and
Bank One Trust Company, NA as successor in interest to The First National Bank
of Chicago, as trustee.

General

   The Debentures will mature on November 1, 2029. The Debentures will be
unsecured obligations and will rank equally with all our other unsecured and
unsubordinated indebtedness. The Debentures will be issued in fully registered
form only, in denominations of $1,000 and multiples of that amount. Principal
of and interest on the Debentures will be payable, and the transfer of
Debentures will be registerable, through the Depositary Trust Company, New
York, New York as described below.

   Each Debenture will bear interest from November 1, 1999 at the annual rate
of 7 3/8%. Interest on the Debentures will be payable semiannually on May 1 and
November 1, commencing May 1, 2000, to the person in whose name such Debenture
is registered at the close of business on the preceding April 15 or October 15.
Interest payable at the maturity of the Debentures will be payable to the
registered holder of the Debenture to whom principal is payable. Interest will
be computed on the basis of a 360-day year of twelve 30-day months.

   If any interest payment date falls on a day that is not a Business Day, the
interest payment will be postponed to the next day that is a Business Day, and
no interest on such payment will accrue for the period from and after such
interest payment date. If the maturity date of the Debentures falls on a day
that is not a Business Day, the payment of interest and principal may be made
on the next succeeding Business Day, and no interest on such payment will
accrue for the period from and after the maturity date.

   Interest payments for the Debentures will include accrued interest from and
including the date of issue or from and including the last date in respect of
which interest has been paid, as the case may be, to, but excluding, the
interest payment date or the date of maturity, as the case may be.

   We may, without the consent of the holders of Debentures, issue additional
debentures having the same ranking and the same interest rate, maturity and
other terms as the Debentures. Any additional debentures having such similar
terms, together with the Debentures, will constitute a single series of
debentures under the indenture. No additional debentures may be issued if an
Event of Default has occurred with respect to the Debentures.

   As used in this prospectus supplement, "Business Day" means any day, other
than a Saturday or Sunday, that is neither a legal holiday nor a day on which
banking institutions are authorized or required by law or regulation to close
in The City of New York.

   We may not redeem the Debentures prior to maturity.

Book-entry, Delivery and Form

   The Debentures will be issued in the form of one or more fully registered
debentures which will be deposited with, or on behalf of, the Depository and
registered in the name of the Cede & Co., the Depositary's nominee. Beneficial
interests in the Debentures will be represented through book-entry accounts of
financial institutions acting on behalf of beneficial owners as direct and
indirect participants in the Depositary. Except as set forth below, the
Debentures may be transferred, in whole and not in part, only to another
nominee of the Depositary or to a Successor of the Depositary or its nominee.

                                      S-4
<PAGE>

   The Depositary has advised us that the Depositary is a limited-purpose trust
company organized under the New York Banking Law, 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 Securities Exchange Act of 1934, as amended. The
Depositary holds securities deposited with it by its participants and
facilitates the settlement of transactions among its participants in those
securities through electronic computerized book-entry changes in accounts of
the participants, thereby eliminating the need for physical movement of
securities certificates. The Depositary's participants include securities
brokers and dealers, including the Underwriter, banks, trust companies,
clearing corporations and certain other organizations, some of whom, and/or
their representatives, own the Depositary. Access to the Depositary book-entry
system is also available to others, such as banks, brokers, dealers and trust
companies that clear through or maintain a custodial relationship with a
participant, either directly or indirectly.

   The Depositary's 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." The Depositary has informed participants and other
members of the financial community that it has developed and is implementing a
program so that these systems, as the same relate to the timely payment of
distributions, including principal and income payment 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, the Depositary's plan includes a
testing phase, which is expected to be completed within appropriate time
frames. However, the Depositary's ability to perform its services properly is
also dependent upon other parties, including but not limited to issuers and
their agents, as well as third party vendors from whom the Depositary licenses
software and hardware, and third party vendors on whom the Depositary relies
for information or the provision of services, including telecommunication and
electrical utility service providers, among others. The Depositary has informed
the financial community that it is contacting, and will continue to contact,
third party vendors from whom the Depositary acquires services to impress upon
them the importance of such services being Year 2000 compliant, and to
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 the Depositary, the foregoing information with respect to the
Depositary has been provided to the financial community for informational
purposes only and is not intended to serve as a representation, warranty or
contract modification of any kind. We make no representation as to the accuracy
or completeness of such information.

   Individual certificates in respect of the Debentures will not be issued in
exchange for the Debentures, except in very limited circumstances. If DTC
notifies us that it is unwilling or unable to continue as a clearing system in
connection with the Debentures or ceases to be a clearing agency registered
under the Exchange Act, and a successor clearing system is not appointed by us
within 90 days after receiving that notice from DTC or upon becoming aware that
DTC is no longer so registered, we will issue or cause to be issued individual
certificates in registered form on registration of transfer of, or in exchange
for, book-entry interests in the Debentures represented by such Debentures upon
delivery of such Debentures for cancellation.

   Title to book-entry interests in the Debentures will pass by book-entry
registration of the transfer within the records of DTC, in accordance with its
procedures. Book-entry interests in the Debentures may be transferred within
DTC in accordance with procedures established for this purpose by DTC.

   A further description of the Depositary's procedures with respect to the
Debentures is set forth in the prospectus under "Description of Debt
Securities--Global Securities". The Depositary has confirmed to us, the
Underwriter and the Trustee that it intends to follow those procedures.

   Initial settlement for the Debentures will be made in immediately available
funds. Secondary market trading between DTC participants will occur in the
ordinary way in accordance with the Depositary's rules and will be settled in
immediately available funds using the Depositary's Same-Day Funds Settlement
System.

                                      S-5
<PAGE>

                                  UNDERWRITER

   Under the terms and subject to the conditions contained in an Underwriting
Agreement dated the date of this prospectus supplement, Morgan Stanley & Co.
Incorporated, as underwriter, has agreed to purchase, and we have agreed to
sell to the underwriter, $1,000,000,000 principal amount of Debentures.

   The Underwriting Agreement provides that the obligation of the underwriter
to pay for and accept delivery of the Debentures is subject to the approval of
certain legal matters by its counsel and to certain other conditions. The
underwriter is obligated to take and pay for all the Debentures if any are
taken.

   The underwriter proposes to offer part of the Debentures directly to the
public at the public offering price set forth on the cover page of this
prospectus supplement and part to certain dealers at a price that represents a
concession not in excess of .50% of the principal amount of the Debentures. The
underwriter may allow, and such dealers may reallow, a concession not in excess
of .25% of the principal amount of the Debentures to certain other dealers.
After the initial offering of the Debentures, the offering price and other
selling items may from time to time be varied by the underwriter.

   We have agreed to indemnify the underwriter against certain liabilities,
including liabilities under the Securities Act of 1933, as amended. The
underwriter has agreed to reimburse us for certain fees and expenses in
connection with the offering of the Debentures in the amount of $5,000,000.

   We do not intend to apply for listing of the Debentures on a national
securities exchange, but we have been advised by the underwriter that it
presently intends to make a market in the Debentures as permitted by applicable
laws and regulations. The underwriter is not obligated however, to make a
market in the Debentures and any such market making may be discontinued at any
time at the sole discretion of the underwriter. Accordingly, no assurance can
be given as to the liquidity of, or trading markets for, the Debentures.

   In order to facilitate the offering of the Debentures the underwriter may
engage in transactions that stabilize, maintain or otherwise affect the price
of the Debentures. Specifically, the underwriter may over-allot in connection
with the offering, creating a short portion in the Debentures for its own
account. In addition, to cover over-allotments or to stabilize the price of the
Debentures, the underwriter may bid for, and purchase, the Debentures in the
open market. Finally, the underwriter may reclaim selling concessions allowed
to a dealer for distributing the Debentures in the offering, if the underwriter
repurchases previously distributed Debentures in transactions to cover
underwriter short positions, in stabilization transactions or otherwise. Any of
these activities may stabilize or maintain the market price of the Debentures
above independent market levels. The underwriter is not required to engage in
these activities and may end any of these activities at any time.

   From time to time, the underwriter has acted as our financial advisor and
has received customary compensation for such services.

                                      S-6
<PAGE>

                                   PROSPECTUS

                            The Dow Chemical Company

   By this prospectus, Dow may offer from time to time a total of up to
$2,500,000,000 of securities, which may include up to:

                    $1,650,000,000 of common stock

                    $1,650,000,000 of preferred stock

                    $1,650,000,000 of warrants to purchase common stock

                    $1,650,000,000 of warrants to purchase preferred stock

                    $2,500,000,000 of debt securities

                    $2,500,000,000 of warrants to purchase debt securities

   Dow will provide you with the specific terms and the public offering prices
of these securities in supplements to this prospectus. You should read this
prospectus and the prospectus supplements carefully before you invest. This
prospectus may not be used to offer and sell securities unless accompanied by a
prospectus supplement.

   Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus is truthful and complete. Any representation to the contrary is
a criminal offense.

