MILLIPORE CORP
SC 13E4, 1994-08-25
LABORATORY ANALYTICAL INSTRUMENTS
Previous: MERRILL LYNCH & CO INC, 424B3, 1994-08-25
Next: NORDSON CORP, 11-K, 1994-08-25



<PAGE>   1
================================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            ------------------------
 
                                 SCHEDULE 13E-4
                         ISSUER TENDER OFFER STATEMENT
     (PURSUANT TO SECTION 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934)

                            ------------------------
 
                             MILLIPORE CORPORATION
                  (Name of Issuer and Person Filing Statement)
 
                    COMMON STOCK, PAR VALUE $1.00 PER SHARE
                         (Title of Class of Securities)
 
                                   601073109
                     (CUSIP Number of Class of Securities)

                            ------------------------
 
                                 GEOFFREY NUNES
                   SENIOR VICE PRESIDENT AND GENERAL COUNSEL
                                 80 Ashby Road
                          Bedford, Massachusetts 01730
                                 (617) 533-2209
      (Name Address and Telephone Number, of Person Authorized to Receive
      Notices and Communications on Behalf of the Person Filing Statement)

                            ------------------------
 
                                   COPIES TO:
                             STEVEN F. SCOTT, ESQ.
                                  ROPES & GRAY
                            One International Place
                                Boston, MA 02110
                                 (617) 951-7000

                            ------------------------
 
                                August 25, 1994
     (Date Tender Offer First Published, Sent or Given to Security Holders)
 
<TABLE>
                           CALCULATION OF FILING FEE
================================================================================
<CAPTION>
       Transaction valuation(1)                Amount of filing fee
- -----------------------------------------------------------------------------
             <S>                                      <C>
             $210,000,000                             $42,000
 
================================================================================
</TABLE>
 
/ / CHECK BOX IF PART OF THE FEE IS OFFSET AS PROVIDED BY RULE 0-11 (A)(2) AND
IDENTIFY THE FILING WITH WHICH THE OFFSETTING FEE WAS PREVIOUSLY PAID. IDENTIFY
THE PREVIOUS FILING BY REGISTRATION STATEMENT NUMBER, OR THE FORM OR SCHEDULE
AND THE DATE OF ITS FILING.
 
<TABLE>
<S>                                           <C>
Amount previously paid:  Not Applicable       Filing Party:  Not Applicable
Form or registration no.:  Not Applicable     Date filed:  Not Applicable
</TABLE>
 
- ------------
 
(1) Assumes purchase of 3,500,000 shares at $60.00 per share.
================================================================================
<PAGE>   2
 
ITEM 1.  SECURITY AND ISSUER.
 
     (a) The name of the issuer of the securities to which this statement
         relates is Millipore Corporation, a Massachusetts corporation (the
         "Company"). The address of its principal executive office is
         80 Ashby Road, Bedford, Massachusetts 01730 (telephone number (617)
         275-9200).
 
     (b) Information with respect to the exact number of shares of the Company's
         Common Stock, par value $1.00 per share (such shares, together with all
         other outstanding shares of Common Stock of the Company, including the
         associated stock purchase rights issued pursuant to the Shareholder
         Rights Agreement dated as of April 15, 1988 between the Company and The
         First National Bank of Boston, as Rights Agent, are herein referred to
         as "Shares"), being sought and the consideration being offered therefor
         is incorporated herein by reference to Section 1, "Number of Shares;
         Proration; Extension of Offer", of the Offer to Purchase, dated August
         25, 1994 (the "Offer to Purchase"), filed as Exhibit (a)(2) hereto. As
         of August 24, 1994, there were 28,173,782 Shares outstanding. The
         executive officers and directors of the Company have advised the
         Company that they do not intend to tender any Shares pursuant to the
         offer to which this statement relates (the "Offer").
 
     (c) Information with respect to the principal market for and price range of
         Shares is incorporated herein by reference to Section 7, "Price Range
         of Shares; Dividends", of the Offer to Purchase.
 
     (d) Not Applicable.
 
ITEM 2.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
 
     (a) The information set forth in Section 9, "Source and Amount of Funds" of
         the Offer to Purchase is incorporated herein by reference.
 
     (b) Not Applicable.
 
ITEM 3.  PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE ISSUER OR
AFFILIATE.
 
     (a)-(j) Information with respect to the purpose of the Offer, the planned
disposition of the Shares in the Offer and the possible results of the Offer is
incorporated herein by reference to the Introduction, to the "Background,
Purpose of the Offer and Source of Funds" and to Section 8, "Certain Effects of
the Offer", of the Offer to Purchase.
 
ITEM 4.  INTEREST IN SECURITIES OF THE ISSUER.
 
     The information in Section 10, "Certain Information Concerning the Company"
and Section 11, "Transactions and Agreements Concerning Shares", of the Offer to
Purchase is incorporated herein by reference.
 
ITEM 5.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO THE ISSUER'S SECURITIES.
 
     Neither the Company nor, to the Company's knowledge, any of its executive
officers or directors is a party to any material contract, arrangement,
understanding or relationship between them and the Company relating to the
Offer.
 
ITEM 6.  PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED.
 
     The information set forth in Section 15 "Fees" of the Offer to Purchase, is
incorporated herein by reference.
 
ITEM 7.  FINANCIAL INFORMATION.
 
     (a) The information set forth in Section 10, "Certain Information
         Concerning the Company" of the Offer to Purchase and Exhibits (g) and
         (h) hereto is incorporated herein by reference.
 
     (b) The pro forma data set forth in Section 10, "Certain Information
         Concerning the Company" of the Offer to Purchase, is incorporated
         herein by reference.

<PAGE>   3
 
ITEM 8.  ADDITIONAL INFORMATION.
 
     (a) There is no present or proposed material contract, arrangement,
         understanding or relationship between the Company and any of its
         executive officers, directors or affiliates other than any contract,
         arrangement or understanding disclosed pursuant to Item 5 of this
         statement.
 
     (b) There are no applicable regulatory requirements which must be complied
         with or approvals which must be obtained in connection with the Offer.
 
     (c) Not Applicable.
 
     (d) Not Applicable.
 
     (e) Not Applicable.
 
ITEM 9.  MATERIAL TO BE FILED AS EXHIBITS.
 
     (a) (1) Press Release, dated August 24, 1994;
 
          (2) Offer to Purchase, dated August 25, 1994;
 
          (3) Letter, dated August 25, 1994, from John A. Gilmartin, President
     and Chief Executive Officer of the Company, to the stockholders of the
     Company;
 
          (4) Letter, dated August 25, 1994, from J. P. Morgan Securities Inc.
              (Dealer Manager), to brokers, dealers, commercial banks, trust
              companies and nominees;
 
          (5) Form of Letter to Clients;
 
          (6) Letter of Transmittal;
 
          (7) Notice of Guaranteed Delivery;
 
          (8) Form of proposed advertisement to be printed in The Wall Street
     Journal on Thursday, August 25, 1994;
 
          (9) (i) Letter from Savings Plus Plan Trustees to participants in the
     Company's Employees' Participation and Savings Plan, dated August 25, 1994;
     (ii) Form of Notice to Savings Plus Participants; (iii) Form of Tender
     Instruction Form; and
 
        (10) (i) Letter from Millipore Treasury Department; (ii) Form of
Questions and Answers on Stock Option Holders' Tender Rights and Procedures;
and (iii) Form of Notice of Instructions all to holders of stock options in the
Millipore Corporation Combined 1985 Stock Option Plan.
 
     (b) Not Applicable.
 
     (c) Not Applicable.
 
     (d) Not Applicable.
 
     (e) Not Applicable.
 
     (f) Not Applicable.
 
     (g) Audited financial statements for fiscal years 1992 and 1993, set forth
on pages 35-50 of the Company's Annual Report to Stockholders for 1993.
 
     (h) Interim unaudited balance sheets and comparative year to date income
statements of changes in financial position, set forth on pages 2-6 of the
Company's Quarterly Report on Form 10-Q for the period ended June 30, 1994.
 
     (i) Current Report on Form 8-K dated August 24, 1994.
 
                                        2
<PAGE>   4
 
                                   SIGNATURE
 
     After due inquiry and, to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.
 
                                            MILLIPORE CORPORATION
                                                       
                                                      Geoffrey Nunes
                                            BY: .............................
 
                                                TITLE: Senior Vice President
                                                       and General Counsel
 
August 25, 1994
 
                                        3
<PAGE>   5
 
                                 EXHIBIT INDEX
 
(a)  (1) Press Release, dated August 24, 1994;
     (2) Offer to Purchase, dated August 25, 1994;
     (3) Letter, dated August 25, 1994, from John A. Gilmartin President and
         Chief Executive Officer of the Company, to the stockholders of the
         Company;
     (4) Letter, dated August 25, 1994, from J.P. Morgan Securities Inc. (Dealer
         Manager), to brokers, dealers, commercial banks, trust companies and
         nominees;
     (5) Form of Letter to Clients;
     (6) Letter of Transmittal;
     (7) Notice of Guaranteed Delivery;
     (8) Form of proposed advertisement to be printed in The Wall Street Journal
         on Thursday, August 25, 1994;
     (9) (i) Letter from Savings Plus Plan Trustees to participants in the
         Company's Employees' Participation and Savings Plan, dated August 25,
         1994; (ii) Form of Notice to Savings Plus Participants; (iii) Form of
         Tender Instruction Form; and
    (10) (i) Letter from the Company's Treasury Department; (ii) Form of
         Questions and Answers on Stock Option Holders' Rights and 
         Procedures; and (iii) Letter and Form of Notice of Instructions 
         all to holders of stock options in the Millipore Corporation 
         Combined 1985 Stock Option Plan.
(g) Audited financial statements for fiscal years 1992 and 1993, set forth on
    pages 35-50 of the Company's Annual Report to Stockholders for 1993.
(h) Interim unaudited balance sheets and comparative year-to-date income
    statements and statements of changes in financial position, set forth on
    pages 2-6 of the Company's Quarterly Report on Form 10-Q for the period
    ended June 30, 1994.
(i) Current Report on Form 8-K dated August 24, 1994.

<PAGE>   1
                                                                EXHIBIT (a)(1)
For Immediate Release

Contact:  John Glass, Director of Investor Relations
          (617) 275-9200, ext. 2353

          Geoffrey Helliwell, Director of Treasury Operations
          (617) 275-9200, ext. 2032

               Millipore $300 Million Stock Repurchase to Include
                          "Dutch Auction" Self-Tender

Bedford, Massachusetts, August 24, 1994 -- Millipore announced today it was
using a portion of the $300 million in net proceeds from the sale of its
Waters Chromatography and Biosearch Divisions to repurchase up to 3,500,000
shares of its common stock through a Dutch Auction Self-Tender.  Subsequent
to the completion of the self-tender offer, the balance of the proceeds is
expected to be used to fund an open-market repurchase program.  The self-
tender offer will commence on August 25, 1994 and expire at midnight on
September 22, 1994, unless extended.

Under the terms of the offer, the Company will invite shareholders to tender
their shares at prices between $52 and $60, as the shareholder shall specify.
Millipore will determine the single, per share price within that price range
(the "Purchase Price") that will allow it to purchase 3,500,000 shares or
such lesser number as may be tendered.  All shares validly tendered at or
below the Purchase Price will be purchased at the Purchase Price.  If more
than 3,500,000 shares are tendered at or below the Purchase Price, there will
be a proration. The offer is not conditioned on any minimum number of shares
being tendered.  The offer is, however, subject to certain other conditions
set forth in the offer.

J.P. Morgan Securities Inc. is acting as Dealer Manager for the offer and
D.F. King & Co., Inc. is acting as the Information Agent.

Millipore is a multinational company focused on applying purification
technology to critical research and manufacturing problems in global growth
markets, including the pharmaceutical/biotechnology, electronics/industrial,
university/government, and medical/health care markets.





<PAGE>   1
                                                                EXHIBIT (a)(2)

                           OFFER TO PURCHASE FOR CASH
                                       BY
 
                             MILLIPORE CORPORATION
                   UP TO 3,500,000 SHARES OF ITS COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
 
   THE OFFER, THE PRORATION PERIOD AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00
MIDNIGHT, NEW YORK CITY TIME, ON THURSDAY, SEPTEMBER 22, 1994, UNLESS THE OFFER
                                  IS EXTENDED.
 
     Millipore Corporation, a Massachusetts corporation (the "Company"), invites
its stockholders to tender shares of its Common Stock, $1.00 par value per share
(such shares, together with all other outstanding shares of Common Stock of the
Company, including the associated stock purchase rights (the "Rights") issued
pursuant to the Shareholder Rights Agreement dated as of April 15, 1988 between
the Company and The First National Bank of Boston, as Rights Agent, are herein
referred to as the "Shares") at prices not greater than $60.00 nor less than
$52.00 per Share, net to the Seller in cash, specified by such stockholders,
upon the terms and subject to the conditions set forth herein and in the related
Letter of Transmittal (which together constitute the "Offer"). Unless the
context otherwise requires, all references to Shares shall include the
associated Rights. The Company will determine a single per Share price (not
greater than $60.00 nor less than $52.00 per Share) that it will pay for the
Shares validly tendered pursuant to the Offer (the "Purchase Price"), taking
into account the number of Shares so tendered and the prices specified by
tendering stockholders. The Company will select the Purchase Price that will
allow it to purchase 3,500,000 Shares (or such lesser number as are validly
tendered at prices not greater than $60.00 nor less than $52.00 per Share)
pursuant to the Offer. No separate consideration will be paid for the Rights.
Upon the terms and subject to the conditions of the Offer, including the
provisions thereof relating to proration and "odd lot" tenders, the Company will
purchase all Shares validly tendered at prices at or below the Purchase Price
and not withdrawn.
 
     On August 18, 1994, the Company sold substantially all of the assets and
liabilities of its Waters Chromatography Business and on August 22, 1994 sold
substantially all of the assets and liabilities of its non-membrane biosciences
business (the "Biosearch Division") for aggregate net proceeds of approximately
$300 million in cash. A portion of the net proceeds from these sales will be
used to purchase Shares in the Offer.
 
     The purpose of the Offer is to allow those stockholders desiring to receive
cash for a portion, or possibly all, of their Shares an opportunity to do so at
a price in excess of the average trading price for the ten day period
immediately prior to the announcement of the Offer. The Board of Directors of
the Company believes that the Shares represent an attractive investment for the
Company and its continuing stockholders. See "Background, Purpose of the Offer
and Source of Funds."
 
     The Shares are listed and principally traded on the New York Stock
Exchange, Inc. (the "NYSE"). On August 23, 1994, the last full day of trading
prior to the announcement of the Offer, the closing sales price of the Shares on
the NYSE as reported on the Composite Tape was $53 1/8 per Share. Stockholders
are urged to obtain a current market quotation for the Shares.
 
              THE OFFER IS NOT CONDITIONED UPON ANY MINIMUM NUMBER
                           OF SHARES BEING TENDERED.
 
                                   IMPORTANT
 
     Any stockholder desiring to accept the Offer should either (1) request his
or her broker, dealer, commercial bank, trust company or nominee to effect the
transaction for him or her or (2) complete the Letter of Transmittal or a
facsimile thereof, sign it in the place required, have his or her signature
thereon guaranteed if required by the Letter of Transmittal and forward it and
any other required documents to The First National Bank of Boston (the
"Depositary"), and either deliver the certificates for the Shares being tendered
to the Depositary along with the Letter of Transmittal or tender such Shares
pursuant to the procedure for book-entry transfer set forth in Section 3 hereof.
Stockholders having Shares registered in the name of a broker, dealer,
commercial bank, trust company or other nominee must contact such person if they
desire to tender their Shares. Participants in the Millipore Corporation
Employees' Participation and Savings Plan and vested stock option holders must
review the separate materials enclosed herewith for instructions if they desire
to tender Shares in such plan or subject to such options. Stockholders who wish
to tender Shares and whose certificates for such Shares are not immediately
available should tender such Shares by following the procedures for guaranteed
delivery set forth in Section 3 hereof. Stockholders must complete the section
of the Letter of Transmittal relating to the price at which they are tendering
Shares in order to validly tender Shares.
 
     Questions and requests for assistance or for additional copies of this
Offer to Purchase, the Letter of Transmittal and Notice of Guaranteed Delivery
may be directed to D.F. King & Co., Inc. (the "Information Agent") or J.P.
Morgan Securities Inc. (the "Dealer Manager") at their respective addresses and
telephone numbers set forth on the back cover of this Offer to Purchase.
 
     NEITHER THE COMPANY NOR ITS BOARD OF DIRECTORS MAKES ANY RECOMMENDATION TO
ANY STOCKHOLDER WHETHER TO TENDER ALL OR ANY SHARES. THE COMPANY HAS BEEN
INFORMED THAT NO DIRECTOR OR EXECUTIVE OFFICER OF THE COMPANY INTENDS TO TENDER
ANY SHARES PURSUANT TO THE OFFER. EACH STOCKHOLDER MUST MAKE HIS OR HER OWN
DECISION WHETHER TO TENDER SHARES AND, IF SO, HOW MANY SHARES TO TENDER AND AT
WHAT PRICE.
                            ------------------------
                      The Dealer Manager for the Offer is:
                          J.P. MORGAN SECURITIES INC.
 
August 25, 1994
<PAGE>   2
 
     NO PERSON HAS BEEN AUTHORIZED TO MAKE ANY RECOMMENDATION ON BEHALF OF THE
COMPANY AS TO WHETHER STOCKHOLDERS SHOULD TENDER SHARES PURSUANT TO THE OFFER.
NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THE OFFER OTHER THAN THOSE CONTAINED HEREIN
OR IN THE LETTER OF TRANSMITTAL. IF GIVEN OR MADE, SUCH RECOMMENDATION AND SUCH
INFORMATION AND REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY.
 
<TABLE>
                               TABLE OF CONTENTS
 
<CAPTION>
                                                                             PAGE
                                                                             -----
<S>                                                                           <C>
              BACKGROUND, PURPOSE OF THE OFFER AND SOURCE OF FUNDS

Background................................................................     2
Purpose of the Offer and Source of Funds..................................     2

                                   THE OFFER

  1.   Number of Shares; Proration; Extension of Offer....................     2
  2.   Tenders by Holders of Fewer Than 100 Shares........................     4
  3.   Procedure for Tendering Shares.....................................     4
  4.   Withdrawal Rights..................................................     7
  5.   Acceptance for Payment of Shares and Payment of Purchase Price.....     8
  6.   Certain Conditions of the Offer....................................     8
  7.   Price Range of Shares; Dividends...................................    10
  8.   Certain Effects of the Offer.......................................    10
  9.   Source and Amount of Funds.........................................    11
 10.   Certain Information Concerning the Company.........................    11
 11.   Transactions and Agreements Concerning the Shares..................    16
 12.   Regulatory Approvals...............................................    16
 13.   Certain Federal Income Tax Consequences............................    16
 14.   Extension of Tender Period; Termination; Amendments................    18
 15.   Fees...............................................................    19
 16.   Miscellaneous......................................................    19

Schedule A -- Certain Transactions Involving the Shares...................    20
</TABLE>
 
                                        i
<PAGE>   3
 
To the Holders of Common Stock of
  MILLIPORE CORPORATION:
 
     Millipore Corporation, a Massachusetts corporation (the "Company"), invites
its stockholders to tender shares of its Common Stock, $1.00 par value per share
(such shares, together with all other outstanding shares of Common Stock of the
Company including the associated stock purchase rights (the "Rights") issued
pursuant to the Shareholder Rights Agreement dated as of April 15, 1988 between
the Company and The First National Bank of Boston, as Rights Agent, are herein
referred to as the "Shares"), at prices not greater than $60.00 nor less than
$52.00 per Share, net to the seller in cash, specified by such stockholders,
upon the terms and subject to the conditions set forth herein and in the related
Letter of Transmittal (which together constitute the "Offer").
 
     The Company will determine a single per Share price (not greater than
$60.00 nor less than $52.00 per Share) that it will pay for the Shares validly
tendered pursuant to the Offer (the "Purchase Price"), taking into account the
number of Shares so tendered and the prices specified by tendering stockholders.
The Company will select the Purchase Price that will allow it to purchase
3,500,000 Shares (or such lesser number as are validly tendered at prices not
greater than $60.00 nor less than $52.00 per Share) pursuant to the Offer. No
separate consideration will be paid for the Rights. Each stockholder who has
properly tendered and not withdrawn Shares at or below the Purchase Price will
receive the Purchase Price, net to the stockholder in cash, with respect to all
Shares purchased, upon the terms and subject to the conditions of the Offer,
including the provisions relating to proration and "odd lot" tenders described
below. If, prior to the Expiration Date (as defined in Section 1), more than
3,500,000 Shares (or such greater number of Shares as the Company may elect to
purchase) are properly tendered and not withdrawn, the Company will, upon the
terms and subject to the conditions of the Offer, accept Shares for purchase
first from "odd lot" holders (as described in Section 2) who properly tender
their Shares at or below the Purchase Price and then on a pro rata basis from
other stockholders whose Shares are properly tendered at or below the Purchase
Price and not withdrawn. Shares tendered at prices in excess of the Purchase
Price and Shares not purchased because of proration will be returned.
 
     Tendering stockholders will not be obligated to pay brokerage commissions,
solicitation fees or, subject to the Instructions to the Letter of Transmittal,
stock transfer taxes on the purchase of Shares by the Company. The Company will
pay all charges and expenses of the Dealer Manager, the Depositary and the
Information Agent incurred in connection with the Offer.
 
     THE OFFER IS NOT CONDITIONED UPON ANY MINIMUM NUMBER OF SHARES BEING
TENDERED. THE OFFER IS CONDITIONED UPON THE OCCURRENCE OR NON-OCCURRENCE OF
CERTAIN OTHER EVENTS. SEE SECTION 6. NEITHER THE COMPANY NOR ITS BOARD OF
DIRECTORS MAKES ANY RECOMMENDATION TO ANY STOCKHOLDER WHETHER TO TENDER ALL OR
ANY SHARES. THE COMPANY HAS BEEN INFORMED THAT NO DIRECTOR OR EXECUTIVE OFFICER
OF THE COMPANY INTENDS TO TENDER ANY SHARES PURSUANT TO THE OFFER. EACH
STOCKHOLDER MUST MAKE HIS OR HER OWN DECISION WHETHER TO TENDER SHARES AND, IF
SO, HOW MANY SHARES TO TENDER AND AT WHAT PRICE.
 
     Stockholders who are participants in the Millipore Corporation Employees'
Participation and Savings Plan (the "Savings Plus Plan") may instruct the
trustees identified in the "Letter from Savings Plus Plan Trustees", to tender
part or all of the Shares attributed to the participant's account and in such
case must specify the price or prices at which such Shares are to be tendered.
In addition, holders of vested but unexercised options in the Millipore 1985
Combined Stock Option Plan (the "Option Plan", together with the Savings Plus
Plan, the "Employee Plans") may conditionally exercise such options and instruct
the Company's treasury department as their agent to tender part or all of the
Shares attributed to the optionholder's account ("Option Shares") and in such
case the holders of such options must also specify the price or prices at which
such Option Shares are to be tendered. The Company will, as an accommodation to
option holders planning to tender Option Shares in the Offer, permit a
"cashless" exercise of such options, in
 
                                        1
<PAGE>   4
 
which case the consideration received by option holders that have validly
tendered their Option Shares will be the difference between the Purchase Price
and the exercise price relating to the Option Shares so tendered.
 
     As of August 24, 1994, the Company had issued and outstanding 28,173,782
Shares. In addition, as of such date an aggregate of approximately 1,321,000
Shares were issuable upon exercise of stock options. The 3,500,000 Shares that
the Company is offering to purchase represent approximately 12.4 percent of the
Shares then outstanding. The Shares are listed and principally traded on the New
York Stock Exchange, Inc. (the "NYSE"). On August 23, 1994, the last full day of
trading prior to announcement of the Offer, the closing sales price of the
Shares on the NYSE as reported on the Composite Tape was $53 1/8 per Share. See
Section 7. Stockholders are urged to obtain a current market quotation for the
Shares.
 
              BACKGROUND, PURPOSE OF THE OFFER AND SOURCE OF FUNDS
 
BACKGROUND
 
     The Company is making the Offer as part of a change in strategic direction
aimed at refocusing the Company's business on membrane purification technologies
where the outlook for profitability and growth appears most promising in order
to improve operating performance and increase shareholder value. In November
1993 the Company announced that it had approved a plan to focus the Company on
its membrane business, divest its Waters Chromatography Business and explore
options for exiting its non-membrane bioscience business (the "Biosearch
Division"). On August 18, 1994, the Company completed the sale of its Waters
Chromatography Business and on August 22, 1994 completed the sale of the
Biosearch Division. As a result of the consummation of these two divestitures,
the Company expects to realize an after-tax gain of approximately $10,000,000.
With the disposition of these two business units the Company is now positioned
to focus all efforts on its membrane purification activities. This action, if
successful, combined with the reduction in the number of outstanding shares,
should result in a substantial increase in the Company's net income per share.
Of course, there can be no assurance as to the level of future earnings
generated by the Company's businesses.
 
PURPOSE OF THE OFFER AND SOURCE OF FUNDS
 
     The purpose of the Offer is to allow those stockholders desiring to receive
cash for a portion, or possibly for all, of their Shares an opportunity to do so
at a price in excess of the average trading price for the ten day period
immediately prior to the announcement of the Offer. The Board of Directors
believes that the Shares represent an attractive investment for the Company and
its continuing stockholders.
 
     A portion of the net proceeds from the sale of the Waters Chromatography
Business and the Biosearch Division will be used to purchase Shares in the
Offer. The Company presently intends that the balance of the proceeds from these
sales will be directed to repurchase the Company's Shares in open-market or
negotiated transactions pursuant to a Board-authorized open market share
repurchase program anticipated to take place following the conclusion of the
Offer. Any future purchases of Shares by the Company would depend on many
factors, including the market price of the Shares, the Company's business and
financial position, and general economic and market conditions. See Sections 8
and 9.
 
                                   THE OFFER
 
     1. NUMBER OF SHARES; PRORATION; EXTENSION OF OFFER.  Upon the terms and
subject to the conditions described herein and in the Letter of Transmittal, the
Company will purchase up to 3,500,000 Shares that are validly tendered and not
withdrawn prior to the Expiration Date at a price (determined in the manner set
forth below) not greater than $60.00 nor less than $52.00 per Share. The later
of 12:00 midnight, New York City time, on September 22, 1994, or the latest time
and date to which the Offer is extended, is referred to herein as the
"Expiration Date". For a description of the Company's right to extend the period
of time during which the offer is open or to delay, terminate or amend the
offer, see Section 14. Only Shares validly tendered prior to
 
                                        2
<PAGE>   5
 
the Expiration Date will be eligible for purchase. If the Offer is
oversubscribed as described below, only Shares validly tendered at or below the
Purchase Price prior to the Expiration Date will be eligible for proration.
 
     The Company will determine the Purchase Price taking into account the
number of Shares so tendered and the prices specified by tendering stockholders.
The Company will select the Purchase Price that will allow it to purchase
3,500,000 Shares (or such lesser number as are validly tendered at prices not
greater than $60.00 nor less than $52.00 per Share) pursuant to the Offer. The
Company reserves the right, in its sole discretion, to purchase up to an
additional 2% of the outstanding Shares pursuant to the Offer, but does not
currently plan to do so.
 
     In accordance with Instruction 5 of the Letter of Transmittal, each
stockholder who wishes to tender Shares must specify the price (not greater than
$60.00 nor less than $52.00 per Share) at which such stockholder is willing to
have the Company purchase such Shares. As promptly as practicable following the
Expiration Date, the Company will determine the Purchase Price (not greater than
$60.00 nor less than $52.00 per Share) that it will pay for Shares validly
tendered pursuant to the Offer, taking into account the number of Shares so
tendered and the prices specified by tendering stockholders. All Shares
purchased pursuant to the Offer will be purchased at the Purchase Price. All
Shares not purchased pursuant to the Offer, including Shares tendered at prices
greater than the Purchase Price and Shares not purchased because of proration,
will be returned to the tendering stockholders at the Company's expense as
promptly as practicable following the Expiration Date.
 
     Upon the terms and subject to the conditions of the Offer, if 3,500,000 or
fewer Shares have been validly tendered at or below the Purchase Price and not
withdrawn prior to the Expiration Date, the Company will purchase all such
Shares. Upon the terms and subject to the conditions of the Offer, if more than
3,500,000 Shares have been validly tendered at or below the Purchase Price and
not withdrawn prior to the Expiration Date, the Company will purchase Shares in
the following order of priority:
 
          (a) all Shares tendered at or below the Purchase Price and not
     withdrawn prior to the Expiration Date by any stockholder who owned
     beneficially an aggregate of fewer than 100 Shares as of the close of
     business on August 24, 1994 and who validly tenders all of such Shares
     (partial tenders will not qualify for this preference) and completes the
     box captioned "Odd Lots" on the Letter of Transmittal and, if applicable,
     on the Notice of Guaranteed Delivery (see Section 2); and
 
          (b) after purchase of all of the foregoing Shares, all other Shares
     validly tendered at or below the Purchase Price and not withdrawn prior to
     the Expiration Date on a pro rata basis, if necessary (with appropriate
     adjustments to avoid purchases of fractional Shares).
 
     The Company does not expect that it will be able to announce the final
proration factor or to commence payment for any Shares purchased pursuant to the
Offer until approximately seven NYSE trading days after the Expiration Date if
proration of tendered Shares is required because of the difficulty in
determining the number of Shares validly tendered (including Shares tendered
pursuant to the guaranteed delivery procedure described in Section 3) and not
withdrawn prior to the Expiration Date and as a result of the "odd lot"
procedure described in Section 2. Preliminary results of proration will be
announced by press release as promptly as practicable after the Expiration Date.
Holders of Shares may obtain such preliminary information from the Dealer
Manager or the Information Agent and may also be able to obtain such information
from their brokers.
 
     The Company expressly reserves the right, in its sole discretion, at any
time or from time to time, to extend the period of time during which the Offer
is open by giving oral or written notice of such extension to the Depositary.
See Section 14. There can be no assurance, however, that the Company will
exercise its right to extend the Offer. If the Company decides, in its sole
discretion, to increase (except for any increase not in excess of 2% of the
outstanding Shares) or decrease the number of Shares being sought or to increase
or decrease the consideration offered in the Offer to holders of Shares and, at
the time that notice of such increase or decrease is first published, sent or
given to holders of Shares in the manner specified below, the Offer is scheduled
to expire at any time earlier than the tenth business day from the date that
such notice is first so published, sent or given, the Offer will be extended
until the expiration of such ten-business-day period.
 
                                        3
<PAGE>   6
 
For purposes of the Offer, a "business day" means any day other than a Saturday,
Sunday or federal holiday and consists of a time period from 12:01 a.m. through
12:00 midnight, New York City time.
 
     On April 15, 1988, the Board of Directors of the Company declared a
dividend of one Right for each outstanding Share to holders of record at the
close of business on April 27, 1988. Each Right entitles the registered holder
thereof to purchase from the Company, under certain circumstances, an additional
share of the Company's Common Stock at an initial exercise price of $160.00. The
Rights will be exercisable only if a person or group of affiliated or associated
persons acquires beneficial ownership of 20% or more of the outstanding shares
of the Company's Common Stock or commences a tender or exchange offer that would
result in a person or group owning 20% or more of the outstanding Common Stock.
The Rights will expire on April 27, 1998, unless redeemed earlier by the
Company. The Rights are not currently exercisable and trade together with the
Shares associated therewith. The Rights will not become exercisable or
separately tradeable as a result of the Offer. Absent circumstances causing the
Rights to become exercisable or separately tradeable prior to the Expiration
Date, the tender of any Shares pursuant to the Offer will include the tender of
the associated Rights. No separate consideration will be paid for such Rights.
Upon the purchase of Shares by the Company pursuant to the Offer, the sellers of
the Shares so purchased will no longer own the Rights associated with such
Shares.
 
     2. TENDERS BY HOLDERS OF FEWER THAN 100 SHARES.  All Shares validly
tendered at or below the Purchase Price and not withdrawn by or on behalf of
persons who beneficially owned an aggregate of fewer than 100 Shares on August
24, 1994 ("Odd Lot Stockholders"), and who validly tender all such Shares at or
below the Purchase Price and do not withdraw any of such Shares by the
Expiration Date, will be accepted before proration, if any, of the purchase of
other tendered Shares. See Section 1. Partial tenders will not qualify for this
preference, and it is not available to beneficial holders of 100 or more Shares,
even if such holders have separate stock certificates for fewer than 100 Shares.
By accepting the Offer, an Odd Lot Stockholder owning beneficially fewer than
100 Shares will avoid the payment of brokerage commissions and any applicable
odd lot discount payable on a sale of Shares in a transaction effected on a
securities exchange.
 
     As of August 24, 1994 (disregarding Shares held in any of the Company's
benefit and employee stock plans), there were approximately 3,800 holders of
record of Shares, of which approximately 2,150 record holders, holding in the
aggregate approximately 110,000 Shares, held fewer than 100 Shares. Because of
the large number of Shares held in the names of brokers and nominees or in
so-called "street name", the Company is unable to estimate the number of
beneficial owners of fewer than 100 Shares or the aggregate number of Shares
they own. Any Odd Lot Stockholder wishing to tender all of his or her Shares
pursuant to this Section should complete the box captioned "Odd Lots" on the
Letter of Transmittal and, if applicable, on the Notice of Guaranteed Delivery.
 
3. PROCEDURE FOR TENDERING SHARES.
 
     Proper Tender of Shares.  To tender Shares pursuant to the Offer, either
(a) a properly completed and duly executed Letter of Transmittal (or facsimile
thereof) and any other documents required by the Letter of Transmittal must be
received by the Depositary at one of its addresses set forth on the back cover
of this Offer to Purchase or (b) the guaranteed delivery procedure described
below must be complied with. If Shares are tendered using the procedure
described in clause (a) of the preceding sentence, then either (i) certificates
for the Shares to be tendered must be received by the Depositary at one of such
addresses or (ii) such Shares must be delivered pursuant to the procedures for
book-entry transfer described below (and a confirmation of such delivery
received by the Depositary), in each case by the Expiration Date.
 
     In accordance with Instruction 5 of the Letter of Transmittal, in order to
tender Shares pursuant to the Offer, a stockholder must indicate in the section
captioned "Price (In Dollars) Per Share At Which Shares Are Being Tendered" on
the Letter of Transmittal the price (in multiples of $0.125) at which such
Shares are being tendered. Stockholders wishing to tender Shares at more than
one price must complete separate Letters of Transmittal for each price at which
such Shares are being tendered; the same Shares cannot be tendered at more than
one price. For a tender of Shares to be valid, a price box, but only one price
box, on each Letter of Transmittal must be checked. Stockholders wishing to
maximize the possibility that their Shares will be purchased at the relevant
Purchase Price may check the box on the Letter of Transmittal marked "Shares
 
                                        4
<PAGE>   7
 
Tendered At Purchase Price Determined by Dutch Auction". Checking this box may
result in a purchase price of the Shares so tendered at the minimum price of
$52.00.
 
     Notwithstanding any other provisions hereof, payment for Shares tendered
and accepted for payment pursuant to the Offer will be made only after timely
receipt by the Depositary of certificates for such Shares (or a timely
confirmation of a book-entry transfer of such Shares into the Depositary's
account at one of the Book-Entry Transfer Facilities, as defined below), a
properly completed and duly executed Letter of Transmittal (or facsimile
thereof) with any required signature guarantees or on Agent's Message (as
defined below) in connection with a book-entry transfer and any other documents
required by the Letter of Transmittal.
 
     Book Entry Delivery.  The Depositary will establish accounts with respect
to the Shares at The Depository Trust Company, Midwest Securities Trust Company
and Philadelphia Depository Trust Company (collectively referred to as the
"Book-Entry Transfer Facilities") for purposes of the Offer within two business
days after the date of this Offer to Purchase, and any financial institution
that is a participant in the system of any Book-Entry Transfer Facility may make
delivery of Shares by causing such Book-Entry Transfer Facility to transfer such
Shares into the Depositary's account in accordance with the procedures of such
Book-Entry Transfer Facility. Although delivery of Shares may be effected
through book-entry transfer, a properly completed and duly executed Letter of
Transmittal (or facsimile thereof) or on Agent's Message in connection with a
book-entry transfer and any other required documents must, in any case, be
received by the Depositary at one of its addresses set forth on the back cover
of this Offer to Purchase by the Expiration Date, or the guaranteed delivery
procedure described below must be complied with. Delivery of the Letter of
Transmittal and any other required documents to a Book-Entry Transfer Facility
does not constitute delivery to the Depositary. The term "Agent's Message" means
a message, transmitted by a Book-Entry Transfer Facility to, and received by,
the Depositary and forming a part of a Book-Entry Confirmation, which states
that such Book-Entry Transfer Facility has received an express acknowledgement
from the participant in such Book-Entry Transfer Facility tendering the Shares
which are the subject of such Book-Entry Confirmation, that such participant has
received and agrees to be bound by the terms of the Letter of Transmittal and
that the Company may enforce such agreement against such participant.
 
     Method of Delivery.  The method of delivery of all documents, including
Share certificates, is at the election and risk of the tendering stockholder. If
delivery is by mail, registered mail with return receipt requested, properly
insured, is recommended.
 
     Signature Guarantees.  Except as otherwise provided below, all signatures
on a Letter of Transmittal must be guaranteed by a financial institution
(including most banks, savings and loans associations and brokerage houses)
which is a participant in the Securities Transfer Medallion Program, the New
York Stock Exchange Medallion Signature Program, or the Stock Exchanges
Medallion Program (an "Eligible Institution"). Signatures on a Letter of
Transmittal need not be guaranteed if (a) the Letter of Transmittal is signed by
the registered holder of the Shares tendered therewith and such holder has not
completed either the box entitled "Special Payment Instructions" or the box
entitled "Special Delivery Instructions" on the Letter of Transmittal or (b)
such Shares are tendered for the account of an Eligible Institution. See
Instructions 1 and 7 of the Letter of Transmittal.
 
     Guaranteed Delivery.  If a stockholder desires to tender Shares pursuant to
the Offer and cannot deliver such Shares and all other required documents to the
Depositary by the Expiration Date, such Shares may nevertheless be tendered if
all of the following conditions are met:
 
          (i) such tender is made by or through an Eligible Institution;
 
          (ii) a properly completed and duly executed Notice of Guaranteed
     Delivery substantially in the form provided by the Company is received by
     the Depositary (as provided below) by the Expiration Date; and
 
          (iii) the certificates for such Shares (or a confirmation of a
     book-entry transfer of such Shares into the Depositary's account at one of
     the Book-Entry Transfer Facilities), together with a properly completed and
     duly executed Letter of Transmittal (or facsimile thereof) or, in the case
     of a book-entry
 
                                        5
<PAGE>   8
 
     transfer, an Agent's Message and any other documents required by the Letter
     of Transmittal, are received by the Depositary within five NYSE trading
     days after the date of execution of the Notice of Guaranteed Delivery.
 
     The Notice of Guaranteed Delivery may be delivered by hand or transmitted
by telegram, facsimile transmission or mail to the Depositary and must include a
guarantee by an Eligible Institution in the form set forth in such Notice.
 
     Employee Plans.  Participants in the Savings Plus Plan who wish to have the
Trustees of such Plan tender Shares attributable to their accounts should so
indicate by completing, executing and returning to such trustees the election
form included in the notice sent to such participants. Holders of vested but
unexercised options may exercise their options and instruct the Company's
Treasury Department to tender the Shares to be received at the prices they
designate. Such holders may also exercise vested but unexercised options for
cash in accordance with the terms of the Option Plan and tender the Shares
received in accordance with the Offer. See "Proper Tender of Shares" above. The
participants in the Employee Plans (other than option holders who have exercised
their options for cash and received Shares) may not use the Letter of
Transmittal to direct the tender of the Shares, but must use the separate
election form sent to them. Employee Plan participants are urged to read the
separate election form and related materials carefully. See Instruction 13 of
the Letter of Transmittal.
 