                   This prospectus is dated October 19, 1999
<PAGE>

                             ABOUT THIS PROSPECTUS

   This prospectus is part of a registration statement that Dow filed with the
Securities and Exchange Commission under the shelf registration process. Dow
may sell common stock, preferred stock, warrants to purchase common stock and
warrants to purchase preferred stock for up to $1,650,000,000 and debt
securities and warrants to purchase debt securities for up to $2,500,000,000
under this prospectus. The total sales of all securities sold under this
prospectus, however, may not exceed $2,500,000,000. This prospectus provides
you with a general description of the securities Dow may offer. Each time Dow
sells securities, Dow will provide a prospectus supplement that will contain
specific information about the terms of that offering. The prospectus
supplement may also add, update or change information contained in this
prospectus. You should read both this prospectus and any prospectus supplement
together with additional information described under the heading "Where You Can
Find More Information."

                            THE DOW CHEMICAL COMPANY

   Dow manufactures and sells chemicals, plastic materials, agricultural and
other specialized products and services. Dow is a global science and
technology-based company that develops and manufactures a portfolio of
chemicals, plastics and agricultural products and services for customers in 168
countries around the world. Dow conducts its operations through subsidiaries
and 14 global businesses, including 123 manufacturing sites in 32 countries,
and supplies more than 3,500 products through the efforts of 39,000 employees.
Dow's corporate offices are located at 2030 Dow Center, Midland, Michigan
48674, and Dow's telephone number is (517) 636-1000.

   Additional information concerning Dow and its subsidiaries is included in
the documents filed with the Securities and Exchange Commission and
incorporated in this prospectus by reference. See the discussion under the
heading "Where You Can Find More Information."

                                USE OF PROCEEDS

   Dow will use the net proceeds from the sale of the securities for general
corporate purposes.

                          DESCRIPTION OF CAPITAL STOCK

   The following summary of common stock and preferred stock of Dow does not
purport to be complete and is subject to, and qualified in its entirety by
reference to, the relevant provisions of Delaware law, and by Dow's certificate
of incorporation and bylaws, which are incorporated by reference as exhibits to
the registration statement of which this prospectus is a part.

   Dow is authorized to issue 750,000,000 shares of all classes of stock,
500,000,000 of which are shares of common stock, par value $2.50 per share, and
250,000,000 of which are shares of preferred stock. As of September 30, 1999,
there were 219,297,129 shares of common stock issued and outstanding and
1,324,306 shares of series A ESOP convertible preferred stock issued and
outstanding. All issued and outstanding shares of common stock and series A
ESOP convertible preferred stock are fully paid and nonassessable. Any
additional shares of common stock and preferred stock that Dow issues will be
fully paid and nonassessable. Neither Dow's common stockholders nor preferred
stockholders have preemptive rights.

Common Stock

 General

   Dow's certificate of incorporation provides that, subject to all of the
rights of holders of preferred stock provided for by the board of directors or
by Delaware corporate law, the holders of common stock will have full voting
rights on all matters requiring stockholder action, with each share of common
stock being entitled to one vote and having equal rights of participation in
the dividends and assets of Dow.

                                       2
<PAGE>

 Board of Directors

   Dow's certificate of incorporation divides Dow's board of directors into
three classes of directors that are as nearly equal in number as possible with
three-year terms. As a result, approximately one-third of Dow's board of
directors is elected each year. A quorum of directors consists of a majority of
Dow's entire board of directors then holding office.

 Number, Filling of Vacancies and Removal of Directors

   Dow's certificate of incorporation and bylaws provide that its board of
directors may not have less than six or more than twenty-one members. The
actual number of directors is determined by a vote of a majority of Dow's
entire board of directors. Currently, Dow has fifteen members on its board of
directors. Vacancies on Dow's board of directors and any newly created
directorships are filled by a vote of the majority of the other directors then
in office. Directors elected to fill a vacancy or a new position hold office
until the next annual meeting of stockholders. Directors can be removed only
for cause and only by the vote of stockholders holding 80% of the voting power
of Dow's outstanding stock entitled to vote generally in the election of
directors, voting together as a single class.

 Dividends

   Delaware corporate law generally provides that a corporation, subject to
restrictions in its certificate of incorporation, including preferred
stockholders' rights to receive dividends prior to common stockholders, may
declare and pay dividends out of:

  . surplus; or

  . net profits for the fiscal year in which the dividend is declared and/or
    the preceding fiscal year, if there is no surplus.

Dividends may not be paid out of net profits so long as the capital of the
corporation is less than the aggregate amount of capital represented by the
issued and outstanding stock of all classes having a preference on the
distribution of assets. Dividends on Dow common stock are not cumulative. Dow's
certificate of incorporation does not contain any additional restrictions on
the declaration or payment of dividends.

 Special Meetings of Stockholders

   Dow's bylaws provide that a special stockholders' meeting for any purpose
may be called only by the board of directors by a resolution adopted by a
majority of the entire board:

  . upon motion of a director; or

  . upon written request of stockholders holding at least 50% of the voting
    power of the shares of capital stock outstanding and entitled to vote
    generally in the election of directors.

   Stockholder notices requesting a special meeting must be given to Dow's
secretary. The notice must include, as to each matter the stockholder proposes
to bring before the meeting:

  . the name and address of the stockholder;

  . the class or series and number of shares of capital stock that are
    beneficially owned by the stockholder;

  . a brief description of the business to be brought before the meeting,
    including the text of any proposed amendment to the certificate of
    incorporation or bylaws;

  . a description of all arrangements or understandings between the
    stockholder and any other persons related to the business proposal;

  . any material business interests of the stockholder in the business
    proposal; and

  . a representation that the stockholder intends to appear in person or by
    proxy at the meeting to bring the business before the meeting.

                                       3
<PAGE>

 Advance Notice Provisions for Stockholder Proposals Other than Election of
 Directors

   Dow's bylaws provide that a stockholder may bring business before an annual
stockholders' meeting if the stockholder is a stockholder on the record date of
giving notice and on the record date of the meeting and gives notice to Dow's
secretary of business that is proper to be brought at the meeting under
Delaware corporate law:

  . no earlier than 120 days or later than 60 days before the anniversary
    date of the first mailing of proxy materials for the last annual meeting;
    or

  . if the annual meeting is more than 30 days before or after the
    anniversary date of the last annual meeting, Dow must receive the
    stockholder's notice no later than the close of business on the 10th day
    after the earlier of the date on which notice of the annual meeting date
    was mailed or publicly disclosed.

   The notice must include the same information required to be included in a
stockholder's notice in connection with requesting a special meeting. See the
section of this prospectus captioned "Special Meetings of Stockholders."

 Advance Notice Provisions for Stockholder Nominations of Directors at an
 Annual Meeting

   Dow's bylaws provide that a stockholder may nominate a person for election
to the board of directors at an annual stockholders' meeting if the stockholder
gives notice to Dow's secretary:

  . no more than 120 days and no less than 60 days before the anniversary
    date of the first mailing of proxy materials for the last annual meeting;
    or

  . if the annual meeting is more than 30 days before or after the
    anniversary date of the last annual meeting, Dow must receive the
    stockholder's notice no later than the close of business on the 10th day
    after the earlier of the day on which notice of the annual meeting date
    was mailed or publicly disclosed.

   The notice must include the following:

  . a description of all arrangements or understandings between the
    stockholder and the nominee and any other person pursuant to which the
    nomination is made;

  . the information regarding the nominee that would have been required to be
    included in a proxy statement filed under the proxy rules of the
    Securities and Exchange Commission if the nominee had been nominated by
    the board of directors;

  . the consent of the nominee to serve as a director if he or she is
    elected; and

  . the information required to be included in a stockholder's notice in
    connection with requesting a special meeting. See the section of this
    prospectus captioned "Special Meetings of Stockholders."

 Advance Notice Provisions for Stockholder Nominations of Directors at a
 Special Meeting

   Dow's bylaws provide that a stockholder may nominate a person for election
to the board of directors at a special meeting of stockholders if the
stockholder gives Dow's secretary notice of the nomination no later than the
close of business on the seventh day after notice of the special meeting is
first given to stockholders.

   In addition to the information required to be included in a stockholder's
notice in connection with a special meeting, the notice must include the same
information that would be required to nominate a person for election as a
director at an annual meeting. See the section of this prospectus captioned
"Advance Notice Provisions for Stockholder Nominations of Directors at an
Annual Meeting."

 Stockholder Action by Written Consent

   Under Delaware corporate law, unless otherwise provided in a corporation's
certificate of incorporation, any action required or permitted to be taken at
an annual or special stockholders' meeting may be taken by

                                       4
<PAGE>

written consent, without a meeting, prior notice or a vote. The written consent
must be signed by holders of outstanding stock having the minimum number of
votes necessary to authorize or take such action at a meeting at which all
shares entitled to vote on the matter were present and voted. Dow's certificate
of incorporation, however, provides that any action required or permitted to be
taken by the stockholders must be taken at a duly called annual or special
stockholders' meeting and may not be taken by written consent.

 Transactions with Interested Stockholders and a Merger or Sale of Assets

   Delaware corporate law requires the approval of the board of directors and a
majority of a corporation's outstanding stock entitled to vote to authorize a
merger or consolidation unless the company's certificate of incorporation
requires a greater percentage. Unless required by a corporation's certificate
of incorporation, stockholder approval, however, is not required in certain
cases, such as where:

  . either no shares of common stock of the surviving corporation and no
    shares, securities or obligations convertible into common stock are to be
    issued or delivered in the merger; or

  . the authorized and unissued shares or the treasury shares of common stock
    of the surviving corporation to be issued or delivered in the merger,
    plus those initially issuable upon conversion of any other shares,
    securities or obligations to be issued or delivered in the merger;

do not exceed 20% of the shares of common stock of the corporation outstanding
immediately prior to the effective date of the merger. A sale of all or
substantially all of a Delaware corporation's assets or a voluntary dissolution
of a Delaware corporation requires the vote of a majority of the board of
directors and a majority of the corporation's outstanding shares entitled to
vote on the matter unless the company's certificate of incorporation requires a
greater percentage. Dow's certificate of incorporation does not require a
greater percentage, except as described below.

   Delaware corporate law generally defines an interested stockholder as a
person, other than the corporation and any direct or indirect majority owned
subsidiary of the corporation:

  . who is the direct or indirect owner of 15% or more of the outstanding
    voting stock of the corporation; or

  . is an affiliate or associate of the corporation and was the direct or
    indirect owner of 15% or more of the outstanding voting stock of the
    corporation at any time within the three-year period immediately prior to
    the date it asked for determination of its status as an interested
    stockholder; and

  . the affiliates and associates of that person.

   Delaware corporate law prohibits an interested stockholder from engaging in
a business combination with the Delaware corporation for three years following
the time of becoming an interested stockholder. This three-year waiting period
does not apply when:

  . prior to the time of becoming an interested stockholder, the board of
    directors approves either the business combination or the transaction
    that resulted in the stockholder becoming an interested stockholder;

  . as a result of becoming an interested stockholder, the stockholder owned,
    excluding shares owned by directors who are also officers and certain
    employee stock plans, at least 85% of the outstanding voting stock of the
    corporation at the time the transaction began; or

  . at or after the time of becoming an interested stockholder, the business
    combination is approved by the board of directors and authorized at a
    meeting of stockholders by a vote of at least two-thirds of the
    outstanding voting stock that is not owned by the interested stockholder.

   These restrictions also do not apply in certain other circumstances,
including business combinations with an interested stockholder that are
proposed after a public announcement of and prior to the consummation or
abandonment of:

  . certain mergers or consolidations;

                                       5
<PAGE>

  . sales of 50% or more of the aggregate market value of a corporation's
    assets or outstanding voting stock; or

  . tender offers or exchange offers for 50% or more of a corporation's
    voting stock.

   Delaware corporate law allows a corporation to specify in its certificate of
incorporation or bylaws that it will not be governed by the section relating to
transactions with interested stockholders. Dow has not made that election in
its certificate of incorporation or bylaws.

   Dow's certificate of incorporation provides that, in addition to the vote
required pursuant to Delaware corporate law, the vote of stockholders owning at
least 80% of the voting power of the shares of capital stock entitled to vote
generally in the election of directors, voting together as a single class, is
required to approve any of the following business combination transactions:

  . a merger or consolidation of Dow or a subsidiary of which Dow ultimately
    owns 50% or more of the capital stock with:

   -- an interested stockholder; or

   -- any other individual or entity that, after the merger or
      consolidation, would be an affiliate or associate of an interested
      stockholder;

  . a sale, lease, exchange, mortgage, pledge, transfer or other disposition,
    in one or more transactions with or on behalf of an interested
    stockholder or an affiliate or associate of an interested stockholder, of
    any assets of Dow or any subsidiary of Dow that constitutes 5% or more of
    Dow's total consolidated assets as of the end of the most recent quarter;

  . the issuance or transfer by Dow or any of its subsidiaries of any
    securities of Dow or its subsidiaries in one or more transactions to, or
    proposed by or on behalf of, an interested stockholder or an affiliate or
    associate of an interested stockholder in exchange for cash, securities
    or other property constituting not less than 5% of Dow's consolidated
    total assets as of the end of the most recent quarter;

  . the adoption of a plan or proposal for liquidation or dissolution of Dow
    or any spin-off or split-up of any kind of Dow or any subsidiary of Dow
    that is proposed by or on behalf of an interested stockholder or an
    affiliate or associate of an interested stockholder; or

  . any reclassification of securities or recapitalization of Dow, or any
    merger or consolidation of Dow with a subsidiary of Dow or other
    transaction that has the direct or indirect effect of increasing the
    percentage of the outstanding shares of:

   -- any class of equity securities of Dow or any subsidiary of Dow; or

   -- any class of securities of Dow or any subsidiary that are convertible
      into equity securities of Dow or any subsidiary that are owned
      directly or indirectly by an interested stockholder and all of its
      affiliates and associates.

   However, the vote of only a majority of the stockholders entitled to vote
generally in the election of directors, voting together as a single class, is
required to approve a business combination transaction that:

  . has been approved by a majority of continuing directors, even if they
    constitute less than a quorum; or

  . meets certain price and consideration conditions and procedures.

   A "continuing director" is:

   --  any member of the board of directors who is not an interested
      stockholder involved in a business combination described above or an
      affiliate, associate, employee, agent or nominee of an interested
      stockholder or relative of any of the foregoing persons, and was a
      member of the board before the interested stockholder became an
      interested stockholder; or

   -- a successor of a director described above who is recommended or
      elected to succeed a director described above by the vote of a
      majority of such directors then on the board.

                                       6
<PAGE>

   Dow's certificate of incorporation defines an interested stockholder as any
person or entity other than Dow, any subsidiary of Dow or any employee benefit
plan of Dow or a subsidiary of Dow, that:

  . is, or was at any time within the two-year period prior to the date in
    question, the direct or indirect beneficial owner of 10% or more of the
    voting power of the then-outstanding voting stock of Dow;

  . is an affiliate of Dow and, at any time within the two-year period
    immediately prior to the date in question, was the direct or indirect
    beneficial owner of 10% or more of the voting power of the outstanding
    voting stock of Dow; or

  . is an assignee of, or has otherwise succeeded to, any shares of voting
    stock of Dow of which an interested stockholder was the direct or
    indirect beneficial owner, at any time within the two-year period
    immediately prior to the date in question, if such assignment or
    succession occurred in the course of a transaction or series of
    transactions not involving a public offering under the Securities Act of
    1933.

   For purposes of determining whether a person is an interested stockholder,
the outstanding voting stock of Dow includes unissued shares of voting stock of
Dow beneficially owned by the interested stockholder but not other shares of
voting stock of Dow that may be issuable pursuant to an agreement, arrangement
or understanding or upon the exercise of conversion rights, warrants or
options, or otherwise, to any person who is not an interested stockholder.

Preferred Stock

 General

   Dow's board of directors is authorized, subject to Delaware corporate law
and without a vote of its stockholders, to issue shares of preferred stock from
time to time in one or more series and to determine the voting rights,
designations, preferences and relative, participating, optional or other
special rights and qualifications, limitations and restrictions of any series
of preferred stock. The prospectus supplement relating to an offering of shares
of Dow's preferred stock will describe the terms of the series of preferred
stock Dow is offering.

 Series A ESOP Convertible Preferred Stock

   Dividend Rights. Dow's series A preferred stockholders are entitled to
receive annual dividends, payable semi-annually, of $6.67 per share. Dow's
series A preferred stock ranks senior to Dow's common stock as to the payment
of dividends.

   Rights Upon Liquidation, Dissolution and Winding Up. If Dow is liquidated,
dissolved or wound up, series A preferred stockholders are entitled to receive,
out of Dow's remaining assets and subject to the rights of holders of stock
ranking senior to or equal with the series A preferred stock, $86.125 per share
plus all accumulated and unpaid dividends. Dow's series A preferred stock ranks
senior to Dow's common stock as to the distribution of assets upon liquidation,
dissolution and winding up of Dow.

   Conversion Rights. Shares of Series A preferred stock are generally
convertible into shares of Dow common stock at a conversion rate of one share
of Dow common stock for one share of series A preferred stock. Shares of Series
A preferred stock are convertible into shares of Dow common stock at a
conversion rate equal to the ratio of $86.125 to the fair market value of a
share of Dow common stock, however, in the event that:

  . it is necessary or appropriate to redeem series A preferred stock to
    satisfy any investment election available to participants under Dow's
    employee stock ownership plan or for distributions to be made under Dow's
    employee stock ownership plan; and

  . the fair market value of a share of Dow common stock is less than
    $86.125.

   The conversion rate of shares of Dow common stock to shares of series A
preferred stock is subject to certain anti-dilution adjustments in some
circumstances.