     Federal Income Tax Withholding.  Under federal income tax backup
withholding rules, 31% of the gross proceeds payable to a stockholder or other
payee pursuant to the Offer must be withheld and remitted to the United States
Treasury, unless the stockholder or other payee provides his or her taxpayer
identification number (employer identification number or social security number)
to the Depositary and certifies that such number is correct, or unless an
exemption applies. Certain stockholders (including, among others, all
corporations and certain non-resident alien individuals) are not subject to
these backup withholding and reporting requirements ("exempt recipients").
 
     All stockholders other than exempt recipients should execute and return to
the Depositary the Substitute Form W-9 included as part of the Letter of
Transmittal. In order for a foreign individual to qualify as an exempt
recipient, that stockholder must submit a statement, signed under penalties of
perjury, attesting to that individual's exempt status. Such statements may be
obtained from the Depositary. See Instruction 10 of the Letter of Transmittal.
 
     Except to the extent that payments made to noncorporate shareholders
pursuant to the Offer qualify for partial liquidation treatment, as described in
Section 13 below, the Company will treat the gross proceeds payable pursuant to
the Offer as a dividend for United States federal income tax withholding
purposes, and a foreign stockholder (or his or her agent) will therefore be
subject to dividend withholding of federal income tax at a rate of 30%, unless
the Company determines that a reduced rate of withholding is applicable pursuant
to a tax treaty or that an exemption from withholding is applicable because such
gross proceeds are effectively connected with the conduct of a trade or business
within the United States. For this purpose, a foreign stockholder is any
stockholder that is not (i) a citizen or resident of the United States, (ii) a
corporation, partnership or other entity created or organized in or under the
laws of the United States or any political subdivision thereunder or (iii) an
estate or trust the income of which is includable in gross income for United
States federal income tax purposes, regardless of its source. The Company will
determine the applicable rate of withholding by reference to a stockholder's
address, unless the facts and circumstances indicate such reliance is not
warranted or if applicable law (for example, an applicable tax treaty or
Treasury regulations thereunder) requires some other method for determining a
stockholder's residence. A foreign stockholder may be eligible to file for a
refund of such tax or a portion of such tax if the proceeds payable pursuant to
the Offer are entitled to sale or exchange treatment as described in Section 13
below, or if such stockholder is entitled to a reduced rate of withholding
pursuant to a tax treaty and the Company withheld at a higher rate. In order to
claim an exemption from withholding on the grounds that gross proceeds paid
pursuant to the Offer are effectively connected with the conduct of a trade or
business within the United States, a foreign stockholder must deliver to the
Depositary a property executed statement claiming such exemption. Such
statements can be obtained from the Depositary. See Instruction 10 of the Letter
of Transmittal. Foreign stockholders are
 
                                        6
<PAGE>   9
 
urged to consult their own tax advisors regarding the application of federal
income tax withholding, including eligibility for a withholding tax reduction or
exemption and the refund procedure.
 
     ANY TENDERING STOCKHOLDER OR OTHER PAYEE WHO FAILS TO COMPLETE FULLY AND
SIGN THE SUBSTITUTE FORM W-9 INCLUDED IN THE LETTER OF TRANSMITTAL MAY BE
SUBJECT TO REQUIRED FEDERAL INCOME TAX WITHHOLDING OF 31% OF THE GROSS PROCEEDS
PAID TO SUCH SHAREHOLDER OR OTHER PAYEE PURSUANT TO THE OFFER. SEE SECTION 13.
 
     Tender Constitutes An Agreement.  The tender of Shares pursuant to any one
of the procedures described above will constitute the tendering stockholder's
acceptance of the terms and conditions of the Offer and an agreement between the
tendering stockholder and the Company upon the terms and subject to the
conditions of the Offer, including the tendering stockholder's representation
and warranty that (i) such stockholder owns the Shares being tendered within the
meaning of Rule 13e-4 under the Exchange Act, and (ii) the tender of such Shares
complies with Rule 13e-4.
 
     It is a violation of Rule 14e-4 under the Exchange Act for a person,
directly or indirectly, to guarantee tender of Shares for his own account or the
account of another person unless the person so tendering (i) has a net long
position equal to or greater than the number of (x) Shares tendered or (y) other
securities immediately convertible into, or exercisable or exchangeable for, the
number of Shares tendered and will acquire such Shares for tender by conversion,
exercise or exchange of such other securities and (ii) will cause such Shares to
be delivered in accordance with the terms of the Offer. The tender of Shares
pursuant to any one of the procedures described above will constitute the
tendering stockholder's representation and warranty that (i) such stockholder
has a net long position in the Shares being tendered within the meaning of Rule
14e-4 under the Exchange Act and (ii) the tender of such Shares complies with
Rule 14e-4.
 
     Determination of Validity; Rejection of Shares; Waiver of Defects; No
Obligation to Give Notice of Defects.  All questions as to the Purchase Price,
the number of Shares accepted, the form of documents and the validity,
eligibility (including time of receipt) and acceptance for payment of any tender
of Shares will be determined by the Company in its sole discretion, which
determination shall be final and binding on all parties. The Company reserves
the absolute right to reject any or all tenders of Shares determined by it not
to be in proper form, or the acceptance of which or payment for which may, in
the opinion of the Company's counsel, be unlawful. The Company also reserves the
absolute right to waive any defect or irregularity in any tender of particular
Shares, and the Company's interpretation of the terms of the Offer (including
the instructions in the Letter of Transmittal) will be final and binding on all
parties. No tender of Shares will be deemed to be properly made until all
defects and irregularities have been cured or waived. Unless waived, any defects
or irregularities in connection with tenders must be cured within such time as
the Company shall determine. None of the Company, the Dealer Manager, the
Depositary, the Information Agent or any other person will be under any duty to
give notification of any defect or irregularity in tenders or incur any
liability for failure to give any such notification.
 
     4. WITHDRAWAL RIGHTS.  Tenders of Shares made pursuant to the Offer may be
withdrawn at any time prior to the Expiration Date. Thereafter, such tenders are
irrevocable, except that they may be withdrawn after October 20, 1994 (or such
later date if the Offer is extended for an additional period of time) unless
theretofore accepted for payment as provided in this Offer to Purchase. If the
Company extends the period of time during which the Offer is open, is delayed in
accepting for payment or paying for Shares or is unable to accept for payment or
pay for Shares pursuant to the Offer for any reason, then, without prejudice to
the Company's rights under the Offer, the Depositary may, on behalf of the
Company, retain all Shares tendered, and such Shares may not be withdrawn except
as otherwise provided in this Section 4, subject to Rule 13e-4(f)(5) under the
Exchange Act, which provides that the issuer making the tender offer shall
either pay the consideration offered, or return the tendered securities,
promptly after the termination or withdrawal of the tender offer.
 
     To be effective, a written, telegraphic or facsimile transmission notice of
withdrawal must be timely received by the Depositary at one of its addresses set
forth on the back cover of this Offer to Purchase and must specify the name of
the person who tendered the Shares to be withdrawn and the number of Shares to
be
 
                                        7
<PAGE>   10
 
withdrawn. If the Shares to be withdrawn have been delivered to the Depositary,
a signed notice of withdrawal with signatures guaranteed by an Eligible
Institution (except in the case of Shares tendered by an Eligible Institution)
must be submitted prior to the release of such Shares. In addition, such notice
must specify, in the case of Shares tendered by delivery of certificates, the
name of the registered holder (if different from that of the tendering
stockholder) and the serial numbers shown on the particular certificates
evidencing the Shares to be withdrawn or, in the case of Shares tendered by
book-entry transfer, the name and number of the account at one of the Book-Entry
Transfer Facilities to be credited with the withdrawn Shares. Withdrawals may
not be rescinded and Shares withdrawn will thereafter be deemed not validly
tendered for purposes of the Offer. However, withdrawn Shares may be retendered
by again following one of the procedures described in Section 3 at any time
prior to the Expiration Date.
 
     All questions as to the form and validity (including time of receipt) of
any notice of withdrawal will be determined by the Company, in its sole
discretion, which determination shall be final and binding. None of the Company,
the Dealer Manager, the Depositary, the Information Agent or any other person
will be under any duty to give notification of any defect or irregularity in any
notice of withdrawal or incur any liability for failure to give any such
notification.
 
     5. ACCEPTANCE FOR PAYMENT OF SHARES AND PAYMENT OF PURCHASE PRICE.  Upon
the terms and subject to the conditions of the Offer, and as promptly as
practicable after the Expiration Date, the Company will determine the Purchase
Price, taking into account the number of Shares tendered and the prices
specified by tendering stockholders, and will (subject to the proration and "odd
lot" provisions of the Offer) accept for payment (and thereby purchase) and pay
for Shares validly tendered at or below the Purchase Price and not withdrawn as
permitted in Section 4. As soon as practicable following the determination of
the Purchase Price, the Company will announce the Purchase Price it will pay for
tendered Shares. In all cases, payment for Shares accepted for payment pursuant
to the Offer will be made promptly (subject to possible delay in the event of
proration) but only after timely receipt by the Depositary of certificates for
Shares (or of a confirmation of a book-entry transfer of such Shares into the
Depositary's account at one of the Book-Entry Transfer Facilities), a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) and any
other required documents.
 
     For purposes of the Offer, the Company will be deemed to have accepted for
payment (and thereby purchased), subject to the proration and "odd lot"
provisions of the Offer, Shares that are validly tendered and not withdrawn as,
if and when it gives oral or written notice to the Depositary of its acceptance
for payment of such Shares. Payment for Shares accepted for payment pursuant to
the offer will be made by depositing the aggregate Purchase Price with the
Depositary, which will act as agent for tendering stockholders for the purpose
of receiving payment from the Company and transmitting payment to tendering
stockholders. Under no circumstances will interest be paid on amounts to be paid
to tendering stockholders by the Company by reason of any delay in making such
payment.
 
     Certificates for all Shares not purchased will be returned (or, in the case
of Shares tendered by book-entry transfer, such Shares will be credited to an
account maintained with a Book-Entry Transfer Facility) as soon as practicable
without expense to the tendering stockholder. The Company will pay all stock
transfer taxes, if any, payable on the transfer to it of Shares purchased
pursuant to the Offer, except as set forth in Instruction 8 of the Letter of
Transmittal.
 
     Payment for Shares may be delayed in the event of difficulty in determining
the number of Shares validly tendered or if proration is required. See Section
1. In addition, if certain events occur, the Company may not be obligated to
purchase Shares pursuant to the Offer. See Section 6.
 
     As provided in Rules 13e-4(f)(4) and (8)(ii) under the Exchange Act, the
Company will pay, for each Share accepted pursuant to the Offer, the same amount
per Share.
 
     6. CERTAIN CONDITIONS OF THE OFFER.  Notwithstanding any other provision of
the Offer, the Company shall not be required to accept for payment or pay for
any Shares tendered, and may terminate or amend the Offer or may postpone
(subject to the requirements of the Exchange Act for prompt payment for or
return of Shares) the acceptance for payment of, and payment for, Shares
tendered, if prior to the acceptance for
 
                                        8
<PAGE>   11
 
payment of Shares if at any time on or after August 25, 1994 and before
acceptance for payment of or payment for any such Shares any of the following
shall have occurred (or shall have been determined in the sole judgment of the
Company to have occurred) and, in the sole judgment of the Company, in any such
case and regardless of the circumstances (including any action or omission to
act by the Company) giving rise to such condition, such event makes it
inadvisable to proceed with the Offer or with such acceptance for payment or
payment:
 
          (a) there shall have been threatened, instituted or pending any action
     or proceeding by any government or governmental, regulatory or
     administrative agency, authority or tribunal or any other person, domestic
     or foreign, before any court, authority, agency or tribunal which directly
     or indirectly (i) challenges the making of the Offer, the acquisition of
     some or all of the Shares pursuant to the Offer or otherwise relates in any
     manner to the Offer; or (ii) in the Company's sole judgment, could
     materially and adversely affect the business, condition (financial or
     other), income, operations or prospects of the Company and its
     subsidiaries, taken as a whole, or otherwise materially impair in any way
     the contemplated future conduct of the business of the Company or any of
     its subsidiaries or materially impair the contemplated benefits of the
     Offer to the Company.
 
          (b) there shall have been any action threatened, pending or taken, or
     approval withheld, or any statute, rule, regulation, judgment, order or
     injunction threatened, proposed, sought, promulgated, enacted, entered,
     amended, enforced or deemed to be applicable to the Offer or the Company or
     any of its subsidiaries, by any court or any authority, agency or tribunal
     which, in the Company's sole judgment, would or might directly or
     indirectly (i) make the acceptance for payment of, or payment for, some or
     all of the Shares illegal or otherwise restrict or prohibit consummation of
     the Offer; (ii) delay or restrict the ability of the Company, or render the
     Company unable, to accept for payment or pay for some or all of the Shares;
     (iii) materially impair the contemplated benefits of the Offer to the
     Company; or (iv) materially and adversely affect the business, condition
     (financial or other), income, operations or prospects of the Company and
     its subsidiaries, taken as a whole, or otherwise materially impair in any
     way the contemplated future conduct of the business of the Company or any
     of its subsidiaries;
 
          (c) there shall have occurred (i) any general suspension of trading
     in, or limitation on prices for, securities on any national securities
     exchange or in the over-the-counter market; (ii) the declaration of a
     banking moratorium or any suspension of payments in respect of banks in the
     United States; (iii) the commencement of a war, armed hostilities or other
     international or national calamity directly or indirectly involving the
     United States; (iv) any limitation (whether or not mandatory) by any
     governmental, regulatory or administrative agency or authority on, or any
     event which, in the Company's sole judgment, might affect, the extension of
     credit by banks or other lending institutions in the United States; (v) any
     significant decrease in the market price of the Shares or any change in the
     general political, market, economic or financial conditions in the United
     States or abroad that could, in the sole judgment of the Company, have a
     material adverse effect on the Company's business, operations or prospects,
     trading in the Shares or the value of the Company; (vi) in the case of any
     of the foregoing existing at the time of the commencement of the Offer, a
     material acceleration or worsening thereof; or (vii) any decline in either
     the Dow Jones Industrial Average (3775.83 at the close of business on
     August 23, 1994) or the Standard and Poor's Index of 500 Industrial
     Companies (464.51 at the close of business on August 23, 1994) by an amount
     in excess of 10 percent measured from the close of business on August 23,
     1994;
 
          (d) (i) the Company shall have entered into a definitive agreement or
     an agreement in principle with any person with respect to a merger,
     business combination or acquisition proposal, disposition of assets other
     than in the ordinary course of business or (ii) any tender or exchange
     offer with respect to some or all of the Shares (other than this Offer)
     shall have been commenced;
 
          (e) any change shall occur or be threatened in the business, condition
     (financial or other), income, operations, Share ownership or prospects of
     the Company and its subsidiaries, taken as a whole, which, in the sole
     judgment of the Company, is or may be material to the Company or its
     subsidiaries; or
 
                                        9
<PAGE>   12
 
          (f) (i) any person, entity or "group" (as that term is used in Section
     13(d)(3) of the Exchange Act) shall have acquired, or proposed to acquire,
     beneficial ownership of more than 5% of the outstanding Shares (other than
     a person, entity or group which had publicly disclosed such ownership in a
     Schedule 13D or 13G (or an amendment thereto) on file with the Securities
     and Exchange Commission (the "Commission") prior to August 24, 1994); (ii)
     any person, entity or group which had filed with the Commission on or
     before August 24, 1994 a Schedule 13G or a Schedule 13D with respect to the
     Shares shall have acquired, or proposed to acquire, beneficial ownership of
     additional Shares constituting more than 2% of the outstanding Shares; or
     (iii) any new group shall have been formed which beneficially owns more
     than 5% of the outstanding Shares (options for and other rights to acquire
     Shares which are acquired or proposed to be acquired being deemed for
     purposes of this clause (f) to be immediately exercisable or convertible).
 
     The foregoing conditions are for the sole benefit of the Company and may be
asserted by the Company regardless of the circumstances (including any action or
inaction by the Company) giving rise to any such condition and any such
condition may be waived by the Company, in whole or in part, at any time and
from time to time in its sole discretion. The Company's failure at any time to
exercise any of the foregoing rights shall not be deemed a waiver of any such
right; the waiver of any such right with respect to particular facts and
circumstances shall not be deemed a waiver with respect to any other facts or
circumstances; and each such right shall be deemed an ongoing right which may be
asserted at any time and from time to time. Any determination by the Company
concerning the events described above will be final and binding on all parties.
 
     7. PRICE RANGE OF SHARES; DIVIDENDS.  The Shares are listed and principally
traded on the NYSE. See Section 10. The following table sets forth the high and
low closing prices of the Shares as reported on the Composite Tape, and
dividends paid per Share, for the fiscal periods indicated:
 
<TABLE>
<CAPTION>
                          FISCAL QUARTER                              HIGH     LOW    DIVIDENDS
- -------------------------------------------------------------------  ------   ------  ---------
<S>                                                                  <C>      <C>     <C>
1992:
     Third.........................................................  $34.25   $27.13    $0.13
     Fourth........................................................  $28.00   $30.00    $0.13
1993:
     First.........................................................  $35.50   $25.88    $0.13
     Second........................................................  $32.38   $26.50    $0.14
     Third.........................................................  $34.25   $29.75    $0.14
     Fourth........................................................  $40.25   $32.75    $0.14
1994:
     First.........................................................  $48.88   $38.38    $0.14
     Second........................................................  $53.75   $43.00    $0.15
     Third (through August 23, 1994)...............................  $54.25   $50.00    $0.15
</TABLE>
 
     On August 23, 1994, the last full day of trading prior to the announcement
of the Offer, the closing sales price of the Shares on the NYSE as reported on
the Composite Tape was $53 1/8 per Share. Stockholders are urged to obtain a
current market quotation for the Shares.
 
     8. CERTAIN EFFECTS OF THE OFFER.  As of August 24, 1994, the Company had
issued and outstanding 28,173,782 Shares. The 3,500,000 Shares that the Company
is offering to purchase pursuant to the Offer represent approximately 12.4% of
the Shares outstanding as of that date. The Company does not believe that the
purchase of Shares pursuant to the Offer will result in delisting of the Shares
on the NYSE or termination of registration of the Shares under the Exchange Act.
 
     Over the past several years, the Company has from time to time repurchased
the Company's Shares, with such purchases effected on the open market, in
privately negotiated transactions or otherwise. On April 22, 1994, the Company
announced a resumption of its repurchase program after a period of inactivity,
with the announced goal of repurchasing approximately 1 million shares on the
open market to meet some or all of the short-term demand under its Employee
Stock Purchase Plan. Between April 22, 1994 and August 5, 1994, the Company
purchased a total of 559,300 Shares at prices ranging from a high of $52.78 to a
low of $47.56 per Share. The average price per Share was approximately $51.33.
The Company has not acquired any Shares
 
                                       10
<PAGE>   13
 
under its repurchase program since August 5, 1994. The Company presently intends
to use the balance of the proceeds of the sales of the Waters Chromatography
Business and Biosearch Division to purchase additional shares pursuant to a
Board-authorized open market share repurchase program after the conclusion of
the Offer, such purchases to be effected on the open market, in privately
negotiated transactions or otherwise. Any future purchases of Shares by the
Company would depend on many factors, including the market price of the Shares,
the Company's business and financial position, and general economic and market
conditions. Such future purchases may be on the same terms as, or on terms which
are more or less favorable to stockholders than, the terms of the Offer. Rule
13e-4 under the Exchange Act, however, prohibits the Company and its affiliates
from purchasing any Shares, other than pursuant to the Offer, until the
expiration of at least ten business days from the Expiration Date.
 
     Set forth on Schedule A are transactions in Shares effected by certain
individuals during the 40 business days prior to the date hereof.
 
     The Shares are currently "margin securities" under the rules of the Federal
Reserve Board. This has the effect, among other things, of allowing brokers to
extend credit on the collateral of the Shares. The Company believes that,
following the repurchase of Shares pursuant to the Offer, the Shares will
continue to be margin securities for purposes of the Federal Reserve Board's
margin regulations.
 
     The Company currently intends to maintain the Shares purchased pursuant to
the Offer as treasury shares but may restore all or any portion of such shares
to the status of authorized and unissued shares in the future in its sole
discretion.
 
     Directors and executive officers of the Company currently own beneficially
and of record in the aggregate approximately 1.45% of the outstanding Shares.
Assuming the purchase of 3,500,000 Shares pursuant to the Offer and assuming no
Director or executive officer sells any Shares pursuant to the Offer or
otherwise, Directors and executive officers of the Company would own in the
aggregate approximately 1.66% of the outstanding Shares.
 
     NEITHER THE COMPANY NOR ITS BOARD OF DIRECTORS MAKES ANY RECOMMENDATION TO
ANY STOCKHOLDER AS TO WHETHER TO TENDER ALL OR ANY SHARES. THE COMPANY HAS BEEN
INFORMED THAT NO DIRECTOR OR EXECUTIVE OFFICER OF THE COMPANY INTENDS TO TENDER
ANY SHARES PURSUANT TO THE OFFER. EACH STOCKHOLDER MUST MAKE HIS OR HER OWN
DECISION WHETHER TO TENDER SHARES AND, IF SO, HOW MANY SHARES TO TENDER AND AT
WHAT PRICE.
 
     9. SOURCE AND AMOUNT OF FUNDS.  Assuming that the Company purchases
3,500,000 Shares pursuant to the Offer at a price of $60.00 per Share, the
Company estimates that the total amount required to purchase such Shares and pay
related fees and expenses will be approximately $210 million. The Company
expects to pay for the Shares purchased pursuant to the Offer with a portion of
the net proceeds from the sale of the Waters Chromatography Business and the
Biosearch Division (approximately $300 million). In addition, it is anticipated
that the balance of the proceeds from the sale of these two business units will
be used in a program to repurchase the Company's Shares following expiration of
this Offer and subject to the requirements of the Exchange Act.
 
     10. CERTAIN INFORMATION CONCERNING THE COMPANY.  Millipore Corporation was
incorporated under the laws of The Commonwealth of Massachusetts on May 3, 1954.
Millipore and its subsidiaries operate in a single business segment, the
analysis, identification and purification of fluids using separations
technology. Millipore is a leader in the field of membrane separations
technology. The Company develops, manufactures and sells products which are used
primarily for the analysis and purification of fluids. The Company's products
are based on a variety of membranes and certain other technologies and effect
separations, principally through physical and chemical methods. Millipore is an
integrated multinational manufacturer of these products. Its corporate offices
are located at 80 Ashby Road, Bedford, Massachusetts 01730-2271, telephone (617)
275-9200.
 
     Certain Recent Developments.  On November 11, 1993 the Company announced
that it had approved a plan to focus the Company on its membrane business,
divest its Waters Chromatography Business and explore options for exiting the
Biosearch Division. The Waters Chromatography Business was acquired in 1980.
 
                                       11
<PAGE>   14
 
Growth in the analytical instrument market has been limited in the past few
years and the Company believes that the divestiture of its chromatography
business along with that of its non-membrane bioscience business, will enable
the Company to better serve its membrane customers, improve operating
performance and increase shareholder value. The Company completed the sale of
substantially all of the assets and liabilities of the Waters Chromatography
Business on August 18, 1994 and of the Biosearch Division on August 22, 1994 and
expects to record an after-tax gain on such sales of approximately $10,000,000.
The net proceeds of the sale of these two units will be applied to this Offer
and to a share repurchase program to be commenced after the conclusion of this
Offer as described above. In addition, in late July and early August, the
Company completed the sale of its Ceraflo (ceramic filters) and BioImage (image
analysis systems and software) product lines. The consideration received for the
Ceraflo product line consisted of 135,500 shares of the common stock of U.S.
Filter Corp., valued at $2.6 million; and for the BioImage product line cash in
the amount of $585,000 and a five year promissory note for $800,000.
 
     Summary Historical Consolidated Financial Information.  Set forth below is
certain summary historical consolidated financial information of the Company and
its subsidiaries. The historical financial information (other than the ratios of
earnings to fixed charges) were derived from the audited consolidated financial
statements included in the Company's Annual Report on Form 10-K for the year
ended December 31, 1993 (the "Company's 1993 Annual Report"), and from the
unaudited summary consolidated financial statements included in the Company's
Quarterly Report on Form 10-Q for the period ended June 30, 1994 (the "Company's
1994 Second Quarter Report"), and in the Company's current report on Form 8-K
dated August 24, 1994 each of which are hereby incorporated herein by reference,
and other information and data contained in the Company's 1993 Annual Report and
the Company's 1994 Second Quarter Report. More comprehensive financial
information is included in such reports and the financial information which
follows is qualified in its entirety by reference to such reports and all of the
financial statements and related notes contained therein, copies of which may be
obtained as set forth below under the caption "Additional Information About the
Company".
 
                                       12
<PAGE>   15
<TABLE>
             SUMMARY HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
              (in thousands, except ratios and per share amounts)
 
<CAPTION>
                                                             UNAUDITED
                                                            SIX MONTHS            YEARS ENDED
                                                          ENDED JUNE 30,         DECEMBER 31,
                                                        -------------------   -------------------
                                                          1994       1993       1993       1992
                                                        --------   --------   --------   --------
<S>                                                     <C>        <C>        <C>        <C>
Income Statement Data:
Revenues from continuing operations.................... $243,649   $219,802   $445,366   $427,188
Income from continuing operations before extraordinary
  loss and cumulative effect of accounting change......   32,866     23,245     48,998     35,536
Income (Loss) from discontinued operations (1).........    --        (9,662)   (10,851)     2,715
Extraordinary loss on early extinguishment of debt.....    --         --        (3,544)     --
Cumulative effect of change in accounting principle....    --         --         --        (5,068)
                                                        --------   --------   --------   --------
Net income............................................. $ 32,866   $ 13,583   $ 34,603   $ 33,183
                                                        ========   ========   ========   ========
Earnings per share of common stock:
     Income from continuing operations before
       extraordinary loss and cumulative effect of
       accounting change............................... $   1.16   $   0.83   $   1.75   $   1.26
     Loss from discontinued operations.................    --         (0.34)     (0.38)      0.10
     Extraordinary loss on early extinguishment of
       debt............................................    --         --         (0.13)     --
     Cumulative effect of change in accounting
       principle.......................................    --         --         --         (0.19)
                                                        --------   --------   --------   --------
     NET INCOME........................................ $   1.16   $   0.49   $   1.24   $   1.17
                                                        ========   ========   ========   ========
Average number of common shares outstanding............   28,256     27,964     27,951     28,242
Ratio of earnings from continuing operations to fixed
  charges (2)..........................................    10.75       5.72       6.24       4.69
BALANCE SHEET DATA (AT PERIOD END):
Total Assets........................................... $723,648   $720,000   $702,604   $747,643
Working capital........................................ $278,859   $227,609   $236,674   $223,453
Notes payable and long-term debt....................... $128,159   $202,522   $153,467   $215,304
Shareholders' equity................................... $506,865   $450,000   $461,154   $452,835
Book value per common share............................ $  17.86   $  16.12   $  16.47   $  16.19
</TABLE>
 
         NOTE TO SUMMARY HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
 
     (1) On November 11, 1993, the Company's Board of Directors approved a plan
to divest operations of the Company's Instrumentation Divisions, which serve
primarily chromatography and bioscience markets. Accordingly, the operating
results of these divisions through November 11, 1993 have been classified as
discontinued operations in the historical financial statements. The 1993
operating results of the discontinued operations includes a $13.0 million
restructuring charge associated with the reorganization of the Chromatography
Division. The operating results of the discontinued businesses since November
11, 1993 have been deferred pending finalization of the divestitures. Assets and
liabilities associated with the discontinued businesses have been classified
separately in the Company's historical consolidated balance sheets.
 
     (2) The ratios of earnings from continuing operations to fixed charges were
computed by dividing earnings from continuing operations before fixed charges
and income taxes by the fixed charges. Earnings consist of income from
continuing operations, to which has been added fixed charges and income taxes.
Fixed charges consist of interest and debt expense and one-third of rent
expense, which approximates the interest factor.
 
     (3) Book value per common share is calculated as total shareholder's equity
divided by common shares outstanding at the end of the period.
 
                                       13
<PAGE>   16
     Summary Unaudited Consolidated Pro Forma Financial Information.  The
following summary unaudited consolidated pro forma financial information gives
effect to the purchase of Shares pursuant to the Offer, based on certain
assumptions described in the Notes to Summary Unaudited Consolidated Pro Forma
Financial Information and gives effect to the purchase of Shares pursuant to the
Offer as if it had occurred on January 1, 1994 and January 1, 1993. The summary
unaudited consolidated pro forma financial information should be read in
conjunction with the summary consolidated historical financial information and
does not purport to be indicative of the results that would actually have been
obtained had the purchase of the Shares pursuant to the Offer been completed at
the dates indicated or that may be obtained in the future.
 
<TABLE>
         SUMMARY UNAUDITED CONSOLIDATED PRO FORMA FINANCIAL INFORMATION
              (In thousands, except ratios and per share amounts)
 
<CAPTION>
                                                    SIX MONTHS ENDED JUNE 30, 1994             YEAR ENDED DECEMBER 31, 1993
                                                --------------------------------------    ---------------------------------------
                                                                     PRO FORMA                                  PRO FORMA
                                                             -------------------------                  -------------------------
                                                                             ASSUMED                                    ASSUMED
                                                             ASSUMED $52     $60 PER                    ASSUMED $52     $60 PER
                                                              PER SHARE       SHARE                      PER SHARE       SHARE
                                                UNAUDITED     PURCHASE       PURCHASE                    PURCHASE       PURCHASE
                                                HISTORICAL      PRICE         PRICE       HISTORICAL       PRICE         PRICE
                                                ---------    -----------    ----------    ----------    -----------    ----------
<S>                                             <C>          <C>            <C>           <C>           <C>            <C>
INCOME STATEMENT DATA:
Revenues from continuing operations..........   $243,649      $ 243,649      $243,649      $445,366      $ 445,366      $445,366
Income from continuing operations before
  extraordinary loss.........................     32,866         32,866        32,866        48,998         48,998        48,998
Loss from discontinued operations............      --            --            --           (10,851)        --            --
Extraordinary loss on early extinguishment of
  debt.......................................      --            --            --            (3,544)        (3,544)       (3,544)
                                                ---------    -----------    ----------    ----------    -----------    ----------
NET INCOME...................................   $ 32,866      $  32,866      $ 32,866      $ 34,603      $  45,454      $ 45,454
                                                =========    ============   ==========    =========     ============   ==========
Earnings per share of common stock:
    Income from continuing operations before
      extraordinary loss.....................   $   1.16      $    1.33      $   1.33      $   1.75      $    2.00      $   2.00
    Loss from discontinued operations........      --            --            --             (0.38)        --            --
    Extraordinary loss on early
      extinguishment of debt.................      --            --            --             (0.13)         (0.14)        (0.14)
                                                ---------    -----------    ----------    ----------    -----------    ----------
    Net Income...............................   $   1.16      $    1.33      $   1.33      $   1.24      $    1.86      $   1.86
                                                =========    ============   ==========    =========     ============   ==========
Average number of common shares
  outstanding................................     28,256         24,756        24,756        27,951         24,451        24,451
Ratio of earnings from continuing operations
  to fixed charges...........................      10.75          10.75         10.75          6.24           6.24          6.24
</TABLE>
<TABLE>
<CAPTION>
                                                            JUNE 30, 1994                          AT DECEMBER 31, 1993
                                                --------------------------------------    ---------------------------------------
                                                                     PRO FORMA                                  PRO FORMA
                                                             -------------------------                  -------------------------
                                                                             ASSUMED                                    ASSUMED
                                                             ASSUMED $52     $60 PER                    ASSUMED $52     $60 PER
                                                              PER SHARE       SHARE                      PER SHARE       SHARE
                                                UNAUDITED     PURCHASE       PURCHASE                    PURCHASE       PURCHASE
                                                HISTORICAL      PRICE         PRICE       HISTORICAL       PRICE         PRICE
                                                ---------    -----------    ----------    ----------    -----------    ----------
<S>                                             <C>          <C>            <C>           <C>           <C>            <C>
BALANCE SHEET DATA:
Total assets.................................   $723,648      $ 636,673      $608,673      $702,604      $ 624,370      $596,370
Working Capital..............................    278,859        188,787       160,787       236,674        145,821       117,821
Notes payable and long-term debt.............    128,159        128,159       128,159       153,467        153,467       153,467
Shareholders' equity.........................    506,865        334,365       306,365       461,154        288,654       260,654
Book value per common share..................      17.86          13.44         12.31         16.47          11.78         10.64
</TABLE>
 
    NOTES TO SUMMARY UNAUDITED CONSOLIDATED PRO FORMA FINANCIAL INFORMATION
 
     The following assumptions regarding the Offer were made in determining the
pro forma financial information:
 
          (1) The information assumes 3,500,000 Shares are purchased at $52.00
     per Share and at $60.00 per Share, with the purchase being financed with a
     portion of the cash proceeds from the sale of the Company's Water
     Chromatography Business and Biosearch Division, which sales were assumed to
     have occurred at the beginning of the periods presented. The Company
     received on August 18 and 22, 1994 proceeds of approximately $300 million
     from the sale of its Waters Chromatography Business and its Biosearch
     Division. For purposes of the pro forma financial information, the sales
     were assumed to have
 
                                       14
<PAGE>   17
 
     produced an after-tax gain of $10 million. The gain is reflected as an
     adjustment to shareholder's equity as of the beginning of all periods
     presented.
 
          The information assumes no reinvestment of the excess proceeds over
     the purchase price of the Shares. There can be no assurance that the
     Company will purchase 3,500,000 Shares or as to the price at which Shares
     will be purchased.
 
          (2) Net income has been adjusted by the Company's results of its
     Chromatography and BioSearch Divisions which were previously reported as a
     discontinued operations. See Note 1 to the Summary Historical Consolidated
     Financial Information.
 
          (3) Expenses directly related to the Offer are assumed to be $500,000
     and are charged against additional paid-in capital.
 
          (4) The pro forma financial information assumes that none of the
     1,300,000 Shares exercisable by employees under the Company's stock option
     plan are exercised in the tender offer.
 
          (5) The ratios of earnings from continuing operations to fixed charges
     were computed by dividing earnings from continuing operations before fixed
     charges and income taxes by the fixed charges. Fixed charges consist of
     interest and debt expense and one third of rent expense, which approximates
     the interest factor.
 
          (6) Book value per common share is calculated as total shareholder's
     equity divided by common shares outstanding at the end of the period.
 
                            ------------------------
 
     Plans and Proposals.  The Company has no agreements or understandings as to
either divestitures or acquisitions that would be material to the Company and
does not have any plans or proposals which relate to or would result in: (a) the
acquisition by any person of additional securities of the Company or the
disposition of securities of the Company; (b) an extraordinary corporate
transaction, such as a merger, reorganization or liquidation, involving the
Company or any of its subsidiaries; (c) a sale or transfer of a material amount
of assets of the Company or any of its subsidiaries; (d) any change in the
present Board of Directors or management of the Company; (e) any material change
in the present dividend policy (however, management anticipates that the
Company's dividend policy will be reviewed by the directors later in this year),
indebtedness or capitalization of the Company; (f) any other material change in
the Company's corporate structure or business; (g) any change in the Company's
Restated Articles of Organization or By-Laws or any actions which may impede the
acquisition of control of the Company by any person; (h) a class of equity
security of the Company being terminated from quotation on the NYSE; (i) a class
of equity security of the Company becoming eligible for termination of
registration pursuant to Section 12(g)(4) of the Exchange Act; or (j) the
suspension of the Company's obligation to file reports pursuant to Section 15(d)
of the Exchange Act.
 
     Additional Information About the Company.  The Company's Annual Report on
Form 10-K for the year ended December 31, 1993, its Quarterly Reports on Form
10-Q for the quarters ended March 31 and June 30, 1994, respectively, its
Current Report on Form 8-K dated August 24, 1994 and its Proxy Statement with
respect to its 1994 annual meeting have been filed with the Commission. Copies
of such documents may be obtained from Millipore Corporation, 80 Ashby Road,
Bedford, Massachusetts 01730, telephone (617) 275-9200.
 
     The Company is subject to the informational filing requirements of the
Exchange Act and in accordance therewith is obligated to file reports and other
information with the Commission relating to its business, financial statements
and other matters. Certain information as of particular dates, concerning the
Company's directors and officers, their remuneration, options granted to them,
the principal holders of the Company's securities and any material interest of
such persons in transactions with the Company is filed with the Commission. Such
reports, as well as such other material, may be inspected and copies obtained at
prescribed rates at the Commission's public reference facilities at Room 1024,
450 Fifth Street, N.W., Washington, D.C. 20549; 7 World Trade Center, 13th
Floor, New York, New York 10048; Suite 500 East, Tishman Building, 5757 Wilshire
Boulevard, Los Angeles, California 90036-3648; and 500 West Madison Avenue,
Suite 1400, Chicago, Illinois 60661. The Company has also filed with the
Commission a statement on Schedule 13E-4 that contains additional information
with respect to the Offer. Such Schedule and certain amendments thereto may be
examined and copies may be obtained at the same places and in the same manner as
set forth above (except that such Schedule may not be available in the regional
offices of the Commission).
 
                                       15
<PAGE>   18
 
     11. TRANSACTIONS AND AGREEMENTS CONCERNING THE SHARES.  Except as set forth
in Schedule A hereto, neither the Company nor, to its knowledge, any of the
subsidiaries, executive officers or directors or any associate of any such
officer or director has engaged in any transactions involving the Shares during
the 40 business days preceding the date hereof. Neither the Company nor, to its
knowledge, any of its executive officers or directors is a party to any
contract, arrangement, understanding or relationship relating directly or
indirectly to the Offer with any other person with respect to the Shares.
 
     12. REGULATORY APPROVALS.  The Company is not aware of any approval or
other action by any government or governmental, administrative or regulatory
authority or agency, domestic or foreign, that would be required for the
Company's acquisition or ownership of Shares as contemplated by the Offer or of
any license or regulatory permit that appears to be material to its business
that might be adversely affected by its acquisition of Shares as contemplated in
the Offer. Should any such approval or other action be required, the Company
currently contemplates that it will seek such approval or other action. The
Company cannot predict whether it may determine that it is required to delay the
acceptance of, or payment for, Shares tendered pursuant to the Offer pending the
outcome of any such matter. There can be no assurance that any such approval of
action, if needed, would be obtained or would be obtained without substantial
conditions or that the failure to obtain any such approval or other action might
not result in adverse consequences to the Company's business. The Company's
obligations under the Offer to accept for payment and pay for Shares are subject
to certain conditions. See Section 6.
 
     13. CERTAIN FEDERAL INCOME TAX CONSEQUENCES.  Purchases of Shares by the
Company pursuant to the Offer will generally be taxable transactions for federal
income tax purposes under the United States Internal Revenue Code of 1986, as
amended (the "Code"), and may also be taxable transactions under applicable
state, local and foreign tax laws.
 
     The Company will not seek a ruling from the Internal Revenue Service (the
"IRS") with regard to the federal income tax treatment of the Offer. Moreover,
for reasons discussed below, the IRS has stated that it ordinarily would not
issue a private letter ruling on the partial liquidation treatment of the Offer.
The Company, however, will file information returns with the IRS and
stockholders reporting the gross proceeds paid to stockholders of record
pursuant to the Offer and, as discussed below, will notify stockholders of the
percentage of gross proceeds that, in the view of the Company, may qualify for
partial liquidation treatment for noncorporate stockholders.
 
     The Company cannot predict the extent to which the Offer may be
oversubscribed. If the Offer is oversubscribed, proration of tenders pursuant to
the Offer will cause the Company to accept fewer shares than are tendered.
Therefore, a stockholder can be given no assurance that a sufficient number of
his or her Shares will be purchased pursuant to the Offer to ensure that such
purchase will be treated as a sale or exchange for federal income tax purposes
rather than as a dividend, pursuant to the rules discussed below.
 
     Tax Treatment of Proceeds from Sale.  The sale of Shares pursuant to the
Offer will generally be accorded sale or exchange treatment for federal income
tax purposes and gain or loss (rather than dividend income) will be recognized
by a tendering stockholder if one of the tests described below is satisfied. Any
gain or loss so recognized will be equal to the difference between the amount of
cash received in the exchange and the holder's tax basis in the Shares redeemed.
Provided that the Shares constitute a capital asset in the hands of the selling
stockholder and have a holding period of more than one year, this gain or loss
generally will be long-term capital gain or loss.
 
     If one of the tests described below is not satisfied, gross proceeds
received from the Company for Shares redeemed pursuant to the Offer will be
treated as a fully taxable dividend to the extent of the Company's current or
accumulated earnings and profits. In that event, the tax basis of Shares
purchased by the Company pursuant to the Offer will generally be added to the
tax basis of the Shares that the stockholder continues to own, and such increase
in the Shares' basis may cause any subsequent taxable disposition of retained
Shares to give rise to a loss, which may be a capital loss if such Shares are
held as a capital asset.
 
     Dividend treatment of the gross proceeds received from the Company may be
avoided if the redeeming stockholder either: (i) completely redeems his or her
interest in the Company, (ii) reduces his or her
 
                                       16
<PAGE>   19
 
percentage interest in the Company (as measured before the Company's purchase of
any shares pursuant to the Offer) by more than 20% (as measured after the
Company's purchase of all Shares redeemed pursuant to the Offer) or (iii)
otherwise demonstrates that the disposition of Shares to the Company is "not
essentially equivalent to a dividend". A stockholder's contemporaneous
dispositions or acquisitions of Shares deemed for federal income tax purposes to
be part of an integrated transaction with the Offer may be taken into account in
determining whether the stockholder satisfies any of these tests.
 
     A stockholder who intends to avoid dividend treatment of the gross proceeds
received by demonstrating that such proceeds are "not essentially equivalent to
a dividend" is urged to consult his or her tax advisor because this test will be
met only if the reduction in his or her proportionate interest in the Company is
a "meaningful reduction" given his or her particular facts and circumstances in
the context of the Offer. The IRS has indicated in published rulings that any
reduction in percentage interest of a shareholder whose relative stock interest
is minimal (an interest of less than 1% should satisfy this requirement) in a
publicly held corporation who exercises no control over corporate affairs may
constitute such a "meaningful reduction."
 
     For purposes of distinguishing dividend treatment from sale or exchange
treatment under the three tests described above, a stockholder is in general
deemed to own Shares actually owned by certain related individuals and entities.
For example, an individual stockholder is considered to own Shares owned
directly or indirectly by or for his or her spouse and his or her children,
grandchildren and parents ("family attribution"). In addition, a stockholder is
considered to own a proportionate number of Shares owned by trusts or estates in
which the stockholder has a beneficial interest, by partnerships in which the
stockholder is a partner, and by corporations in which the stockholder owns,
directly or indirectly, 50% or more in value of the stock ("entity
attribution"). Similarly, Shares directly or indirectly owned by beneficiaries
of estates or trusts, by partners of partnerships and, under certain
circumstances, by stockholders of corporations may be considered owned by these
entities ("entity attribution"). A stockholder may also be deemed to own Shares
which the stockholder has to right to acquire by exercise of an option.
 
     The disposition of Shares by a stockholder pursuant to the Offer will be
regarded as a complete redemption of the stockholder's interest in the Company
notwithstanding continued constructive ownership under the family attribution
rules (or in some cases, under a combination of the family and entity
attribution rules) if all of the Shares actually owned by the stockholder are
disposed of and certain technical requirements are met. In particular the
stockholder may not in this circumstance have any interest in the Company
immediately after the disposition (including an interest as an officer, director
or employee), other than an interest as a creditor.
 
     In the case of a corporate stockholder, any amount treated as a dividend
(i) will generally be eligible for a 70% dividends received deduction under
Section 243 of the Code, subject to the limitations described in Sections 246
and 246A of the Code and (ii) will constitute an "extraordinary dividend" under
Section 1059 of the Code.
 
     Partial Liquidation.  The receipt of cash by a noncorporate stockholder
pursuant to the Offer may also qualify as a sale or exchange (rather than a
dividend) for federal income tax purposes to the extent such cash is treated as
received in "partial liquidation" of the Company under Section 302(b)(4) of the
Code.
 
     In general, a distribution will be treated as in partial liquidation of the
Company if the distribution is "not essentially equivalent to a dividend"
(determined at the corporate level rather than at the stockholder level). The
distribution will be treated as "not essentially equivalent to a dividend" at
the corporate level if it is attributable to a genuine "contraction" in such
corporation. In determining whether a genuine contraction has occurred, the IRS
generally compares the size of the corporation's operations before and after the
events that resulted in the distribution being made. A significant reduction in
the corporation's level of business activities must be shown. For private ruling
purposes, the IRS will not ordinarily issue a ruling that a distribution
qualifies as a distribution in partial liquidation unless the contraction
results in a 20% or greater reduction in: (1) gross revenue, (2) net fair market
value of assets and (3) employees.
 
     Although the contraction of the Company's business activities through the
sale of the Waters Chromatography Business and the Biosearch Division will
result in a 20% or greater reduction in the Company's gross revenues and
employees, this contraction may not result in a 20% or greater reduction in the
net fair market
 
                                       17
<PAGE>   20
 
value of all of the Company's assets. It is therefore uncertain whether the IRS
would issue a private letter ruling that this sale and the distribution of the
proceeds of such sale pursuant to the Offer constitutes a partial liquidation.
Management nevertheless believes that the Company will have undergone a genuine
contraction through its sale and the distribution of the proceeds of such sale
pursuant to the Offer. It is anticipated that, for federal income tax purposes,
a portion of the aggregate Purchase Price payable pursuant to the Offer may be
treated as received in partial liquidation of the Company. The Company will
notify each Stockholder participating in the Offer of the percentage of the
gross proceeds paid to such Stockholder that in the view of the Company may be
treated as received in partial liquidation of the Company. There can be no
assurance, however, that the IRS would agree with the Company's conclusion that
these proceeds are being distributed in its partial liquidation.
 
     Special rules resulting in different tax consequences from those described
herein may apply in the case of Shares acquired as a form of compensation by an
employee of the Company or an affiliate of the Company.
 
     See Section 3 with respect to the application of federal income tax
withholding and backup withholding.
 
     THE TAX DISCUSSION SET FORTH ABOVE IS INCLUDED FOR GENERAL INFORMATION
ONLY. EACH STOCKHOLDER IS URGED TO CONSULT HIS OR HER OWN TAX ADVISOR TO
DETERMINE THE PARTICULAR TAX CONSEQUENCES TO HIM OR HER OF THE OFFER, INCLUDING
THE APPLICABILITY AND EFFECT OF STATE, LOCAL AND FOREIGN TAX LAWS.
 
     14. EXTENSION OF TENDER PERIOD; TERMINATION; AMENDMENTS.  The Company
expressly reserves the right, in its sole discretion, at any time or from time
to time, to extend the period of time during which the Offer is open by giving
oral or written notice of such extension to the Depositary. During any such
extension, all Shares previously tendered and not purchased or withdrawn will
remain subject to the Offer, except to the extent that such Shares may be
withdrawn as set forth in Section 4. The Company also expressly reserves the
right, in its sole discretion, to terminate the Offer and not accept for payment
or pay for any Shares not theretofore accepted for payment or paid for or,
subject to applicable law, to postpone payment for Shares upon the occurrence of
any of the conditions specified in Section 6 hereof by giving oral or written
notice of such termination or postponement to the Depositary and making a public
announcement thereof. The Company's reservation of the right to delay payment
for Shares which it has accepted for payment is limited by Rule 13e-4(f)(5)
promulgated under the Exchange Act, which requires that the Company must pay the
consideration offered or return the Shares tendered promptly after termination
or withdrawal of a tender offer. Subject to compliance with applicable law, the
Company further reserves the right, in its sole discretion, to amend the Offer
in any respect. Amendments to the Offer may be made at any time or from time to
time effected by public announcement thereof, such announcement, in the case of
an extension, to be issued no later than 9:00 A.M., New York City time, on the
next business day after the previously scheduled Expiration Date. Any public
announcement made pursuant to the Offer will be disseminated promptly to
stockholders in a manner reasonably designed to inform stockholders of such
change. Without limiting the manner in which the Company may choose to make a
public announcement, except as required by applicable law, the Company shall
have no obligation to publish, advertise or otherwise communicate any such
public announcement other than by making a release to the Dow Jones News
Service.
 
     If the Company materially changes the terms of the Offer or the information
concerning the Offer, the Company will extend the Offer to the extent required
by Rules 13e-4(e)(2) and 13e-4(f)(1)(ii) promulgated under the Exchange Act.
These rules provide that the minimum period during which an offer must remain
open following material changes in the terms of the offer or information
concerning the offer (other than a change in price, change in the dealer's
soliciting fee or a change in percentage of securities sought) will depend on
the facts and circumstances, including the relative materiality of such terms or
information. If (i) the Company increases or decreases the consideration offered
for Shares pursuant to the Offer or the amount of the dealer's soliciting fee or
the Company increases the number of Shares being sought by an amount exceeding
2% of the outstanding Shares, or the Company decreases the number of Shares
being sought and (ii) the Offer is scheduled to expire at any time earlier than
the expiration of a period ending on the tenth business day from, and including,
the date that notice of such increase or decrease is first published, sent or
given, the Offer will be extended until the expiration of such period of ten
business days.
 
                                       18
<PAGE>   21
 
     15. FEES.  Other than as described below, no fees will be paid to brokers,
dealers or others by the Company in connection with the Offer.
 
     Dealer Manager.  J. P. Morgan Securities Inc. ("J. P. Morgan") has been
retained by the Company to act as Dealer Manager in connection with the Offer.
J. P. Morgan will receive a fee of $.04 per share tendered for its services as
Dealer Manager. J. P. Morgan will also be reimbursed by the Company for its
out-of-pocket expenses, including attorneys' fees, and will be indemnified
against certain liabilities, including liabilities under the federal securities
laws, in connection with the Offer. In addition, J.P. Morgan has been retained
as the Company's agent in connection with the open market repurchase program
currently expected to commence upon the completion of this Offer, for which it
will also receive reasonable and customary compensation. J. P. Morgan has from
time to time provided investment banking services to the Company, including
acting as financial advisor to the Company in connection with the Company's
share repurchase program for which J. P. Morgan has received, or will receive,
customary compensation. It is expected that J. P. Morgan will continue to
provide such services to the Company in the future.
 
     Depositary and Information Agent.  The Company has retained D. F. King &
Co., Inc. to act as Information Agent and The First National Bank of Boston to
act as Depositary in connection with the Offer. The Information Agent may
contact holders of Shares by mail, telephone, telex, telegraph and personal
interviews and may request brokers, dealers and other nominee shareholders to
forward materials relating to the Offer to beneficial owners. The Information
Agent and the Depositary will each receive reasonable and customary compensation
for their respective services, will be reimbursed for certain reasonable
out-of-pocket expenses and will be indemnified against certain liabilities and
expenses in connection with the Offer, including liabilities under the Federal
securities laws. The Depositary has also rendered transfer services to the
Company in the past for which it has received customary compensation, and can be
expected to render similar services to the Company in the future. The
Information Agent may render information services to the Company in the future.
Neither the Depositary nor the Information Agent has been retained, or is
authorized to, make recommendations in connection with the Offer.
 
     Brokers, dealers, commercial banks and trust companies will, upon request,
be reimbursed by the Company for reasonable and necessary costs and expenses
incurred by them in forwarding materials to their customers.
 
     16. MISCELLANEOUS.  The Offer is not being made to, nor will the Company
accept tenders from, holders of Shares in any state of the United States or any
foreign jurisdiction in which the Offer or the acceptance thereof would not be
in compliance with the laws of such state or foreign jurisdiction. The Company
is not aware of any state or foreign jurisdiction the laws of which would
prohibit the Offer or such acceptance. In those jurisdictions whose laws require
the Offer to be made by a licensed broker or dealer, the Offer is being made on
behalf of the Company by the Dealer Manager or one or more registered brokers or
dealers licensed under laws of such jurisdictions.
                                            MILLIPORE CORPORATION
 
                                       19
<PAGE>   22
 
                                   SCHEDULE A
 
<TABLE>
<CAPTION>
 DATE           NAME                               TRANSACTION
- -------    ---------------   --------------------------------------------------------
<C>        <S>               <C>
7/29/94    John E. Lary       Sale -- 2200 shares at $52.75
7/29/94    Geoffrey Nunes    -Sale -- 10,700 shares at prices ranging from $52.00 -
                             $52.125
                             -Exercise and Sale -- of 20,000 stock options at
                             exercise prices ranging from $29.00 - $33.50 and sale
                             prices ranging from $51.875 to $52.00
</TABLE>
 
                                       20
<PAGE>   23
 
     The Depositary will accept legible copies of the Letter of Transmittal,
which should be sent, together with certificates for the Shares tendered and any
other required documents to the Depositary at one of its addresses.
 
                        The Depositary for the Offer is:
 
                       THE FIRST NATIONAL BANK OF BOSTON
 
<TABLE>
<S>                                    <C>                <C>
              By Mail:                                                  By Hand:
 The First National Bank of Boston                              BancBoston Trust Company
   Shareholder Services Division                                      of New York
           P.O. Box 1889                                        55 Broadway, Third Floor
         Mail Stop 45-01-19                                        New York, New York
    Boston, Massachusetts 02105
     By Facsimile Transmission:           Telephone:             By Overnight Courier:
           (617) 575-2232               (617) 575-2700     The First National Bank of Boston
           (617) 575-2233                                    Shareholder Services Division
  (for Eligible Institutions Only)                                 Mail Stop 45-01-19
        Confirm by Telephone                                       150 Royall Street
                                                              Canton, Massachusetts 02021
</TABLE>
 
     Please contact the Information Agent at the telephone numbers and addresses
below with any questions or requests for assistance or additional copies of the
Offer to Purchase and Letters of Transmittal and Notices of guaranteed delivery.
 
                    The Information Agent for the Offer is:
 
                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                           (800) 488-8095 (toll free)
 
                      The Dealer Manager for the Offer is:
 
                          J.P. MORGAN SECURITIES INC.
                                 60 Wall Street
                         New York, New York 10260-0060
                         (212) 648-7078 (call collect)

<PAGE>   1
                                                                 EXHIBIT (a)(3)

 
                       [MILLIPORE CORPORATION LETTERHEAD]
 
                                                                 August 25, 1994
 
To Our Stockholders:
 
      As you may be aware, Millipore Corporation is offering to purchase up to
3.5 million shares of its Common Stock from its stockholders at a price not
greater than $60 or less than $52 per share (the "Offer"). The Company is
conducting the Offer through a procedure commonly referred to as a "Dutch
Auction". This procedure allows you to select the price within the stated price
range at which you are willing to sell your shares to the Company. Based upon
the number of shares tendered and the prices specified by tendering
stockholders, the Company will determine the single per share price within that
price range (the "Purchase Price") that will allow it to buy all 3,500,000
shares if 3,500,000 shares are tendered at less than or equal to $60 per share.
If more than 3,500,000 shares are tendered at or below the Purchase Price, only
a pro-rata portion may be purchased. Payment to selling stockholders will be
made in cash without the requirement of any fees or, except in limited
circumstances, transfer taxes. All shares which are tendered and not purchased
will be returned to the stockholder.
 
      The Offer is explained in detail in the enclosed Offer to Purchase and
Letter of Transmittal. If you want to tender your shares, the instructions for
tendering are also set forth in detail in the enclosed materials. I encourage
you to read these materials carefully before making any decision with respect to
the Offer. Neither the Company nor its Board of Directors makes any
recommendation to any stockholder whether to tender or to refrain from tendering
shares. I have been advised that no director or executive officer of the Company
intends to tender any shares pursuant to the Offer.
 
      Please note that the Offer will expire at 12:00 midnight, New York City
time, on September 22, 1994, unless it is extended. Should you have questions
regarding this Offer, please call D.F. King & Co., Inc. at (800) 488-8095 (toll
free).
 
                                            Very truly yours,
 
                                            JOHN A. GILMARTIN

<PAGE>   1
                                                                  EXHIBIT (a)(4)

 
                          J.P. MORGAN SECURITIES INC.
                                 60 WALL STREET
                         NEW YORK, NEW YORK 10260-0060
                                    OFFER BY
 
                             MILLIPORE CORPORATION
                              TO PURCHASE FOR CASH
                   UP TO 3,500,000 SHARES OF ITS COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
 
                                                                 August 25, 1994
 
To Brokers, Dealers, Commercial Banks,
  Trust Companies and Other Nominees:
 
     We have been appointed by Millipore Corporation, a Massachusetts
corporation (the "Company"), to act as Dealer Manager in connection with the
Company's offer to purchase for cash up to 3,500,000 shares of its Common Stock,
$1.00 par value per share (such shares, together with all other outstanding
shares of Common Stock of the Company including the associated stock purchase
rights (the "Rights") issued pursuant to the Shareholder Rights Agreement dated
as of April 15, 1988 between the Company and The First National Bank of Boston,
as Rights Agent, are herein referred to as the "Shares") at a price not greater
than $60.00 nor less than $52.00 per Share upon the terms and subject to the
conditions set forth in the Company's Offer to Purchase dated August 25, 1994
(the "Offer to Purchase") and the related Letter of Transmittal (which together
constitute the "Offer"). The Company will determine the single per Share price
(not greater than $60.00 nor less than $52.00 per Share, net to the seller in
cash) that it will pay for the Shares validly tendered pursuant to the Offer
(the "Purchase Price") taking into account the number of Shares so tendered and
the prices specified by tendering stockholders. The Company will select the
Purchase Price that will allow it to purchase 3,500,000 Shares (or such lesser
number as are validly tendered at prices not greater than $60.00 nor less than
$52.00 per Share) pursuant to the Offer. The Company will purchase all Shares
validly tendered at prices at or below the Purchase Price and not withdrawn upon
the terms and subject to the conditions set forth in the Offer to Purchase and
the related Letter of Transmittal, including the provisions relating to "odd
lot" tenders and proration described in the Offer to Purchase.
 
     The Offer is not conditioned upon any minimum number of shares being
tendered. The Offer is, however, subject to the conditions set forth in Section
6 of the Offer to Purchase.
 
     For your information and for forwarding to your clients for whom you hold
Shares registered in your name or in the name of your nominee, we are enclosing
the following documents:
 
          1. Offer to Purchase dated August 25, 1994;
 
          2. Letter of Transmittal for your use and for the information of your
     clients, together with Guidelines for Certification of Taxpayer
     Identification Number on Substitute Form W-9 providing information relating
     to backup federal income tax withholding;
 
          3. Notice of Guaranteed Delivery to be used to accept the Offer if the
     Shares and all other required documents cannot be delivered to the
     Depositary by the Expiration Date (as defined in the Offer to Purchase);
 
          4. Letter dated August 25, 1994 from John A. Gilmartin, President and
     Chief Executive Officer of the Company, to the Company's Stockholders;
<PAGE>   2
 
          5. A form of letter that may be sent to your clients for whose
     accounts you hold Shares registered in your name or in the name of your
     nominee, with space provided for obtaining such clients' instructions with
     regard to the Offer; and
 
          6. Return envelope addressed to The First National Bank of Boston, as
     Depositary for the Shares.
 
     WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE, THE OFFER, THE
PRORATION PERIOD AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
TIME, ON SEPTEMBER 22, 1994, UNLESS THE OFFER IS EXTENDED.
 
     In order to accept the Offer, a duly executed and properly completed Letter
of Transmittal and any required signature guarantees, or an Agent's Message (as
defined in the Offer to Purchase) in connection with book-entry delivery of
Shares or Rights, and all other required documents should be sent to the
Depositary and certificates representing the tendered shares should be
delivered, all in accordance with the instructions set forth in the Letter of
Transmittal and Offer to Purchase.
 
     The Company will not pay any fees or commissions to any broker or dealer or
other person (other than the Dealer Manager as described in the Offer to
Purchase) for soliciting tenders of Shares pursuant to the Offer. The Company
will, however, upon request, reimburse brokers, dealers, commercial banks and
trust companies for reasonable and necessary costs and expenses incurred by them
in forwarding materials to their customers. The Company will pay all stock
transfer taxes applicable to its purchase of Shares pursuant to the Offer,
subject to Instruction 8 of the Letter of Transmittal. No broker, dealer, bank,
trust company or fiduciary shall be deemed to be either our agent or the agent
of the Company, the Information Agent or the Depositary for the purposes of the
Offer.
 
     Any inquiries you may have with respect to the Offer should be addressed
to, and additional copies of the enclosed materials may be obtained from, the
Information Agent or the undersigned at the addresses and telephone numbers set
forth on the back cover of the Offer to Purchase.
 
                                            Very truly yours,
 
                                            J.P. MORGAN SECURITIES INC.
 
     NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU
THE AGENT OF THE COMPANY, THE DEALER MANAGER, THE INFORMATION AGENT OR THE
DEPOSITARY, OR AUTHORIZE YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY
STATEMENT ON BEHALF OF ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE
DOCUMENTS ENCLOSED HEREWITH AND THE STATEMENTS CONTAINED THEREIN.
 
                                        2

<PAGE>   1
                                                                 EXHIBIT (a)(5)

 
                                    OFFER BY
 
                             MILLIPORE CORPORATION
 
                              TO PURCHASE FOR CASH
 
                   UP TO 3,500,000 SHARES OF ITS COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
 
To Our Clients:
 
     Enclosed for your consideration are the Offer to Purchase dated August 25,
1994 (the "Offer to Purchase") and the related Letter of Transmittal (which
together constitute the "Offer") in connection with the Offer by Millipore
Corporation, a Massachusetts corporation (the "Company"), to purchase for cash
up to 3,500,000 shares of its Common Stock, $1.00 par value per share (such
shares, together with all other outstanding shares of Common Stock of the
Company, including the associated stock purchase rights (the "Rights") issued
pursuant to the Shareholder Rights Agreement dated as of April 15, 1988 between
the Company and The First National Bank of Boston, as Rights Agent, are herein
referred to as the "Shares") at a price not greater than $60.00 nor less than
$52.00 per Share upon the terms and subject to the conditions of the Offer. The
Company will determine the single per Share price (not greater than $60.00 nor
less than $52.00 per Share) that it will pay for the Shares validly tendered
pursuant to the Offer (the "Purchase Price") taking into account the number of
Shares so tendered and the prices specified by tendering stockholders. The
Company will select the Purchase Price that will allow it to purchase 3,500,000
Shares (or such lesser number as are validly tendered at prices not greater than
$60.00 nor less than $52.00 per Share) pursuant to the Offer. The Company will
purchase all Shares validly tendered at prices at or below the Purchase Price
and not withdrawn upon the terms and subject to the conditions of the Offer,
including the provisions thereof relating to "odd lot" tenders and proration
described in the Offer to Purchase. We are the holder of record of Shares held
for your account. A tender of such Shares can be made only by us as the holder
of record and pursuant to your instructions. THE LETTER OF TRANSMITTAL IS
FURNISHED TO YOU FOR YOUR INFORMATION ONLY AND CANNOT BE USED BY YOU TO TENDER
SHARES HELD BY US FOR YOUR ACCOUNT.
 
     As described in the Offer to Purchase, the Company reserves the right to
purchase more than 3,500,000 Shares but does not currently plan to do so. The
Company will return all Shares not purchased, including Shares tendered at
prices greater than the Purchase Price and Shares not purchased as a result of
proration.
 
     WE REQUEST INSTRUCTIONS AS TO WHETHER YOU WISH US TO TENDER ANY OR ALL OF
THE SHARES HELD BY US FOR YOUR ACCOUNT, UPON THE TERMS AND SUBJECT TO THE
CONDITIONS SET FORTH IN THE OFFER TO PURCHASE AND THE LETTER OF TRANSMITTAL.
 
     Please note carefully the following:
 
          1. Price Range:  You may tender Shares at a price not greater than
     $60.00 nor less than $52.00 per Share, as indicated in the attached
     instruction form, net to you in cash. You may specify that you wish to
     tender your Shares at the Purchase Price established by the Company.
 
          2. Expiration Date:  The offer, the proration period and withdrawal
     rights expire at 12:00 Midnight, New York City time, on September 22, 1994,
     unless the Company extends the Offer.
 
          3. Conditions:  The Offer is not conditioned upon any minimum number
     of Shares being tendered. The Offer is subject to the conditions set forth
     in Section 6 of the Offer to Purchase.
 
          4. Transfer Taxes:  Any stock transfer taxes applicable to the sale of
     Shares to the Company pursuant to the Offer will be paid by the Company,
     except as otherwise provided in Instruction 8 of the Letter of Transmittal.
 
          5. Special Treatment for "Odd Lot" Holders:  If you owned beneficially
     as of the close of business on August 24, 1994 an aggregate of fewer than
     100 Shares and you instruct us to tender at or below the
<PAGE>   2
 
     Purchase Price on your behalf all such Shares prior to the expiration of
     the Offer and check the box captioned "Odd Lots" in the instruction form,
     all such Shares will be accepted for purchase before proration, if any, of
     the purchase of other Shares properly tendered at or below the Purchase
     Price.
 
          6. Tenders at More Than One Price:  Please instruct us if you wish to
     tender some Shares at one price and other Shares at another price. We must
     submit separate Letters of Transmittal on your behalf for each price you
     designate. The same Shares may not be tendered at more than one price.
 
          7. Payment for Shares:  Payment for Shares purchased pursuant to the
     Offer will in all cases be made only after timely receipt by The First
     National Bank of Boston (the "Depositary") of (a) Share Certificates or
     timely confirmation of the book-entry transfer of such Shares, into the
     account maintained by the Depositary at The Depository Trust Company, the
     Midwest Securities Trust Company or the Philadelphia Depository Trust
     Company (collectively, the "Book-Entry Transfer Facilities"), pursuant to
     the procedures set forth in Section 3 of the Offer to Purchase, (b) the
     Letter of Transmittal (or a facsimile thereof), properly completed and duly
     executed, with any required signature guarantees or an Agent's Message (as
     defined in the Offer to Purchase), in connection with a book-entry
     delivery, and (c) any other documents required by the Letter of
     Transmittal. Accordingly, payment may not be made to all tendering
     stockholders at the same time depending upon when certificates for or
     confirmations of book-entry transfer of such Shares into the Depositary's
     account at a Book-Entry Transfer Facility are actually received by the
     Depositary.
 
     If you wish to have us tender any or all of your Shares, please so instruct
us by completing, executing, detaching and returning to us the instruction form
on the detachable part hereof. An envelope to return your instructions to us is
enclosed. If you authorize tender of your Shares, all such Shares will be
tendered unless otherwise specified on the detachable part hereof.
 
     YOUR INSTRUCTIONS SHOULD BE FORWARDED TO US IN AMPLE TIME TO PERMIT US TO
SUBMIT A TENDER ON YOUR BEHALF ON OR BEFORE THE EXPIRATION OF THE OFFER. THE
OFFER, THE PRORATION PERIOD AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW
YORK CITY TIME, ON SEPTEMBER 22, 1994 UNLESS THE COMPANY EXTENDS THE OFFER.
 
     As described in the Offer to Purchase, if fewer than all Shares validly
tendered at or below the Purchase Price prior to the expiration of the Offer are
to be purchased by the Company, the Company will purchase Shares in the
following order of priority: (a) all "odd lot" Shares tendered at or below the
Purchase Price prior to the expiration of the Offer by any stockholder who owned
beneficially as of the close of business on August 24, 1994 an aggregate of
fewer than 100 Shares, and who validly tenders all of such Shares (partial
tenders will not qualify for this preference); and (b) then, after purchase of
the foregoing Shares, all other Shares validly tendered at or below the Purchase
Price and not withdrawn prior to the expiration of the Offer on a pro rata
basis, if necessary (with appropriate adjustments to avoid purchases of
fractional Shares).
 
     The Offer is not being made to, nor will tenders be accepted from or on
behalf of, holders of Shares in any jurisdiction in which the making of the
Offer or acceptance thereof would not be in compliance with the laws of such
jurisdiction. In those jurisdictions the laws of which require that the Offer be
made by a licensed broker or dealer, the Offer shall be deemed to be made on
behalf of the Company by J. P. Morgan Securities Inc. or one or more registered
brokers or dealers licensed under the laws of such jurisdiction.
 
                                   IMPORTANT
 
     FOR US TO BE ABLE TO TENDER ALL OR PART OF YOUR SHARES, YOU MUST:
 
          (1) INDICATE THE NUMBER OF SHARES YOU WISH TO TENDER -- ALL SHARES BY
     CHECKING THE BOX ON THE FORM ON THE FOLLOWING PAGE OR FEWER THAN ALL SHARES
     BY CHECKING THE BOX AND INDICATING IN THE SPACE PROVIDED THE NUMBER OF
     SHARES YOU WISH TO TENDER;
 
                                      AND
 
          (2) INDICATE THE PRICE AT WHICH YOU WISH TO TENDER IN THE SPACE
     PROVIDED ON THE LAST PAGE.
 
                                        2
<PAGE>   3
 
                          INSTRUCTIONS WITH RESPECT TO
                           OFFER TO PURCHASE FOR CASH
                     UP TO 3,500,000 SHARES OF COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
                                       OF
 
                             MILLIPORE CORPORATION
 
     The undersigned acknowledge(s) receipt of your letter and the enclosed
Offer to Purchase dated August 25, 1994, and the related Letter of Transmittal
(which together constitute the "Offer"), in connection with the offer by
Millipore Corporation to purchase for cash up to 3,500,000 shares of its Common
Stock, $1.00 par value per share (such shares, together with all other
outstanding shares of Common Stock of the Company, are herein referred to as the
"Shares") (including the associated stock purchase rights) at a price not
greater than $60.00 nor less than $52.00 per Share, net to the undersigned in
cash.
 
     The Company will determine a single per Share price (not greater than
$60.00 nor less than $52.00 per Share) that it will pay for the Shares validly
tendered pursuant to the Offer (the "Purchase Price") taking into account the
number of Shares so tendered and the prices specified by tendering stockholders.
The Company will select the Purchase Price that will allow it to buy 3,500,000
Shares (or such lesser number as are properly tendered at prices not greater
than $60.00 nor less than $52.00 per Share) pursuant to the Offer.
 
     INSTRUCTIONS:  For us to be able to tender all or any part of your Shares,
you must:
 
          (1) Indicate the number of Shares you wish to tender (all by checking
     the box and less than all by identifying the number in the space provided);
                                      AND
 
          (2) Indicate on the next page the price at which you wish to tender.
- --------------------------------------------------------------------------------
             The undersigned hereby instruct(s) you to tender to the
           Company the number of Shares indicated below or, if no
           number is indicated, all Shares held by you for the
           account of the undersigned, upon the terms and subject to
           the conditions set forth in the Offer to Purchase and the
           related Letter of Transmittal.
 
           / / By checking this box, all Shares held by us for your
               account, including fractional Shares, will be
               tendered. If fewer than all Shares are to be tendered,
               please check the box and indicate below the aggregate
               number of Shares to be tendered by us.
 
             ------------------------------------------------- Shares*
 
               * Unless otherwise indicated, it will be assumed that
                 all Shares held by us for your account are to be
                 tendered.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                    ODD LOTS
 
           / / By checking this box, the undersigned represents that
               the undersigned owned beneficially as of the close of
               business on August 24, 1994 an aggregate of fewer than
               100 Shares and is tendering all of such Shares.
- --------------------------------------------------------------------------------
<PAGE>   4
 
                        PRICE (IN DOLLARS) PER SHARE AT
                        WHICH SHARES ARE BEING TENDERED
- --------------------------------------------------------------------------------
 
                              CHECK ONLY ONE BOX.
                     IF MORE THAN ONE BOX IS CHECKED, OR IF
                      NO BOX IS CHECKED, THERE IS NO VALID
                               TENDER OF SHARES.
 
                            SHARES TENDERED AT PRICE
                          DETERMINED BY DUTCH AUCTION
 
/ / The undersigned wants to maximize the chance of having the Company purchase
    all the Shares the undersigned is tendering (subject to the possibility of
    proration). Accordingly, by checking this one box INSTEAD OF ONE OF THE
    PRICE BOXES BELOW, the undersigned hereby tenders Shares and is willing to
    accept the Purchase Price resulting from the Dutch auction tender process.
    This action could result in receiving a price per Share as low as $52.00 or
    as high as $60.00.
 
                                         OR
 
                              SHARES TENDERED AT PRICE
                             DETERMINED BY STOCKHOLDER
 
<TABLE>
<S>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>
/ /  $ 52.00     / /  $ 53.00     / /  $ 54.00     / /  $ 55.00     / /  $ 56.00     / /  $ 57.00     / /  $ 58.00     / /  $ 59.00
/ /  $52.125     / /  $53.125     / /  $54.125     / /  $55.125     / /  $56.125     / /  $57.125     / /  $58.125     / /  $59.125
/ /  $52.250     / /  $53.250     / /  $54.250     / /  $55.250     / /  $56.250     / /  $57.250     / /  $58.250     / /  $59.250
/ /  $52.375     / /  $53.375     / /  $54.375     / /  $55.375     / /  $56.375     / /  $57.375     / /  $58.375     / /  $59.375
/ /  $52.500     / /  $53.500     / /  $54.500     / /  $55.500     / /  $56.500     / /  $57.500     / /  $58.500     / /  $59.500
/ /  $52.625     / /  $53.625     / /  $54.625     / /  $55.625     / /  $56.625     / /  $57.625     / /  $58.625     / /  $59.625
/ /  $52.750     / /  $53.750     / /  $54.750     / /  $55.750     / /  $56.750     / /  $57.750     / /  $58.750     / /  $59.750
/ /  $52.875     / /  $53.875     / /  $54.875     / /  $55.875     / /  $56.875     / /  $57.875     / /  $58.875     / /  $59.875
                                                                                                                       / /  $ 60.00
</TABLE>
 
- --------------------------------------------------------------------------------
                                   SIGN HERE
 
   ---------------------------------        ---------------------------------
             SIGNATURE(S)                       PLEASE PRINT NAME(S) AND
                                                    ADDRESS(ES) HERE
   ---------------------------------
   Area Code and Telephone Number           ---------------------------------


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

   Dated ____________________ , 1994        ---------------------------------
                                            
   Taxpayer ID No. or
   Social Security No. _____________

- --------------------------------------------------------------------------------
 
                                        2

<PAGE>   1
                                                               EXHIBIT (a)(6)

 
                             LETTER OF TRANSMITTAL
 
                        TO TENDER SHARES OF COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
                                       OF
 
                             MILLIPORE CORPORATION
                       PURSUANT TO ITS OFFER TO PURCHASE
                             DATED AUGUST 25, 1994
 
        THE OFFER, THE PRORATION PERIOD AND WITHDRAWAL RIGHTS EXPIRE AT
                     12:00 MIDNIGHT, NEW YORK CITY TIME, ON
               SEPTEMBER 22, 1994, UNLESS THE OFFER IS EXTENDED.
 
              TO:   THE FIRST NATIONAL BANK OF BOSTON, DEPOSITARY
 
<TABLE>
 <S>                                  <C>                  <C>
            By Mail:                                                  By Hand:
   The First National Bank of
              Boston                                          BancBoston Trust Company
 Shareholder Services Division                                      of New York
         P.O. Box 1889                                        55 Broadway, Third Floor
       Mail Stop 45-01-19                                        New York, New York
  Boston, Massachusetts 02105

   By Facsimile Transmission:           Telephone:             By Overnight Courier:
         (617) 575-2232               (617) 575-2700     The First National Bank of Boston
         (617) 575-2233                                    Shareholder Services Division
(for Eligible Institutions Only)                                 Mail Stop 45-01-19
      Confirm by Telephone                                       150 Royall Street
                                                            Canton, Massachusetts 02021
</TABLE>
 
     DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR
TRANSMISSION OF INSTRUCTIONS TO A FACSIMILE NUMBER OTHER THAN THE ONES LISTED
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.
 
     This Letter of Transmittal is to be used only if certificates are to be
forwarded herewith unless an Agent's Message (as defined in the Offer to
Purchase) is utilized or if delivery of Shares (as defined below) is to be made
by book-entry transfer to the Depositary's account at The Depository Trust
Company ("DTC"), Midwest Securities Trust Company ("MSTC") or Philadelphia
Depository Trust Company ("PHILADEP"), which, together with DTC and MSTC, are
hereinafter collectively referred to as the "Book-Entry Transfer Facilities")
pursuant to the procedures set forth in Section 3 of the Offer to Purchase.
 
     Stockholders who cannot deliver their Shares and all other documents
required hereby to the Depositary by the Expiration Date (as defined in the
Offer to Purchase) (or who are unable to comply with the procedures for
book-entry transfer on a timely basis) must tender their Shares pursuant to the
guaranteed delivery procedure set forth in Section 3 of the Offer to Purchase.
See Instruction 2. Delivery of documents to one of the Book-Entry Transfer
Facilities does not constitute delivery to the Depositary.

<PAGE>   2
 
<TABLE>
- ------------------------------------------------------------------------------------------------------------------
                                            DESCRIPTION OF SHARES TENDERED
- ------------------------------------------------------------------------------------------------------------------
<CAPTION>
             Name(s) and Address(es) of Registered Holder(s)                            Shares Tendered
                       (Please fill in, if blank)                            (Attach additional list if necessary)
- ------------------------------------------------------------------------------------------------------------------
                                                                                             Total Number
                                                                                              of Shares      Number
                                                                             Certificate    Represented by  of Shares
                                                                             Number(s)*     Certificate(s)  Tendered**
<S>                                                                         <C>                <C>           <C>
                                                                            ------------------------------------------
                                                                            ------------------------------------------
                                                                            ------------------------------------------
                                                                            ------------------------------------------
                                                                            Total Shares
- ----------------------------------------------------------------------------------------------------------------------
<FN>
   * Need not be completed by stockholders tendering by book-entry transfer.
  ** Unless otherwise indicated, it will be assumed that all Shares represented by any certificates delivered to the
     Depositary are being tendered. See Instruction 4.
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
 
/ / CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO
    THE DEPOSITARY'S ACCOUNT AT ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND
    COMPLETE THE FOLLOWING:

    Name of Tendering Institution _____________________________________________

    / / DTC  / / MSTC  / / PHILADEP (check one)   Account No. _________________
 
/ / CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
    FOLLOWING:

    Name(s) of Tendering Stockholder(s) _______________________________________

    Date of Execution of Notice of Guaranteed Delivery ________________________

    Name of Institution which Guaranteed Delivery _____________________________
 
    If delivery is by book-entry transfer: ____________________________________

         Name of Tendering Institution ________________________________________

    / / DTC  / / MSTC  / / PHILADEP (check one)  Account No. __________________

    Transaction Code No. ______________________________________________________
 
                                        2
<PAGE>   3
 
                    NOTE:  SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
Ladies and Gentlemen:
 
     The undersigned hereby tenders to Millipore Corporation, a Massachusetts
corporation (the "Company"), the above-described shares of Common Stock, $1.00
par value per share (such shares, together with all other outstanding shares of
Common Stock of the Company, including the associated stock purchase rights (the
"Rights") issued pursuant to the Stockholder Rights Agreement dated as of April
15, 1988 between the Company and The First National Bank of Boston, as Rights
Agent, are herein referred to as the "Shares"), pursuant to the Company's offer
to purchase up to 3,500,000 Shares at a price per Share hereinafter set forth,
net to the seller in cash, upon the terms and subject to the conditions set
forth in the Offer to Purchase dated August 25, 1994 (the "Offer to Purchase"),
receipt of which is hereby acknowledged, and in this Letter of Transmittal
(which together constitute the "Offer"). Absent circumstances causing the Rights
to become exercisable or separately tradeable prior to the Expiration Date (as
defined in the Offer to Purchase), the tender of any Shares pursuant to the
Offer will include the tender of associated Rights. Unless the context otherwise
requires, all references to Shares shall include the associated Rights.
 