                                       7
<PAGE>

   If Dow consolidates or merges with another entity and Dow's common stock is
exchanged, converted or changed by operation of law into:

  . only "qualified employer securities," as defined in the Internal Revenue
    Code and Employee Retirement Income Security Act of 1974, of a successor
    corporation, series A preferred stock will be assumed by and become
    preferred stock of the successor corporation and be convertible into
    qualified employer securities; or

  . securities other than only qualified employer securities, series A
    preferred stockholders will receive $90.43 per share plus accrued and
    unpaid dividends.

Dow will be unable to complete a consolidation or merger if the series A
preferred shares outstanding are not assumed and authorized by the surviving
corporation.

   Redemption Rights. All or part of the series A preferred stock is redeemable
by Dow at any time:

  . after January 1, 2000, at $86.125 per share plus accrued and unpaid
    dividends to the redemption date;

  . at $86.125 per share plus accrued and unpaid dividends to the redemption
    date if:

   -- there is a change in U.S. federal tax law that has the effect of
      preventing Dow from claiming tax deductions on series A preferred
      stock dividends;

   -- the Internal Revenue Service determines that Dow's employee stock
      ownership plan does not comply with its rules or regulations;

   -- Dow terminates the employee stock ownership plan or future
      contributions to its employee stock ownership plan because a change in
      law materially affects the employee stock ownership plan; or

   -- the redemption of series A preferred stock is necessary or appropriate
      to satisfy any investment election provided to employee stock
      ownership plan participants or to provide for distributions to be made
      under the employee stock ownership plan; and

  . at $90.43 per share plus accrued and unpaid dividends to the redemption
    date if Dow terminates the employee stock ownership plan for a reason
    other than a change in law that materially affects the employee stock
    ownership plan.

   Dow will redeem shares of series A preferred stock for $86.125 plus accrued
and unpaid dividends when and to the extent necessary to pay principal,
interest or premium due on any indebtedness incurred by the trustee for the
benefit of the employee stock option plan.

   Voting Rights. Dow's series A preferred stock holders are entitled to vote
on all matters submitted to a vote of Dow's common stockholders and to vote
together with Dow's common stockholders as one class. Each share of Dow series
A preferred stock is entitled to the number of votes equal to the number of
shares of Dow common stock into which a share of series A preferred stock could
be converted on the record date, rounded to the nearest one-tenth of a vote.
The voting rights of Dow series A preferred stock are subject to certain anti-
dilution adjustments in some circumstances.

                         DESCRIPTION OF DEBT SECURITIES

   The following description of the debt securities summarizes the material
terms and provisions of the debt securities to which a prospectus supplement
may relate. Each time Dow offers debt securities, the prospectus supplement
related to that offering will describe the terms of the debt securities Dow is
offering.

   The debt securities will be issued under an indenture, dated as of April 1,
1992, as supplemented by a supplemental indenture, dated as of January 1, 1994,
and a second supplemental indenture dated as of October 1, 1999, between Dow
and Bank One Trust Company, NA (successor in interest to The First National
Bank of Chicago), as trustee. The indenture as supplemented by the supplemental
indentures is referred to in this section

                                       8
<PAGE>

as the "indenture." The following summary of the debt securities and the
indenture does not purport to be complete and is subject to the provisions of
the indenture, including the defined terms. Whenever Dow refers to particular
sections, articles or defined terms of the indenture, those sections, articles
or defined terms are incorporated by reference in this prospectus and
prospectus supplement. You should review the indenture that is filed as
exhibits to the registration statement for additional information.

General

   Dow may issue debt securities from time to time in one or more series
without limitation as to aggregate principal amount. The indenture does not
limit the amount of other indebtedness or securities which Dow may issue.

   The debt securities will be unsecured obligations and will rank equally with
all of Dow's other unsecured and unsubordinated indebtedness.

   The prospectus supplement will describe the following terms of the debt
securities Dow is offering:

  . the title of the debt securities or the series in which the debt
    securities will be included;

  . any limit on the aggregate principal amount of the debt securities of
    that series;

  . whether the debt securities may be issued as registered securities or
    bearer securities or both, whether any of the debt securities may be
    issued initially in temporary global form and whether any of the debt
    securities may be issued in permanent global form;

  . the price or prices at which the debt securities will be issued;

  . the date or dates on which the principal amount of the debt securities is
    payable;

  . the interest rate or rates, or the formula by which the interest rate or
    rates will be determined, if any, and the dates from which any interest
    will accrue;

  . the interest payment dates on which any interest will be payable, the
    regular record date for any interest payable on any debt securities that
    are registered securities on any interest payment date, and the extent to
    which, or the manner in which, any interest payable on a global security
    on an interest payment date will be paid if different from the manner
    described below under the section of this prospectus captioned "Global
    Securities";

  . any mandatory or optional sinking fund or analogous provisions;

  . each office or agency where the principal of and any premium and interest
    on the debt securities will be payable and each office or agency where
    the debt securities may be presented for registration of transfer or
    exchange;

  . the date, if any, after which and the price or prices at which the debt
    securities may, pursuant to any optional or mandatory redemption
    provisions, be redeemed, in whole or in part, and the other detailed
    terms and provisions of any optional or mandatory redemption provisions;

  . the denominations in which Dow may issue any debt securities which are
    registered securities, if other than denominations of $1,000 and any
    integral multiple thereof, and the denominations in which Dow may issue
    any debt securities which are bearer securities, if other than
    denominations of $5,000;

  . the currency or currencies of payment of principal of and any premium and
    interest on the debt securities;

  . any index used to determine the amount of payments of principal of and
    any premium and interest on the debt securities;

  . any additional covenants applicable to the debt securities; and

  . any other terms and provisions of the debt securities not inconsistent
    with the terms and provisions of the indenture.

                                       9
<PAGE>

   The prospectus supplement also will describe any special provisions for the
payment of additional amounts with respect to the debt securities.

   If the purchase price of any of the debt securities is denominated in one or
more foreign currencies or currency units or if the principal of, or any
premium and interest on, any series of debt securities is payable in one or
more foreign currencies or currency units, the restrictions, elections, general
tax considerations, specific terms and other information with respect to such
debt securities and such foreign currency or currency units will be set forth
in the related prospectus supplement.

   Some of the debt securities may be issued as original issue discount
securities (bearing no interest or bearing interest at a rate which at the time
of issuance is below market rates) to be sold at a substantial discount below
their principal amount. The prospectus supplement will describe the federal
income tax considerations and other special considerations which apply to any
original issue discount securities.

Denominations, Registration and Transfer

   The debt securities may be issued as registered securities, bearer
securities or both. Debt securities may be issued in the form of one or more
global securities, as described below under the section of this prospectus
captioned "Global Securities." Unless otherwise provided in the prospectus
supplement, registered securities denominated in U.S. dollars will be issued
only in denominations of $1,000 or any integral multiple thereof and bearer
securities denominated in U.S. dollars will be issued only in denominations of
$5,000 with coupons attached. A global security will be issued in a
denomination equal to the aggregate principal amount of outstanding debt
securities represented by that global security. The prospectus supplement
relating to debt securities denominated in a foreign or composite currency will
specify the denominations in which the debt securities will be issued.

   During the "restricted period" as defined in Treasury Regulation Section
1.163-5(c)(2)(i)(D)(7), no bearer security will be mailed or otherwise
delivered to any location in the United States and a bearer security may be
delivered during such restricted period only if the person entitled to receive
the bearer security furnishes proper written certification that the bearer
security is owned by:

  . a person that is not a U.S. person;

  . a qualifying foreign branch of a U.S. financial institution; or

  . a U.S. person who acquired the obligation through the qualifying foreign
    branch of a U.S. financial institution and holds the obligation through
    that qualifying foreign branch of a U.S. financial institution on the
    date of certification; or

  . a financial institution for resale during the restricted period but not
    for resale directly or indirectly to a U.S. person or to a person within
    the United States or its possessions.

   Registered securities of any series may be exchanged for other registered
securities of the same series and of a like aggregate principal amount and
tenor of different authorized denominations. In addition, if debt securities of
any series may be issued as both registered securities and as bearer
securities, at the option of the holder upon written request, and subject to
the terms of the indenture, bearer securities (with all unmatured coupons,
except as provided below, and all matured coupons in default attached) of such
series may be exchanged for registered securities of the same series of any
authorized denominations and of a like aggregate principal amount and tenor.
Unless otherwise indicated in the prospectus supplement, any bearer security
surrendered in exchange for a registered security between a record date and the
relevant date for payment of interest will be surrendered without the coupon
relating to the date for payment of interest attached, and interest may be paid
only to the holder of such coupon when due in accordance with the terms of the
indenture. Except as indicated in the prospectus supplement, bearer securities
will not be issued in exchange for registered securities.