     Subject to and effective upon acceptance for payment of and payment for the
Shares tendered herewith in accordance with the terms of the Offer, the
undersigned hereby sells, assigns and transfers to or upon the order of the
Company all right, title and interest in and to all the Shares that are being
tendered hereby and appoints the Depositary the true and lawful agent and
attorney-in-fact of the undersigned with respect to such Shares, with full power
of substitution (such power of attorney being deemed to be an irrevocable power
coupled with an interest), to (a) deliver certificates for such Shares, or
transfer ownership of such Shares on the account books maintained by any of the
Book-Entry Transfer Facilities, together, in any such case, with all
accompanying evidences of transfer and authenticity, to or upon the order of the
Company, (b) present such Shares for transfer and cancellation on the books of
the Company and (c) receive all benefits and otherwise exercise all rights of
beneficial ownership of such Shares, all in accordance with the terms of the
Offer.
 
     The undersigned hereby represents and warrants that the undersigned has a
net long position in the Shares at least equal to the Shares being tendered and
has full power and authority to tender, sell, assign and transfer the Shares
tendered hereby and that, when the same are accepted for payment by the Company,
the Company will acquire good and unencumbered title thereto, free and clear of
all liens, restrictions, charges and encumbrances and not subject to any adverse
claims. The undersigned will, upon request, execute and deliver any additional
documents deemed by the Depositary or the Company to be necessary or desirable
to complete the sale, assignment and transfer of the Shares tendered hereby and
has read, understands and agrees with, all the terms of the Offer.
 
     The undersigned understands that, upon the terms and subject to the
conditions of the Offer, the Company will determine the per Share price (not
greater than $60.00 nor less than $52.00 per Share) (the "Purchase Price") that
it will pay for Shares validly tendered and not withdrawn pursuant to the Offer
taking into account the number of Shares so tendered and the prices specified by
tendering stockholders. The undersigned understands that the Company will select
the Purchase Price that will enable it to purchase 3,500,000 Shares (or such
lesser number of Shares as are validly tendered at prices not greater than
$60.00 nor less than $52.00 per Share) pursuant to the Offer. The undersigned
understands that under certain circumstances set forth in the Offer to Purchase,
the Company may terminate or amend the Offer or may postpone the acceptance for
payment of, or payment for, Shares tendered or may accept for payment fewer than
all of the Shares tendered hereby. The undersigned understands that the Company
will not pay any separate consideration for the Rights associated with such
Shares. The undersigned understands that tenders of Shares pursuant to any one
of the procedures described in Section 2 or 3 of the Offer to Purchase and in
the instructions hereto will constitute an agreement between the undersigned and
the Company upon the terms and subject to the conditions of the Offer.
 
     Unless otherwise indicated under "Special Payment Instructions", please
issue the check for the Purchase Price of any Shares purchased (less the amount
of any federal income or backup withholding tax
 
                                        3
<PAGE>   4
 
required to be withheld) and return any Shares not tendered or not purchased, in
the name(s) of the undersigned (and, in the case of Shares tendered by
book-entry transfer, by credit to the account at the Book-Entry Transfer
Facility designated above). Similarly, unless otherwise indicated under "Special
Delivery Instructions", please mail the check for the Purchase Price of any
Shares purchased (less the amount of any federal income or backup withholding
tax required to be withheld) and any certificates for Shares not tendered or not
purchased (and accompanying documents, as appropriate) to the undersigned at the
address shown below the undersigned's signature(s). In the event that both
"Special Payment Instructions" and "Special Delivery Instructions" are
completed, please issue the check for the Purchase Price of any Shares purchased
(less the amount of any federal income or backup withholding tax required to be
withheld) and return any Shares not tendered or not purchased in the name(s) of,
and mail said check and any certificates to, the person(s) so indicated. The
undersigned recognizes that the Company has no obligation, pursuant to the
"Special Payment Instructions", to transfer any Shares from the name of the
registered holder(s) thereof, or to order the registration or transfer of such
Shares tendered by book-entry transfer, if the Company does not accept for
payment any of the Shares so tendered.
 
     All authority herein conferred or agreed to be conferred shall survive the
death or incapacity of the undersigned and any obligation of the undersigned
hereunder shall be binding upon the heirs, personal representatives, successors
and assigns of the undersigned. Except as stated in the Offer, this tender is
irrevocable.
 
                                        4
<PAGE>   5
 
                        PRICE (IN DOLLARS) PER SHARE AT
                        WHICH SHARES ARE BEING TENDERED
                              (SEE INSTRUCTION 5)
 
- --------------------------------------------------------------------------------
 
                              CHECK ONLY ONE BOX.
                     IF MORE THAN ONE BOX IS CHECKED, OR IF
                      NO BOX IS CHECKED, THERE IS NO VALID
                               TENDER OF SHARES.
                            SHARES TENDERED AT PRICE
                          DETERMINED BY DUTCH AUCTION

/ / The undersigned wants to maximize the chance of having the Company purchase
    all the Shares the undersigned is tendering (subject to the possibility of
    proration). Accordingly, by checking this one box INSTEAD OF ONE OF THE
    PRICE BOXES BELOW, the undersigned hereby tenders Shares and is willing to
    accept the Purchase Price resulting from the Dutch auction tender process.
    This action could result in receiving a price per Share as low as $52.00 or
    as high as $60.00.
 
                                         OR
 
                              SHARES TENDERED AT PRICE
                             DETERMINED BY STOCKHOLDER
 
<TABLE>
<S>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>
/ /  $ 52.00     / /  $ 53.00     / /  $ 54.00     / /  $ 55.00     / /  $ 56.00     / /  $ 57.00     / /  $ 58.00     / /  $ 59.00
/ /  $52.125     / /  $53.125     / /  $54.125     / /  $55.125     / /  $56.125     / /  $57.125     / /  $58.125     / /  $59.125
/ /  $52.250     / /  $53.250     / /  $54.250     / /  $55.250     / /  $56.250     / /  $57.250     / /  $58.250     / /  $59.250
/ /  $52.375     / /  $53.375     / /  $54.375     / /  $55.375     / /  $56.375     / /  $57.375     / /  $58.375     / /  $59.375
/ /  $52.500     / /  $53.500     / /  $54.500     / /  $55.500     / /  $56.500     / /  $57.500     / /  $58.500     / /  $59.500
/ /  $52.625     / /  $53.625     / /  $54.625     / /  $55.625     / /  $56.625     / /  $57.625     / /  $58.625     / /  $59.625
/ /  $52.750     / /  $53.750     / /  $54.750     / /  $55.750     / /  $56.750     / /  $57.750     / /  $58.750     / /  $59.750
/ /  $52.875     / /  $53.875     / /  $54.875     / /  $55.875     / /  $56.875     / /  $57.875     / /  $58.875     / /  $59.875
                                                                                                                       / /  $ 60.00
</TABLE>
 
                                    ODD LOTS
                              (SEE INSTRUCTION 6)
 
To be completed ONLY if Shares are being tendered by or on behalf of a person
owning beneficially, as of the close of business on August 24, 1994, an
aggregate of fewer than 100 Shares.

The undersigned either (check one box):

/ / was the beneficial owner, as of the close of business on August 24, 1994 of
    an aggregate of fewer than 100 Shares, all of which are being tendered; or

/ / is a broker, dealer, commercial bank, trust company, or other nominee which

   (a) is tendering, for the beneficial owners thereof, Shares with respect to
       which it is the record owner, and

   (b) believes, based upon representations made to it by such beneficial
       owners, that each such person was the beneficial owner as of the close of
       business on August 24, 1994, of an aggregate of fewer than 100 Shares and
       is tendering all of such Shares.
 
                                        5
<PAGE>   6
 
                          SPECIAL PAYMENT INSTRUCTIONS
 
                      (SEE INSTRUCTIONS 1, 4, 7, 8 AND 9)
 
     To be completed ONLY if the check for the purchase price of Shares
purchased (less the amount of any federal income and backup withholding tax
required to be withheld) or certificates for Shares not tendered or not
purchased are to be issued in the name of someone other than the undersigned, or
if Shares delivered by book-entry transfer that are not purchased are to be
returned by credit to an account maintained by a Book-Entry Transfer Facility.
 
Issue  / / Check  / / Certificate(s) to:
 
Name ...........................................................................
                                 (PLEASE PRINT)
 
Address ........................................................................
 
................................................................................
                                   (ZIP CODE)
 
................................................................................
                         (TAXPAYER IDENTIFICATION NO.)
 
/ / Credit unpurchased Shares tendered by book-entry transfer and not purchased
    to the account set forth below:
 
Name of Account Party ..........................................................

Account Number ...............................................................at

/ / DTC                           / / MSTC                          / / PHILADEP
 

                         SPECIAL DELIVERY INSTRUCTIONS
 
                      (SEE INSTRUCTIONS 1, 4, 7, 8 AND 9)
 
     To be completed ONLY if the check for the purchase price of Shares
purchased (less the amount of any federal income and backup withholding tax
required to be withheld) or certificates for Shares not tendered or not
purchased are to be mailed to someone other than the undersigned or to the
undersigned at an address other than that shown below the undersigned's
signature(s).
 
Deliver  / / Check  / / Certificate(s) to:
 
Name ...........................................................................
                                 (PLEASE PRINT)
 
Address ........................................................................
 
................................................................................
                                   (ZIP CODE)
 
                                        6
<PAGE>   7
 
                                   SIGN HERE
 
                 (COMPLETE SUBSTITUTE FORM W-9 ON REVERSE SIDE)
 
............................................................................
 
............................................................................
                            SIGNATURE(S) OF OWNER(S)
 
Name(s) ....................................................................
                                 (PLEASE PRINT)
 
............................................................................
 
Capacity (full title) ......................................................
 
Address  ...................................................................
 
............................................................................
 
............................................................................
                               (INCLUDE ZIP CODE)

Area Code and Telephone Number  ............................................

Dated ......................................................... 199 ........

Taxpayer ID No. or Social Security No.  ....................................
 
(Must be signed by registered holder(s) exactly as name(s) appear(s) on stock
certificate(s) or on a security position listing or by person(s) authorized to
become registered holder(s) by certificates and documents transmitted herewith.
If signature is by a trustee, executor, administrator, guardian,
attorney-in-fact, agent, officer of a corporation or other person acting in a
fiduciary or representative capacity, please set for full title and see
Instruction 7.)
 
                           GUARANTEE OF SIGNATURE(S)
                    (IF REQUIRED; SEE INSTRUCTIONS 1 AND 7)

Name of Firm  ..............................................................

Authorized Signature  ......................................................

Dated ......................................................... 199 ........
 
                                        7
<PAGE>   8
 
<TABLE>
                                      PAYER'S NAME:  THE FIRST NATIONAL BANK OF BOSTON
- ------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                                                  <C>          <C>
                                  Enter your identification number in the                 Social Security Number OR
                                  appropriate box. For most individuals, this          Employer Identification Number
                                  is your social security number. If you do not                        
                                  have a number, see How to Obtain a TIN in the
                                  enclosed GUIDELINES                                  ______________________________
 
  SUBSTITUTE
                                  --------------------------------------------------------------------------------------------
                                  NOTE:  If the account is in more than one name, see the chart on page 2 of enclosed
                                  Guidelines for guidelines on which number to give the payer.
  FORM W-9
                                  --------------------------------------------------------------------------------------------
 
  DEPARTMENT OF THE TREASURY,
  INTERNAL REVENUE SERVICE        Certificate:  Under penalties of perjury, I certify that:

                                  (1) The number shown on this form is my correct Taxpayer
                                      Identification Number (or I am waiting for a number to be 
                                      issued to me), and
 
  PAYER'S REQUEST
  FOR TAXPAYER                    (2) I am not subject to backup withholding either because I have  FOR PAYEES EXEMPT
  IDENTIFICATION NO.                  not been notified by the Internal Revenue Service ("IRS")     FROM BACKUP WITH-
                                      that I am subject to backup withholding as a result of a      HOLDING (SEE ENCLOSED
                                      failure to report all interest or dividends, or the IRS has   GUIDELINES)
                                      notified me that I am no longer subject to backup 
                                      withholding.

                                  SIGNATURE ______________________________________________________

                                  DATE ___________________________________________________, 199___
- ------------------------------------------------------------------------------------------------------------------------------
<FN> 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE 
      OFFER. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR 
      ADDITIONAL DETAILS.
</TABLE>
 
                                                               8
<PAGE>   9
 
                                     INSTRUCTIONS
                FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
     1.  Guarantee of Signatures.  Except as otherwise provided below, all
signatures on this Letter of Transmittal must be guaranteed by a financial
institution (including most banks, savings and loan associations and brokerage
houses) which is a participant in the Securities Transfer Agents Medallion
Program, the New York Stock Exchange Medallion Program (an "Eligible
Institution"). Signatures on this Letter of Transmittal need not be guaranteed
(a) if this Letter of Transmittal is signed by the registered holder(s) of the
Shares (which term, for purposes of this document, shall include any participant
in one of the Book-Entry Transfer Facilities whose name appears on a security
position listing as the owner of Shares) tendered herewith and such holder(s)
have not completed either the box entitled "Special Payment Instructions" or the
box entitled "Special Delivery Instructions" on this Letter of Transmittal or
(b) if such Shares are tendered for the account of an Eligible Institution. See
Instruction 7.
 
     2.  Delivery of Letter of Transmittal and Shares; Guaranteed Delivery
Procedure.  This Letter of Transmittal is to be used only if certificates are to
be forwarded herewith unless an Agent's Message is utilized or if delivery of
Shares is to be made by book-entry transfer pursuant to the procedures set forth
in Section 3 of the Offer to Purchase. For a stockholder to validly tender
Shares, certificates for all physically delivered Shares, or a confirmation of a
book-entry transfer of all Shares delivered electronically into the Depositary's
account at one of the Book-Entry Transfer Facilities, as well as a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) and any
other documents required by this Letter of Transmittal, must be received by the
Depositary at one of its addresses set forth on the front page of this Letter of
Transmittal by the Expiration Date.
 
     Stockholders who cannot deliver their Shares and all other required
documents to the Depositary by the Expiration Date must tender their Shares
pursuant to the guaranteed delivery procedure set forth in Section 3 of the
Offer to Purchase. Pursuant to such procedure: (a) such tender must be made by
or through an Eligible Institution, (b) a properly completed and duly executed
Notice of Guaranteed Delivery substantially in the form provided by the
Purchaser must be received by the Depositary by the Expiration Date, and (c) the
certificates for all physically delivered Shares, or a confirmation of a
book-entry transfer of all Shares delivered electronically into the Depositary's
account at one of the Book-Entry Transfer Facilities, as well as a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) or, in
the case of a book-entry delivery, an Agent's Message and any other documents
required by this Letter of Transmittal, must be received by the Depositary
within five New York Stock Exchange, Inc. trading days after the date of
execution of such Notice of Guaranteed Delivery, all as provided in Section 3 of
the Offer to Purchase.
 
     THE METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING SHARE CERTIFICATES, IS
AT THE OPTION AND RISK OF THE TENDERING STOCKHOLDER. IF DELIVERY IS BY MAIL,
REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS RECOMMENDED.
 
     No alternative, conditional or contingent tenders will be accepted, and no
fractional Shares will be purchased. By executing this Letter of Transmittal (or
facsimile thereof), the tendering stockholder waives any right to receive any
notice of the acceptance for payment of the Shares.
 
     3.  Inadequate Space.  If the space provided in the box captioned
"Description of Shares Tendered" is inadequate, the certificate members and/or
the number of Shares should be listed on a separate signed schedule attached
hereto.
 
     4.  Partial Tenders (not applicable to stockholders who tender by
book-entry transfer).  If fewer than all the Shares represented by any
certificate delivered to the Depositary are to be tendered, fill in the number
of Shares which are to be tendered in the box entitled "Number of Shares
Tendered". In such case, a new certificate for the remainder of the Shares
represented by the old certificate will be sent to the person(s) signing this
Letter of Transmittal, unless otherwise provided in the appropriate box on this
Letter of Transmittal, as promptly as practicable after the expiration or
termination of the Offer. All Shares represented by certificates delivered to
the Depositary will be deemed to have been tendered unless otherwise indicated.
 
     5.  Indication of Price at Which Shares Are Being Tendered.  For Shares to
be properly tendered, the stockholder must check either the box indicating the
price per Share at which Shares are being tendered under
 
                                        9
<PAGE>   10
 
"Shares Tendered at Price Determined by Stockholder" or the box under "Shares
Tendered at Price Determined by Dutch Auction".
 
     By checking the box under "Shares Tendered at Price Determined by Dutch
Auction", the stockholder agrees to accept the Purchase Price that results from
the Dutch Auction tender process, which may be as low as $52.00 or as high as
$60.00 per Share. Checking the box under "Shares Tendered at Price Determined by
Stockholder" can result in none of the Shares being purchased if the Purchase
Price for the Shares is less than the price checked.
 
     ONLY ONE BOX MAY BE CHECKED.  If more than one box is checked, or if no box
is checked, Shares will not be deemed tendered. A stockholder wishing to tender
portions of his holdings at different prices must complete a separate Letter of
Transmittal for such price at which each such portion of Shares is tendered. The
same Shares cannot be tendered at more than one price unless previously
withdrawn as provided in Section 4 of the Offer to Purchase and retendered.
 
     6.  Odd Lots.  As described in Section 2 of the Offer to Purchase, if the
Company purchases less than all Shares tendered before the Expiration Date and
not withdrawn, the Shares purchased first will consist of all Shares tendered by
any stockholder who owned beneficially, as of the close of business on August
24, 1994, an aggregate of fewer than 100 Shares and who tenders all such Shares
at or below the Purchase Price. This preference will not be available unless the
box captioned "Odd Lots" it completed.
 
     7.  Signatures on Letter of Transmittal; Stock Powers and Endorsements.  If
this Letter of Transmittal is signed by the registered holder(s) of the Shares
tendered hereby, the signature(s) must correspond with the name(s) as written on
the face of the certificates without any change whatsoever.
 
     If any of the Shares tendered hereby are held of record by two or more
persons, all such persons must sign this Letter of Transmittal.
 
     If any of the Shares tendered hereby are registered in different names on
different certificates, it will be necessary to complete, sign and submit as
many separate Letters of Transmittal as there are different registrations of
certificates.
 
     If this Letter of Transmittal is signed by the registered holder(s) of the
Shares tendered hereby, no endorsement of certificates or separate stock powers
are required unless payment of the Purchase Price is to be made, or Shares not
tendered or not purchased are to be returned, in the name of any person other
than the registered holder(s). Signatures on any such certificates or stock
powers must be guaranteed by an Eligible Institution. If this Letter of
Transmittal is signed by a person other than the registered holder(s) of the
Shares tendered hereby, certificates must be endorsed or accompanied by
appropriate stock powers, in either case, signed exactly as the name(s) of the
registered holder(s) appear(s) on the certificates for such Shares. Signature(s)
on any such certificates or stock powers must be guaranteed by an Eligible
Institution. See Instruction 1.
 
     If this Letter of Transmittal or any certificate or stock power is signed
by a trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
such person should so indicate when signing, and proper evidence satisfactory to
the Purchaser of the authority of such person so to act must be submitted.
 
     8. Stock Transfer Taxes.  Except as provided in this Instruction, the
Company will pay any stock transfer taxes with respect to the sale and transfer
of any Shares to it or its order pursuant to the Offer. If, however, payment of
the Purchase Price is to be made to, or Shares not tendered or not purchased are
to be returned, in the name of any person other than the registered holder(s),
or tendered Shares are registered in the name of a person other than the name of
the person(s) signing this Letter of Transmittal, and the amount of any stock
transfer taxes (whether imposed on the registered holder(s), such other person
or otherwise) payable on account of the transfer to such person will be deducted
from the Purchase Price unless satisfactory evidence of the payment of such
taxes, or exemption therefrom is submitted.
 
     9.  Special Payment and Delivery Instructions.  If the check for the
Purchase Price of any Shares purchased is to be issued, or any Shares not
tendered or not purchased are to be returned, in the name of a person other than
the person(s) signing this Letter of Transmittal or if the check or any
certificates for Shares not tendered or not purchased are to be mailed to
someone other than the person(s) signing this Letter of
 
                                       10
<PAGE>   11
 
Transmittal or to the person(s) signing this Letter of Transmittal at an address
other than that shown above, the appropriate boxes on this Letter of Transmittal
should be completed. Stockholders tendering Shares by book-entry transfer may
request that Shares not purchased be credited to such account at any of the
Book-Entry Transfer Facilities as such stockholder may designate under "Special
Payment Instructions".
 
     10.  Federal Income Tax Withholding.  Under federal income tax laws, the
Depositary is required to withhold 31% of the amount of any payments made
pursuant to the Offer unless certain requirements are satisfied. In order to
avoid such withholding, a tendering stockholder must complete the Substitute
Form W-9 set forth above and return it to the Depositary, unless the shareholder
is an "exempt recipient," (including, among others, all corporations and certain
foreign individuals). In order to satisfy the Depositary that a foreign
individual qualifies as an exempt recipient, such stockholder must submit a
statement, signed under penalties of perjury, attesting to that individual's
exempt status. Such statements can be obtained from the Depositary. For further
information concerning backup withholding and instructions for completing the
Substitute Form W-9 (including how to obtain a taxpayer identification number if
you do not have one and how to complete the Substitute Form W-9 if Shares are
held in more than one name), consult the enclosed Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9. If the Depositary is
not provided with the correct taxpayer identification number and the tendering
shareholder is not an exempt recipient, the stockholder may be subject to a $50
penalty imposed by the Internal Revenue Service and payments that are made to
such stockholder pursuant to the Offer may be subject to backup withholding.
 
     Failure to complete the Substitute Form W-9 will not, by itself, cause
Shares to be deemed invalidly tendered, but may require the Depositary to
withhold 31% of the amount of any payments made pursuant to the Offer. Backup
withholding is not an additional federal income tax. Rather, the federal income
tax liability of a person subject to backup withholding will be reduced by the
amount of tax withheld. If withholding results in an overpayment of taxes, a
refund may be obtained.
 
     Except to the extent that payments made to noncorporate shareholders
pursuant to the Offer qualify for partial liquidation treatment, as described in
Section 13 of the Offer to Purchase, the Company will treat the gross proceeds
payable pursuant to the Offer as a dividend for federal income tax purposes, and
if neither a reduced rate of withholding is applicable pursuant to a tax treaty
nor an exemption from withholding is applicable because gross proceeds paid
pursuant to the Offer are effectively connected with the conduct of a trade or
business within the United States, the Company will be required to withhold
federal income tax at a rate of 30% from such gross proceeds paid to a foreign
stockholder or his agent. For this purpose, a foreign stockholder is any
stockholder that is not (i) a citizen or resident of the United States, (ii) a
corporation, partnership or other entity created or organized in or under the
laws of the United States, or (iii) any estate or trust the income of which is
subject to United States federal income taxation regardless of its source. The
Company will determine the applicable rate of withholding by reference to a
stockholder's address, except if facts and circumstances indicate such reliance
is not warranted or if applicable law (for example, an applicable tax treaty or
Treasury regulations thereunder) requires some other method for determining a
stockholder's residence. A foreign stockholder may be eligible to file for a
refund of such tax or a portion of such tax if the proceeds payable pursuant to
the Offer are entitled to sale or exchange treatment as described in Section 13
of the Offer to Purchase or if the stockholder is entitled to a reduced rate of
withholding pursuant to a treaty and the Company withheld at a higher rate. In
order to claim an exemption from withholding on the grounds that gross proceeds
paid pursuant to the Offer are effectively connected with the conduct of a trade
or business within the United States, a foreign stockholder must deliver to the
Depositary a properly executed Form 4224 claiming such exemption. Such Forms can
be obtained from the Depositary. Foreign stockholders are urged to consult their
own tax advisors regarding the application of federal income tax withholding,
including eligibility for a withholding tax reduction or exemption and the
refund procedure.
 
     11.  Irregularities.  All questions as to the Purchase Price, number of
Shares accepted, the form of documents, and the validity, eligibility (including
time of receipt) and acceptance for payment of any tender of Shares will be
determined by the Company in its sole discretion, which determination shall be
final and binding on all parties. The Company reserves the absolute right to
reject any or all tenders of Shares it determines not to be in proper form or
the acceptance of which or payment for which may, in the opinion of the
Company's counsel, be unlawful. The Company also reserves the absolute right to
waive any of the conditions of the Offer and any defect or irregularity in the
tender of any particular Shares, and the Company's interpretations of the terms
of the Offer (including these instructions) will be final and binding on all
parties.
 
                                       11
<PAGE>   12
 
No tender of Shares will be deemed to be properly made until all defects and
irregularities have been cured or waived. Unless waived, any defects or
irregularities in connection with tenders must be cured within such time as the
Company shall determine. None of the Company, the Dealer Manager, the
Depositary, the Information Agent (as the foregoing are defined in the Offer to
Purchase) or any other person is or will be obligated to give notice of any
defects or irregularities in tenders and none of them will incur any liability
for failure to give any such notice.
 
     12.  Requests for Assistance or Additional Copies.  Questions and requests
for assistance or additional copies of the Offer to Purchase and this Letter of
Transmittal should be directed to the Information Agent and the Dealer Manager
at their respective addresses and telephone numbers set forth below.
 
     13.  Employee Benefit Plans.  Participants in the Savings Plus Plan who
wish to have the Plan trustees tender Shares attributable to their accounts
should so indicate by completing, executing and returning the "Tender
Instruction Form" included in the notice sent to such Savings Plus Plan
participants. A participant in the Savings Plus Plan may direct the tender of
all, excluding fractional Shares, or a part of any Shares held in his account.
If a participant's Savings Plus Plan Shares are purchased pursuant to the Offer,
the number of Savings Plus Plan Shares allocated to the participant's Savings
Plus Plan account will be reduced by the number of such participant's Savings
Plus Plan Shares so purchased. Any Savings Plus Plan Shares tendered but not
purchased will be returned to the participant's Savings Plus Plan account. For
further information regarding the Offer and its effect on the Savings Plus Plan
Shares, see the accompanying letter from the Company entitled "Questions and
Answers on Savings Plus Plan Tender Rights and Procedures."
 
     Participants in the Option Plan may elect to make a conditional exercise
and tender of vested options and receive a cash payment, less any applicable tax
withholding, equal to the difference between the Purchase Price and the exercise
price. A participant electing this procedure should so indicate by completing,
executing and returning the "Stock Option Tender Instruction Form" included in
the notice sent to such Option Plan participants. A participant in the Option
Plan may direct the tender of all or any part of the Shares which would have
been received upon the exercise of vested options. Any option exercised but as
to which the underlying Shares are not purchased in the Offer will be deemed not
to have been exercised and will be returned to the employee stockholder.
Alternatively, a participant may at any time exercise and tender vested options
in accordance with the terms of the Option Plan, pay the cash exercise price and
receive Shares which may be tendered in the Offer by following the instructions
set forth in the Offer to Purchase and this Letter of Transmittal.
 
     PARTICIPANTS IN THE EMPLOYEE PLANS MAY NOT USE THIS LETTER OF TRANSMITTAL
TO DIRECT THE TENDER OF THE SHARES ATTRIBUTABLE TO THE PARTICIPANT'S ACCOUNT,
BUT MUST USE THE SEPARATE "TENDER INSTRUCTION FORMS" SENT TO THEM. PARTICIPANTS
IN THE EMPLOYEE PLANS ARE URGED TO READ THE SEPARATE "TENDER INSTRUCTION FORMS"
AND RELATED MATERIALS CAREFULLY.
 
                    The Information Agent for the Offer is:
                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                           (800) 488-8095 (toll free)
 
                      The Dealer Manager for the Offer is:
                          J.P. MORGAN SECURITIES INC.
                                 60 Wall Street
                         New York, New York 10260-0060
                                 (212) 648-7078
                                 (call collect)
 
                                       12
<PAGE>   13
 
- --------------------------------------------------------------------------------
                        GUIDELINES FOR CERTIFICATION OF
                         TAXPAYER IDENTIFICATION NUMBER
                             ON SUBSTITUTE FORM W-9
 
IRS INSTRUCTIONS
 
(SECTION REFERENCES ARE TO THE INTERNAL REVENUE CODE.)
 
Purpose of Form. - A person who is required to file an information return with
the Internal Revenue Service (the IRS) must obtain your correct taxpayer
identification number (TIN) to report income paid to you, real-estate
transactions, mortgage interest you paid, the acquisition or abandonment of
secured property, or contributions you made to an individual retirement account
(IRA). Use Form W-9 to furnish your correct TIN to the requester (the person
asking you to furnish your TIN), and, when applicable, (1) to certify that the
TIN you are furnishing is correct (or that you are waiting for a number to be
issued), (2) to certify that you are not subject to backup withholding, and (3)
to claim exemption from backup withholding if you are an exempt payee.
Furnishing your correct TIN and making the appropriate certifications will
prevent certain payments from being subject to backup withholding.
 
Note: IF A REQUESTER GIVES YOU A FORM OTHER THAN A W-9 TO REQUEST YOUR TIN, YOU
MUST USE THE REQUESTER'S FORM.
 
How to Obtain a TIN. - If you do not have a TIN, apply for one immediately. To
apply, get FORM SS-5, Application for a Social Security Card (SSN) (for
individuals), from your local office of the Social Security Administration, or
FORM SS-4, Application for Employer Identification Number (EIN) (for businesses
and all other entities), from your local IRS office.
 
  To complete Form W-9, If you do not have a TIN, write "Applied for" in the
space for the TIN in Part 1, sign and date the form, and give it to the
requester. Generally, you will then have 60 days to obtain a TIN and furnish it
to the requester. If the requester does not receive your TIN within 60 days,
backup withholding, if applicable, will begin and continue until you furnish
your TIN to the requester. For reportable interest or dividend payments, the
payer must exercise one of the following options concerning backup withholding
during this 60-day period. Under option (1), a payer must backup withhold on any
withdrawals you make from your account after 7 business days after the requester
receives this form back from you. Under option (2), the payer must backup
withhold on any reportable interest or dividend payments made to your account,
regardless of whether you make any withdrawals. The backup withholding under
option (2) must begin no later than 7 business days after the requester receives
this form back. Under option (2), the payer is required to refund the amounts
withheld if your certified TIN is received within the 60-day period and you were
not subject to backup withholding during the period.
 
Note: WRITING "APPLIED FOR" ON THE FORM MEANS THAT YOU HAVE ALREADY APPLIED FOR
A TIN OR THAT YOU INTEND TO APPLY FOR ONE IN THE NEAR FUTURE.
 
As soon as you receive your TIN, complete another Form W-9, include your TIN,
sign and date this form, and give it to the requester.
 
What is Backup Withholding? - Persons making certain payments to you after 1992
are required to withhold and pay to the IRS 31% of such payments under certain
conditions. This is called "backup withholding." Payments that could be subject
to backup withholding include interest, dividends, broker and barter exchange
transactions, rents, royalties, nonemployee compensation, and certain payments
from fishing boat operators, but do not include real estate transactions.
 
  If you give the requester your correct TIN, make the appropriate
certifications, and report all your taxable interest and dividends on your tax
return, your payments will not be subject to backup withholding. Payments you
receive will be subject to backup withholding if:
 
  (1) You do not furnish your TIN to the requester, or
 
  (2) The IRS notifies the requester that you furnished an incorrect TIN, or
 
  (3) You are notified by the IRS that you are subject to backup withholding
because you failed to report all your interest and dividends on your tax return
(for reportable interest and dividends only), or
 
  (4) You fail to certify to the requester that you are not subject to backup
withholding under (3) above (for reportable interest and dividend accounts
opened after 1983 only), or
 
  (5) You fail to certify your TIN. This applies only to reportable interest,
dividend, broker, or barter exchange accounts opened after 1983, or broker
accounts considered inactive in 1983.
 
Except as explained in (5) above, other reportable payments are subject to
backup withholding only if (1) or (2) above applies. Certain payees and payments
are exempt from backup withholding and information reporting. See PAYEES AND
PAYMENTS EXEMPT FROM BACKUP WITHHOLDING, below, and EXEMPT PAYEES AND PAYMENTS
under SPECIFIC INSTRUCTIONS, on page 2, if you are an exempt payee.
 
Payees and Payments Exempt From Backup Withholding. - The following is a list of
payees exempt from backup withholding and for which no information reporting is
required. For interest and dividends, all listed payees are exempt except item
(9). For broker transactions, payees listed in (1) through (13) and a person
registered under the Investment Advisers Act of 1940 who regularly acts as a
broker are exempt. Payments subject to reporting under sections 6041 and 6041A
are generally exempt from backup withholding only if made to payees described in
items (1) through (7), except that a corporation that provides medical and
health care services or bills and collects payments for such services is not
exempt from backup withholding or information reporting. Only payees described
in items (2) through (6) are exempt from backup withholding for barter exchange
transactions, patronage dividends, and payments by certain fishing boat
operators.
 
  (1) A corporation.
 
  (2) An organization exempt from tax under section 501(a), or an IRA, or a
custodial account under section 403(b)(7).
 
  (3) The United States or any of its agencies or instrumentalities.
 
  (4) A state, the District of Columbia, a possession of the United States, or
any of their political subdivisions or instrumentalities.
 
  (5) A foreign government or any of its political subdivisions, agencies, or
instrumentalities.
 
  (6) An international organization or any of its agencies or instrumentalities.
 
  (7) A foreign central bank of issue.
 
  (8) A dealer in securities or commodities required to register in the U.S. or
a possession of the U.S.
 
  (9) A futures commission merchant registered with the Commodity Futures
Trading Commission.
 
 (10) A real estate investment trust.
 
 (11) An entity registered at all times during the tax year under the Investment
Company Act of 1940.
 
 (12) A common trust fund operated by a bank under section 584(a).
 
 (13) A financial institution.
 
 (14) A middleman known in the investment community as a nominee or listed in
the most recent publication of the American Society of Corporation Secretaries,
Inc., Nominee List.
 
 (15) A trust exempt from tax under section 664 or described in section 4947.
 
  Payments of dividends and patronage dividends generally not subject to backup
withholding also include the following:
 
- - Payments to nonresident aliens subject to withholding under section 1441.
 
- - Payments to partnerships not engaged in trade or business in the U.S. and that
have at least one nonresident partner.
 
- - Payments of patronage dividends not paid in money.
 
- - Payments made by certain foreign organizations.
 
Payments of interest generally not subject to backup withholding include the
following:
 
- - Payments of interest on obligations issued by individuals.
 
Note: YOU MAY BE SUBJECT TO BACKUP WITHHOLDING IF THIS INTEREST IS $600 OR MORE
AND IS PAID IN THE COURSE OF THE PAYER'S TRADE OR BUSINESS AND YOU HAVE NOT
PROVIDED YOUR CORRECT TIN TO THE PAYER.
 
- - Payments of tax-exempt interest (including exempt-interest dividends under
section 852).
 
- - Payments described in section 6049(b)(5) to nonresident aliens.
 
- - Payments on tax-free covenant bonds under section 1451.
 
- - Payments made by certain foreign organizations.
 
- - Mortgage interest paid by you.
 
  Payments that are not subject to information reporting are also not subject to
backup withholding. For details, see sections 6041, 6041A(a), 6042, 6044, 6045,
6049, 6050A, and 6050N, and their regulations.
 
                                     Page 1
<PAGE>   14
 
PENALTIES
 
Failure To Furnish TIN. - If you fail to furnish your correct TIN to a
requester, you are subject to a penalty of $50 for each such failure unless your
failure is due to reasonable cause and not to willful neglect.
 
Civil Penalty for False Information With Respect to Withholding. - If you make a
false statement with no reasonable basis that results in no backup withholding,
you are subject to a $500 penalty.
 
Criminal Penalty for Falsifying Information. - Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.
 
Misuse of TINs. - If the requestor discloses or uses TINs in violation of
federal law, the requestor may be subject to civil and criminal penalties.
 
SPECIFIC INSTRUCTIONS
 
Name. - If you are an individual, you must generally provide the name shown on
your social security card. However, if you have changed your last name, for
instance, due to marriage, without informing the Social Security Administration
of the name change, please enter your first name, the last name shown on your
social security card and your new last name.
 
  If you are a sole proprietor, you must furnish your individual name and either
your SSN or EIN. You may also enter your business name or "doing business as"
name on the business name line. Enter your name(s) as shown on your social
security card and/or as it was used to apply for your EIN on Form SS-4.
 
Signing the Certification. -
 
(1) Interest, Dividend, and Barter Exchange Accounts Opened Before 1984 and
Broker Accounts Considered Active During 1983. - You are required to furnish
your correct TIN, but you are not required to sign the certification.
 
(2) Interest, Dividend, Broker and Barter Exchange Accounts Opened After 1983
and Broker Accounts Considered Inactive During 1983. - You must sign the
certification or backup withholding will apply. If you are subject to backup
withholding and you are merely providing your correct TIN to the requester, you
must cross out item (2) in the certification before signing the form.
(3) Real Estate Transactions. - You must sign the certification. You may cross
out item (2) of the certification.
 
(4) Other Payments. - You are required to furnish your correct TIN, but you are
not required to sign the certification unless you have been notified of an
incorrect TIN. Other payments include payments made in the course of the
requester's trade or business for rents, royalties, goods (other than bills for
merchandise), medical and health care services, payments to a nonemployee for
services (including attorney and accounting fees), and payments to certain
fishing boat crew members.
 
(5) Mortgage Interest Paid by You, Acquisition or Abandonment of Secured
Property, or IRA Contributions. - You are required to furnish your correct TIN,
but you are not required to sign the certification.
 
(6) Exempt Payees and Payments. - If you are exempt from backup withholding, you
should complete this form to avoid possible erroneous backup withholding. Enter
your correct TIN in Part I, write "EXEMPT" in the block in Part II, sign and
date the form. If you are a nonresident alien or foreign entity not subject to
backup withholding, give the requester a completed FORM W-8. Certificate of
Foreign Status.
 
(7) TIN "Applied For". - Follow the instructions under HOW TO OBTAIN A TIN, on
page 1, check the box in Part II of the Substitute Form W-9 and sign and date
the form.
 
Signature. - For a joint account, only the person whose TIN is shown in Part I
should sign the form.
 
Privacy Act Notice. - Section 6109 requires you to furnish your correct TIN to
persons who must file information returns with the IRS to report interest,
dividends, and certain other income paid to you, mortgage interest you paid, the
acquisition or abandonment of secured property, or contributions you made to an
IRA. The IRS uses the numbers for identification purposes and to help verify the
accuracy of your tax return. You must provide your TIN whether or not you are
required to file a tax return. Payers must generally withhold 31% of taxable
interest, dividends, and certain other payments to a payee who does not furnish
a TIN to a payer. Certain penalties may also apply.
 
WHAT NAME AND NUMBER TO GIVE THE REQUESTER
 
<TABLE>
<S>                              <C>
- ------------------------------------------------------------------
                                 GIVE THE NAME AND
FOR THIS TYPE OF                  SOCIAL SECURITY
ACCOUNT:                          NUMBER OF:
- ------------------------------------------------------------------
 1. Individual                    The individual
 2. Two or more individuals       The actual owner of the account
    (joint account)               or, if combined funds, the first
                                  individual on the account(1)
 3. Custodian account of a minor  The minor (2)
    (Uniform Gift to Minors Act)
 4. a. The usual revocable        The grantor-trustee(1)
       savings trust (grantor is
       also trustee)
    b. So-called trust account     The actual owner(1)
       that is not a legal or
       valid trust under state law
 5. Sole proprietorship           The owner(3)
- ------------------------------------------------------------------
- ------------------------------------------------------------------
                                 GIVE THE NAME AND
FOR THIS TYPE OF                  EMPLOYER IDENTIFICATION
ACCOUNT:                          NUMBER OF:
- ------------------------------------------------------------------
 6. Sole proprietorship           The owner(3)
 7. A valid trust, estate or      Legal entity(4)
    pension trust
 8. Corporate                     The corporation
 9. a. Association, club,         The organization
       religious, charitable,
       educational, or other
       tax-exempt organization
10. Partnership                   The partnership
11. A broker or registered        The broker or nominee
    nominee
12. Account with the Department   The public entity
    of Agriculture in the name of
    a public entity (such as a
    state or local government,
    school district, or prison)
    that receives agricultural
    program payments
- ------------------------------------------------------------------
<FN>
 
(1) List first and circle the name of the person whose number you furnish.
 