                                       10
<PAGE>

   Debt securities may be presented for exchange as described in the previous
paragraph, and registered securities, other than a global security, may be
presented for registration of transfer, with the form of transfer duly
executed, at the office of the security registrar designated by Dow or at the
office of any transfer agent designated by Dow for that purpose, without
service charge and upon payment of any taxes and other governmental charges as
described in the indenture. The transfer or exchange will be effected when the
security registrar or the transfer agent is satisfied with the documents of
title and identity of the person making the request. Dow has initially
appointed the trustee as the security registrar under the indenture. If a
prospectus supplement refers to any transfer agent initially designated by Dow
with respect to any series of debt securities, Dow may at any time cancel the
designation of the transfer agent or approve a change in the location through
which such transfer agent acts, except that:

  . if debt securities of a series may be issued only as registered
    securities, Dow will be required to maintain a transfer agent in each
    place of payment for such series; and

  . if debt securities of a series are issuable as bearer securities, Dow
    will be required to maintain (in addition to the security registrar) a
    transfer agent in a place of payment for such series located outside the
    United States.

Dow may at any time designate additional transfer agents with respect to any
series of debt securities.

   In the event of any redemption in part, Dow will not be required to:

  . issue, register the transfer of or exchange debt securities of any series
    during a period beginning at the opening of business 15 days before the
    date of the mailing of a notice of redemption of debt securities of that
    series selected to be redeemed and ending at the close of business on:

   -- if debt securities of the series may be issued only as registered
      securities, the day of mailing of the relevant notice of redemption;
      and

   -- if debt securities of the series may be issued as bearer securities,
      the day of the first publication of the notice of redemption or, if
      debt securities of the series also may be issued as registered
      securities and there is no publication, the mailing of the relevant
      notice of redemption;

  . register the transfer of or exchange any registered security or portion
    of any registered security called for redemption, except the unredeemed
    portion of any registered security being redeemed in part; or

  . exchange any bearer security called for redemption, except to exchange
    the bearer security for a registered security of that series and like
    tenor which is immediately surrendered for redemption.

Payments and Paying Agents

   Unless otherwise indicated in the prospectus supplement, Dow will pay the
principal of and any premium and interest on registered securities other than a
global security at the office of one or more paying agents designated by Dow.
At Dow's option, however, Dow may pay any interest by check mailed to the
address of the payee entitled to the interest at the address which appears in
the security register. Unless otherwise indicated in the prospectus supplement,
payment of any installment of interest on registered securities will be made to
the person in whose name the registered security is registered at the close of
business on the record date for such interest payment.

   Unless otherwise indicated in the prospectus supplement, Dow may pay the
principal of and any premium and interest on bearer securities, subject to
applicable laws and regulations, at the offices of one or more paying agents
outside the United States designated by Dow. At Dow's option, however, Dow may
pay any interest by check or by wire transfer to an account maintained by the
payee outside the United States. Unless otherwise indicated in the prospectus
supplement, payment of interest on bearer securities on any interest payment
date will be made only upon surrender of the coupon relating to such interest
payment date. No payment with respect to any bearer security will be made at
any office or agency of Dow in the United States by check mailed to any address
in the United States or by transfer to an account maintained in the United
States.

                                       11
<PAGE>

Payments will not be made in respect of bearer securities or coupons related to
such bearer securities upon presentation to or any other demand for payment
from Dow or its paying agents within the United States. Dow will pay the
principal of and any premium and interest on bearer securities denominated and
payable in U.S. dollars, however, at the office of Dow's paying agent in the
United States if, and only if:

  . payment of the full amount in U.S. dollars at all offices or agencies
    outside the United States is illegal or effectively precluded by exchange
    controls or other similar restrictions; and

  . Dow has delivered to the trustee an opinion of counsel to that effect.

   Unless otherwise indicated in the prospectus supplement, the principal
office of the trustee in New York City will be Dow's sole paying agent for
payments with respect to debt securities which may be issued only as registered
securities. Any paying agent outside the United States and any other paying
agent in the United States initially designated by Dow for the debt securities
will be named in the prospectus supplement. Dow may at any time designate
additional paying agents, or cancel the designation of any paying agent or
approve a change in the office through which any paying agent acts, except
that:

  . if debt securities of a series may be issued only as registered
    securities, Dow will be required to maintain a paying agent in each place
    of payment for such series; and

  . if debt securities of a series may be issued as bearer securities, Dow
    will be required to maintain:

   -- a paying agent in each place of payment for such series in the United
      States for payments with respect to any registered securities of such
      series and for payments with respect to bearer securities of such
      series in the circumstances described above;

   -- a paying agent in each place of payment located outside the United
      States where debt securities of such series and any coupons related to
      the debt securities may be presented and surrendered for payment,
      provided that if the debt securities of such series are listed on The
      International Stock Exchange, London or the Luxembourg Stock Exchange
      or any other stock exchange located outside the United States and such
      stock exchange so requires, Dow will maintain a paying agent in London
      or Luxembourg City or any other required city located outside the
      United States for debt securities of such series; and

   -- a paying agent in each place of payment located outside the United
      States where, subject to applicable laws and regulations, registered
      securities of such series may be surrendered for registration of
      transfer or exchange and where notices and demands to or upon Dow may
      be served.

   All amounts paid by Dow to a paying agent for the payment of principal of
and any premium and interest on any debt security that remain unclaimed at the
end of two years after the principal, premium or interest has become due and
payable will be repaid to Dow and after such repayment the holder of the debt
security or any coupon related to the debt security may look only to Dow for
the payment of principal of and any premium and interest on any such debt
security.

Global Securities

   The debt securities of a series may be issued in whole or in part in the
form of one or more global securities that will be deposited with, or on behalf
of, a depositary identified in the prospectus supplement. Global securities may
be issued in either registered or bearer form and in either temporary or
permanent form. Unless and until it is exchanged for debt securities in
definitive form, a temporary global security in registered form may not be
transferred except as a whole by:

  . the depositary for such global security to a nominee of such depositary;

  . a nominee of the depositary for such global security to such depositary
    or another nominee of such depositary; or

  . the depository for such global security or any such nominee to a
    successor of such depositary or a nominee of such successor.

                                       12
<PAGE>

   Unless otherwise indicated in the prospectus supplement, registered debt
securities issued in global form will be represented by one or more global
securities deposited with, or on behalf of, The Depository Trust Company, New
York, New York, or other depositary Dow appoints and registered in the name of
the depository or its nominee. The debt securities will not be issued in
definitive form unless otherwise provided in the prospectus supplement.

   DTC will act as securities depository for the securities. The debt
securities will be issued as fully-registered securities registered in the name
of Cede & Co. (DTC's partnership nominee). One fully-registered global security
will be issued with respect to each $200 million of principal amount and an
additional certificate will be issued with respect to any remaining principal
amount of debt securities.

   DTC is a limited-purpose trust company organized under the New York Banking
Law, 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 Securities Exchange
Act of 1934. DTC holds securities that its participants deposit with DTC. DTC
also facilitates the settlement among participants of securities transactions,
such as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Direct participants
include securities brokers and dealers, banks, trust companies, clearing
corporations, and certain other organizations. DTC is owned by a number of its
direct participants and by the New York Stock Exchange, Inc., the American
Stock Exchange, Inc., and the National Association of Securities Dealers, Inc.
Access to the DTC system is also available to indirect participants such as
securities brokers and dealers, banks, and trust companies that clear through
or maintain a custodial relationship with a direct participant, either directly
or indirectly. The rules applicable to DTC and its participants are on file
with the SEC.

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

   To facilitate subsequent transfers, all debt securities deposited by
participants with DTC are registered in the name of DTC's partnership nominee,
Cede & Co. The deposit of debt securities with DTC and their registration in
the name of Cede & Co. will effect no change in beneficial ownership. DTC has
no knowledge of the actual beneficial owners of the debt securities; DTC's
records reflect only the identity of the direct participants to whose accounts
the debt securities are 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.

   Delivery of notices and other communications by DTC to direct participants,
by direct participants to indirect participants, and by direct participants and
indirect participants to beneficial owners will be governed by arrangements
among them, subject to any statutory or regulatory requirements as may be in
effect from time to time.

   Redemption notices will be sent to DTC. If less than all of the debt
securities within an issue are being redeemed, DTC's practice is to determine
by lot the amount of the interest of each direct participant in such issue to
be redeemed.

                                       13
<PAGE>

   Neither DTC nor Cede & Co will consent or vote with respect to debt
securities. Under its usual procedures, DTC mails an omnibus proxy to Dow as
soon as possible after the record date. The omnibus proxy assigns Cede & Co.'s
consenting or voting rights to those direct participants to whose accounts the
debt securities are credited on the record date (identified in a listing
attached to the omnibus proxy).

   Principal and interest payments, if any, on the debt securities will be made
to Cede & Co., as nominee of DTC. DTC's practice is to credit direct
participants' accounts, upon DTC's receipt of funds and corresponding detail
information from Dow or the trustee, on the applicable payable date in
accordance with their respective holdings shown on DTC's records. 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 that participant and not of DTC, the trustee or Dow, subject
to any statutory or regulatory requirements as may be in effect from time to
time. Payment of principal and interest to Cede & Co. is Dow's responsibility
or the trustee's, disbursement of payments to direct participants shall be the
responsibility of DTC, and disbursement of payments to beneficial owners is the
responsibility of direct and indirect participants.