(2) Circle the minor's name and furnish the minor's social security number.
 
(3) Show the individual's name. You may also enter your business name. You may
    use your SSN or EIN.
 
(4) List first and circle the name of the legal trust, estate, or pension trust.
    (Do not furnish the TIN of the personal representative or trustee unless the
    legal entity itself is not designated in the account title).

</TABLE>
 
NOTE:  IF NO NAME IS CIRCLED WHEN THERE IS MORE THAN ONE NAME, THE NUMBER WILL
BE CONSIDERED TO BE THAT OF THE FIRST NAME LISTED.
 
                                     Page 2

<PAGE>   1
  

                                                               EXHIBIT (a)(7)


 
                         NOTICE OF GUARANTEED DELIVERY
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
                        TO TENDER SHARES OF COMMON STOCK
                (INCLUDING THE ASSOCIATED STOCK PURCHASE RIGHTS)
 
                                       OF
 
                             MILLIPORE CORPORATION
            PURSUANT TO ITS OFFER TO PURCHASE DATED AUGUST 25, 1994
 
     The attached form, or a form substantially equivalent to the attached form,
must be used to accept the Offer (as defined below) if certificates for shares
of Common Stock of Millipore Corporation and all other documents required by the
Letter of Transmittal cannot be delivered to the Depositary by the expiration of
the Offer. Such form may be delivered by hand, facsimile transmission, or mailed
to the Depositary. See Section 3 of the Offer to Purchase.

               TO: THE FIRST NATIONAL BANK OF BOSTON, DEPOSITARY
 
<TABLE>
<S>                                    <C>                <C>
              By Mail:                                                  By Hand:
 The First National Bank of Boston                              BancBoston Trust Company
   Shareholder Services Division                                      of New York
           P.O. Box 1889                                        55 Broadway, Third Floor
         Mail Stop 45-01-19                                        New York, New York
    Boston, Massachusetts 02105

     By Facsimile Transmission:           Telephone:             By Overnight Courier:
           (617) 575-2232               (617) 575-2700     The First National Bank of Boston
           (617) 575-2233                                    Shareholder Services Division
  (for Eligible Institutions Only)                                 Mail Stop 45-01-19
        Confirm by Telephone                                       150 Royall Street
                                                              Canton, Massachusetts 02021
</TABLE>
 
     Delivery of this Notice of Guaranteed Delivery to an address other than
those shown above or transmission of instructions via a facsimile number other
than those listed above does not constitute a valid delivery.
 
     FOR THIS NOTICE OF GUARANTEED DELIVERY TO BE EFFECTIVE, IT MUST BE SIGNED
BY BOTH THE TENDERING SHAREHOLDER AND THE GUARANTOR.
<PAGE>   2
 
     THIS FORM IS NOT TO BE USED TO GUARANTEE SIGNATURES. IF A SIGNATURE ON A
LETTER OF TRANSMITTAL IS REQUIRED TO BE GUARANTEED BY AN "ELIGIBLE INSTITUTION"
UNDER THE INSTRUCTIONS THERETO, SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE
APPLICABLE SPACE PROVIDED IN THAT SIGNATURE BOX ON THE LETTER OF TRANSMITTAL.
 
Gentlemen:
 
     The undersigned hereby tenders to Millipore Corporation (the "Company"), at
the price per Share indicated below, net to seller in cash, upon the terms and
subject to the conditions set forth in the Offer to Purchase dated August 25,
1994 (the "Offer to Purchase") and the related Letter of Transmittal (which
together constitute the "Offer"), receipt of which is hereby acknowledged, the
number (indicate below) of shares of Common Stock, $1.00 par value per share
(such shares, together with all other outstanding shares of Common Stock of the
Company, including the associated stock purchase rights (the "Rights") issued
pursuant to the Shareholder Rights Agreement dated as of April 15, 1988 between
the Company and The First National Bank of Boston, as Rights Agent, are herein
referred to as the "Shares") of the Company, pursuant to the guaranteed delivery
procedure set forth in Section 3 of the Offer to Purchase.
 
NUMBER OF SHARES BEING TENDERED HEREBY:
- ---------------
 
                        PRICE (IN DOLLARS) PER SHARE AT
                        WHICH SHARES ARE BEING TENDERED
- --------------------------------------------------------------------------------
 
                              CHECK ONLY ONE BOX.
                     IF MORE THAN ONE BOX IS CHECKED, OR IF
                      NO BOX IS CHECKED, THERE IS NO VALID
                               TENDER OF SHARES.
 
                            SHARES TENDERED AT PRICE
                          DETERMINED BY DUTCH AUCTION
 
/ / The undersigned wants to maximize the chance of having the Company purchase
    all the Shares the undersigned is tendering (subject to the possibility of
    proration). Accordingly, by checking this one box INSTEAD OF ONE OF THE
    PRICE BOXES BELOW, the undersigned hereby tenders Shares and is willing to
    accept the Purchase Price resulting from the Dutch auction tender process.
    This action could result in receiving a price per Share as low as $52.00 or
    as high as $60.00.
 
                                         OR
 
                              SHARES TENDERED AT PRICE
                             DETERMINED BY STOCKHOLDER
 
<TABLE>
<S>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>
/ /  $ 52.00     / /  $ 53.00     / /  $ 54.00     / /  $ 55.00     / /  $ 56.00     / /  $ 57.00     / /  $ 58.00     / /  $ 59.00
/ /  $52.125     / /  $53.125     / /  $54.125     / /  $55.125     / /  $56.125     / /  $57.125     / /  $58.125     / /  $59.125
/ /  $52.250     / /  $53.250     / /  $54.250     / /  $55.250     / /  $56.250     / /  $57.250     / /  $58.250     / /  $59.250
/ /  $52.375     / /  $53.375     / /  $54.375     / /  $55.375     / /  $56.375     / /  $57.375     / /  $58.375     / /  $59.375
/ /  $52.500     / /  $53.500     / /  $54.500     / /  $55.500     / /  $56.500     / /  $57.500     / /  $58.500     / /  $59.500
/ /  $52.625     / /  $53.625     / /  $54.625     / /  $55.625     / /  $56.625     / /  $57.625     / /  $58.625     / /  $59.625
/ /  $52.750     / /  $53.750     / /  $54.750     / /  $55.750     / /  $56.750     / /  $57.750     / /  $58.750     / /  $59.750
/ /  $52.875     / /  $53.875     / /  $54.875     / /  $55.875     / /  $56.875     / /  $57.875     / /  $58.875     / /  $59.875
                                                                                                                       / /  $ 60.00
</TABLE>
 
                                        2
<PAGE>   3
 
         ------------------------------------------------------------
                                    ODD LOTS
                (SEE INSTRUCTION 6 OF THE LETTER OF TRANSMITTAL)
 
           The undersigned either (check one box):
 
           / / was the beneficial owner as of the close of business
               on August 24, 1994 of an aggregate of fewer than 100
               Shares, all of which are being tendered, or
 
           / / is a broker, dealer, commercial bank, trust company or
               other nominee that (i) is tendering, for the
               beneficial owners thereof, Shares with respect to
               which it is the record owner, and (ii) believes, based
               upon representations made to it by each such
               beneficial owner, that such beneficial owner owned
               beneficially as of the close of business on August 24,
               1994 an aggregate of fewer than 100 Shares, and is
               tendering all of such Shares.
- -------------------------------------------------------------------------------

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

Number of Shares:...............................................................
 
Certificate Nos. (if available):
 
 ...............................................................................
 
 ...............................................................................
If Shares will be tendered by book-entry transfer:
 
Name of Tendering
Institution:....................................................................
 
 ...............................................................................
 
Account No. at..................................................................
 
/ / The Depository Trust Company
/ / Midwest Securities Trust Company
/ / Philadelphia Depository Trust Company
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 
                                   SIGN HERE
 
 ...............................................................................
 
 ...............................................................................
                                  SIGNATURE(S)
 
Dated: ..................................................................., 1994
 
Name(s) of Stockholders:
 
...............................................................................
 
...............................................................................
                              PLEASE TYPE OR PRINT

...............................................................................
                                    ADDRESS

..............................................................................
                                    ZIP CODE

..............................................................................
                          AREA CODE AND TELEPHONE NO.

..............................................................................
                     TAXPAYER ID NO. OR SOCIAL SECURITY NO.

- --------------------------------------------------------------------------------
                                        3
<PAGE>   4
 
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
     The undersigned, a firm that is a member of a registered national
securities exchange or the National Association of Securities Dealers, Inc., or
a commercial bank or trust company having an office, branch or agency in the
United States, guarantees (a) that the above named person(s) "own(s)" the Shares
and associated Rights tendered hereby within the meaning of Rule 14e-4 under the
Securities Exchange Act of 1934, as amended, (b) that such tender of Shares
complies with Rule 14e-4 and (c) to deliver to the Depositary the Shares
tendered hereby, together with a properly completed and duly executed Letter(s)
of Transmittal (or facsimile(s) thereof) or an Agent's Message (as defined in
the Offer to Purchase) and any other required documents, all within five New
York Stock Exchange, Inc. trading days of the date hereof.
 
                                            ....................................
                                                        NAME OF FIRM
 
                                            ....................................
                                                    AUTHORIZED SIGNATURE

                                            ....................................
                                                            NAME

                                            ....................................
                                                          ADDRESS

                                            ....................................
                                                          ZIP CODE

Dated:........................, 1994        ....................................
                                                AREA CODE AND TELEPHONE NO.
 
           DO NOT SEND STOCK CERTIFICATES WITH THIS FORM. YOUR STOCK
           CERTIFICATES MUST BE SENT WITH THE LETTER OF TRANSMITTAL.
 
                                        4

<PAGE>   1
                                                                 EXHIBIT (a)(8)


This announcement is neither an offer to purchase nor a solicitation of an      
offer to sell these securities. The offer is made solely by the Offer to 
Purchase dated August 25, 1994 and the related Letter of Transmittal which are
being mailed to holders of Common Stock of Millipore Corporation and is not
being made to, and tenders will not be accepted from or on behalf of holders
of Common Stock in any jurisdiction in which the making or acceptance thereof
would not be in compliance with the laws of such jurisdiction.

                               Notice of Offer
                                      by
                            Millipore Corporation
                             to Purchase for Cash
                  Up to 3,500,000 Shares of its Common Stock
               (Including the Associated Stock Purchase Rights)
                      At a Price of Not More Than $60.00
                        Nor Less Than $52.00 Per Share

Millipore Corporation, a Massachusetts corporation (the "Company"), is  
offering to purchase for cash up to 3,500,000 shares of its Common Stock, par 
value $1.00 per share (such shares, together with all other outstanding shares
of Common Stock of the Company, including the associated stock purchase rights
(the "Rights") issued pursuant to the Shareholder Rights Agreement dated as of
April 15, 1988 between the Company and The First National Bank of Boston, as
Rights Agent, are herein referred to as the "Shares"), upon the terms and
subject to the conditions set forth in the Offer to Purchase dated August 25,
1994 and in the related Letter of Transmittal (which together constitute the
"Offer").

The Company is inviting its shareholders to tender shares of its Common Stock 
at prices specified by such shareholders, not more than $60.00 nor less than    
$52.00 per Share, upon the terms and subject to the conditions set forth in 
the Offer. Based upon the number of Shares tendered and the prices specified 
by tendering shareholders, the Company will select a single purchase price 
(the "Purchase Price") which will be not more than $60.00 nor less than $52.00
per Share that it will pay for Shares properly tendered and not withdrawn
pursuant to the Offer. The Company will select a single per share price which
will enable it to purchase 3,500,000 Shares (or such lesser number of Shares
as is properly tendered at prices not greater than $60.00 nor less than $52.00
per Share) pursuant to the Offer. All Shares tendered at or below the Purchase
Price will be purchased at the Purchase Price, subject to the terms and
conditions of the Offer, including the proration and Odd Lot provisions
described herein. The Purchase Price will be paid in cash, net to the seller,
with respect to all shares purchased. Shares tendered at prices in excess of
the Purchase Price and Shares not purchased because of proration will be
returned. Tendering shareholders will not be obligated to pay brokerage
commissions, solicitation fees or, subject to the Instruction 8 of the Letter
of Transmittal, stock transfer taxes on the purchase of Shares by the Company.
However, if the number of Shares validly tendered at or below the Purchase
Price prior to the Termination Date (the "Eligible Shares") exceeds the number
of Shares to be purchased, then the Company will select the Shares to be
purchased from the Eligible Shares on a pro rata basis after purchase of Odd
Lots (as defined below). The Offer will expire at 12:00 Midnight, Boston time,
on Thursday, September 22, 1994, unless the Company exercises its right, in
its sole discretion, to extend the Offer at any time or from time to time by
oral or written notice to the Depositary. The Company reserves the right, in
its sole discretion, to purchase up to an additional 2% of the outstanding
Shares pursuant to the Offer.

<PAGE>   2

The Offer is not conditioned upon any minimum number of shares being tendered. 
The Offer is, however, subject to certain other conditions expressed in Section
6 of the Offer to Purchase.

THE WITHDRAWAL DEADLINE AND EXPIRATION DATE (UNLESS EXTENDED) ARE BOTH 12:00 
MIDNIGHT, BOSTON TIME, ON THURSDAY, SEPTEMBER 22, 1994.

Upon the terms and subject to the conditions of the Offer, in the event that 
prior to the Expiration Date a greater number of Shares is properly tendered, 
and not withdrawn, at prices at or below the Purchase Price than will be        
accepted for purchase by the Company, the Company will accept the Shares to be
purchased in the following order of priority: first, Odd Lots; then, the 
remaining Shares on a pro rata basis (with appropriate adjustments to avoid 
purchases of fractional Shares). For the purposes of the Offer, "Odd Lots" 
means all Shares validly tendered prior to the Termination Date by any person 
who owned, beneficially or of record as of August 24, 1994, an aggregate of 
fewer than 100 Shares and who tenders all such Shares and completes the box 
captioned "Odd Lots" in the Letter of Transmittal and, if applicable, the 
Notice of Guaranteed Delivery.

Tenders made pursuant to the Offer will be irrevocable, except that Shares 
tendered may be withdrawn prior to the Withdrawal Deadline, which is 12:00      
Midnight, Boston time, on Thursday, September 22, 1994, unless and until the 
Company shall have fixed a later date prior to which Shares tendered may be 
withdrawn, in which case "Withdrawal Deadline" means the latest such date 
fixed by the Company. Unless already accepted for payment by the Company, 
Shares tendered may also be withdrawn (i) after October 20, 1994 and (ii) in 
the event another person commences a tender offer for any Shares, at any time 
until the expiration of seven business days from the date of such other 
person's tender offer is first published, sent or given to shareholders. To be
effective, a written, telegraphic, telex or facsimile transmission notice of
withdrawal must be received in a timely manner by the Depositary at one of its
addresses set forth in the Offer to Purchase.

The Company is making the Offer as part of a strategic refocusing of the        
Company and its sale of certain businesses as described in the Offer to 
Purchase. The Offer gives shareholders the opportunity to sell their Shares 
for a higher price than the average trading price available in the open market
for the ten day period immediately prior to the announcement of the Offer and
without the usual transaction costs associated with market sales.

Neither the Company nor the directors of the Company makes any recommendation   
to any shareholder as to whether to tender or refrain from tendering Shares. 
Each shareholder must make his or her own decision whether to tender Shares, 
and, if so, how many Shares to tender and at what price. The Company has been 
advised that none of its executive officers or directors intends to tender any
Shares pursuant to the Offer. The Offer to Purchase and the Letter of 
Transmittal contain important information which should be read before tenders 
are made.

The information required to be disclosed by Rule 13e-4(d)(1) of the General     
Rules and Regulations under the Securities Exchange Act of 1934 is contained 
in the Offer to Purchase and is incorporated herein by reference.

<PAGE>   3

Copies of the Offer to Purchase and Letter of Transmittal are being mailed to 
shareholders. Additional copies of the Offer to Purchase and Letter of  
Transmittal may be obtained from the Information Agent or the Dealer Manager 
at the addresses set forth below and will be furnished promptly at the 
Company's expense. Questions or requests for assistance may be directed to the
Information Agent or the Dealer Manager. Shareholders may also contact their
local broker, dealer, commercial bank or trust company for assistance 
concerning the Offer.

The Information Agent for the Offer is:

D.F. King & Co., Inc.
77 Water Street
New York, New York 10005
(800) 488-8095 (Toll Free)

The Dealer Manager for the Offer is:

J.P. Morgan Securities Inc.
60 Wall Street
New York, New York 10260-0060
(212) 648-7078 (Call Collect)
August 25, 1994


<PAGE>   1
                                                                 EXHIBIT (a)(9)


 
                     [LETTERHEAD OF MILLIPORE CORPORATION]
 
                     LETTER FROM SAVINGS PLUS PLAN TRUSTEES
 
                                                                 August 25, 1994
 
              Offer to Purchase Millipore Corporation Common Stock
 
     We are enclosing materials being sent to all Millipore Corporation
shareholders regarding the public offering to purchase its shares which the
Company has recently announced. Also enclosed is a description of an amendment
to the Millipore Corporation Employees' Participation and Savings Plan ("Savings
Plus Plan") adopted to address the tender offer and questions and answers
describing how the process works.
 
     As a participant in the Savings Plus Plan, you may elect to "tender" (offer
to sell) some or all of the shares (excluding fractional shares) currently
allocated to your Millipore Stock Fund Account in the Savings Plus Plan by
following the procedures described in the attachments to this letter. You also
may withdraw any tender you have made (and may re-tender at a different price if
you wish), provided you do so prior to the stated deadline. PLEASE NOTE THAT
ALTHOUGH THE DEADLINE FOR THE TRUSTEES TO TENDER YOUR SHARES IS SEPTEMBER 22,
1994, YOU MUST GIVE YOUR TENDER INSTRUCTION FORM TO THE TRUSTEES BY SEPTEMBER
19, 1994.
 
     Before making a decision, you should read carefully the materials in the
enclosed Offer to Purchase, the Notice to Savings Plus Participants and the
Tender Instruction Form. Neither Millipore Corporation nor its Board of
Directors makes any recommendation as to whether to tender or to refrain from
tendering. If you take no action, no shares in your Millipore Stock Fund Account
will be tendered by the Plan Trustees. The Plan Trustees will treat
confidentially your decision whether or not to tender these shares.
 
     You recently received your June 30, 1994 Savings Plus statement which
reflects the shares allocated to your Millipore Stock Fund Account. You may
tender at one or more prices some or all of the shares (excluding fractional
shares) held in your Millipore Stock Fund Account as of June 30, 1994.
 
     If you direct the Plan Trustees to tender the shares, the cash that is paid
for them will be reinvested by the Plan Trustees in a money market fund and then
as soon as practicable reinvested in accordance with your current election for
future contributions.
 
     If more shares of Company stock are tendered at or below the purchase price
than the Company has offered to purchase, only a pro rata portion of any shares
you direct the Plan Trustees to tender may be purchased.
 
     During the tender offer period (and thereafter for so long as legal
restrictions apply), the Plan Trustees will not purchase any shares of Millipore
Corporation stock for the Plan. Instead, the Plan Trustees will accumulate any
of your contributions, Company matching contributions, and any loan repayments
that you have directed into the Millipore Stock Fund. The Plan Trustees will
invest these amounts in a money market fund, and will resume purchases of shares
once the tender offer period is concluded.
 
     BECAUSE YOU HAVE A MILLIPORE STOCK FUND ACCOUNT, NO DISTRIBUTIONS WILL BE
MADE FROM YOUR ACCOUNT FOR ANY REASON (E.G. LOANS, EMERGENCY WITHDRAWALS,
DISTRIBUTIONS ON ACCOUNT OF RETIREMENT, DEATH, DISABILITY OR TERMINATION OF
EMPLOYMENT) DURING OR IMMEDIATELY FOLLOWING THE TENDER OFFER PERIOD WHETHER OR
NOT YOU ELECT TO TENDER YOUR SHARES.
 
     If you elect to tender shares from your Millipore Stock Fund Account, the
enclosed Tender Instruction Form must be received by The First National Bank of
Boston by September 19, 1994. The address to which the form can be mailed or
delivered is shown on the reply envelope.
<PAGE>   2
 
     Questions.  There is a special voice mailbox (extension 2379 in Bedford)
for any questions. All questions and requests for assistance should be addressed
to this voice mailbox. You will be asked to leave your name and telephone number
or extension at which you can be contacted.
 
     Share Balances.  To confirm the number of shares of Company Stock credited
to your Accounts in the Savings Plus Plan, you should refer to your June 30,
1994 Participant account statement, or you may call Benefits Express 2001 at any
time.
 
     YOU MUST COMPLETE AND SIGN YOUR TENDER INSTRUCTION FORM. IF YOU DO NOT SIGN
THE FORM, YOUR DIRECTIONS WILL NOT BE ACCEPTED AND THE INSTRUCTION FORM, AS WELL
AS YOUR DIRECTIONS, WILL BE VOID.
 
                                            Geoffrey E. Helliwell
                                            David B. Lawrence
                                            Geoffrey Nunes
                                            John K. Spring
 
                                            Trustees under the Millipore
                                            Corporation
                                            Employees' Participation and Savings
                                            Plan
 
                                        2
<PAGE>   3
 
                            TENDER INSTRUCTION FORM
                    FOR SHARES IN THE MILLIPORE CORPORATION
                   EMPLOYEES' PARTICIPATION AND SAVINGS PLAN
                           (THE "SAVINGS PLUS PLAN")
 
(NOTE:  Before completing this Tender Instruction Form, you should refer to your
June 30, 1994 Savings Plus account statement, or you may wish to call Benefits
Express 2001, to determine the balance of Shares in your Millipore Stock Fund as
of June 30, 1994, which will be available for tender.)
 
                                    [LABEL]
 
TO THE PLAN TRUSTEES:
 
     I am a participant in the above-referenced Savings Plus Plan who has Shares
in the Millipore Stock Fund and, as such, I have received a copy of the Offer to
Purchase dated August 25, 1994, relating to the Offer by Millipore Corporation,
a Massachusetts corporation (the "Company"), to purchase up to 3,500,000 shares
of the outstanding shares of its Common Stock (the "Shares").
 
     I wish to tender the Shares in my Millipore Stock Fund Account as indicated
below:
 
                              TENDER INSTRUCTIONS
 
/ / By checking this space, I represent that I wish to have the Plan Trustees
    tender           [whole number] Shares of Company Common Stock held in my
    Millipore Stock Fund Account in the Savings Plus Plan.
 
                                    ODD LOTS
 
/ / By checking this box, I represent that I owned beneficially as of the close
    of business on August 24, 1994, and will continue to own beneficially as of
    the Expiration Date (as defined in the Offer to Purchase) an aggregate
    (including shares held beneficially in the Savings Plus Plan, the Millipore
    Stock Option Plan, the Millipore Employees' Stock Purchase Plan or
    otherwise) of fewer than 100 shares, and I am instructing the Plan Trustees
    to tender all such shares at the price indicated below.
<PAGE>   4
 
     The tender is to be made at the price per Share indicated below under
"Price (In Dollars) Per Share at Which Shares are Being Tendered" on this
Instruction Form.
 
                        PRICE (IN DOLLARS) PER SHARE AT
                        WHICH SHARES ARE BEING TENDERED
- --------------------------------------------------------------------------------
              SHARES TENDERED AT PRICE DETERMINED BY DUTCH AUCTION
 
/ / I wish to maximize the chance of having the Company purchase all the Shares
    I am tendering (subject to the possibility of proration). Accordingly, by
    checking this one box INSTEAD OF ONE OF THE PRICE BOXES BELOW, I hereby
    tender my Shares and am willing to accept the Purchase Price resulting from
    the Dutch auction tender process. This action could result in receiving a
    price per Share as low as $52.00 or as high as $60.00.
 
                                       OR
 
                            SHARES TENDERED AT PRICE
                           DETERMINED BY STOCKHOLDER
 
                              CHECK ONLY ONE SPACE
         IF MORE THAN ONE SPACE IS CHECKED, OR IF NO SPACE IS CHECKED,
                     THE PLAN TRUSTEES CANNOT TENDER SHARES
 
<TABLE>
<S>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>
/ /  $ 52.00     / /  $ 53.00     / /  $ 54.00     / /  $ 55.00     / /  $ 56.00     / /  $ 57.00     / /  $ 58.00     / /  $ 59.00
/ /  $52.125     / /  $53.125     / /  $54.125     / /  $55.125     / /  $56.125     / /  $57.125     / /  $58.125     / /  $59.125
/ /  $52.250     / /  $53.250     / /  $54.250     / /  $55.250     / /  $56.250     / /  $57.250     / /  $58.250     / /  $59.250
/ /  $52.375     / /  $53.375     / /  $54.375     / /  $55.375     / /  $56.375     / /  $57.375     / /  $58.375     / /  $59.375
/ /  $52.500     / /  $53.500     / /  $54.500     / /  $55.500     / /  $56.500     / /  $57.500     / /  $58.500     / /  $59.500
/ /  $52.625     / /  $53.625     / /  $54.625     / /  $55.625     / /  $56.625     / /  $57.625     / /  $58.625     / /  $59.625
/ /  $52.750     / /  $53.750     / /  $54.750     / /  $55.750     / /  $56.750     / /  $57.750     / /  $58.750     / /  $59.750
/ /  $52.875     / /  $53.875     / /  $54.875     / /  $55.875     / /  $56.875     / /  $57.875     / /  $58.875     / /  $59.875
                                                                                                                       / /  $ 60.00
</TABLE>
 
     IF PORTIONS OF SHARE HOLDINGS ARE BEING TENDERED AT MORE THAN ONE PRICE,
USE A SEPARATE TENDER INSTRUCTION FORM FOR EACH PRICE SPECIFIED.
 
                                        2
<PAGE>   5
 
     I have read and understand the Offer to Purchase and the Letter from the
Plan Trustees and I agree to be bound by the terms of the Offer. I hereby direct
Geoffrey E. Helliwell, David B. Lawrence, Geoffrey Nunes and John K. Spring, as
Plan Trustees, to tender these Shares on my behalf and to hold and invest the
proceeds from the sale of these Shares in a money market fund, to be invested as
soon as practicable in accordance with my current investment election for future
contributions. I understand and declare that if the tender of my Shares is
accepted, the payment received therefor will be full and adequate compensation
for these Shares in my judgment, notwithstanding any potential fluctuation in
the price of the Shares between the last day I can withdraw my tender and the
date the Plan Trustees sell the Shares.
 
<TABLE>
<S>                           <C>              <C>
- ------------------------------                 -----------------------------------------------
             DATE                                         SIGNATURE OF PARTICIPANT

- ------------------------------                 -----------------------------------------------
    SOCIAL SECURITY NUMBER                           PLEASE PRINT NAME AND ADDRESS HERE

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

                                               -----------------------------------------------
                                                                Telephone No.
</TABLE>
 
     NOTE:  THIS TENDER INSTRUCTION FORM MUST BE COMPLETED AND SIGNED IF SHARES
HELD IN THE SAVINGS PLUS PLAN ARE TO BE TENDERED. IF THE FORM IS NOT SIGNED OR A
TENDER PRICE IS NOT SELECTED OR IF MORE THAN ONE PRICE IS SELECTED, THE
DIRECTIONS INDICATED WILL NOT BE ACCEPTED. PLEASE RETURN THIS TENDER INSTRUCTION
FORM TO THE PLAN TRUSTEES, C/O THE FIRST NATIONAL BANK OF BOSTON, USING THE
PREADDRESSED REPLY ENVELOPE PROVIDED WITH YOUR TENDER MATERIALS, BY SEPTEMBER
19, 1994.
 
     YOUR DECISION WHETHER OR NOT TO HAVE YOUR PLAN SHARES TENDERED WILL BE KEPT
CONFIDENTIAL.
 
                                        3
<PAGE>   6
 
                             MILLIPORE CORPORATION
 
                      NOTICE TO SAVINGS PLUS PARTICIPANTS
 
                                                                 AUGUST 25, 1994
 
TO:  ALL PARTICIPANTS IN THE MILLIPORE CORPORATION EMPLOYEES' PARTICIPATION AND
     SAVINGS PLAN (the "Savings Plus Plan") WITH ACCOUNTS INVESTED IN THE
     MILLIPORE STOCK FUND
 
     Millipore Corporation (the "Company") has announced an Offer to Purchase
under which it is offering to purchase 3,500,000 Shares of the outstanding
shares of its Common stock, par value $1 per share (such shares, together with
all other outstanding shares of Common Stock of the Company including the
associated stock purchase rights (the "Rights") issued pursuant to the
Shareholder Rights Agreement dated as of April 15, 1988 between the Company and
The First National Bank of Boston, as Rights Agent, are referred to here as the
"Shares"). Unless the context requires otherwise, all reference herein to Shares
include the associated Rights. This Offer became effective August 25, 1994 and
will expire at 12:00 midnight, New York City time (Eastern Daylight Time) on
September 22, 1994. You, as a Savings Plus Plan participant, may participate in
this Offer by instructing the Plan Trustees (by September 19, 1994) to tender
your Shares in the Millipore Stock Fund ("Plan Shares") for purchase by the
Company.
 
     YOUR DECISION WHETHER OR NOT TO HAVE YOUR PLAN SHARES TENDERED WILL BE KEPT
CONFIDENTIAL.
 
     Enclosed with this notice is a copy of documents describing the Offer which
have been furnished to holders of Company Common Stock. Read these materials so
that you may properly make your decision regarding this Offer.
 
     A Tender Instruction Form (yellow form) is also enclosed for you to use to
direct the Plan Trustees regarding the Offer. IF NO DIRECTION IS RECEIVED, THE
PLAN TRUSTEES WILL NOT TENDER ANY OF YOUR PLAN SHARES AND THEY WILL REMAIN IN
THE PLAN IN YOUR MILLIPORE STOCK FUND ACCOUNT.
 
     There is a special voice mailbox (extension 2379 in Bedford) if you have
questions about the Tender or your Share balance or if you need help.
 
     DO NOT CALL THE FIRST NATIONAL BANK OF BOSTON OR YOUR BENEFITS
ADMINISTRATOR TO GIVE YOUR DECISION REGARDING THE OFFER. YOU MAY ONLY RESPOND BY
COMPLETING AND MAILING THE ENCLOSED TENDER INSTRUCTION FORM.
 
     This booklet contains a "Summary of Material Modifications to Savings Plus
Plan" describing certain temporary amendments to the Savings Plus Plan
addressing the Tender Offer and "Questions and Answers on Savings Plus Plan
Tender Rights and Procedures" describing the Tender Offer and your rights as a
Savings Plus Plan participant regarding the tendering of Plan Shares and the
investment of the tender proceeds.
 
             SUMMARY OF MATERIAL MODIFICATIONS TO SAVINGS PLUS PLAN
 
     Effective August 25, 1994, the Company amended the Savings Plus Plan, in
three respects which are described generally below.
 
     Participant Directed Tenders.  Notwithstanding any provision of the Savings
Plus Plan to the contrary, participants (who are not persons whose transactions
in Shares are restricted by Rule 16b-3 of the Securities Exchange Act of 1934)
will be permitted, during the period commencing with the date of the Tender
Offer and ending with its termination, to direct the Plan Trustees to sell some
or all of the Shares (excluding fractional shares) allocated to Millipore Stock
Fund Accounts as of June 30, 1994 ("Plan Shares"), pursuant
<PAGE>   7
 
to the Tender Offer. Shares acquired by the Savings Plus Plan after June 30,
1994, but not allocated to participants' Accounts until September 30, 1994,
cannot be tendered by participants.
 
     An instruction to tender Plan Shares may include some or all of your Plan
Shares (excluding fractional shares).
 
     Suspension of Investment in Shares.  Notwithstanding any provision of the
Savings Plus Plan to the contrary, commencing August 25, 1994 and until the
later of ten business days after the Tender Offer terminates or all legal
restrictions upon purchases by the Savings Plus Plan have ceased, the Plan
Trustees will not purchase any additional Shares for the Savings Plus Plan. All
Participant Contributions, Employer Matching Contributions, dividends on Shares
held by the Savings Plus Plan or other funds which, pursuant to the Savings Plus
Plan or to participants' directions, normally would be used by the Plan Trustees
to acquire Shares will be held by the Plan Trustees and invested in a money
market fund until the termination of the Tender Offer, or the cessation of legal
restrictions if later. As promptly thereafter as is administratively feasible,
the Plan Trustees will reinvest these funds in Shares in accordance with the
terms of the Savings Plus Plan.
 
     Suspension of Distributions.  Notwithstanding any provisions of the Savings
Plus Plan to the contrary, commencing August 25, 1994 and until the termination
of the Tender Offer and the settlement of all sales of Shares thereunder, the
Plan Trustees will not make any distributions from the Savings Plus Accounts of
any Participant whose Account is invested in the Millipore Stock Fund, including
any loans, emergency withdrawals, or distributions on account of retirement,
death, disability or termination of employment.
 
     Limited Effect of Plan Amendments.  The above-described Savings Plus Plan
amendments are of limited duration. By their terms, immediately upon the
termination of the Tender Offer, these amendments will automatically expire and
all of the terms, provisions and procedures of the Savings Plus Plan as they
existed immediately before these amendments will again be applicable.
 
                            QUESTIONS AND ANSWERS ON
                 SAVINGS PLUS PLAN TENDER RIGHTS AND PROCEDURES
 
                          A.  DESCRIPTION OF THE OFFER
 
 1.  WHAT IS THE OFFER? On August 25, 1994, the Company offered to purchase up
     to 3,500,000 Shares of its Common Stock in what is commonly called a "Dutch
     Auction", at prices not greater than $60.00 nor less than $52.00 per share.
     This Offer will be open from August 25, 1994 until it expires at 12:00
     midnight, Eastern Daylight Time, September 22, 1994, unless extended by the
     Company. Savings Plus Plan participants who hold Shares in their Millipore
     Stock Fund Accounts ("Plan Shares") may provide for the tender of Shares
     for purchase pursuant to this Offer by so indicating on the enclosed Tender
     Instructions Form and returning it as directed by September 19, 1994.
 
     The Tender Offer is fully described in the Offer To Purchase provided to
you. PLEASE READ IT CAREFULLY.
 
 2.  HOW DOES A "DUTCH AUCTION" OPERATE AND WHAT IS IT? A "Dutch Auction" is an
     offer that permits shareholders to select a price, in this case within a
     range of $52.00 to $60.00 per share, at which to tender their Shares. Only
     one price (the "Purchase Price") will apply to all Shares accepted. The
     Purchase Price may equal or exceed the price at which you directed Shares
     to be tendered. If you direct Shares to be tendered at a price that exceeds
     the Purchase Price, your Shares will not be purchased.
 
 3.  HOW WILL I KNOW THE "PURCHASE PRICE" THAT I WILL RECEIVE FOR SHARES THAT I
     DIRECT TO BE TENDERED? The Purchase Price will equal the lowest price at
     which Shares are tendered within the acceptable range that will permit the
     Company to purchase 3,500,000 Shares. This price will be determined by
     accumulating Shares tendered at each price, starting with Shares tendered
     at the lowest price, and advancing upward through the range of prices at
     which Shares are tendered.
 
                                        2
<PAGE>   8
 
The Company has offered to purchase 3,500,000 Shares. As an example of how the
Dutch Auction works, assume that the range of prices at which Shares are
tendered is as follows:
 
<TABLE>
<CAPTION>
                                                                              CUMULATIVE
                                                             NUMBER             NUMBER
                                                               OF                 OF
                                                             SHARES             SHARES
         PRICE                                              TENDERED           TENDERED
        ------                                              --------           --------
        <S>                                                  <C>               <C>
        $52.00                                               750,000             750,000
             A                                               625,000           1,375,000
             B                                               825,000           2,200,000
             C                                               450,000           2,650,000
             D                                               600,000           3,250,000
             E                                               450,000           3,700,000
             F                                               400,000           4,100,000
             G                                               250,000           4,350,000
        $60.00                                               250,000           4,600,000
</TABLE>
 
     The Purchase Price for all Shares accepted would be $E because that is the
     lowest price at which the Company can purchase 3,500,000 Shares. Shares
     tendered at prices above $E per share would not be accepted. Because the
     number of Shares tendered at or below the Purchase Price (3,700,000)
     exceeds the total number of Shares to be purchased (3,500,000), all Shares
     tendered would be accepted on a pro rata basis. "Pro rata" simply means
     that each person can sell an equal proportion of the Shares offered to the
     Company. Using the example, the Company would calculate a proration
     percentage which would equal 94.59%, the ratio of the total number of
     Shares to be purchased, 3,500,000, divided by the total number of Shares
     tendered at or below $E per Share, 3,700,000. Therefore, if you tendered
     1,000 Shares, the Company would purchase 946 shares at $E per Share. If the
     total number of your Shares (including those held under the Millipore Stock
     Option Plan, the Millipore Employees' Stock Purchase Plan or otherwise) is
     less than 100, the proration percentage will not be applied to your Shares
     tendered at or below the Purchase Price. (If you hold fewer than 100
     Shares, in the aggregate, you must check the second box on the Tender
     Instruction Form to avoid proration.)
 
 4.  WHAT ARE MY RIGHTS UNDER THE OFFER? The records of the Savings Plus Plan
     indicate that Shares of Company Common Stock are allocated to your
     Millipore Stock Fund Account. You may tender some or all of these Shares.
     Because all of these Shares are held in trust for your benefit, they are
     registered in the name of the Plan Trustees. So, the Plan Trustees will
     actually tender Plan Shares as you instruct.
 
     YOU MUST DIRECT THE PLAN TRUSTEES IF YOU WANT TO TENDER YOUR PLAN SHARES.
     THE PLAN TRUSTEES WILL TENDER YOUR PLAN SHARES ONLY IF YOU DIRECT THEM TO
     DO SO. IF YOU DO NOT RESPOND, YOUR PLAN SHARES WILL REMAIN IN YOUR
     MILLIPORE STOCK FUND ACCOUNT.
 
 5.  WHICH DOCUMENTS DID I RECEIVE IN THE TENDER MATERIALS AND WHAT IS THEIR
     PURPOSE? You received the following materials in this mailing:
 
        --President's Letter. This announces the Offer.
 
        --Offer to Purchase Dated August 25, 1994. This document (white, bound
        document) describes the Offer. PLEASE READ IT CAREFULLY.
 
        --Letter of Transmittal. This document (long blue document) is part of
        the "Offer" and therefore is being provided to you. However, it does not
        apply to, or provide detailed instructions for, tendering Plan Shares.
        Do not use it to tender Savings Plus Plan Shares. If you hold Shares
        outside of the Savings Plus Plan, please refer to this Letter of
        Transmittal for use in tendering those Shares.
 
        --Letter from the Savings Plus Plan Trustees. This transmits information
        about the Savings Plus Plan amendment and the tender offer.
 
                                        3
<PAGE>   9
 
        --Notice to Savings Plus Participants (white document you are reading)
        which includes:
 
           --Summary of Material Modifications to the Savings Plus Plan. This
           describes the temporary amendment to the Savings Plus Plan which
           addresses the tender offer and precedes these questions and answers
           in this document.
 
           --Questions and Answers on Savings Plus Plan Tender Rights and
           Procedures.
 
        --Tender Instruction Form. (yellow form) YOU MUST COMPLETE, SIGN AND
        MAIL THIS DOCUMENT TO THE FIRST NATIONAL BANK OF BOSTON IF YOU WISH TO
        DIRECT THE PLAN TRUSTEES TO TENDER YOUR PLAN SHARES. THIS DOCUMENT IS
        POSTED WITH YOUR NAME AND SOCIAL SECURITY NUMBER. USE IT TO DIRECT A
        TENDER OF YOUR SHARES.
 
        --Reply Envelope. A preaddressed envelope for your reply.
 
 6.  HOW DO I DIRECT THE PLAN TRUSTEES? The only way that you can tender your
     Plan Shares is by completing the Tender Instruction Form (yellow) as
     described, signing and returning it to the Plan Trustees, in care of The
     First National Bank of Boston, which will process your instructions. The
     address is on the return envelope you should use to return the Tender
     Instruction Form.
 
     THE TENDER INSTRUCTION FORM MUST BE RECEIVED BY THE FIRST NATIONAL BANK OF
     BOSTON BEFORE 5:00 P.M., BOSTON TIME (EASTERN DAYLIGHT TIME), ON SEPTEMBER
     19, 1994. YOU MUST SIGN AND COMPLETE THE FORM FOR YOUR DIRECTION TO BE
     VALID.
 
     TO PROPERLY DIRECT THE PLAN TRUSTEES TO TENDER PLAN SHARES ON YOUR BEHALF
     YOU MUST:
 
        --INSTRUCTIONS. Read carefully and follow exactly the instructions in
        the Letter from Savings Plus Plan Trustees and the Tender Instruction
        Form. These will tell you how to direct the Plan Trustees regarding your
        Shares.
 
        --FORM. Complete the enclosed Tender Instruction Form.
 
        --SHARES. Designate on the Tender Instruction Form the number of Shares
        (excluding fractional shares) you wish to be tendered.
 
        --PRICE. You must select a price or prices at which your Plan Shares
        will be tendered. IF YOU DO NOT SELECT A PRICE, YOUR PLAN SHARES WILL
        NOT BE TENDERED.
 
        --SIGNATURE. You must sign the Tender Instruction Form to complete your
        instruction. Unless you sign the Tender Instruction Form, your direction
        cannot be honored and the Tender Instruction Form will be void.
 
        --MAILING. A preaddressed return envelope has been enclosed with your
        Tender materials. Use this envelope to return your completed Tender
        Instruction Form if you wish to have the Plan Trustees tender your Plan
        Shares.
 
     Please be precise in providing your instruction and please act PROMPTLY.
 
 7.  HOW DO I SEND MY INSTRUCTIONS TO THE PLAN TRUSTEES? Please return your
     instructions PROMPTLY, recognizing the slow delivery time inherent in the
     U.S. mail today. You may mail your Tender Instruction Form to the Trustees
     c/o The First National Bank of Boston in the preaddressed reply envelope
     that the Plan Trustees has provided for your reply or send it by an
     alternate faster means (such as overnight courier). You may not fax your
     instructions. DO NOT DELIVER YOUR INSTRUCTIONS TO YOUR HUMAN RESOURCES
     DEPARTMENT OR TO YOUR BENEFITS ADMINISTRATOR.
 
 8.  MUST I PROVIDE DIRECTIONS TO THE PLAN TRUSTEES? You must respond IF you
     wish the Plan Trustees to tender your Plan Shares. Do not respond if you do
     not wish to tender your Plan Shares.
 
                                        4
<PAGE>   10
 
 9.  HOW MANY PLAN SHARES MAY I TENDER AND HOW DO I LEARN THAT NUMBER? Review
     the June 30, 1994 Savings Plus account statement you recently received or
     call Benefits Express 2001, to determine the number of Shares held in your
     Millipore Stock Fund Account as of June 30, 1994. You may tender only a
     whole number of Shares, not any fractional Shares.
 
10.  WHAT IF I HAVE SHARES IN MY SAVINGS PLUS PLAN ACCOUNT AND HOLD SHARES OF
     MILLIPORE CORPORATION COMMON STOCK OUTSIDE OF THE SAVINGS PLUS PLAN? If you
     have Shares in the Savings Plus Plan and have actual Shares in your
     possession (or at a brokerage firm), you will receive two or more sets of
     Tender materials. You should be careful to follow the directions that apply
     to each kind of Shares.
 
11.  WHO WILL KNOW WHETHER I TENDERED MY PLAN SHARES? Your directions to the
     Plan Trustees ARE CONFIDENTIAL. For this reason, your instructions are sent
     to The First National Bank of Boston. Individual instructions will only be
     disclosed to the recordkeeper as necessary to complete the Tender.
 
12.  CAN I CHANGE MY MIND AND WITHDRAW MY PLAN SHARES THAT I DIRECTED TO BE
     TENDERED? Yes, but only if you perform the following steps:
 
        --You must send a signed notice of withdrawal to the Plan Trustees, c/o
        The First National Bank of Boston, P.O. Box 1889, Boston, MA.
 
        --The notice of withdrawal must be in writing. You may fax your notice
        of withdrawal to The First National Bank of Boston at fax number (617)
        575-2232.
 
        --The notice of withdrawal must state your name, the number of Plan
        Shares that you wish to withdraw from the Offer and that you are
        withdrawing Plan Shares that you instructed the Savings Plus Plan
        Trustees to tender on your behalf;
 
        --The notice of withdrawal must be received by The First National Bank
        of Boston before Midnight Boston Time on September 22, 1994;
 
     If you wish to withdraw Plan Shares and re-tender them at a different price
     or prices, please attach your notice of withdrawal to the Tender
     Instruction Form used to re-tender such Plan Shares.
 
13.  CAN I RE-TENDER MY PLAN SHARES? Yes. If you wish to re-tender your Savings
     Plus Plan Shares you must complete another Tender Instruction Form and
     return it to the The First National Bank of Boston by September 19, 1994.
     You may obtain another copy by calling the special voice mailbox. See
     Question #21.
 
            B.  RESULT OF THE TENDER: SHARES SOLD AND PRICE RECEIVED
 
14.  WILL ALL PLAN SHARES THAT I DIRECT THE TRUSTEE TO TENDER BE PURCHASED? This
     depends upon the total number of Shares tendered and the price(s) you
     select. If you tender some Shares at a price equal to or below the
     "Purchase Price" at least some of your Shares will be purchased. If more
     Shares are tendered by all shareholders at or below the Purchase Price than
     the Company had offered to purchase, a pro rata portion of the Shares that
     you directed to be tendered will be purchased. However, if you direct the
     Plan Trustees to tender at a price which turns out to be higher than the
     Purchase Price, the Company will not accept these Shares. See Question #3
     for a description of how the Purchase Price will be determined.
 
     Plan Shares held in a Participant's Savings Plus Plan Account that are not
     accepted will remain in the Millipore Stock Fund subject to normal Plan
     rules.
 
15.  HOW WILL I KNOW IF MY PLAN SHARES HAVE BEEN PURCHASED? After the Offer
     Period expires, all Tender directions will be tabulated, which may take up
     to two weeks. Soon thereafter,
 
                                        5
<PAGE>   11
 
     you will be advised of the number, if any, of your Plan Shares which were
     accepted and the Purchase Price determined under the Tender.
 
         C.  OPERATION OF THE SAVINGS PLUS PLAN DURING THE TENDER OFFER
 
16.  WHAT HAPPENS TO MY MILLIPORE STOCK FUND CONTRIBUTIONS MADE AFTER AUGUST 25,
     1994? Beginning August 25, 1994, the Plan Trustees stopped purchasing
     Shares for the Millipore Stock Fund. Company and participant contributions
     made to the Millipore Stock Fund, and loan repayments, dividends and other
     funds which are normally allocated to the Millipore Stock Fund, which are
     received by the Savings Plus Plan during the Offer Period and for 10
     business days thereafter (while the results are tabulated) will be
     accumulated and invested in a money market fund. Thereafter, upon the
     cessation of legal restrictions, purchases by the Plan Trustees will resume
     and the accumulated funds will be invested in Millipore Stock.
 
17.  WHAT HAPPENS IF I REQUEST A DISTRIBUTION, LOAN OR WITHDRAWAL FOLLOWING THE
     ANNOUNCEMENT OF THE TENDER OFFER DURING THE OFFER PERIOD? Distributions,
     loans or withdrawals from the Savings Plus Plan will not be made to any
     Participant whose Account is invested in the Millipore Stock Fund after the
     Tender Offer has been announced and before the conclusion of the Offer
     Period. Authorized distributions or withdrawals received before or during
     this period will be processed as soon as reasonably feasible thereafter.
 
18.  MAY I REQUEST A CHANGE IN MY INVESTMENT SELECTIONS AFTER THE TENDER OFFER
     PERIOD ENDS? You may change your investment election for future
     contributions or reallocate your existing Account balances at the end of
     each calendar quarter under the Plan's normal rules.
 
19.  WILL I BE TAXED ON ANY PROCEEDS RECEIVED IN 1994 FROM THE MILLIPORE STOCK
     THAT IS TENDERED? No. Because tender proceeds received from Plan Shares
     will be received by and held in the Savings Plus Plan, they will not be
     subject to current income taxes.
 
                     REINVESTMENT OF TENDER OFFER PROCEEDS
 
20.  HOW WILL THE SAVINGS PLUS PLAN INVEST THE PROCEEDS RECEIVED FROM THE PLAN
     SHARES THAT ARE TENDERED? Proceeds received from this Tender Offer will be
     reinvested by the Plan Trustees in the money market fund and reinvested as
     soon as practicable in accordance with your current investment election for
     future contributions.
 
                             ADDITIONAL INFORMATION
 
21.  WHAT DO I DO IF I HAVE ANY QUESTIONS ABOUT THE TENDER OFFER? If you have
     questions about the operation of the Tender Offer or need help in properly
     responding to the Offer, you may call the special voice mailbox (extension
     2379 in Bedford) established for questions at any time. You will be asked
     to leave your name and a telephone number or extension at which you can be
     contacted.
 
                            ------------------------
 
     This document is a part of a prospectus covering securities registered
under the Securities Act of 1933. This document must be read together with the
Offer to Purchase and Letter of Transmittal. Those documents constitute the
Offer and will be controlling.
 
                                        6

<PAGE>   1
                                                                
                                                                 EXHIBIT (a)(10)



  
                                                                 August 25, 1994
 
To:  Holders of Stock Options in the Millipore Corporation Combined 1985 Stock
Option Plan
 
     Millipore Corporation is offering to purchase 3,500,000 shares
(approximately 12% of the outstanding shares) of its Common Stock, $1.00 par
value, from its stockholders at a price not greater than $60 nor less than $52
per Share. This letter and copies of the relevant documents pursuant to which
the Company is making such offer (the "Offer") are being sent to you by reason
of your ownership of one or more outstanding options to purchase Shares under
the Millipore Corporation Combined 1985 Stock Option Plan (the "Option Plan").
 
     The Company is conducting the Offer through a procedure commonly referred
to as a "Dutch Auction" tender offer. This procedure allows a stockholder to
select the price within the specified price range at which a stockholder is
willing to sell his Shares to the Company. Based upon the number of Shares
tendered and the prices specified by the tendering stockholders, the Company
will determine the lowest single per Share price within that price range (the
"Purchase Price") that will allow it to buy 3,500,000 Shares (or such lesser
number of Shares as are validly tendered within such price range). All of the
Shares that are validly tendered at prices at or below the Purchase Price (and
not withdrawn) will, subject to possible proration, be purchased at the Purchase
Price, net to the selling stockholder in cash. All other Shares which are
tendered and not purchased will be returned to the tendering stockholders.
 
     As a holder of an outstanding and vested option granted pursuant to the
Option Plan you may elect to tender some or all of the Shares you are entitled
to receive upon exercise of your option (the "Option Shares") by following the
procedures described in the attachments to this letter. Alternatively, you may
pay cash upon the exercise in whole or in part of your options (subject to
vesting) in accordance with the terms of the Option Plan, receive the Shares
issuable upon exercise and tender all or any portion of them in the Offer. You
also may withdraw any tender of Option Shares you have made (and re-tender at a
different price if you wish), provided you do so prior to the deadline stated in
the Offer to Purchase accompanying this letter.
 
     If you wish to tender Shares subject to vested outstanding options, you may
do so by providing the Company with notice of exercise using the accompanying
form captioned "Notice of Instructions". The Notice of Instructions must be
received by the Company no later than 5:00 p.m. Boston time on Monday, September
19, 1994. Timely delivery of the Notice of Instructions to the Company
constitutes an irrevocable election by you to exercise your vested option for a
number of Option Shares equal to the number specified in the Notice (not greater
than the total number of Shares for which your vested option is exercisable)
eligible to be purchased by the Company after application of the proration and
other procedures described above and in the enclosed documents, in which case
the Company will instruct the Depositary, to the extent your Option Shares are
Purchased in the Offer, to deliver to you a check for the Purchase Price less
the exercise price(s) of your options and any applicable taxes required to be
withheld.
 
     Stock Options exercised pursuant to the procedures described in the
preceding paragraph may not be entitled to the special tax treatment accorded
incentive stock options. An optionee who exercises a stock option in accordance
with the procedures described above will have ordinary income, subject to
applicable tax withholding, equal to the difference between the Purchase Price
of the Option Shares and the exercise price for those Shares. It is expected
that the Company will, in general, be entitled to a corresponding deduction. For
additional information concerning the possible federal income tax consequences
of exercising an option in the circumstances described above, or for information
concerning state, local or non-U.S. consequences where relevant, you should
consult a tax advisor.
<PAGE>   2
 
     Please note that although the deadline for the tender of your Option Shares
is September 22, 1994, you must give your instructions with regard to option
exercise to the Company's Treasury Department by September 19, 1994.
 
     If upon the exercise of vested outstanding options following the procedures
set forth in this letter and the attached Notice of Instructions, you would
beneficially own fewer than 100 Shares, then you may qualify as an Odd Lot
Stockholder (as defined in Section 2 of the Offer to Purchase) and may be
entitled to tender your Option Shares without proration. To take advantage of
this preferential treatment, complete the box captioned "Odd Lots" in the Notice
of Instructions on the reverse side.
 
     NEITHER THE COMPANY NOR ITS BOARD OF DIRECTORS MAKES ANY RECOMMENDATION AS
TO WHETHER TO EXERCISE OR REFRAIN FROM EXERCISING ANY OUTSTANDING OPTIONS TO
PURCHASE SHARES OR TO TENDER OR REFRAIN FROM TENDERING ANY SHARES.
 
     The Offer is explained in detail in the enclosed documents, which we urge
you to read carefully.
 
     If you wish to exercise any option please read and fill out the Notice of
Instructions very carefully.
 
     SHOULD YOU HAVE ANY QUESTIONS PLEASE CONTACT GEOFF HELLIWELL AT (617)
533-2032 IN THE MILLIPORE CORPORATION TREASURY DEPARTMENT.
 
                                            Sincerely,
 
                                            Treasury Department
                                            MILLIPORE CORPORATION
<PAGE>   3
 
                             NOTICE OF INSTRUCTIONS
                                   (OPTIONS)
 
TO: Millipore Corporation -- Treasury Department
 
     I acknowledge receipt of your letter enclosing material relating to
Millipore Corporation's Offer to Purchase Shares.
 
     I hereby exercise the options identified below granted to me for the
purchase of Millipore Corporation Common Stock ("Option Shares") subject to the
condition that with respect to any underlying Option Shares tendered but not
purchased because of proration or not purchased because the price selected was
higher than the Purchase Price the option shall be deemed not to have been
exercised.
 
<TABLE>
<CAPTION>
                          (A)                 (B)             PLAN
    GRANT              NUMBER OF             OPTION           TYPE
    DATE          SHARES TO EXERCISE         PRICE          ISO/NOO
- -------------    ---------------------    ------------    ------------
<S>              <C>                      <C>             <C>
                                          $
- -------------    ---------------------    ------------    ------------
                                          
                                          $
- -------------    ---------------------    ------------    ------------
                                                      
                                          $           
- -------------    ---------------------    ------------    ------------
                                                      
                                          $           
- -------------    ---------------------    ------------    ------------
                                                      
                                          $      
- -------------    ---------------------    ------------    ------------
                                                      
                                          $      
- -------------    ---------------------    ------------    ------------
                                                      
                                          $      
- -------------    ---------------------    ------------    ------------
                                                      
                                          $      
- -------------    ---------------------    ------------    ------------
   Totals                                             
                 ====================
</TABLE>
 
     This notice instructs you to tender, at the price I have checked below, all
Option Shares which I am entitled to receive upon exercise of the above
mentioned option pursuant to the terms and conditions set forth in the Offer to
Purchase dated August 25, 1994 and the accompanying Letter of Transmittal you
have furnished to me. By signing this Notice of Instructions I hereby agree that
if any Option Shares are validly tendered and accepted, I will receive a cash
payment equal to the difference between the Option Price(s) indicated above and
the Purchase Price, less any taxes required to be withheld, and further agree to
be bound by the terms and conditions set forth in the Offer to Purchase and the
related Letter of Transmittal.
<PAGE>   4
 
                        PRICE (IN DOLLARS) PER SHARE AT
                     WHICH OPTION SHARES ARE BEING TENDERED
                (SEE INSTRUCTION 5 OF THE LETTER OF TRANSMITTAL)
- --------------------------------------------------------------------------------
 
                              CHECK ONLY ONE BOX.
                     IF MORE THAN ONE BOX IS CHECKED, OR IF
                      NO BOX IS CHECKED, THERE IS NO VALID
                               TENDER OF SHARES.
 
                            SHARES TENDERED AT PRICE
                          DETERMINED BY DUTCH AUCTION
 
/ / The undersigned wants to maximize the chance of having the Company purchase
    all the Option Shares the undersigned is tendering (subject to the
    possibility of proration). Accordingly, by checking this one box INSTEAD OF
    ONE OF THE PRICE BOXES BELOW, the undersigned hereby tenders Shares and is
    willing to accept the Purchase Price resulting from the Dutch auction tender
    process. This action could result in receiving a price per Share as low as
    $52.00 or as high as $60.00.
 
                                         OR
 
                              SHARES TENDERED AT PRICE
                             DETERMINED BY STOCKHOLDER
 
<TABLE>
<S>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>         <C>  <C>
/ /  $ 52.00     / /  $ 53.00     / /  $ 54.00     / /  $ 55.00     / /  $ 56.00     / /  $ 57.00     / /  $ 58.00     / /  $ 59.00
/ /  $52.125     / /  $53.125     / /  $54.125     / /  $55.125     / /  $56.125     / /  $57.125     / /  $58.125     / /  $59.125
/ /  $52.250     / /  $53.250     / /  $54.250     / /  $55.250     / /  $56.250     / /  $57.250     / /  $58.250     / /  $59.250
/ /  $52.375     / /  $53.375     / /  $54.375     / /  $55.375     / /  $56.375     / /  $57.375     / /  $58.375     / /  $59.375
/ /  $52.500     / /  $53.500     / /  $54.500     / /  $55.500     / /  $56.500     / /  $57.500     / /  $58.500     / /  $59.500
/ /  $52.625     / /  $53.625     / /  $54.625     / /  $55.625     / /  $56.625     / /  $57.625     / /  $58.625     / /  $59.625
/ /  $52.750     / /  $53.750     / /  $54.750     / /  $55.750     / /  $56.750     / /  $57.750     / /  $58.750     / /  $59.750
/ /  $52.875     / /  $53.875     / /  $54.875     / /  $55.875     / /  $56.875     / /  $57.875     / /  $58.875     / /  $59.875
                                                                                                                       / /  $ 60.00
</TABLE>
 
                                    ODD LOTS
 
/ / By checking this box, the undersigned represents that the undersigned owned
    beneficially as of the close of business on August 24, 1994, and will own as
    of the Expiration Date an aggregate of fewer than 100 Option Shares, and is
    instructing the Company as its agent to tender all such Shares at the price
    indicated above.
 
<TABLE>
<S>                         <C>
                            ----------------------------------------------
                                              SIGNATURE
                            ----------------------------------------------
                                        SOCIAL SECURITY NUMBER
                            ----------------------------------------------
                                  PLEASE PRINT NAME AND ADDRESS HERE
                            ----------------------------------------------

                            ----------------------------------------------
Dated:______________, 1994
                            ----------------------------------------------
                                              TELEPHONE
</TABLE>
<PAGE>   5
                            QUESTIONS AND ANSWERS ON
               STOCK OPTION HOLDERS' TENDER RIGHTS AND PROCEDURES




1.  WHAT  IS  THE OFFER?  On August 25, 1994, the Company offered to purchase
    up  to 3,500,000 Shares of its Common Stock in what is commonly called  a
    "Dutch  Auction," at prices not greater than $60 nor less  than  $52  per
    share.  This Offer will be open from August 25, 1994 until it expires  at
    12:00  midnight,  Eastern  Daylight  Time,  September  22,  1994,  unless
    extended  by  the Company.  Employees who hold vested options  under  the
    Company's  1985  Stock Option Plan may provide for the tender  of  Shares
    for  purchase pursuant to this Offer by exercising their options  and  so
    indicating  their desire to tender on the enclosed Notice of Instructions
    Form and returning it as directed by Monday, September 19, 1994.

    The  Tender Offer is fully described in the Offer To Purchase  provided
    to you.  PLEASE READ IT CAREFULLY.

2.  HOW DOES A "DUTCH AUCTION" OPERATE AND WHAT IS IT?  A "Dutch Auction"  is
    an  offer that permits shareholders to select a  price,  in  this  case
    within  a range of $52 to $60 per share, at which to tender their Shares.
    Only one price (the "Purchase Price") will apply to all Shares accepted.
    The Purchase  Price may be less than, equal or exceed the price at which
    you directed Shares to be tendered.  If you direct Shares to be tendered
    at a price that exceeds the Purchase Price, your Shares will not be
    purchased, and your option will not be exercised.

3.  HOW  WILL I KNOW THE "PURCHASE PRICE" THAT I WILL RECEIVE FOR SHARES THAT
    I  DIRECT TO BE TENDERED?  The Purchase Price will equal the lowest price
    at  which  Shares  are  tendered within the acceptable  range  that  will
    permit  the  Company to purchase 3,500,000 Shares.  This  price  will  be
    determined  by accumulating Shares tendered at each price, starting  with
    Shares  tendered  at the lowest price, and advancing upward  through  the
    range  of  prices  at  which Shares are tendered. The Company has offered
    to  purchase 3,500,000  Shares.  As an example of how the Dutch Auction
    works, assume that the range of prices at which Shares are tendered is as
    follows:


                                       1

<PAGE>   6


<TABLE>
<CAPTION>
                     Number of      Cumulative Number
        Price     Shares Tendered   of Shares Tendered
          <S>          <C>            <C>
          $52          750,000          750,000
            A          625,000        1,375,000
            B          825,000        2,200,000
            C          450,000        2,650,000
            D          600,000        3,250,000
            E          450,000        3,700,000
            F          400,000        4,100,000
            G          250,000        4,350,000
          $60          250,000        4,600,000
</TABLE>

    The  Purchase Price for all Shares accepted would be $E because  that  is
    the  lowest  price  at which the Company can purchase  3,500,000  Shares.
    Shares  tendered  at  prices above $E per share would  not  be  accepted.
    Because  the  number  of Shares tendered at or below the  Purchase  Price
    (3,700,000)   exceeds  the  total  number  of  Shares  to  be   purchased
    (3,500,000), all Shares tendered would be accepted on a pro  rata  basis.
    "Pro rata" simply means that each person can sell an equal proportion  of
    the  Shares offered to the Company.  Using the example, the Company would
    calculate a proration percentage which would equal 94.59%, the  ratio  of
    the  total  number of Shares to be purchased, 3,500,000  divided  by  the
    total  number  of  Shares tendered at or below $E per  Share,  3,700,000.
    Therefore,  if you tendered 1,000 Shares, the Company would purchase  946
    shares  at  $E per Share.  If the total number of your Shares  (including
    those   held  under  the  Millipore  Stock  Option  Plan,  the  Millipore
    Employees'  Stock  Purchase Plan or otherwise)  is  less  than  100,  the
    proration  percentage will not be applied to your Shares tendered  at  or
    below  the  Purchase Price.  (If you hold less than 100  Shares,  in  the
    aggregate,  you  must check the second box on the Notice of  Instructions
    Form to avoid proration.)

4.  WHAT  ARE MY RIGHTS AS AN OPTION HOLDER UNDER THE OFFER?  As a holder  of
    vested  but  unexecuted options you have the opportunity to exercise  all
    or  part of your option and tender all of the Shares you are entitled  to
    receive  upon such exercise (the "Option Shares").  Because all of  these
    Option  Shares  are  not  issued to you at  the  time  of  exercise,  the
    Treasury Department will deliver your instructions to the Depository.

    YOU  MUST EXERCISE YOUR OPTION IF YOU WANT TO TENDER YOUR OPTION  SHARES.
    THE COMPANY'S TREASURY DEPARTMENT WILL TENDER YOUR OPTION SHARES ONLY  IF
    YOU  DIRECT THEM TO DO SO.  IF YOU DO NOT RESPOND, YOU OPTION WILL REMAIN
    UNEXERCISED.


                                       2


<PAGE>   7


5.  CAN  I  CONTINUE TO EFFECT A CASHLESS EXERCISE AND OPEN MARKET  SALE
    DURING  THE  PERIOD OF THE TENDER OFFER?  Beginning August 25,  1994  the
    Treasury  Department stopped facilitating the cashless exercise and  sale
    program.   This administrative procedure which was implemented to  assist
    employees  who  wished to exercise their options and sell immediately  on
    the  open  market has been temporarily discontinued during the period  of
    the  tender  offer  while attention is being directed towards  processing
    the  tender  offer. The Company believes that by successfully tendering
    into the  Tender Offer  employees who exercise options during this period
    are  likely  to receive  a higher price than if they sold into the open
    market.   On  the other hand, an option holder who believes that the
    discontinuance of  the cashless  exercise  and sale program imposes an
    intolerable  hardship  on him/her should contact the Treasury Department
    directly.

         You will receive the proceeds if your Option Shares are purchased in
    the Tender Offer around the 1st of October.

6.  WHICH  DOCUMENTS DID I RECEIVE IN THE TENDER MATERIALS AND WHAT IS  THEIR
    PURPOSE?  You received the following materials in this mailing:

           -  PRESIDENT'S LETTER. [white]   This announces the Offer.

    -   OFFER  TO  PURCHASE DATED AUGUST 25, 1994.  [white]    This  document
    describes the offer.  PLEASE READ IT CAREFULLY.

    -   LETTER  OF TRANSMITTAL. [blue]  This document is part of the  "Offer"
    and  therefore is being provided to you.  However, it does not apply  to,
    or   provide  detailed  instructions  for,  exercising  your  option   or
    tendering Option Shares.  Do not use it to tender Option Shares.  If  you
    actually  hold Shares (outside of the Saving Plus Plan), please refer  to
    the Letter of Transmittal for use in tendering those Shares.

    -    LETTER FROM THE COMPANY'S TREASURY DEPARTMENT.   [white]  This
    transmits information about your options, their exercise and the
    tender offer.

    -  NOTICE OF INSTRUCTION.  [pink] This is the form to be used to exercise
    your option and tender the Shares.


                                       3


<PAGE>   8


    YOU  MUST  COMPLETE,  SIGN  AND  MAIL  THIS  DOCUMENT  TO  THE  MILLIPORE
    CORPORATION TREASURY DEPARTMENT IF YOU WISH TO EXERCISE YOUR OPTIONS  AND
    TENDER  YOUR SHARES (THE "OPTION SHARES").  THIS DOCUMENT IS POSTED  WITH
    YOUR NAME, USE IT TO DIRECT A TENDER OF YOUR SHARES.

    -   Reply Envelope. [white]  A preaddressed, postage prepaid envelope for
    your reply.

    -   Questions  and  Answers on Stock Option Holders'  Tender  Rights  and
    Procedures.  [white booklet] You are reading this document.

7.  HOW  DO  I  DIRECT THE COMPANY'S TREASURY DEPARTMENT?  The only way  that
    you  can tender  Option  Shares is by completing the Notice of Instruc-
    tion  Form [pink]   as   described,  signing  and  returning  it  to
    the  Millipore Corporation Treasury Department which will process your
    instructions.

    NOTICE  OF  INSTRUCTIONS FORM MUST BE RECEIVED BY  MILLIPORE  CORPORATION
    TREASURY  DEPARTMENT  BEFORE  5:00 P.M., BOSTON  TIME  (EASTERN  DAYLIGHT
    TIME),  ON SEPTEMBER 19, 1994.  YOU MUST SIGN AND COMPLETE THE  FORM  FOR
    YOUR DIRECTION TO BE VALID.

    TO  PROPERLY  DIRECT  THE  TREASURY DEPARTMENT  WITH  RESPECT  TO  OPTION
    EXERCISES  AND  SUBSEQUENT TENDER OF OPTION SHARES  ON  YOUR  BEHALF  YOU
    MUST:

    -   INSTRUCTIONS.  Read carefully and follow exactly the instructions  in
    the  Letter  of Instructions from the Treasury Department and the  Notice
    Instructions  Form.   These  will tell you how  to  direct  the  Treasury
    Department regarding your Shares.

    -  FORM.  Complete the enclosed Notice of Instructions Form.

    -   SHARES.   Designate on the Notice of Instructions Form the number  of
    Shares (excluding fractional shares) you wish to be tendered.

    -   PRICE.  If, on the Notice of Instruction Form you select "Purchase
    Price" rather than checking a box with respect to a specific sale price,
    this will assure that your Option Shares will be purchased in the Offer,
    subject only to proration. IF YOU DO NOT EITHER SELECT A SINGLE PRICE OR
    CHECK "PURCHASE PRICE", YOUR OPTION SHARES WILL NOT BE TENDERED. YOU MAY
    ONLY CHECK ONE BOX.

    -   SIGNATURE.  You must sign the Notice of Instructions Form to complete
    your  instruction.  Unless you sign the Notice of Instructions Form, your
    direction cannot be honored and no option will be exercised.


                                       4


<PAGE>   9


    -   MAILING.  A preaddressed, postage prepaid [white] envelope  has  been
    enclosed  with your Tender materials.  Use this envelope to  return  your
    completed  Notice  Instructions Form if you  wish  to  have  your  option
    exercised and your Option Shares tendered.

    Please be precise in providing your instruction and please act PROMPTLY.

8.  HOW  DO  I SEND MY INSTRUCTION TO THE TREASURY DEPARTMENT?  Please return
    your  instructions PROMPTLY, recognizing the slow delivery time  inherent
    in  the  U.S.  mail today.  You may hand deliver or mail your  Notice  of
    Instructions   Form   to  the  Company's  Treasury  Department   in   the
    preaddressed,  postage prepaid envelope that has been provided  for  your
    reply  or  send  it  by  an  alternate faster means  (such  as  overnight
    courier).  DO  NOT  DELIVER YOUR INSTRUCTIONS  TO  YOUR  HUMAN  RESOURCES
    DEPARTMENT OR TO YOUR BENEFIT ADMINISTRATOR.

9.  MUST  I  PROVIDE  DIRECTIONS TO THE TREASURY DEPARTMENT?   You  must
    respond  IF  you  wish  the Treasury Department  to  tender  your  Option
    Shares.   Do  not respond if you do not wish to exercise your options  or
    tender your Option Shares.

10. IN  ADDITION TO MY STOCK OPTIONS WHAT IF I HAVE SHARES IN MY SAVINGS
    PLUS  PLAN  ACCOUNT  AND/OR HOLD SHARES OF MILLIPORE  CORPORATION  COMMON
    STOCK  OUTSIDE  OF  THE SAVINGS PLUS PLAN?  If you  have  Shares  in  the
    Savings  Plus  Plan and have actual Shares in your possession  (or  at  a
    brokerage  firm), you will receive two or more sets of Tender  materials.
    You  should be careful to follow the directions that apply to  each  kind
    of Shares.

11. WHO WILL KNOW WHETHER I TENDERED OPTION SHARES?  Your directions  to
    the  Treasury Department ARE CONFIDENTIAL.  Individual instructions  will
    only  be  disclosed  to  the recordkeeper as necessary  to  complete  the
    Tender.

12. CAN I CHANGE MY MIND AND WITHDRAW OPTION SHARES THAT I DIRECTED TO BE
    TENDERED?  Yes, but only if you perform the following steps:


                                       5


<PAGE>   10


     -  You  must  send  a signed notice of withdrawal  to  the  Treasury
     Department,  c/o  The  First National Bank of  Boston,  P.O.  Box  1889,
     Boston, MA.

     -  The  notice of withdrawal must be in writing.  You may  fax  your
     notice  of withdrawal to The First National Bank of Boston at fax number
     (617)575-2700.

     - the notice of withdrawal must state your name, the number of Option
     Shares  that  you  wish  to withdraw from the offer  and  that  you  are
     withdrawing Option Shares that you instructed the Treasury Department to
     tender on our behalf.

     -  The  notice of withdrawal must be received by The First  National
     Bank of Boston before Midnight, Boston Time on September 22, 1994.

     If  you  wish  to  withdraw Option Shares and re-tender  them  at  a
     different  price or prices, please attach your notice of  withdrawal  to
     the Notice of Instructions Form used to re-tender such Shares.


13.  CAN I RE-TENDER MY PLAN SHARES?  Yes.  If you wish to re-tender your
     Option  Plan  Shares  you must complete another Notice  of  Instructions
     Form and submit it to the Company's Treasury Department by 5:00 p.m. on
     September 19, 1994. You may obtain another copy by calling the special
     voice mailbox. See Question #17.

14.  WILL  ALL  OPTION  SHARES THAT I DIRECT THE TREASURY  DEPARTMENT  TO
     TENDER  BE  PURCHASED?   This depends upon the total  number  of  Shares
     entered  and  the price(s) you select.  If you tender some Shares  at  a
     price  equal  to  or below the "Purchase Price" at least  some  of  your
     Shares  will  be  purchased.   If  more  Shares  are  tendered  by   all
     shareholders at or below the Purchase Price than the Company had offered
     to  purchase, a pro rata portion of the Shares that you directed  to  be
     tendered  will  be  purchased.  However,  if  you  direct  the  Treasury
     Department  to tender at a price which turns out to be higher  than  the
     Purchase  Price, the Company will not accept these Shares.  See Question
     #3 for a description of how the Purchase Price will be determined.

     If Option Shares are not accepted then the Option will be deemed not
     to have been exercised with respect to these shares.


                                       6


<PAGE>   11


15.  HOW WILL I KNOW IF MY OPTION SHARES HAVE BEEN PURCHASED?  After  the
     Offer Period expires all Tender directions will be tabulated, which  may
     take  up  to  seven New York Stock Exchange Trading days.  Soon
     thereafter you will be  advised  of  the number,  if  any,  of  your
     Option Shares which were  accepted  and  the Purchase Price determined
     under the Tender.

16.  WILL  I BE TAXED ON ANY PROCEEDS RECEIVED IN 1994 FROM THE MILLIPORE
     STOCK THAT IS TENDERED?  Yes.  you will be taxed as if you exercised and
     sold  an  NQO.   You will not be entitled to the special  tax  treatment
     accorded   incentive  stock  options.   See  letter  from  the  Treasury
     Department  which  accompanied  the  Tender  offer  documents  for  more
     detailed tax information.

                    C.  ADMINISTRATION OF STOCK OPTION PLAN
                              DURING TENDER OFFER

                             ADDITIONAL INFORMATION

17.  WHAT DO I DO IF I HAVE ANY QUESTIONS ABOUT THE TENDER OFFER?  If you
     have  questions about the operation of the Tender Offer or need help  in
     properly responding to the Offer, you may call the special voice mailbox
     (extension 2379 in Bedford) established for questions at any time.   You
     will be asked to leave your name and a telephone number at which you can
     be contacted.

                                  * * * * * *

This document must be read together  with  the Offer to Purchase and Letter
of Transmittal.  Those documents constitute  the Offer and will be controlling.