   A beneficial owner must give notice to elect to have its debt securities
purchased or tendered, through its participant, to a tender agent, and shall
effect delivery of debt securities by causing the direct participants to
transfer the participant's interest in the debt securities, on DTC's records,
to a tender agent. The requirement for physical delivery of debt securities in
connection with an optional tender or a mandatory purchase will be deemed
satisfied when the ownership rights in the debt securities are transferred by
direct participants on DTC's records and followed by a book-entry credit of
tendered debt securities to the tender agent's account.

   DTC may discontinue providing its services as securities depository with
respect to the debt securities at any time by giving reasonable notice to Dow
or the trustee. Under these circumstances, in the event Dow does not appoint a
successor securities depository, debt security certificates will be printed and
delivered.

   Dow may decide to discontinue use of the system of book-entry transfers
through DTC (or a successor securities depository). In that event, debt
security certificates will be printed and delivered.

   The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that Dow believes to be reliable, but Dow takes
no responsibility for their accuracy.

Limitations on Issuance of Bearer Securities

   Bearer securities may not be offered, sold, resold or delivered during the
"restricted period" as defined in Treasury Regulation Section 1.163-
5(c)(2)(i)(D)(7) in the United States or its possessions or to U.S. persons
other than to a qualifying foreign branch of a institution, and any
underwriters, participating in the offering of debt securities must agree that
they will not:

  . offer any bearer securities for sale or resale in the United States or
    its possessions or to United States persons, other than a qualifying
    foreign branch of a U.S. financial institution); nor

  . deliver bearer securities within the United States.

   Bearer securities and any coupons related to bearer securities will bear a
legend substantially to the following effect: "Any United States person who
holds this obligation will be subject to limitations under the United States
income tax laws, including the limitations provided in Section 165(j) and
1287(a) of the Internal Revenue Code". Under Sections 165(j) and 1287(a) of the
Internal Revenue Code, holders that are U.S. persons, with certain exceptions,
will not be entitled to deduct any loss on bearer securities and must treat as
ordinary income any gain realized on the sale or other disposition (including
the receipt of principal) of bearer securities.

   The term "qualifying foreign branch of a United States financial
institution" means a branch located outside the United States of a U.S.
securities clearing organization, bank or other financial institution that
holds

                                       14
<PAGE>

customers' securities in the ordinary course of its trade or business and that
provides a certificate within a reasonable time, or a blanket certificate in
the year the debt security is issued or either of the preceding two calendar
years, stating that it agrees to comply with the requirements of Section
165(j)(3)(A), (B) or (C) of the Internal Revenue Code and its regulations.

   The term "U.S. person" means a citizen or resident of the United States, a
corporation, partnership or other entity created or organized in or under the
laws of the United States or of any political subdivision of the United States,
and an estate or trust the income of which is subject to U.S. federal income
taxation regardless of its source.

   The term "United States" means the United States of America, including the
states and the District of Columbia.

   The term "possessions" includes Puerto Rico, the U.S. Virgin Islands, Guam,
American Samoa, Wake Island and the Northern Mariana Islands.

Certain Covenants of Dow

 Limitations on Liens

   Subject to the exceptions described below and those set forth under
"Exempted Indebtedness," Dow may not, and may not permit any restricted
subsidiary to create or permit to exist any lien on any principal property,
additions to principal property or shares of capital stock of any restricted
subsidiary without equally and ratably securing the debt securities. This
restriction will not apply to certain permitted liens, including:

  . liens on principal property existing at the time of its acquisition and
    certain purchase money mortgages;

  . liens existing on the date of the indenture;

  . liens on property or shares of capital stock, or arising out of any
    indebtedness of any corporation existing at the time the corporation
    becomes or is merged into Dow or a restricted subsidiary;

  . liens which secure debt owing to Dow or a subsidiary by a restricted
    subsidiary;

  . liens in connection with the issuance of tax-exempt industrial
    development or pollution control bonds or other similar bonds issued
    pursuant to Section 103(b) of the Internal Revenue Code to finance all or
    any part of the purchase price of or the cost of construction, equipping
    or improving property, provided that those liens are limited to the
    property acquired or constructed or the improvement and to substantially
    unimproved real property on which such construction or improvement is
    located; provided further, that Dow and restricted subsidiaries may
    further secure all or any part of such purchase price or the cost of
    construction of such improvements and personal property by an interest on
    additional property of Dow and restricted subsidiaries only to the extent
    necessary for the construction, maintenance and operation of, and access
    to, such property so acquired or constructed or such improvement;

  . liens arising from assignments of money due under contracts with the
    United States or any State, or any department, agency or political
    subdivision of the United States or any State;

  . liens in favor of any customer arising in respect of certain payments
    made by or on behalf of a customer for goods produced for or services
    rendered to customers in the ordinary course of business not exceeding
    the amount of those payments;

  . any extension, renewal or replacement of any lien referred to in any of
    the previous clauses; and

  . certain statutory liens, liens for taxes and certain other liens.

 Limitation on Sale and Lease-Back Transactions

   Subject to the exceptions set forth below under the section of this
prospectus captioned "Exempted Indebtedness," sale and lease-back transactions
by Dow or any restricted subsidiary of any principal property

                                       15
<PAGE>

are prohibited (except for temporary leases for a term, including any renewal
thereof, of not more than three years and except for leases between Dow and a
subsidiary or between subsidiaries) unless the net proceeds of such sale and
leaseback transaction are at least equal to the fair value of the property.

 Exempted Indebtedness

   Dow or any restricted subsidiary may create or assume liens or enter into
sale and lease-back transactions not otherwise permitted under the limitations
on liens and sale and lease-back transactions described above, so long as at
that time and after giving effect to the lien or sale and lease-back
transaction, the sum of:

  (1) the aggregate outstanding indebtedness of Dow and its consolidated
      subsidiaries incurred after the date of the indenture and secured by
      such liens relating to principal property; plus

  (2) the aggregate discounted value of the obligations for rental payments
      in respect to such sale and lease-back transactions relating to
      principal property does not exceed 10% of consolidated net tangible
      assets.

There are no covenants or provisions contained in the indenture which protect
holders of debt securities in the event of a highly leveraged transaction.

 Certain Definitions

   The following are the meanings of terms that are important in understanding
the covenants previously described:

  . ""consolidated net tangible assets" means the total assets of Dow and its
    consolidated subsidiaries as shown on or reflected in its balance sheet,
    less:

   -- all current liabilities, excluding current liabilities which could be
      classified as long-term debt under generally accepted accounting
      principles and current liabilities which are by their terms extendible
      or renewable at the obligor's option to a time more than 12 months
      after the time as of which the amount of current liabilities is being
      computed;

   -- advances to entities accounted for on the equity method of accounting;
      and

   -- intangible assets.

  .  "intangible assets" means the aggregate value, net of any applicable
     reserves, as shown on or reflected in Dow's balance sheet, of:

   -  all trade names, trademarks, licenses, patents, copyrights and
      goodwill;

   -  organizational and development costs;

   -  deferred charges, other than prepaid items such as insurance, taxes,
      interest, commissions, rents and similar items and tangible assets
      being amortized; and

   -  amortized debt discount and expense, less unamortized premium.

  . ""principal property" means any manufacturing facility having a gross
    book value in excess of 1% of consolidated net tangible assets that is
    owned by Dow or any restricted subsidiary and located within the United
    States, excluding its territories and possessions and Puerto Rico, other
    than any facility or portion of a facility which Dow's board of directors
    reasonably determines is not material to the business conducted by Dow
    and its subsidiaries as a whole.

  .  "restricted subsidiary" means any subsidiary:

   -- of which substantially all of the property of is located, and
      substantially all of the business is carried on, within the United
      States, excluding its territories and possessions and Puerto Rico; and

                                       16
<PAGE>

   -- which owns or operates one or more principal properties; provided,
      however, restricted subsidiary shall not include a subsidiary which is
      primarily engaged in the business of a finance or insurance company,
      and branches of such finance or insurance company.

  .  "subsidiary" means each corporation of which more than 50% of the
     outstanding voting stock is owned, directly or indirectly, by Dow or one
     or more of its subsidiaries, or by Dow and one or more of its
     subsidiaries.

Consolidation, Merger and Sale of Assets

   Dow may not merge or consolidate or sell or convey all or substantially all
of its assets unless:

  .  the successor corporation is Dow or is a domestic corporation which
     assumes Dow's obligations on the debt securities and under the
     indenture; and

  . after giving effect to such transaction, Dow or the successor corporation
    would not be in default under the indenture.

Events of Default

   With respect to any series of debt securities, any one of the following
events will constitute an event of default under the indenture:

  (1) default by Dow for 30 days in the payment of any installment of
      interest on the debt securities of such series;

  (2) default by Dow in the payment of any principal on the debt securities
      of such series;

  (3) default by Dow in the payment of any sinking fund installment;

  (4) default by Dow in the performance of any of the covenants or warranties
      contained in the indenture for the benefit of the debt securities of
      such series which is not remedied within a period of 90 days after
      receipt of written notice by Dow from the trustee or by Dow and the
      trustee for the holders of not less than 25% in principal amount of the
      debt securities of such series then outstanding;

  (5) certain events of bankruptcy, insolvency or reorganization of Dow; or

  (6) any other event of default established in accordance with the indenture
      with respect to any series of debt securities.