August 25, 1994

                                      7

<PAGE>   1
                                                                    EXHIBIT (g)

Consolidated Statements of Income (From 1993 Form 10-K, pages 35-50 of Annual
Report to Stockholders)

Millipore Corporation

<TABLE>
<CAPTION>
Year ended December 31
(In thousands except per share data)                   1993         1992        1991
<S>                                                 <C>          <C>         <C>
Net sales                                           $ 445,366    $ 427,188   $ 415,075
Cost of sales                                         193,575      195,462     194,557
     Gross profit                                     251,791      231,726     220,518
Selling, general and
  administrative expenses                             145,647      142,701     129,593
Research and development expenses                      34,952       32,953      32,633

     Operating income                                  71,192       56,072      58,292
Loss on sale of business                                    -       (2,415)          -
Interest income                                         4,069        6,888       6,182
Interest expense                                      (12,038)     (14,692)    (13,984)

     Income from continuing
       operations before income taxes                  63,223       45,853      50,490
Provision for income taxes                             14,225       10,317      14,570

Income from continuing operations before
  extraordinary item and cumulative effect of
  change in accounting principle                       48,998       35,536      35,920

Earnings (loss) from discontinued operations          (10,851)       2,715      18,645

Income before extraordinary item and
  cumulative effect of change in accounting
  principle                                            38,147       38,251      54,565

Extraordinary item - loss on early
  extinguishment of debt                                3,544            -           -

Cumulative effect of change in accounting
  for postretirement benefits other
  than pensions                                             -        5,068           -

     Net income                                     $  34,603    $  33,183   $  54,565
Income per share
     Income from continuing operations              $    1.75    $    1.26   $    1.27
     Net income per common share                    $    1.24    $    1.17   $    1.93
Weighted average common
  shares outstanding                                   27,951       28,242      28,294
</TABLE>

The accompanying notes are an integral part of the consolidated financial
statements.
                                    Page 35
<PAGE>   2
Consolidated Balance Sheets

Millipore Corporation

<TABLE>
<CAPTION>
                                                                   December 31
(In thousands)                                                   1993       1992
<S>                                                             <C>        <C>
Assets
Current assets:
     Cash                                                       $  2,140   $  1,915
     Short-term investments                                       38,502     68,536
     Accounts receivable (less allowance for
       doubtful accounts of $3,063 in 1993
       and $1,752 in 1992)                                        99,655     94,627
     Inventories                                                  65,187     72,279
     Other current assets                                         12,790     13,915
     Net current assets of discontinued operations               138,687    147,480

     Total current assets                                        356,961    398,752
Property, plant and equipment, net                               194,895    195,070
Intangible assets (less accumulated amortization
 of $1,169 in 1993 and $911 in 1992)                               2,769      1,670
Other assets                                                      48,332     45,957
Net long-term assets of discontinued operations                   99,647    106,194

Total assets                                                    $702,604   $747,643

Liabilities and Shareholders' Equity
Current liabilities:
     Notes payable and current portion of long-term debt        $ 51,420   $112,064
     Accounts payable and accrued expenses                        57,505     51,465
     Dividends payable                                             3,921      3,633
     Accrued retirement plan contributions                         2,547      2,706
     Accrued and deferred income taxes payable                     4,894      5,431

     Total current liabilities                                   120,287    175,299
Long-term debt                                                   102,047    103,240
Other liabilities                                                 19,116     16,269
Commitments and contingent liabilities                                 -          -
Shareholders' equity:
     Common stock, par value $1.00 per share, 80,000 shares
       authorized.  28,344 shares issued
       as of December 31, 1993 and 1992                           28,344     28,344
     Additional paid-in-capital                                   16,803     16,524
     Retained earnings                                           434,988    416,563
     Translation adjustments                                      (7,624)     4,028
                                                                 472,511    465,459
     Less: Treasury stock at cost, 341 and 370 shares as of
      December 31, 1993 and 1992, respectively                    11,357     12,624

     Total shareholders' equity                                  461,154    452,835

Total liabilities and shareholders' equity                      $702,604   $747,643
</TABLE>

The accompanying notes are an integral part of the consolidated financial
statements.
                                    Page 36
<PAGE>   3

Consolidated Statements of Shareholders' Equity

Millipore Corporation

<TABLE>
<CAPTION>
Year ended December 31, 1991, 1992 and 1993
(In thousands)
                                                 Additional                                                 Total
                                     Common Stock  Paid-in   Retained  Translation    Treasury   Stock   Shareholders'
                              Shares  Par Value    Capital   Earnings  Adjustments    Shares     Cost       Equity
<S>                           <C>      <C>         <C>       <C>         <C>           <C>      <C>        <C>
Balance at January 1, 1991    28,344   $28,344     $14,219   $360,954    $24,984       (107)    $(1,493)   $427,008
Net income                                          54,565                           54,565
Cash dividends
 declared, $0.47 per share                                                          (13,098)    (13,098)
Treasury stock acquired                                                                (391)    (15,938)    (15,938)
Stock options exercised                                        (3,517)                  384      13,444       9,927
Employees' stock
 purchase plan proceeds                                          (330)                   45       1,621       1,291
Incentive plan awards                                              69                    69       2,366       2,435
U.S. tax benefit
 from stock plan activity                                                             1,524       1,524
Translation adjustments                                                                          (3,218)     (3,218)
Balance at December 31, 1991  28,344   $28,344     $15,743   $398,643    $21,766          0          $0    $464,496
Net income                                                                                       33,183      33,183
Cash dividends declared,
  $0.51 per share                                                                               (14,376)    (14,376)
Treasury stock acquired                                                                (484)    (16,777)    (16,777)
Stock options exercised                                          (889)                  111       4,033       3,144
Employees' stock
  purchase plan proceeds                                            2                     3         120         122
U.S. tax benefit from
  stock plan activity                                                                               781         781
Translation adjustments                                                                         (17,738)    (17,738)
Balance at December 31, 1992   28,344  $28,344     $16,524   $416,563    $ 4,028       (370)   $(12,624)   $452,835
Net income                                                                                       34,603      34,603
Cash dividends declared,
  $0.55 per share                                                                               (15,396)    (15,396)
Treasury stock acquired                                                                (112)     (3,427)     (3,427)
Stock options exercised                                          (899)                  104       3,468       2,569
Employees' stock
  purchase plan proceeds                                          (32)                   10         353         321
Incentive plan awards                                             161                    22         721         882
Stock Awards                                                      (12)                    5         152         140
U.S. tax benefit
  from stock plan activity                                                                          279         279
Translation adjustments                                                                         (11,652)    (11,652)
Balance at December 31, 1993   28,344  $28,344     $16,803   $434,988    $(7,624)      (341)   $(11,357)   $461,154
</TABLE>

The accompanying notes are an integral part of the consolidated financial
statements.
                                    Page 37

<PAGE>   4
Consolidated Statements of Cash Flows

Millipore Corportion

<TABLE>
<CAPTION>
    Year ended December 31
    (In thousands)                                       1993      1992      1991
    <S>                                                 <C>       <C>       <C>
    Cash Flows From Operating Activities:

    Net income                                          $34,603   $33,183   $54,565
    Adjustments to reconcile net income to
     net cash provided by continuing operations
         Net loss (income) from discontinued
          operations                                     10,851    (2,715)  (18,645)
         Depreciation and amortization                   23,775    23,507    20,905
         Deferred income tax provision                   (1,745)      225    10,731
         Extraordinary item-loss on
            extinguishment of debt                        3,544         -         -
         Change in operating assets and liabilities:
          (Increase) decrease in accounts receivable     (5,440)    8,348   (10,939)
          Decrease (increase) in inventories              6,398    (8,269)    2,250
          Decrease (increase) in other current assets       763     1,276    (2,251)
          (Increase) in other assets                     (1,981)  (16,003)   (5,181)
          Increase (decrease) in accounts payable
            and accrued expenses                          3,740    (2,475)   (5,608)
          (Decrease) increase in accrued retirement plan
            contributions                                  (104)      600       (12)
          (Decrease) increase in accrued
            income taxes payable                         (1,002)   (2,111)    3,474
          Increase - Other                                   53    11,898       585

         Net cash provided by continuing operations      73,455    47,464    49,874
         Net cash provided by discontinued operations     8,708     4,691     9,842

    Net cash provided by operating activities            82,163    52,155    59,716

    Cash Flows From Investing Activities:
    Additions to property, plant and equipment, net     (24,469)  (33,906)  (40,660)
    Net investing activities of
     discontinued operations                             (9,357)  (11,018)   (7,668)

    Net cash used for investing activities              (33,826)  (44,924)  (48,328)

    Cash Flows From Financing Activities:
    Treasury stock acquired                              (3,427)  (16,777)  (15,938)
    Issuance of treasury stock under stock plans          3,912     3,266    13,653
    (Decrease) increase in short-term debt              (59,887)   20,137    26,548
    (Decrease) in long-term debt                         (1,222)   (2,988)   (1,320)
    Dividends paid                                      (15,108)  (14,093)  (12,814)

    Net cash (used for) provided by financing
     activities                                         (75,732)  (10,455)   10,129
    Effect of foreign exchange rates on cash and
     short-term investments                              (2,414)   (2,765)     (442)

    Net (decrease) increase in cash and short-term
     investments                                        (29,809)   (5,989)   21,075
    Cash and short-term investments on January 1         70,451    76,440    55,365
    Cash and short-term investments on
     December 31                                        $40,642   $70,451   $76,440
</TABLE>

    The accompanying notes are an integral part of the consolidated financial
    statements.

                                    Page 38
<PAGE>   5
    NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
    (In thousands except per share data)

    NOTE A - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

        PRINCIPLES OF CONSOLIDATION

    The consolidated financial statements include the accounts of the Company
    and its subsidiaries, all of which are wholly owned.  All material
    intercompany balances and transactions have been eliminated.

        TRANSLATION OF FOREIGN CURRENCIES

    For most of the Company's foreign subsidiaries, assets and liabilities are
    translated at exchange rates prevailing on the balance sheet date, revenues
    and expenses are translated at average exchange rates prevailing during the
    period, and elements of shareholders' equity are translated at historical
    rates. Any resulting translation gains and losses are reported separately in
    shareholders' equity. For the Company's subsidiary in Brazil, where
    inflation is very high, the translation is the same except that inventories,
    cost of sales, property, plant and equipment, and depreciation are
    translated at historical rates. Resulting translation gains and losses for
    this subsidiary are included in income. Net losses from foreign currency
    transactions and translations of $867 in 1993, $1,767 in 1992, and $715 in
    1991 were included in selling, general and administrative expenses.

        SHORT-TERM INVESTMENTS

    Short-term investments consist primarily of government securities and
    certificates of deposit and are carried at cost plus accrued interest, which
    approximates market value.
 
        INVENTORIES

    The Company values all of its inventories at the lower of cost or market,
    principally on a last-in, first-out (LIFO) basis. The remaining inventories
    are valued on a first-in, first-out (FIFO) basis.

        PROPERTY, PLANT AND EQUIPMENT

    Property, plant and equipment is recorded at cost. Expenditures for
    maintenance and repairs are charged to expense while the costs of
    significant improvements are capitalized. Depreciation on assets acquired
    before January 1, 1989 generally is provided using accelerated methods over
    the estimated useful lives of the assets. Assets acquired after January 1,
    1989 primarily are depreciated using straight-line methods. Upon retirement
    or sale, the cost of assets disposed and the related accumulated
    depreciation are eliminated and related gains or losses reflected in income.

        INTANGIBLE ASSETS

    Intangible assets consist primarily of licenses.  Intangible assets are
    amortized on a straight-line basis over appropriate periods not exceeding 
    10 years.

        INCOME TAXES

    In 1992, the Company adopted the provisions of SFAS #109 "Accounting for
    Income Taxes."  As discussed more fully in Note H, deferred income taxes
    under SFAS #109 are determined on the liability method. The Company
    provides deferred income taxes on the unremitted earnings of foreign and
    Puerto Rican subsidiaries which are expected to be repatriated.

        TREASURY STOCK

    Treasury stock is recorded at its cost on the date acquired and is relieved
    at its weighted average cost upon reissuance. The excess of the cost over
    proceeds of treasury stock reissued is charged to retained earnings.

        NET INCOME PER COMMON SHARE

    Net income per common share is calculated by dividing the net income for 
    the period by the weighted average number of common shares outstanding 
    for the period.

        POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

    In 1992, the Company adopted the provisions of SFAS #106 "Employers'
    Accounting for Postretirement Benefits Other than Pensions." This new
    standard, discussed more fully in Note L requires that the expected cost of
    retiree health benefits be expensed during the years employees render
    service rather than the Company's prior practice of recognizing these costs
    on a cash basis.

        RECLASSIFICATIONS

    Certain reclassifications have been made to prior years' financial
    statements to conform with the 1993 presentation.
                               Page 39
<PAGE>   6
    NOTE B - DISCONTINUED OPERATIONS

    On November 11, 1993, the Company's Board of Directors approved a plan to
    divest operations of the Company's Instrumentation Divisions, which serve
    primarily chromatography and bioscience markets.  The operating results of
    these businesses, which have been classified as discontinued operations in
    the accompanying consolidated financial statements, are summarized as
    follows:


<TABLE>
<CAPTION>
                                          1993       1992      1991
                                        through
                                       11/11/93
    <S>                                <C>         <C>        <C>
    Net sales                          $279,303    $349,813   $346,314
    Pre-tax income (loss)              $(14,001)     $5,632    $26,226
    Provision (credit)
      for income taxes                   (3,150)      1,267      7,581
    Cumulative effect of change
     in accounting for post-
     retirement benefits                      -       1,650         -
    Net income (loss)                 $ (10,851)    $ 2,715   $ 18,645
    Earnings (loss) per share         $   (0.38)    $  0.10   $   0.66
</TABLE>

    The operating results for 1993 are for the period ended November 11, 1993,
    the date the divestiture plan was approved.  In the first quarter of 1993,
    the Company recorded a restructuring charge of $13.0 million to cover costs
    associated with reorganizing and restructuring the Company's chromatography
    division into more market-focused customer-oriented business units.  The
    restructuring charge covered the cost of severance and other personnel
    related items resulting from the reorganization.

    The operating results from November 11, 1993 to the date of divestiture 
    will be deferred until the divestiture is completed.  The Company expects 
    to realize a net gain in 1994 upon the sale of these businesses.

    Net current and long-term assets of discontinued operations consist
    primarily of accounts receivable, inventory, property, plant and equipment,
    intangibles, and accounts payable, and have been classified separately in
    the accompanying consolidated balance sheets.



    Note C - Inventories

    Inventories at December 31 consisted of the following:
<TABLE>
<CAPTION>
                                             1993         1992
    <S>                                  <C>          <C>
    Raw materials                        $ 18,782     $ 17,778
    Work in process                         7,852        9,004
    Finished goods                         38,553       45,497
                                         $ 65,187     $ 72,279
</TABLE>

    The value of inventories determined using the LIFO cost method was $47,097
    or 72 percent of the total at December 31, 1993 and $50,793 or 70 percent
    of the total at December 31, 1992.  If these inventories had been valued
    using the FIFO cost method, they would have been $48,847 at December 31,
    1993 and $53,244 at December 31, 1992.


    NOTE D - PROPERTY, PLANT AND EQUIPMENT

    Property, plant and equipment at December 31 consisted of the following:

<TABLE>
<CAPTION>
                                             1993         1992
    <S>                                 <C>          <C>
    Land                                $   6,966    $   6,939
    Leasehold improvements                 16,108       11,669
    Buildings and improvements            108,054      104,041
    Production and other equipment        206,207      183,179
    Construction in progress               20,631       35,352
                                          357,966      341,180
    Less: accumulated depreciation and
          amortization                    163,071      146,110

                                       $  194,895   $  195,070
</TABLE>

                                    Page 40

<PAGE>   7
    NOTE E - NOTES PAYABLE AND CURRENT PORTION OF LONG-TERM DEBT

    Short-term borrowings and related lines of credit at December 31 are
    summarized as follows:
<TABLE>
<CAPTION>
                                                          1993        1992
    <S>                                                 <C>         <C>
    Notes payable and current portion of
    long-term debt:
       Notes payable                                    $ 50,802    $111,489
       Current portion of long-term debt                     618         575
                                                        $ 51,420    $112,064
    Unused lines of credit                              $240,755    $192,347
    Average amount outstanding at month-end
    during the year                                     $ 94,465    $132,696
    Maximum month-end amount outstanding
     during the year                                    $129,332    $182,439
    Weighted average interest rate during the year           4.3%        5.1%
    Weighted average interest rate at year-end               4.5%        4.7%
</TABLE>

    Notes payable generally consist of renewable, uncollateralized borrowings
    under lines of credit that are denominated in various currencies and bear
    interest at prevailing rates.

    NOTE F - LONG-TERM DEBT

    Long-term debt at December 31 consisted of the following:
<TABLE>
<CAPTION>
                                                                   1993       1992
    <S>                                                         <C>        <C>
    Notes payable with interest rates
     of 9.2% due in 1998                                        $100,000   $100,000
    Other notes payable with average interest of 5.9% in
     1993 and 7.0% in 1992, due through 2005                       2,665      3,815
                                                                 102,665    103,815
    Less: Current portion                                           (618)      (575)
    Long-term debt                                              $102,047   $103,240
</TABLE>

    In the fourth quarter of 1993, the Company entered into an agreement to
    retire the $100,000 notes payable before their call date of March 30, 1995.
    Accordingly, the Company recorded an extraordinary charge of $5,906 ($3,544
    net of income taxes or $0.13 per share) in December, 1993 to reflect the
    cost of extinguishing the notes. In March, 1994, the Company issued
    $100,000 of 6.78% notes due in 2004. Interest is payable semi-annually on
    these notes beginning in September 1994.

         Long-term debt, including current portion and after consideration of
    the events discussed above, matures as follows:

<TABLE>
    <S>                                                <C>
    Year ended December 31, 1994                       $    618
    Year ended December 31, 1995                            562
    Year ended December 31, 1996                            454
    Year ended December 31, 1997                            247
    Year ended December 31, 1998                            249
    Years subsequent to December 31, 1998               100,535
</TABLE>

         Certain notes contain covenants relating to maintenance of current
    asset levels, cash dividends and limitations on long-term debt. The Company
    is in compliance with all such covenants.

         The Company capitalized interest costs associated with the construction
    of certain assets of $1,301 in 1993, $1,561 in 1992, and $1,645 in 1991.
    Interest paid on debt during 1993, 1992, and 1991 amounted to $13,356,
    $16,637, and $15,263, respectively.

         The Company had partially hedged its foreign currency net asset
    exposure by entering into a currency swap which was to mature in 1995.
    Under the terms of the original swap, the Company exchanged $100,000 of
    dollar debt service obligations for foreign obligations of 9,936,000 yen
    and 33,193 DM.  The Company's foreign currency obligations had an effective
    weighted average interest rate of 6.02 percent in 1993. The effects of
    foreign currency exchange rate fluctuations resulting from these swap
    agreements are included in translation adjustments and in transaction
    gains/losses.  Unrealized losses on these swap agreements of $8,020 at
    December 31, 1993 and $92 at December 31, 1992 are included in other assets
    in the consolidated balance sheets.

         In January, 1994, the Company closed out the yen denominated swap and
    simultaneously exchanged $80,000 of dollar debt service obligation for a yen
    denominated obligation of 8,760,000 yen, which bears interest at a rate of
    4.49 percent.  The swap matures in 2004.

                                    Page 41
<PAGE>   8
    NOTE G - FOREIGN EXCHANGE

    In the fourth quarter of 1992, the Company entered into forward exchange
    contracts to reduce the impact of foreign currency fluctuations on certain
    transactions in 1993. A gain of $2.3 million was realized on these
    contracts and was recorded in cost of sales in 1993. In the fourth quarter
    of 1993, the Company has again entered into forward exchange contracts to
    reduce the impact of foreign currency fluctuations on certain transactions.
    The gains or losses on these contracts will be included in income when the
    operating revenues and expenses related to the underlying transactions are
    recognized.

    Contracts open at December 31, 1993, aggregating $85,000, have an unrealized
    gain of $1,000. All open contracts have maturities which do not exceed
    fifteen months.


    NOTE H - INCOME TAXES

         The Company has provided for income taxes on both continuing and
    discontinued operations according to the provisions of SFAS #109 "Accounting
    for Income Taxes" which the Company adopted in 1992.  Data related to the
    provisions for income taxes are summarized as follows:


<TABLE>
<CAPTION>
                                                          1993       1992      1991
    <S>                                                 <C>        <C>       <C>
    Domestic and foreign income before income taxes:
              Domestic                                  $16,690    $27,077   $51,530
              Foreign                                    32,532     24,408    25,186
                                                         49,222     51,485    76,716
    Less: (income) loss from discontinued
          operations                                     14,001     (5,632)  (26,226)
    Income from continuing operations before
     income taxes                                       $63,223    $45,853   $50,490

    Domestic and foreign provisions for income taxes:
              Domestic                                  $(2,781)   $ 2,842   $ 8,589
              Foreign                                    13,356      8,242    13,063
              State                                         500        500       499
                                                         11,075     11,584    22,151
    Less:  portion applied to discontinued
           operations                                     3,150     (1,267)   (7,581)
                                                        $14,225    $10,317   $14,570

    Current and deferred components of the provision
      for income taxes:
              Current                                   $12,820    $11,359   $11,420
              Deferred                                   (1,745)       225    10,731
                                                        $11,075    $11,584   $22,151

    Components of the deferred income tax provisions:
              Intercompany and inventory-related
               transactions                             $(2,241)    $2,542      $545
              Unremitted foreign earnings                     -          -      (802)
              Depreciation                               (1,232)      (111)      530
              Costs related to business dispositions          -          -       438
              Restructuring charge                            -        576     8,813
              Provision for postretirement benefits other
               than pensions                               (419)      (555)        -
              Other                                       2,147     (2,227)    1,207
                                                        $(1,745)      $225   $10,731
</TABLE>

    Summary  of  the differences between the Company's consolidated  effective
    tax rate and the United States statutory federal income tax rate:

<TABLE>
                                                       <C>             <C>       <C>
    U.S. statutory income tax rate                      35.0%          34.0%     34.0%
    Puerto Rico tax rate benefits                      (11.9)          (9.8)     (8.0)
    Excess foreign over U.S. tax rate                    5.6              -       6.4
    State income tax, net of federal income tax
     benefit                                              .7             .6        .4
    Foreign Sales Corporation income
     not taxed                                          (4.6)          (4.1)     (2.8)
    U.S. tax credits                                       -             -       (1.8)
    Other                                               (2.3)           1.8        .7
    Effective tax rate applicable
     to operations                                      22.5%          22.5%     28.9%
</TABLE>

                                    Page 42
<PAGE>   9


    Net deferred tax assets result from temporary differences in the recognition
    of revenues and expenses for financial statement and income tax purposes.
    Components of the net deferred tax assets are as follows:

<TABLE>
<CAPTION>
                                         1993              1992
    <S>                                <C>               <C>   
    Intercompany and inventory         $18,698           $16,457
    related transactions

    Postretirement benefits other
     than pensions                       4,435             4,016

    Tax credits (including foreign tax
     credits on unremitted earnings)    21,800            17,640

    U.S. net operating loss
     carryforwards                      14,001            12,000

    Other, net                           1,248            (4,183)
                                        60,182            45,930

    Valuation allowance                (19,390)          (15,526)

    Net deferred tax asset            $ 40,792          $ 30,404
</TABLE>


    Net deferred tax assets are classified in other assets in the balance sheet.
    The valuation allowance is provided primarily against foreign tax credits
    which can be utilized against future taxable income in the United States
    after the utilization of other carryforwards and expire no later than 1996.

    The reduction in tax expense attributable to tax exemptions on the Company's
    operations in Puerto Rico was $5,843 in 1993, $5,035 in 1992, and $6,275 in
    1991 or $.21, $.18, and $.22 per share, respectively.  Tax exemptions
    relating to these operations are effective through 2004. Income taxes paid
    during 1993, 1992, and 1991 were $15,185, $18,634 ,and $10,753 respectively.

    NOTE I - LEGAL PROCEEDINGS

    The Company has been notified in a number of instances that the United 
    States Environmental Protection Agency (EPA) has determined that a release 
    or a substantial threat of a release of hazardous substances (Release) as 
    defined in Section 101 of the Comprehensive Environmental Response 
    Compensation and Liability Act of 1980 as amended by the Superfund 
    Amendments and Reauthorization Act of 1986 (the so-called "Superfund" law) 
    has occurred at certain sites to which chemical wastes generated by the 
    manufacturing operations of the Company have been sent. These notifications 
    typically also allege that the Company may be a responsible party under 
    the law with respect to any remedial action needed to control or prevent 
    any such Release. Under the law the EPA may undertake remedial action and 
    responsible parties may be liable, without regard to fault or negligence, 
    for all costs incurred. In several of these instances the EPA has issued a 
    proposal for remedial action it considers necessary to protect the 
    environment. In each instance the Company was only one of a large number 
    of corporations and entities which received such notification, and 
    anticipates that any ultimate liability for remedial costs will be shared 
    by others. In 1992, the EPA unexpectedly proposed settlements for several 
    of these sites. Based on those proposed settlements and all other
    information available to management, the Company recorded a provision of 
    $5,800 against cost of sales which, in management's best estimate will be 
    sufficient to satisfy all know claims by the EPA. The Company has paid a 
    total of $13,900 to date to satisfy environmental claims. The aggregate of 
    further potential liabilities is not expected to have a material adverse 
    effect on the Company's financial condition.

    Eastern Enterprises has filed a lawsuit against the Company alleging
    misrepresentations made in connection with its 1989 purchase of the 
    Company's Process Water Division. The Company believes it has meritorious 
    defenses against all claims. Although the Company is unable to predict 
    with certainty the outcome of this matter, its ultimate disposition is not 
    expected to have a material adverse effect on the Company's financial 
    condition.

    NOTE J - LEASES

    Lease agreements cover sales offices, warehouse space, computers and 
    automobiles. These leases have expiration dates through 2026.
    Certain land and building leases contain renewal options for periods
    ranging from five to ten years and purchase options at fair market
    value. Rental expense was $10,878 in 1993, $8,880 in 1992, and
    $7,706 in 1991. At December 31, 1993 future minimum rents payable
    under noncancelable leases with initial terms exceeding one year
    were as follows:


<TABLE>
         <S>         <C>
         1994        $10,615
         1995          9,056
         1996          6,851
         1997          6,146
         1998          5,142
         1999 - 2026  48,617
</TABLE>

                                    Page 43
<PAGE>   10

    NOTE K - STOCK PLANS

    STOCK OPTION PLAN

    Under the Company's Combined Stock Option Plan, stock options to purchase
    Millipore common stock may be granted to employees.  The plan provides that
    the option price per share may not be less than the fair market value of the
    stock at the time the option is granted and that options must expire not
    later than 10 years from the date of grant. Plan data are summarized as
    follows:
<TABLE>
<CAPTION>
                                                   1993     1992    1991
    <S>                                          <C>      <C>     <C>
    Option shares:
       Outstanding at beginning of period         2,431    2,207   2,136
       Issued during period                         516      510     527
       Exercised during period                     (100)    (111)   (384)
       Canceled during period                      (127)    (175)    (72)
       Outstanding at end of period               2,720    2,431   2,207
    Exercisable at end of period                  1,536    1,254   1,073
    Shares available for granting of options
     at end of period                               879      270     604
    Average price of outstanding options
     at end of period                            $33.34   $32.70  $32.14
    Average price of exercised options
     during the period                           $24.51   $28.22  $25.95
</TABLE>

    Shares available include 1,000 shares authorized by the Board of Directors
    in December, 1993 subject to shareholder approval at the Annual Meeting in
    April, 1994.

    NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN

    In 1990, a stock option plan for Non-Employee Directors was approved by the
    Company's shareholders.  Under this plan, stock options to purchase up to
    100 shares of Millipore common stock may be granted to non-employee
    directors of the Company.  The plan provides that the option price per
    share may not be less then the fair market value of the stock at the time
    the option is granted.  At December 31, 1993, 59 options have been issued
    and 54 are outstanding.

    EMPLOYEES' STOCK PURCHASE PLAN

    Under the Company's Employees' Stock Purchase Plan, all employees of the
    Company and its subsidiaries who have 90 days continuous service prior to
    the beginning of the plan year, May 1, may purchase shares of Millipore
    common stock by payroll deduction. The purchase price per share during the
    plan year is the lesser of the fair market value of the common stock at the
    time of purchase or on May 1.

    In 1993, 1992, and 1991 shares issued under the plan were 10, 3, and 45,
    respectively. As of December 31, 1993, 117 shares of Millipore common stock
    were available for sale to employees under the plan.

    INCENTIVE PLAN FOR SENIOR MANAGEMENT

    Under this plan, Millipore common stock is awarded to key members of senior
    management at no cost to them. The stock cannot be sold, assigned,
    transferred or pledged during a restriction period which is normally four
    years. Shares are subject to forfeiture should employment terminate during
    the restriction period.

    The stock issued under the plan is recorded at its fair market value on the
    award date; the related deferred compensation is amortized to selling,
    general and administrative expenses over the restriction period.  At the
    end of 1993, 1992, and 1991, 133, 114, and 160 shares, respectively, were
    outstanding under the plan.  Plan expense was $833 in 1993, $924 in 1992,
    and $1,159 in 1991.  As of December 31, 1993, 78 shares of Millipore common
    stock were available for future awards under this plan.

    NOTE L - EMPLOYEE RETIREMENT PLANS

    PARTICIPATION AND SAVINGS PLAN

    The Millipore Corporation Employees' Participation and Savings Plan
    (Participation and Savings Plan), maintained for the benefit of all
    full-time U.S. employees, combines both a defined contribution plan
    (Participation Plan) and an employee savings plan (Savings Plan).
    Contributions to the Participation Plan are allocated among the U.S.
    employees of the Company who have completed at least two years of
    continuous service on the basis of the compensation they received during
    the year for which the contribution is made. The Savings Plan allows
    employees with one year of continuous service to make certain tax-deferred
    voluntary contributions which the company matches with a 25 percent
    contribution (50 percent contribution for employees with 10 years of
    service). Total expense under the Participation and Savings Plan was $8,679
    in 1993, $8,520 in 1992, and $8,143 in 1991.

    RETIREMENT PLAN

    The Company's Retirement Plan for Employees of Millipore Corporation
    (Retirement Plan) is a defined benefit plan for all U.S. employees which
    provides benefits to the extent that assets of the Participation Plan,

                                    Page 44
<PAGE>   11
    described above, do not provide guaranteed retirement income levels.
    Guaranteed retirement income levels are determined based on years of service
    and salary level as integrated with Social Security benefits. Employees are
    eligible under the Retirement Plan after one year of continuous service and
    are vested after 5 years of service.  For accounting purposes, the Company
    uses the projected unit credit method of actuarial valuation.  The actuarial
    method for funding purposes is the entry age normal method.  The Company
    contributes annually to the Retirement Plan, subject to Internal Revenue
    Service and ERISA funding limitations.  No contributions were required for
    1993 and 1992.

    The following table summarizes the funded status of the plan and amounts
    reflected in the Company's consolidated balance sheets at December 31. The
    projected benefit obligation was calculated using discount and investment
    return rates of 7.5 percent in 1993 and 8 percent in 1992, and a salary
    progression rate of 6 percent in both years.  Plan assets are invested
    primarily in common stock, mutual funds and money market funds.

<TABLE>
<CAPTION>
                                                                        1993       1992
         <S>                                                            <C>      <C>
         Actuarial present value of benefit obligations:
            Accumulated benefit obligation, including
            vested benefits of $2,804 on December 31, 1993 and
             $1,813 on December 31, 1992                                $ 2,983  $ 1,919

            Projected benefit obligation for service
             rendered to date                                           $(5,003) $(3,434)
            Plan assets at fair value                                     5,663    5,225
            Plan assets in excess of projected
             benefit obligation                                             660    1,791
            Unrecognized net actuarial loss                               3,069    1,653
            Unrecognized prior service cost                                 413      448
            Unrecognized net asset being amortized
             over 16.7 years                                               (747)    (831)
            Prepaid pension cost included in
              financial statements                                      $ 3,395  $ 3,061

         Net pension income includes the following components
            Service cost                                                $   393  $   323
            Interest cost                                                  (358)    (260)
            Return on plan assets                                           430      393
            Amortization and deferral                                      (131)     (46)
            Net pension income                                          $   334  $   410
</TABLE>

    POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

    The Company sponsors several unfunded defined benefit postretirement plans
    covering all U.S. employees.  The plans provide medical and life insurance
    benefits and are, depending on the plan, either contributory or
    non-contribu- tory.  As discussed in Note A, the Company adopted the
    provisions of SFAS #106 "Employers' Accounting for Postretirement Benefits
    Other Than Pensions" effective January 1, 1992.  In adopting this standard,
    the Company recorded in the first quarter of 1992, a one-time, non-cash
    charge against earnings from continuing operations of $7,678 before taxes
    and $5,068 after taxes, or $.19 per share.

         Net periodic postretirement benefit cost included the following
    components:
<TABLE>
<CAPTION>
                                                      1993           1992
    <S>                                            <C>            <C>
    Service cost-benefits attributed to service
     during the year                                $  754        $   834
    Interest cost on accumulated postretirement
     benefit obligation                                787            800
    Net amortization and deferral                     (15)             -
    Net periodic postretirement benefit cost        $1,526        $ 1,634
</TABLE>

    Summary information on the Company's plans as of December 31 is as follows:

<TABLE>
<CAPTION>
                                                         1993           1992
    <S>                                                <C>            <C>
    Accumulated postretirement benefit obligation:
    Retirees and dependents                            $ (3,520)      $ (3,702)
    Fully eligible active plan participants                (478)          (368)
    Other active plan participants                       (8,171)        (7,743)
    Accrued postretirement benefit cost                 (12,169)       (11,813)
    Unrecognized gain from past experience  different
      from that assumed and from changes in assumptions    (361)        -
    Accrued postretirement benefit obligation          $(12,530)      $(11,813)
</TABLE>

                                    Page 45
<PAGE>   12

    The discount rate used in determining the accumulated postretirement
    benefit obligation was 7.5 percent as of December 31, 1993 and 8 percent as
    of December 31, 1992.  The assumed health care cost trend rate used in
    measuring the accumulated postretirement benefit obligation was 12 percent
    in 1993, declining gradually to 6 percent through the year 2003 and
    remaining level thereafter.

    If the health care cost trend rate assumptions were increased by 1 percent,
    the accumulated postretirement benefit obligation as of December 31, 1993
    would be increased by $2,336 while the aggregate of the service and
    interest cost components of net periodic postretirement benefit cost for
    1993 would be increased by $343.

    NOTE M - BUSINESS SEGMENT INFORMATION

    INDUSTRY SEGMENTS

    The Company operates in one industry segment.  Using primarily membrane
    technology, the Company develops, manufactures and markets products used 
    for analysis and purification.

    GEOGRAPHICAL SEGMENTS

    The Company operates in the geographical segments indicated in the table
    below.  Sales are reflected in the segment from which the sales are made.
    The Americas segment includes North and South America.  The European region
    includes Western and Central Europe, Russia, the Middle East and Africa.
    The Asia/Pacific region includes Japan, Korea, Taiwan, Hong Kong, China,
    South- east Asia and Australia.  Transfer sales between geographical areas
    are generally made at a discount from list price. Operating profits for
    each geographical segment exclude general corporate expenses. Identifiable
    assets consist of those assets utilized within each respective geographic
    segment and exclude cash and short-term investments, which are classified
    as corporate assets.

<TABLE>
<CAPTION>
                                 Americas    Europe      Pacific   Eliminations    Total
    <S>                          <C>         <C>         <C>       <C>            <C>
    1993
    Sales:
       Unaffiliated
        customers                $168,800    $145,485    $128,840                 $443,125
       Unaffiliated export:
        Pacific customers             977                                              977
        European customers          1,264                                            1,264
        Total unaffiliated        171,041     145,485     128,840                  445,366
    Transfer between areas         85,438      24,513       6,162    (116,113)           -
        Total sales              $256,479    $169,998    $135,002   $(116,113)    $445,366
    Operating profits            $ 23,180    $ 36,902    $ 27,731                 $ 87,813
    General corporate expenses                                                     (16,621)
    Interest expense, net                                                           (7,969)
    Income from continuing
    operations before income taxes                                                $ 63,223
    Identifiable assets          $280,941    $138,326    $127,302   $(122,941)    $423,628
    Corporate assets                                                                40,642
    Net current assets of
      discontinued operations                                                      138,687
    Net long term assets of
      discontinued operations                                                       99,647
    Total assets                                                                  $702,604

    1992
    Sales:
       Unaffiliated
        customers                $159,458    $154,200    $108,923                 $422,581
       Unaffiliated export:
       Pacific customers              908                                              908
       European customers           3,699                                            3,699
        Total unaffiliated        164,065     154,200     108,923                  427,188
    Transfer between areas         80,944      23,391       7,360    (111,695)           -
        Total sales              $245,009    $177,591    $116,283   $(111,695)    $427,188
       Operating profits         $ 23,715    $ 40,962    $  7,186                 $ 71,863
    General corporate expenses                                                     (15,791)
    Interest expense, net                                                           (7,804)
</TABLE>

                                    Page 46
<PAGE>   13
<TABLE>
    <S>                             <C>      <C>       <C>       <C>         <C>

    Loss on sale of business         (2,415)                                   (2,415)
    Income from continuing         
    operations before income taxes                                           $ 45,853
    Identifiable assets            $268,819  $178,224  $102,035  $(125,560)  $423,518
    Corporate assets                                                           70,451
    Net current assets of             
      discontinued operations                                                 147,480
    Net long term assets of
      discontinued operations                                                 106,194
    Total assets                                                             $747,643

    1991
    Sales:
       Unaffiliated
        customers                  $162,182  $135,140  $110,115              $407,437
    Unaffiliated export:
        Pacific customers             1,943                                     1,943
        European customers            5,695                                     5,695
        Total unaffiliated          169,820   135,140   110,115               415,075
    Transfer between areas           76,293    18,901     5,787   (100,981)         -
        Total sales                $246,113  $154,041  $115,902  $(100,981)  $415,075
    Operating profits              $ 49,101  $ 16,619  $  9,820              $ 75,540
    General corporate expenses                                                (17,248)
    Interest expense, net                                                      (7,802)
    Income from continuing
    operations before income taxes                                           $ 50,490
    Identifiable assets            $253,071  $214,509  $ 97,975  $(136,293)  $429,262
    Corporate assets                                                           76,440
    Net current assets of
      discontinued operations                                                 140,364
    Net long term assets of
      discontinued operations                                                  99,593
    Total assets                                                             $745,659
</TABLE>

    Report of Independent Accountants

         To the Shareholders and Directors of Millipore Corporation:

    We have audited the accompanying consolidated balance sheets of Millipore
    Corporation as of December 31, 1993 and 1992, and the related consolidated
    statements of income, shareholders' equity, and cash flows for each of the
    three years in the period ended December 31, 1993.  These financial
    statements are the responsibility of the Company's management. Our
    responsibility is to express an opinion on these financial statements based
    on our audits.

    We conducted our audits in accordance with generally accepted auditing
    standards. Those standards require that we plan and perform the audit to
    obtain reasonable assurance about whether the financial statements are free
    of material misstatement. An audit includes examining, on a test basis,
    evidence supporting the amounts and disclosures in the financial statements.
    An audit also includes assessing the accounting principles used and
    significant estimates made by management, as well as evaluating the overall
    financial statement presentation. We believe that our audits provide a
    reasonable basis for our opinion.

    In our opinion, the financial statements referred to above present fairly,
    in all material respects, the consolidated financial position of Millipore
    Corporation at December 31, 1993 and 1992, and the consolidated results of
    its operations and its cash flows for each of the three years in the period
    ended December 31, 1993 in conformity with generally accepted accounting
    principles.

    As discussed in Notes A, H and L to the consolidated financial statements,
    the Company changed its method of accounting for postretirement benefits
    other than pensions and its accounting for income taxes in 1992.

    Boston, Massachusetts                   Coopers & Lybrand
    January 24, 1994, except as to the
    information presented in Note F, for which the date
    is March 3, 1994

                                    Page 47
<PAGE>   14
    Eleven-year Summary of Operations

    Millipore Corporation

<TABLE>
<CAPTION>
    
    (In thousands except per share)    1993     1992      1991      1990      1989       1988
    <S>                             <C>       <C>       <C>       <C>       <C>        <C>
    Net sales                       $445,366  $427,188  $415,075  $380,983  $365,825   $347,267
    Cost of sales                    193,575   195,462   194,557   170,049   165,979    161,613
    Gross profit                     251,791   231,726   220,518   210,934   199,846    185,654
    Selling, general and
     administrative expenses         145,647   142,701   129,593   117,214   115,951    116,636
    Research and development
      expenses                        34,952    32,953    32,633    29,538    28,756     22,336
    Restructuring charge                   -         -         -    17,103         -          -
    Operating income                  71,192    56,072    58,292    47,079    55,139     46,682
    Other income/loss, net                 -    (2,415)        -         -     3,149          -
    Interest income                    4,069     6,888     6,182     6,723     3,914      3,450
    Interest expense                 (12,038)  (14,692)  (13,984)  (10,418)   (8,543)    (6,543)
    Income from continuing
     operations before
     income taxes                     63,223    45,853    50,490    43,384    53,659     43,589
    Provision for income
     taxes excluding non-
     recurring tax benefit            14,225    10,317    14,570    13,629    11,619     10,955
    Nonrecurring benefit                   -         -         -         -         -          -
    Income from continuing
     operations                       48,998    35,536    35,920    29,755    42,040     32,634
    Earnings (loss) from
     discontinued operations         (10,851)    2,715    18,645    (6,678)   10,462     22,751
    Income before
     extraordinary item
     and cumulative effect
     of change in
     accounting principle             38,147    38,251    54,565    23,077    52,502     55,385
    Extraordinary item-loss
     on early extinguishment
     of debt                           3,544         -         -         -         -          -
    Cumulative effect of
     change in accounting for
     postretirement benefits               -     5,068         -         -         -          -
    Net income                       $34,603   $33,183   $54,565   $23,077   $52,502    $55,385

    Net income per common share:
     Income from continuing
     operations                        $1.75     $1.26     $1.27     $1.05     $1.48      $1.15
     Net income per common share        1.24      1.17      1.93      0.82      1.85       1.96
    
    Cash dividends declared per share   0.55      0.51      0.47      0.43      0.39       0.35 
    Average common shares
     and equivalents                  27,951    28,242    28,294    28,307    28,323     28,329

    Financial Data

    Working Capital                 $236,674  $223,453  $250,064  $227,219  $251,486   $251,825
    Total assets                     702,604   747,643   745,659   688,651   615,038    547,997
    Long-term obligations            102,047   103,240   106,306   107,517   106,147    105,946
    Shareholders' equity            $461,154  $452,835  $464,496  $427,008  $403,827   $362,800
</TABLE>

    The Company adopted SFAS #109 "Accounting for Income Taxes" during 1992 and
    restated tax provisions in 1991, 1990 and 1986.

    1984 earnings per share include a $.15 per share non-recurring tax benefit
    from the reversal of all deferred taxes provided on DISC income prior to
    1984.