   No event of default described in clauses (1), (2), (3), (4) or (6) above
with respect to a particular series of debt securities necessarily constitutes
an event of default with respect to any other series of debt securities.

   The indenture provides that if an event of default under clauses (1), (2),
(3), (4) or (6) above (but only if the event of default under clause (4) or (6)
is with respect to less than all series of debt securities then outstanding)
shall have occurred and be continuing, either the trustee or the holders of not
less than 25% in aggregate principal amount of the then outstanding debt
securities of the series affected by such event of default, each such series
treated as a separate class, may declare the principal of all the debt
securities of each such series, together with accrued interest, to be due and
payable immediately. If an Event of Default under clause (4), (5) or (6) above
(but only if the event of default under clause (4) or (6) is with respect to
all of the series of debt securities then outstanding) shall have occurred and
be continuing, either the trustee or the holders of not less than 25% in the
aggregate principal amount of all the debt securities then outstanding, treated
as one class, may declare the principal of all the debt securities, together
with accrued interest, to be due and payable immediately. Upon certain
conditions, such declaration (including a declaration caused by a default in
the payment of principal or interest, the payment for which has subsequently
been provided) may be annulled by the holders of a majority in principal amount
of the debt securities of the series then outstanding, each such series treated
as a separate class, or all debt securities treated as one class, as the case
may be, as were entitled to declare such default. In addition, past defaults
may be waived by the holders of a majority in

                                       17
<PAGE>

principal amount of the debt securities of the series then outstanding, each
series treated as a separate class, or all debt securities treated as one
class, as the case may be, as were entitled to declare such default, except a
default in the payment of the principal of or interest on the debt securities
or in respect of a covenant or provision of the indenture which cannot be
modified or amended without the approval of the holder of each debt security so
affected.

   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 debt securities before exercising any right
or power under the indenture at the request of the holders of the debt
securities. The indenture also provides that the holders of a majority in
principal amount of the outstanding debt securities of all series affected,
each series treated as a separate class, may direct the time, method and place
of conducting any proceeding for any remedy available to the trustee, or
exercising any trust or power conferred on the trustee, with respect to the
debt securities of such series.

   The indenture requires Dow to file annually with the trustee a certificate
as to the absence of any default or specifying any default that exists.

Satisfaction and Discharge of Indenture

   The indenture with respect to any series, except for certain specified
surviving obligations, including Dow's obligation to pay the principal of and
interest on the debt securities of such series, will be discharged and canceled
upon the satisfaction of certain conditions, including:

  . payment of all the debt securities of such series; or

  . the deposit with the trustee of cash or U.S. government obligations or a
    combination of cash or U.S. government obligations sufficient for such
    payment or redemption in accordance with the indenture and the terms of
    the debt securities of such series.

Modification and Waiver

   Dow and the trustee may modify and amend the indenture with the consent of
the holders of more than 50% of the principal amount of the outstanding debt
securities of each series which is affected. No supplemental indenture may:

  . extend the final maturity of, reduce the rate or extend the time of
    payment of interest on, reduce the principal amount of, or reduce any
    amount payable on any redemption of, any debt securities without the
    consent of the holder of each debt security affected; or

  . reduce the percentage in principal amount of outstanding debt securities
    of any series, the consent of whose holders is required for any
    supplemental indenture, without the consent of the holders of all
    outstanding debt securities.

Governing Law

   The indenture and the debt securities are governed by and construed in
accordance with the laws of the State of New York.

Information About the Trustee

   Dow maintains banking relationships in the ordinary course of business with
the trustee. The trustee's principal corporate trust office is located at 1
Bank One Plaza, Chicago, Illinois 60670-0126. The trustee's principal office in
New York City is located at 14 Wall Street, Eighth Floor, New York, New York
10005.

                                       18
<PAGE>

                      DESCRIPTION OF WARRANTS TO PURCHASE
                        COMMON STOCK OR PREFERRED STOCK

   Dow may issue, alone or together with common stock or preferred stock, stock
warrants for the purchase of common stock or preferred stock. The stock
warrants will be issued under a stock warrant agreement to be entered into
between Dow and a bank or trust company, as stock warrant agent, at the time of
issue. A copy of the form of the stock warrant agreement and the stock warrant
certificate for both common stock and preferred stock is filed as an exhibit to
the registration statement of which this prospectus is a part. The following
summary of the material provisions of the stock warrant agreement and the stock
warrant certificate does not purport to be complete and is subject to, and
qualified in its entirety by reference to, all the provisions of the stock
warrant agreement and the stock warrant certificate, including the defined
terms.

General

   A prospectus supplement will describe the terms of the stock warrants
offered, the stock warrant agreement relating to the stock warrants and the
stock warrant certificates representing the stock warrants, including the
following:

  . the offering price, if any;

  . the designation and terms of the common stock or preferred stock that may
    be purchased upon exercise of the stock warrants;

  . if applicable, the date on and after which the stock warrants and the
    related securities will be separately transferable;

  . the number of shares of common stock or preferred stock that may be
    purchased upon exercise of one stock warrant and the initial price at
    which such shares may be purchased upon exercise;

  . the date on which the right to exercise the stock warrants will begin and
    the date on which such right will expire;

  . a discussion of material U.S. federal income tax considerations;

  . the call provisions, if any;

  . the currency, currencies or currency units in which the offering price,
    if any, and exercise price are payable;

  . the antidilution provisions of the stock warrants; and

  . any other terms of the stock warrants.

   The shares of common stock or preferred stock to be issued upon exercise of
the stock warrants will, when issued in accordance with the stock warrant
agreement, be fully paid and nonassessable.

Exercise of Stock Warrants

   Stock warrants may be exercised by surrendering to the stock warrant agent
the stock warrant certificate with the form of election to purchase on the
reverse side of the certificate duly completed and signed by the warrant
holder, or its duly authorized agent, with such signature guaranteed by a bank
or trust company, by a broker or dealer which is a member of the National
Association of Securities Dealers, Inc. or by a member of a national securities
exchange. The form of election should indicate the warrant holder's election to
exercise all or a portion of the stock warrants evidenced by the certificate.
Surrendered stock warrant certificates must be accompanied by payment of the
aggregate exercise price of the stock warrants to be exercised, as set forth in
the prospectus supplement. The payment should be made in U.S. dollars, unless
otherwise provided in the prospectus supplement. Upon the stock warrant agent's
receipt of the surrendered stock warrant certificates and payment of the
aggregate exercise price of the stock warrants, the stock warrant agent will
request that the

                                       19
<PAGE>

transfer agent issue and deliver to or upon the written order of the exercising
warrant holder, a certificate stating the number of shares of common stock or
preferred stock purchased. If less than all of the stock warrants evidenced by
any stock warrant certificate are exercised, the stock warrant agent will
deliver to the exercising warrant holder a new stock warrant certificate
representing the unexercised stock warrants.

No Rights as Stockholders

   Holders of stock warrants, by virtue of being such holders, will not be
entitled to vote, consent, receive dividends, receive notice as shareholder
with respect to any meeting of stockholders for election of directors of Dow or
any other matter, or exercise any rights whatsoever as stockholders of Dow.

                          DESCRIPTION OF DEBT WARRANTS

   Dow may issue, alone or together with debt securities, debt warrants for the
purchase of debt securities. The debt warrants will be issued under debt
warrant agreements to be entered into between Dow and a bank or trust company,
as debt warrant agent, at the time of issue. A copy of the form of the debt
warrant agreement and debt warrant certificate is incorporated by reference as
an exhibit to the registration statement of which this prospectus forms a part.
The following summary of certain provisions of the debt warrant agreement and
the debt warrant certificates does not purport to be complete and is subject
to, and qualified in its entirety by reference to, all the provisions of the
debt warrant agreement and the debt warrant certificates, including the defined
terms.

General

   A prospectus supplement will describe the terms of the debt warrants
offered, the debt warrant agreement relating to the debt warrants and the debt
warrant certificates representing the debt warrants, including the following:

  . the designation, aggregate principal amount and terms of the debt
    securities purchasable upon exercise of the debt warrants and the
    procedures and conditions relating to the exercise of the debt warrants;

  . the designation and terms of any related debt securities with which the
    debt warrants are issued and the number of debt warrants issued with each
    debt security;

  . the date, if any, on and after which the debt warrants and the related
    debt securities may be separately transferred;

  . the principal amount of debt securities purchasable upon exercise of debt
    warrants and the price at which such principal amount of debt securities
    may be purchased upon exercise;

  . the date on which the right to exercise the debt warrants shall commence
    and the date on which the right shall expire;

  . if the debt securities purchasable upon exercise of the debt warrants are
    original issue discount debt securities, a discussion of the material
    Federal income tax considerations applicable to the debt securities; and

  . whether the debt warrants represented by the debt warrant certificates
    will be issued in registered or bearer form, and, if registered, where
    they may be transferred and registered.

   Debt warrant certificates may be exchanged for new debt warrant certificates
of different denominations and debt warrants may be exercised at the corporate
trust office of the debt warrant agent or any other office indicated in the
prospectus supplement.

                                       20
<PAGE>

No Rights as Holders of Debt Securities

   Prior to the exercise of their debt warrants, holders of debt warrants will
not have any of the rights of holders of the debt securities purchasable upon
such exercise (except to the extent that consent of holders of debt warrants
may be required for certain modifications of the terms of the indenture and a
series of debt securities issuable upon exercise of the debt warrants). In
addition, holders of debt warrants will not be entitled to payments of
principal of (and premium, if any) or interest, if any, on the debt securities
purchasable upon exercise.

Exercise of Debt Warrants

   Each debt warrant will entitle the holder to purchase for cash the principal
amount of debt securities at the exercise price set forth or to be determined
as set forth in the prospectus supplement. Debt warrants may be exercised at
any time up to the close of business on the expiration date set forth in the
prospectus supplement. After the close of business on the expiration date,
unexercised debt warrants will become void.

   Debt warrants may be exercised in the manner set forth in the prospectus
supplement. Upon receipt of payment and the properly completed and duly
executed warrant certificate at the corporate trust office of the debt warrant
agent or any other office indicated in the prospectus supplement, Dow will, as
soon as practicable, forward the debt securities purchased upon such exercise.
If less than all of the debt warrants represented by the debt warrant
certificate are exercised, a new debt warrant certificate will be issued for
the remaining amount of debt warrants.

                              PLAN OF DISTRIBUTION

   Dow may sell the securities:

  . directly to purchasers, or

  . through agents, underwriters, or dealers, or

  . through a combination of any of these methods of sale.

   Dow may distribute the securities from time to time in one or more
transactions at a fixed price or prices, which may be changed, or at market
prices prevailing at the time of sale, at prices related to the prevailing
market prices or at negotiated prices.

   Dow may designate agents to solicit offers to purchase the securities from
time to time. These agents may be deemed to be underwriters, as defined in the
Securities Act of 1933, involved in the offer or sale of the securities. The
prospectus supplement will name the agents and any commissions Dow pays them.
Agents may be entitled to indemnification by Dow against certain liabilities,
including liabilities under the Securities Act of 1933, under agreements
between Dow and the agents, and the agents or their affiliates may extend
credit to or engage in transactions with or perform services for Dow in the
ordinary course of business. Unless otherwise indicated in the prospectus
supplement, any agent will be acting on a reasonable efforts basis for the
period of its appointment.

   If Dow uses any underwriters in the sale, Dow will enter into an
underwriting agreement with them at the time of sale and the names of the
underwriters and the terms of the transaction will be set forth in the
prospectus supplement that the underwriters use to make resales of the
securities. The underwriters may be entitled under the relevant underwriting
agreement to indemnification by Dow against certain liabilities, including
liabilities under the Securities Act of 1933, and the underwriters or their
affiliates may extend credit to or engage in transactions with or perform
services for Dow in the ordinary course of business.

   If Dow uses dealers in the sale of the securities, Dow will sell the
securities to those dealers, as principal. The dealers may then resell the
securities to the public at varying prices to be determined by them at the time

                                       21
<PAGE>

of resale. Dealers may be entitled to indemnification by Dow against certain
liabilities, including liabilities under the Securities Act of 1933, and the
dealers or their affiliates may extend credit to or engage in transactions with
or perform services for Dow in the ordinary course of business.

   Shares of Dow common stock are principally traded on the New York Stock
Exchange. Shares of Dow common stock also are listed on the Chicago, Pacific,
Amsterdam, Berlin, Brussels, Dusseldorf, Frankfurt, Hamburg, Hannover, London,
Paris, Switzerland and Tokyo exchanges and are traded on the Toronto, Boston,
Cincinnati and Philadelphia Exchanges. Other than the common stock, Dow does
not propose to list the offered securities on a securities exchange, and any
underwriters or dealers will not be obligated to make a market in the offered
securities. Dow may elect to list any series of offered securities on an
exchange, and in the case of the common stock, on any additional exchange, but,
unless otherwise specified in the applicable prospectus supplement, Dow will
not be obligated to do so. Dow can give no assurance as to the liquidity of the
trading market for any of the offered securities.

                                 LEGAL MATTERS

   Certain legal matters in connection with the securities offered by this
prospectus will be passed upon for Dow by John Scriven, Esq., Dow's Vice
President, General Counsel and Secretary and for any underwriters or agents by
Mayer, Brown & Platt, Chicago, Illinois. As of September 30, 1999, Mr. Scriven
beneficially owned 11,619 shares of Dow common stock and no shares of Dow
preferred stock, and held options to purchase 105,575 shares of Dow common
stock, of which options to purchase 61,166 shares of Dow common stock were
exercisable. The opinions of Mr. Scriven and Mayer, Brown & Platt may be
conditioned upon and may be subject to certain assumptions regarding, future
action required to be taken by Dow and any underwriter(s), dealer(s) or
agent(s) in connection with the issuance and sale of any securities. The
opinions of Mr. Scriven and Mayer, Brown & Platt and with respect to securities
may be subject to other conditions and assumptions, as indicated in the
prospectus supplement. Mayer, Brown & Platt from time to time represents Dow in
connection with certain matters.

                                    EXPERTS

   The Dow consolidated financial statements and related financial statement
schedule incorporated by reference in this registration statement from Dow'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 in reliance upon the report of such firm, given upon their
authority as experts in accounting and auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

   Dow files reports, proxy statements and other information with the
Securities and Exchange Commission under the Securities Exchange Act of 1934.
You may read and copy that information at the following locations of the
Securities and Exchange Commission:

  Public Reference Room     New York Regional Office   Chicago Regional Office
  450 Fifth Street, N.W.    7 World Trade Center       Citicorp Center
  Room 1024                 Suite 1300                 500 West Madison Street
  Washington, D.C. 20549    New York, New York 10048   Suite 1400
  1-800-SEC-0330                                       Chicago, Illinois
                                                       60661-2511

   You may also obtain copies of this information by mail from the Public
Reference Section of the Securities and Exchange Commission, 450 Fifth Street,
N.W., Room 1024, Washington, D.C. 20549, at prescribed rates.

                                       22
<PAGE>

   The Securities and Exchange Commission also maintains an Internet world wide
web site that contains reports, proxy statements and other information about
issuers, including Dow, that file electronically with the Securities and
Exchange Commission. The address of that site is http://www.sec.gov.

   You can also inspect reports, proxy statements and other information about
Dow at the offices of the New York Stock Exchange, 20 Broad Street, New York,
New York 10005.

   The Securities and Exchange Commission allows Dow to "incorporate by
reference" information into this prospectus. This means that Dow can disclose
important information to you by referring you to another document filed
separately with the Securities and Exchange Commission. The information
incorporated by reference is considered to be a part of this prospectus, except
for any information that is superseded by information that is included directly
in this document.

   This prospectus incorporates by reference the documents listed below that
Dow has previously filed with the Securities and Exchange Commission. The
documents contain important information about Dow and Dow's financial
condition.

<TABLE>
<CAPTION>
            Dow's Filings with the Commission                  Period
      --------------------------------------------- ----------------------------
      <S>                                           <C>
      Annual Report on Form 10-K................... Year ended December 31, 1998

      Quarterly Reports on Form 10-Q............... Quarters ended:
                                                    .March 31, 1999
                                                    .June 30, 1999

      Current Report on Form 8-K................... Filed on August 4, 1999
</TABLE>

   Dow also incorporates by reference any future filings it makes with the
Securities and Exchange Commission under Sections 13(a), 13(c), 14 or 15(d) of
the Securities Exchange Act of 1934 (1) after the date of the filing of this
registration statement and before its effectiveness and (2) until Dow has sold
all of the securities to which this prospectus relates or the offering is
otherwise terminated. Dow's subsequent filings with the Securities and Exchange
Commission will automatically update and supersede information in this
prospectus.

   You may obtain a copy of any of the documents incorporated by reference in
this document at no cost by writing to or telephoning Dow at the following
address and telephone number:

                       Office of the Corporate Secretary
                            The Dow Chemical Company
                                2030 Dow Center
                            Midland, Michigan 48674
                            Telephone: 517-636-1792

   Dow has not authorized anyone to give any information or make any
representation about Dow that is different from, or in addition to, that
contained in this prospectus or in any of the materials that have been
incorporated into this document. Therefore, if anyone does give you information
of this sort, you should not rely on it. This prospectus is an offer to sell or
buy only the securities described in this document, but only under
circumstances and in jurisdictions where it is lawful to do so. The information
contained in this document speaks only as of the date of this document unless
the information specifically indicates that another date applies.

                                       23


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