                                    Page 48
<PAGE>   15

    Eleven-year Summary of Operations (continued)

<TABLE>
<CAPTION>
    (In thousands except per share)    1987       1986       1985      1984       1983
    <S>                              <C>        <C>        <C>       <C>        <C>
    Net sales                        $298,728   $251,212   $202,411  $193,190   $171,730
    Cost of sales                     138,587    117,997     99,427    97,048     85,631

    Gross profit                      160,141    133,215    102,984    96,142     86,099
    Selling, general and
     administrative expenses           98,730     87,058     66,409    62,777     57,579
    Research and development expenses  19,742     16,756     15,132    15,407     14,033
    Restructuring charge                    -          -          -         -          -

    Operating income                   41,669     29,401     21,443    17,958     14,487
    Other income/loss, net                  -          -          -         -          -
    Interest income                     2,234      3,066      3,403     4,145      3,129
    Interest expense                   (3,432)    (3,762)    (3,300)   (3,136)    (3,355)

    Income from continuing
     operations before income taxes    40,471     28,705     21,546    18,967     14,261
    Provision for income taxes
     excluding nonrecurring
     tax benefit                       10,040     10,538      5,357     5,121      3,824
    Nonrecurring benefit                    -         -           -    (4,002)         -

    Income from continuing
     operations                        30,431     18,167     16,189    17,848     10,437
    Earnings (loss) from
     discontinued operations           17,993     14,797     15,541    12,645     10,227
    Income before extraordinary
     item and cumulative effect
     of change in accounting
     principle                         48,424     32,964     31,730    30,493     20,664

    Extraordinary item-loss on
     early extinguishment of debt           -          -          -         -          -

    Cumulative effect of change 
    in accounting for                
    postretirement benefits                 -          -          -         -          -
    Net income                        $48,424    $32,964    $31,730   $30,493    $20,664

    Net income per common share:
     Income from continuing
     operations                         $1.07      $0.65      $0.59     $0.65      $0.38
    Net income per common share          1.71       1.18       1.15      1.11       0.76
    Cash dividends declared per share    0.31       0.27       0.24      0.22       0.20
    Average common shares and
     equivalents                       28,344     27,931     27,632    27,552     27,270

    Financial Data

    Working Capital                  $168,594   $165,421   $146,334  $121,075   $107,102
    Total assets                      452,387    369,414    326,903   283,517    259,700
    Long-term obligations               6,378     12,094     13,446    10,630     10,545
    Shareholders' equity             $327,604   $283,547   $244,607  $214,289   $192,886
</TABLE>

                                    Page 49
<PAGE>   16
    Quarterly Results (Unaudited)

    The Company's unaudited quarterly results are summarized below.
    
<TABLE>
<CAPTION>
                                            First    Second    Third    Fourth
    (In thousands, except per share data)  quarter  quarter   quarter  quarter    Year
    <S>                                   <C>       <C>       <C>      <C>      <C>
    1993
    Net sales                             $105,189  $114,613  $111,854 $113,710 $445,366
    Cost of sales                           45,140    49,271    49,587   49,577  193,575
         Gross profit                       60,049    65,342    62,267   64,133  251,791
    Selling, general and
     administrative expenses                36,555    36,946    36,424   35,722  145,647
    Research and development expenses        8,587     9,010     8,652    8,703   34,952
         Operating income                   14,907    19,386    17,191   19,708   71,192
    Interest (expense), net                 (2,217)   (2,083)   (1,968)  (1,701)  (7,969)
         Income from continuing
         operations before
         income taxes                       12,690    17,303    15,223   18,007   63,223
    Provision for income taxes               2,855     3,893     3,425    4,052   14,225
    Income from continuing operations        9,835    13,410    11,798   13,955   48,998 
    Loss from discontinued operations       (9,083)     (579)   (1,189)       -  (10,851)

    Extraordinary item - loss on early
      extinguishment of debt                     -         -         -    3,544    3,544
         Net income                       $    752  $ 12,831  $ 10,609 $ 10,411 $ 34,603
    Per share information
      Income from continuing  operations     $0.35     $0.48     $0.42    $0.50    $1.75
      Net income                             $0.03     $0.46     $0.38    $0.37    $1.24
    Weighted average common shares
     outstanding                            27,983    27,946    27,921   27,954   27,951

    1992
    Net sales                             $110,290  $108,300  $104,600 $103,998 $427,188
    Cost of sales                           49,268    52,829    45,534   47,831  195,462
         Gross profit                       61,022    55,471    59,066   56,167  231,726
    Selling, general and
     administrative expenses                34,837    35,868    35,608   36,388  142,701
    Research and development expenses        8,373     8,246     8,241    8,093   32,953
         Operating income                   17,812    11,357    15,217   11,686   56,072
    Loss on sale of business                     -    (2,415)        -        -   (2,415)
    Interest (expense), net                 (1,720)   (1,785)   (2,026)  (2,273)  (7,804)
         Income from continuing
         operations before
         income taxes                       16,092     7,157    13,191    9,413   45,853
    Provision for income taxes               3,620     1,610     2,969    2,118   10,317

    Income from continuing operations       12,472     5,547    10,222    7,295   35,536
    Earnings (loss) from discontinued
     operations                              1,149      (705)    2,735     (464)   2,715
    Income before cum. effect of
      change in accounting principle        13,621     4,842    12,957    6,831   38,251
    Cum. effect of change in
      accounting for postretirement
      benefits other than pensions           5,068         -         -        -    5,068
         Net income                        $ 8,553   $ 4,842  $ 12,957  $ 6,831  $33,183
    Per share information
      Income from continuing operations      $0.44     $0.20     $0.36    $0.26    $1.26
      Net income                             $0.30     $0.17     $0.46    $0.24    $1.17
    Weighted average common shares
     outstanding                            28,360    28,292    28,207   28,108   28,242
</TABLE>

                                    Page 50

<PAGE>   1
                                                                   EXHIBIT (h)


                                   Form 10-Q

                       SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

             (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended June 30, 1994
                                       OR

            (  ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                    for the transition period from ___________ to ___________

                    For Quarter Ended  Commission File Number

                    June 30, 1994           0-1052

                             Millipore Corporation          
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)
<TABLE>
<S>                                                                     <C>
   Massachusetts                                                                   04-2170233          
- --------------------                                                       ----------------------------
(State or other jurisdiction of incorporation or organization)          (I.R.S. Employer Identification No.)

80 Ashby Road                                                                        01730
Bedford, Massachusetts                                                             ---------
- ----------------------------                                                       (Zip Code)
(Address of principal executive offices)
</TABLE>

Registrant's telephone number, include area code    (617) 275-9200

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15 (d) of the Securities and 
Exchange Act of 1934 during the preceding 12 months (or for such shorter 
period that the registrant was required to file such reports), and 
(2) has been subject to such filing requirements for the past 90 days.

        Yes    X     No 
             -----      -----

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of June 30, 1994:  28,381,370

<PAGE>   2
                             MILLIPORE CORPORATION



                                     INDEX

<TABLE>
<CAPTION>
                                                           Page No.
                                                           --------
         <S>       <C>                                       <C>
         Part I.   Financial Information:

         Item 1.   Condensed Financial Statements

                   Consolidated Balance Sheets --
                      June 30, 1994 and December 31, 1993      2

                   Consolidated Statements of
                      Income -- Three Months and Six Months
                      Ended June 30, 1994 and 1993             3

                   Consolidated Statements of
                      Cash Flows -- Six Months Ended
                      June 30, 1994 and 1993                   4

                   Notes to Consolidated Condensed
                      Financial Statements                   5-6

         Item 2.   Management's Discussion and Analysis
                      of Financial Condition and Results
                      of Operations                            7

         Part II.  Other Information                           8

                   Signatures                                  9
</TABLE>


<PAGE>   3
                             MILLIPORE CORPORATION
                          CONSOLIDATED BALANCE SHEETS
                        (In thousands except share data)


<TABLE>
<CAPTION>
                                                June 30,      December 31,
                                                  1994            1993   
                                              ------------    -----------
     ASSETS                                    (Unaudited)
     ------                                    
<S>                                             <C>            <C>
Current assets
  Cash                                          $  2,036       $  2,140
  Short-term investments                          18,472         38,502
  Accounts receivable, net                       123,496         99,655
  Inventories
     Raw materials                                21,432         18,782
     Work in process                               9,306          7,852
     Finished goods                               45,205         38,553
                                                --------       --------
                                                  75,943         65,187
  Other current assets                             8,730         12,790
  Net current assets of discontinued
     operations                                  146,647        138,687
                                                --------       --------
Total current assets                             375,324        356,961
Property, plant and equipment, net of
  accumulated depreciation of $176,464
  in 1994 and $163,071 in 1993                   197,299        194,895
Intangible assets                                  2,549          2,769
Other assets                                      48,048         52,141
Net long-term assets of discontinued
  operations                                     100,428         99,647
                                                --------       --------
Total asset                                     $723,648       $706,413
                                                ========       ========

LIABILITIES AND SHAREHOLDERS' EQUITY
- ------------------------------------
Current liabilities
  Notes payable and current portion of
     long-term debt                             $ 26,098       $ 51,420
  Accounts payable and accrued expenses           52,785         57,505
  Dividends payable                                4,253          3,921
  Accrued retirement plan contributions            3,005          6,356
  Accrued and deferred income
     taxes payable                                10,324          4,894
                                                --------       --------
Total current liabilities                         96,465        124,096


Long-term debt                                   102,061        102,047
Other liabilities                                 18,257         19,116
Shareholders' equity
  Common stock                                    28,494         28,344
  Additional paid-in capital                      24,003         16,803
  Retained earnings                              455,307        434,988
  Translation adjustments                          5,003         (7,624)
                                                --------       --------
                                                 512,807        472,511
  Less: Treasury stock, at cost, 112,983
  shares in 1994 and 341,273 in 1993              (5,942)       (11,357)
                                                --------       -------- 
Total shareholders' equity                       506,865        461,154
                                                --------       --------
Total liabilities and
  shareholders' equity                          $723,648       $706,413
                                                ========       ========
</TABLE>

   The accompanying notes are an integral part of the consolidated condensed
                             financial statements.

                                      -2-

<PAGE>   4
                             MILLIPORE CORPORATION
                       CONSOLIDATED STATEMENTS OF INCOME
                      (In thousands except per share data)
                                  (Unaudited)

<TABLE>
<CAPTION>
                                                Three Months Ended        Six Months Ended
                                                      June 30,                  June 30,
                                                      --------                  --------
                                                  1994       1993            1994       1993
                                                  ----       ----            ----       ----
<S>                                             <C>        <C>             <C>        <C>
Net sales                                       $124,690   $114,613        $243,649   $219,802
Cost of sales                                     52,910     49,271         104,175     94,411
                                                --------   --------        --------   --------
  Gross profit                                    71,780     65,342         139,474    125,391

Selling, general &
 administrative expenses                          39,456     36,946          77,565     73,501
Research & development
 expenses                                          8,446      9,010          17,004     17,597
                                                --------   --------        --------   --------
  Operating income                                23,878     19,386          44,905     34,293

Interest expense, net                              1,204      2,083           2,497      4,300
                                                --------   --------        --------   --------
Income from continuing operations before
  income taxes                                    22,674     17,303          42,408     29,993

Provision for income taxes                         5,102      3,893           9,542      6,748
                                                --------   --------        --------   --------
Income from continuing
   operations                                     17,572     13,410          32,866     23,245
Loss from discontinued
   operations                                          -       (579)              -     (9,662)
                                                --------   --------        --------   -------- 
Net income                                      $ 17,572   $ 12,831        $ 32,866   $ 13,583
                                                ========   ========        ========   ========
Net income per common share
  From continuing operations                    $   0.62   $   0.48        $   1.16   $   0.83
  Net income                                    $   0.62   $   0.46        $   1.16   $   0.49
Cash dividends declared
 per common share                               $   0.15   $   0.14        $   0.29   $   0.27

Weighted average common
 shares                                           28,388     27,946          28,256     27,964
</TABLE>

   The accompanying notes are an integral part of the consolidated condensed
                             financial statements.

                                      -3-

<PAGE>   5
                             MILLIPORE CORPORATION
                           CONSOLIDATED STATEMENTS OF
                                   CASH FLOWS
                                 (In thousands)
                                  (Unaudited)


<TABLE>
<CAPTION>
                                                                   Six Months Ended
                                                                       June 30,
                                                                       --------
                                                                   1994      1993
Cash Flows From Operating Activities:                              ----      ----
- -------------------------------------                                            
<S>                                                             <C>         <C>
Net income                                                      $ 32,866    $ 13,583
Adjustments to reconcile net income to net
cash provided:
 Net loss from discontinued operations                                 -       9,662
 Depreciation and amortization                                    13,845      13,612
 Deferred income tax provision                                    (1,000)      2,000
 Change in operating assets and liabilities:
   (Increase) in accounts receivable                             (15,220)     (6,228)
   (Increase) decrease in inventories                             (6,193)      5,159
   (Increase) in other current assets                             (1,977)     (3,438)
   Decrease (increase) in other assets                              (573)     (2,623)
   (Decrease) in accounts payable and accrued
    expenses                                                      (2,115)     (5,282)
   (Decrease) in accrued retirement plan contributions            (3,484)     (2,045)
   Increase in accrued income taxes                                4,145       2,062
   Income tax refund received                                     14,035           -
   Other                                                          (1,887)     (1,474)
                                                                --------    -------- 
 Net cash provided by continuing operations                       32,442      24,988
 Net cash provided by discontinued operations                      2,798       9,153
                                                                --------    --------
Net cash provided by operating activities                         35,240      34,141

Cash Flows From Investing Activities:
- -------------------------------------
Additions to property, plant, and equipment                       (9,911)    (13,609)
Net investing activities of discontinued operations               (4,703)     (3,712)
                                                                --------    -------- 
Net cash used in investing activities                            (14,614)    (17,321)

Cash Flows From Financing Activities:
- -------------------------------------
Treasury stock acquired                                          (15,804)     (3,034)
Issuance of treasury stock under stock plans                      16,905         630
Cash paid to extinguish long-term debt                            (5,088)          -
Common stock issued                                                7,350           -
Cash paid to close out foreign currency swap                     (10,287)          -
Net change in short-term debt                                    (28,375)    (15,428)
Net change in long-term debt                                         (92)        (68)
Dividends Paid                                                    (7,844)     (7,281)
                                                                --------    -------- 
Net cash used for financing activities                           (43,235)    (25,181)

Effect of foreign exchange rates on cash and
 short-term investments                                            2,475      (1,455)
                                                                --------    -------- 
Net decrease in cash and short-term investments                  (20,134)     (9,816)
Cash and short-term investments on January 1                      40,642      70,451
                                                                --------    --------
Cash and short-term investments on June 30                      $ 20,508    $ 60,635
                                                                ========    ========
Interest Paid                                                   $  4,343    $  4,588
                                                                ========    ========
Taxes Paid                                                      $  8,199    $  5,005
                                                                ========    ========
</TABLE>

   The accompanying notes are an integral part of the consolidated condensed
                             financial statements.


                                      -4-

<PAGE>   6

                             MILLIPORE CORPORATION
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (in thousands)

1.  The accompanying unaudited consolidated condensed financial statements have
    been prepared in accordance with the instructions to Form 10-Q and,
    accordingly, these footnotes condense or omit certain information and
    disclosures normally included in financial statements. These financial
    statements, which in the opinion of management reflect all adjustments
    necessary for a fair presentation, should be read in conjunction with the
    financial statements and notes thereto included in the Company's Annual
    Report on Form 10-K for the year ended December 31, 1993. The accompanying
    unaudited consolidated condensed financial statements are not necessarily
    indicative of future trends or the Company's operations for the entire year.

2.  As discussed in Note B to the December 31, 1993 Annual Report, on November
    11, 1993, the Company's Board of Director's approved a plan to divest
    operations of the Company's Instrumentation Divisions, which serve
    primarily the chromatography and bioscience markets. The operating results
    of these businesses through November 11, 1993 have been classified as
    discontinued operations in the Company's financial statements. The
    operating results of these businesses from November 11, 1993 to the date of
    the divestiture will be deferred until the divestiture is completed. The
    Company expects to realize a net gain in 1994 upon the sale of these
    businesses. Net current and long-term assets of discontinued operations
    consist primarily of accounts receivable, inventory, property, plant and
    equipment, intangibles, and accounts payable, and have been classified
    separately in the accompanying consolidated balance sheets.


    On April 4, 1994, the Company entered into a purchase and sale agreement
    for the sale of the net assets of its Waters Chromatography Division to
    Waters Holdings Inc., a corporation owned equally by AEA Investors, Inc.
    and Bain Capital, Inc.

    On July 14, 1994, the Company announced that it had finalized an asset
    purchase and sale agreement for the sale of the business and certain net
    assets of its Biosearch division to PerSeptive Biosystems, Inc.

    The Company expects to complete the sale of both divisions by the end
    of August, 1994.

3.  As discussed in Note I to the December 31, 1993 Annual Report, Eastern
    Enterprises and its subsidiary, Ionpure Technologies Corporation filed a
    suit against the Company alleging misrepresentations made in conjunction
    with its 1989 purchase of the Company's Process Water Division. The
    Company believes that it has adequate and complete defenses to this
    lawsuit. Although the Company is unable to predict with certainty the
    outcome of this litigation, its ultimate disposition is not expected to
    have a material adverse effect on the Company's financial condition.

4.  Certain reclassifications have been made to the 1993 financial
    statements to conform to the 1994 presentation.

                                      -5-

<PAGE>   7
                             MILLIPORE CORPORATION
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (in thousands)




5.  As discussed in Note F to the December 31, 1993 Annual Report, the Company
    entered into an agreement in the fourth quarter of 1993 to retire its
    $100,000 notes payable bearing interest at 9.2 percent before their  call
    date of March 30, 1995. Accordingly, the Company recorded an extraordinary
    charge of $5,906 ($3,544 net of income taxes) in  December, 1993 to reflect
    the cost of extinguishing the notes. In March, 1994, the Company retired 
    the notes and simultaneously issued $100,000 of 6.78% notes due in 2004.
    Interest on the new notes is payable semi-annually beginning in September,
    1994.

    At the same time as the issuance of the $100,000 9.2 percent bearing  notes
    described above, the Company partially hedged its Japanese yen net asset
    exposure by entering into a currency swap by exchanging $80,000 of dollar
    debt service obligations for 9,936,000 of yen obligations. The yen
    obligations bore a 5.27 percent interest rate and matured in 1995. The
    effects of foreign currency exchange rate fluctuations resulting from this
    swap were reflected each reporting period in translation adjustment and
    transaction gains/losses. The unrealized loss on this swap of $8,833
    at December 31, 1993 was included in other assets in the Company's balance
    sheet.

    In January, 1994, the Company closed out its yen denominated currency swap
    and simultaneously exchanged $80,000 of dollar debt service obligations for
    a yen denominated obligation of 8,760,000 yen, which bears interest at a
    rate of 4.49 percent. The swap matures in 2004. The Company paid $10,287 
    in cash to close out the old swap. The cash payment represented the
    cumulative effect of the foreign currency rate fluctuations over the life
    of the swap.


                                      -6-
<PAGE>   8

                     MANAGMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Sales for the second quarter of 1994 increased 9 percent compared to sales for
the second quarter of 1993. For the first six months of 1994, sales increased
11 percent over the same period in 1993. For the quarter, sales were
particularly strong, up 15 percent, for products and systems used in
manufacturing applications, led by sales to microelectronics customers. Sales
to the laboratory/research market, however continued to grow modestly in the
second quarter of 1994. By geography, sales growth continued to be strong in
the Asis/Pacific region, with particularly strong growth in Korea, in the
second quarter. Sales growth in both the Americas and Europe was more modest in
the second quarter of 1994 than in the first quarter. Although foreign currency
fluctuations had no impact on the Company's reported sales growth, they were a
factor in the reported sales growth within specific geographies, positively
impacting the Asia/Pacific region while negatively impacting Europe. Sales
growth by geography is summarized as follows:

<TABLE>
<CAPTION>
                      Sales growth rates                   Sales growth rates
                  measured in local currencies          measured in U.S. dollars
             3 months ended     Six Months ended   3 months ended      Six months ended
                 6/30/94            6/30/94            6/30/94              6/30/94             
                 -------            -------            -------              -------             
<S>               <C>               <C>                <C>                  <C>
Americas            5%                9%                 5%                   9%
Europe              5%                7%                 2%                   3%
Asia/Pacific       17%               17%                20%                  23%
                   ---               ---                ---                  ---
                    9%               11%                 9%                  11%
                   ===               ===                ===                  ===
</TABLE>


Gross margins increased slightly during the second quarter of 1994 to 57.6
percent as compared to 57.0 percent in the second quarter of 1993. Gross
margins for the first six months of 1994 improved slightly over the first six
months of 1993. The increase in operating expenses in the second quarter of
1994, as well as in the first six months, as compared to 1993 has been limited
as management continued to analyze the significant business divesture activities
taking place and the resulting required level of infrastructure spending to
support the ongoing businesses. Net interest expense decreased 42 percent in
the second quarter and first six months of 1994 compared to 1993, primarily due
to a lower interest rate on the Company's refinanced long-term $100 million
notes payable as well as an overall lower level of short-term borrowings. The
Company's effective income tax rate for 1994 is 22.5 percent, consistent with
the full year effective rate in 1993.

The company generated $32.4 million of cash from continuing operations in the
first six months of 1994 compared to $25.0 million during the same period in
1993. In addition to the increase in net income of $19.3 million year over
year, the Company received a tax refund of $14.0 during the second quarter of
1994. This was offset by an increase in accounts receivable of $15.2 million in
the first six months of 1994 compared to an increase of $6.2 million in 1993.
Inventories increased $6.2 million in 1994 compared to a decrease in 
inventories of $5.2 million in 1993. Property, plant and equipment 
expenditures in the first six months of 1994 were lower than those for the 
comparable period in 1993. During the first six months of 1994, the Company 
paid a total of $15.4 million in non-recurring financing related transactions; 
$5.1 million was used to pre-pay the Company's $100 million notes payable due 
in 1998, while $10.3 million was used to close out the Company's $100 million 
notes payable due in 1998, while $10.3 million was used to close out the 
Company's yen currency swap. These non-recurring payments were partially 
offset by $16.9 million of cash generated from stock options exercised by 
employees.



                                      -7-
<PAGE>   9

                          PART II - OTHER INFORMATION

<TABLE>
<S>         <C>
Item 6.     Exhibits and Reports on Form 8-K.
            ---------------------------------

            b. Reports on Form 8-K - There were no reports on Form 8-K filed
               for the quarter ended June 30, 1994.
</TABLE>




                                      -8-

<PAGE>   10
                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its  behalf by the
undersigned, thereunto duly authorized.



                              Millipore Corporation
                              ------------------------------------------
                              Registrant



August 15, 1994               /s/ Michael P. Carroll
Date                          ------------------------------------------
                              Michael P. Carroll
                              Vice President, Chief Financial Officer and
                              Treasurer



                                      -9-

<PAGE>   1
                                                                   EXHIBIT (i)


                       SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

                                    FORM 8-K


                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


       Date of Report (Date of earliest event reported): August 18, 1994


                             MILLIPORE CORPORATION
                             ---------------------
             (Exact name of registrant as specified in its charter)




         Massachusetts                  0-1052            04-2170233
         -------------                  ------            ----------
   State or other jurisdiction       (Commission        (IRS Employer
        of incorporation)            File Number)    Identification No.)


            80 Ashby Road, Bedford, Massachusetts            01730  
            -------------------------------------            -----
          (Address of principal executive offices)         (Zip Code)


     Registrant's telephone number, including area code:  (617) 275-9200  
                                                          --------------



                               Page 1 of 15 pages
                      Exhibit Index is located on Page 10

<PAGE>   2

Item 2.  Acquisition or Disposition of Assets

     On November 11, 1993, Millipore Corporation (the Company) announced its
intent to divest its Waters Chromatography (Waters) product lines and exit
its non-membrane bioscience business Biosearch), and to focus the Company on
its membrane business.  The Company filed an 8-K dated November 30, 1993
restating the Company's unaudited results for 1993, 1992 and 1991 and its
unaudited balance sheets as of September 30, 1993 and December 31, 1992 to
reflect Waters and Biosearch as discontinued operations.  The results of
operations of these discontinued businesses since November 11, 1993 have been
deferred pending finalization of the divestitures.

     On April 22, 1994, the Company announced that its Board of Directors had
approved the use of the anticipated net proceeds from the sale of Waters for
the repurchase of Company stock.  A copy of that press release is attached as
Exhibit 99(a) hereto and is incorporated by reference.

     On August 18, 1994, the Company finalized the sale of the net assets of
Waters to Waters Holdings, Inc., a corporation owned equally by AEA Investors
Inc. and Bain Capital, Inc.  The sale was effected pursuant to an amended and
restated purchase and sale agreement dated as of March 31, 1994 (executed
June 28, 1994) and as amended on August 11, 1994.  On August 18, 1994, the
Company issued a press release announcing the consummation of the sale.  A
copy of that press release is attached as Exhibit 99(b) hereto and is
incorporated by reference.  The sale price, which was established through
arms' length negotiations following the solicitation, receipt and
consideration of proposals from various interested parties, was $340,000,000.

     On August 23, 1994, the Company announced that it had completed the sale
of Biosearch to PerSeptive Biosystems, Inc.  For this transaction, the
Company received approximately $1,000,000 in cash and 4,000 shares of non-
voting preferred stock redeemable in four equal annual installments of
$10,000,000.  A copy of that press release is attached as Exhibit 99(c).

     The net proceeds from these two transactions was approximately
$300,000,000.

     On August 24, 1994, the Company announced that it would repurchase up to
3,500,000 shares through a procedure referred to as a Dutch auction.  On
August 25, 1994, the Company will extend to shareholders an offer to purchase
shares at a price not less than $52.00 and not greater than $60.00.  This
offer will expire at 12:00 midnight on September 22, 1994.  A copy of that
press release is attached as Exhibit 99(d) hereto and is incorporated by
reference.

     Financial information delivered pursuant to Item 7(b) of Form 8-K is
also incorporated by reference herein.





                                     Page 2
<PAGE>   3
Item 7.  Financial Statements and Exhibits

(b)  Pro forma financial information

(1)      Unaudited Pro Forma Condensed Consolidated Statement of Income of
         Millipore Corporation for the six months ended June 30, 1994 and the
         year ended December 31, 1993

         Unaudited Pro Forma Condensed Consolidated Balance Sheet of Millipore
         Corporation as of June 30, 1994

         Notes to Unaudited Pro Forma Condensed Consolidated Financial 
         Statements

(c)  Exhibits

         Exhibit 99 (a) Press Release dated April 22, 1994

         Exhibit 99 (b) Press Release dated August 18, 1994

         Exhibit 99 (c) Press Release dated August 23, 1994

         Exhibit 99 (d) Press Release dated August 24, 1994





                                     Page 3

<PAGE>   4


                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.




                              MILLIPORE CORPORATION



Date   August 24, 1994        /S/MICHAEL P. CARROLL
                              Michael P. Carroll
                              Vice President, Chief Financial
                              Officer and Treasurer





                                     Page 4
<PAGE>   5
                   UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
                              FINANCIAL STATEMENTS




On August 18, 1994, the Company completed the sale of Waters.  On August 22,
1994, the Company completed the sale of Biosearch.  The Company has realized
approximately $300,000,000 in net proceeds from these transactions.
Subsequent to these transactions, the Company has invited shareholders to
participate in a "dutch auction" tender offer.  Under the terms of the tender
offer, the Company intends to repurchase up to 3,500,000 shares of common
stock at a purchase price not less than $52.00 and not more than $60.00 per
share.

The following unaudited condensed consolidated pro forma financial statements
gives effect to the disposition of the discontinued businesses and the
purchase of shares pursuant to the Offer, based on certain assumptions
described in the Notes to the Condensed Consolidated Pro Forma Financial
Statements.  The Consolidated Statements of Income give effect to the
transactions as if they had occurred on January 1, 1994 and January 1, 1993.
These financial statements should be read in conjunction with the historical
financial statements and are presented for illustrative purposes only and are
not necessarily indicative of the financial position or results of operations
which would actually have been reported had the transactions been completed
at the dates indicated or that may be obtained in the future.





                                     Page 5

<PAGE>   6
                             MILLIPORE CORPORATION
         UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                          YEAR ENDED DECEMBER 31, 1993
                      (In thousands except per share data)

<TABLE>
<CAPTION>
                                        Historical   Pro Forma    Pro Forma
                                        Statements  Adjustments     Results
                                        ----------  -----------   ---------
<S>                                     <C>         <C>           <C>
Net sales                               $445,366                  $445,366
Cost of sales                            193,575                   193,575
                                        --------                  --------
  Gross profit                           251,791                   251,791

Selling, general and
  administrative expenses                145,647                   145,647
Research and development
  expenses                                34,952                    34,952
                                        --------                  --------
  Operating income                        71,192                    71,192

Interest expense, net                      7,969                     7,969
                                        --------                  --------
Income from continuing operations
  before income taxes                     63,223                    63,223

Provision for income taxes                14,225                    14,225

Income from continuing
  operations                              48,998                    48,998

Loss from discontinued operations        (10,851)     10,851             -
                                        --------    --------      --------
Income before extraordinary item          38,147      10,851        48,998

Extraordinary item-loss on early
  extinguishment of debt                   3,544                     3,544
                                        --------    --------      --------
Net income                              $ 34,603    $ 10,851      $ 45,454
                                        --------    --------      --------
                                        --------    --------      --------
Income per common share:
  Income from continuing operations     $   1.75                  $   2.00
  Net income                            $   1.24                  $   1.86

Weighted average common shares
  outstanding                             27,951      (3,500)       24,451
</TABLE>

The accompanying notes are an integral part of these pro forma condensed
consolidated financial statements.

                                     Page 6
<PAGE>   7
                             MILLIPORE CORPORATION
         UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
                         SIX MONTHS ENDED JUNE 30, 1994
                      (In thousands except per share data)

<TABLE>
<CAPTION>
                                        Historical    Pro Forma   Pro Forma
                                        Statements   Adjustments   Results 
                                        ----------   -----------  ---------
<S>                                     <C>            <C>        <C>
Net sales                               $243,649                  $243,649
Cost of sales                            104,175                   104,175
                                        --------                  --------
  Gross profit                           139,474                   139,474

Selling, general and
  administrative expenses                 77,565                    77,565
Research and development
  expenses                                17,004                    17,004
                                        --------                  --------
  Operating income                        44,905                    44,905

Interest expense, net                      2,497                     2,497
                                        --------                  --------
Income from continuing operations
  before income taxes                     42,408                    42,408

Provision for income taxes                 9,542                     9,542
                                        --------                  --------

Income from continuing
  operations                              32,866                    32,866

Earnings (loss) from discontinued
  operations                                   -                         -
                                        --------                  --------
  Net income                            $ 32,866                  $ 32,866
                                        --------                  --------
                                        --------                  --------
Income per common share:
  Income from continuing operations     $   1.16                  $   1.33
  Net income                            $   1.16                  $   1.33

Weighted average common shares
  outstanding                             28,256       (3,500)      24,756
</TABLE>

The accompanying notes are an integral part of these pro forma condensed
consolidated financial statements.

                                     Page 7
<PAGE>   8
                             MILLIPORE CORPORATION
           UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEETS
                              AS OF JUNE 30, 1994
                                 (In thousands)


<TABLE>
<CAPTION>
                                                      Historical   Pro Forma   Pro Forma
                                                      Statements  Adjustments   Results
                                                      ----------  -----------  ---------
Assets 
- -------
<S>                                                     <C>       <C>           <C>
Cash and short-term investments                         $ 20,508  $  89,500     $110,008
Accounts receivable, net                                 123,496                 123,496
Accounts receivable-other                                      -     24,600       24,600
Inventories                                               75,943                  75,943
Other current assets                                       8,730                   8,730
Net current assets of discontinued operations            146,647   (146,647)           -
                                                        --------  ---------     --------
  Total current assets                                   375,324    (32,547)     342,777

Property, plant and equipment, net                       197,299                 197,299
Intangible and other assets                               50,597     18,000       68,597
Net long-term assets of discontinued operations          100,428   (100,428)           -
                                                        --------  ---------     --------
  Total assets                                          $723,648  $(114,975)    $608,673
                                                        --------  ---------     --------
                                                        --------  ---------     --------
Liabilities and Shareholders' Equity
- ------------------------------------
Notes payable and current portion of long-term debt     $ 26,098                 $26,098
Accounts payable and accrued expenses                     52,785     85,525      138,310
Dividends payable                                          4,253                   4,253
Accrued retirement plan contributions                      3,005                   3,005
Accrued and deferred income taxes payable                 10,324                  10,324
                                                        --------  ---------     --------
  Total current liabilities                               96,465     85,525      181,990

Long-term debt                                           102,061                 102,061
Other liabilities                                         18,257                  18,257

Shareholders' equity                                     506,865   (200,500)     306,365
                                                        --------  ---------     --------
  Total liabilities and shareholders' equity            $723,648  $(114,975)    $608,673
                                                        --------  ---------     --------
                                                        --------  ---------     --------
</TABLE>

The accompanying notes are an integral part of these pro forma condensed
consolidated financial statements.



                                     Page 8
<PAGE>   9
                             MILLIPORE CORPORATION
                     NOTES TO UNAUDITED PRO FORMA CONDENSED
                       CONSOLIDATED FINANCIAL STATEMENTS



1.   The Company has sold Waters for $330,000,000 in cash and $10,000,000 in
     preferred stock.  The Company has sold Biosearch for $1,000,000 in cash
     and 4,000 shares of non-voting preferred stock redeemable in four equal
     annual installments of $10,000,000.  The sale of Waters and Biosearch
     resulted in net cash proceeds of approximately $300,000,000.  The pro
     forma financial statements assume the following:

     -    The divestitures are assumed to have generated a $10,000,000 after
          tax gain.  The gain is reflected as an adjustment to shareholders'
          equity as of the beginning of 1993 and 1994.

     -    Accounts receivable balances from Waters and Biosearch customers
          which have been retained by the Company are classified as accounts
          receivable-other.

     -    The preferred stock referred to above has been recorded at its
          estimated market value of $18,000,000 and has been classified in
          other assets.

     -    The Company purchased 3,500,000 shares of its common stock at the
          maximum price under the tender offer of $60.00 per share
          ($210,000,000).

     -    Expenses directly related to the share repurchase offer are assumed
          to be $500,000 and are charged against additional paid in capital.

     -    None of the 1,300,000 shares exercisable by employees of the
          Company under the Company's employee stock option plan are assumed
          to be exercised in the stock tender offer.

     Adjustments have been recorded in the unaudited pro forma condensed
     consolidated financial statements to reflect the receipt of the net
     proceeds, the disposition of the net assets of the businesses and the
     recording of accruals to cover the costs associated with the
     transactions.  The pro forma results assume no reinvestment of the
     excess proceeds over the purchase price of the shares.  There can be no
     assurance that the Company will purchase 3,500,000 shares or the price
     at which the shares will be repurchased.

2.   Net income has been adjusted by the Company's results of its
     Chromatography and Bioscience divisions which were previously reported
     as discontinued operations.

3.   The unaudited pro forma income from continuing operations per share is
     based upon the average number of common shares outstanding for the six
     months ended June 30, 1994 and the year ended December 31, 1993 reduced
     by the common stock repurchased.


                                     Page 9
<PAGE>   10
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
                                                          Sequential
Exhibit                                                   Page Number
- -------                                                   -----------
<S>                 <C>                                       <C>
99(a)               Press Release dated April 22, 1994        11

99(b)               Press Release dated August 18, 1994       12-13

99(c)               Press Release dated August  23, 1994      14

99(d)               Press Release dated August 24, 1994       15
</TABLE>





                                    Page 10
<PAGE>   11
                                                                   Exhibit 99(a)



For Immediate Release


Contact:  John Glass, Director of Investor Relations, (617) 275-9211,
          ext. 2353
      Geoffrey Helliwell, Director of Treasury Operations,
      (617) 275-9200,
          ext. 2032


                      Share Buy-Back Planned by Millipore


Bedford, Massachusetts, April 22, 1994 -- Millipore Corporation (NYSE/MIL)
announced today that at a meeting following yesterday's Annual Meeting of
Shareholders, its Board of Directors approved the use of approximately $300
million of the anticipated net proceeds from the sale of its Waters
Chromatography division for the repurchase of the Company's stock.  The exact
method of repurchase has not been decided at this time.  The Company does not
expect to begin share repurchase before the completion of the Waters
transaction which is expected at the end of the second quarter.

In a related matter, Millipore also announced that it will immediately
reinstate its long-standing practice of purchasing shares in the open market
to meet some or all of its anticipated short-term demand for stock under its
employee stock plan.  The size of such demands for calendar 1994 is
anticipated to be somewhat in excess of 1 million shares.

Millipore is a multinational company focused on applying purification
technology to critical research and manufacturing problems in global growth
markets, including the pharmaceutical/biotechnology, electronics/industrial,
university/government, and medical/health care markets.

                                    Page 11
<PAGE>   12

                                                                   Exhibit 99(b)
For Immediate Release

Contact:  John Glass, Director of Investor Relations
         (617) 275-9200, ext. 2353

         Geoffrey Helliwell, Director of Treasury Operations
         (617) 275-9200, ext. 2032

           Millipore Finalizes Sale of Waters Chromatography Division

Bedford, Massachusetts, August 18, 1994 - Millipore Corporation (NYSE/MIL)
announced today that it has finalized the sale of its Waters Chromatography
Division to Waters Holdings, Inc., a new corporation owned equally by AEA
Investors, Inc. and Bain Capital, Inc.  The sale price was $340 million.  As
previously announced, the Company anticipates that the net proceeds of this
transaction, approximately $300 million, will be applied primarily to the
repurchase of Millipore stock.

John Gilmartin, Millipore's Chairman and CEO, commented:  "We have realized
excellent value for Waters, reflecting its status as a technology and market
leader in high performance liquid chromatography.  We intend to quickly
translate that into shareholder value through an aggressive share repurchase
program.

"The sale of Waters is the major milestone in our efforts to refocus
Millipore on its core purification business.  The refocusing effort has
already paid off in improved sales and earnings growth in the past six
months."

Douglas Berthiaume, CEO and President of Waters, noted: "This announcement
signifies the end of a mutually rewarding process for both Millipore and
Waters.  As an independent corporation, Waters will have the resources and
commitment to focus entirely on the field of liquid chromatography, providing
our customers with a total system solution worldwide."

Included in the Waters transaction were the facilities and equipment at
Waters manufacturing plants in Milford, Massachusetts and Taunton,
Massachusetts, as well as facilities and equipment in Waters sales and
service offices worldwide.
                                    Page 12

<PAGE>   13

Millipore is a multinational company focused on applying purification
technology to critical research and manufacturing problems in global growth
markets, including the pharmaceutical/biotechnology, electronics/industrial,
university/government and medical/health care markets.





                                    Page 13
<PAGE>   14

                                                                   Exhibit 99(c)
For Immediate Release


Contact:  John Glass, Director of Investor Relations
         (617) 275-9200, ext. 2353

         Geoffrey Helliwell, Director of Treasury Operations
         (617) 275-9200, ext. 2032

                 Millipore Completes Sale of Biosearch Division
                         to PerSeptive Biosystems, Inc.

Bedford, Massachusetts, August 23, 1994 - Millipore Corporation (NYSE/MIL)
announced that it has completed the sale of its Biosearch Division to
PerSeptive Biosystems, Inc. (Nasdaq/NMSPBIO).  For this transaction Millipore
received approximately $1 million in cash and 4,000 shares of non-voting
preferred stock redeemable in four equal annual installments of $10 million.

John Gilmartin, Millipore's Chairman and CEO, commented:  "We're pleased to
have completed this transaction with PerSeptive Biosystems.  It is a key
milestone in our refocusing efforts.  PerSeptive Biosystems also offers an
excellent strategic and organizational fit for our Biosearch Division."

Millipore will continue to support and focus on the life science research
community with its membrane-based systems and devices. Biosearch products
include instrumentation and chemistries for nucleic acid synthesis, peptide
synthesis and fluorescence-based assays.

PerSeptive Biosystems, Inc. designs, manufactures and markets proprietary
products and systems for the purification and analysis of biomolecules.

Millipore is a multinational company focused on applying purification
technology to critical research and manufacturing problems in global growth
markets, including the pharmaceutical/biotechnology, electronics/industrial,
university/government and medical/health care markets.



                                    Page 14

<PAGE>   15
                                                                EXHIBIT 99(d)

For Immediate Release

Contact:  John Glass, Director of Investor Relations
          (617) 275-9200, ext. 2353

          Geoffrey Helliwell, Director of Treasury Operations
          (617) 275-9200, ext. 2032

               Millipore $300 Million Stock Repurchase to Include
                          "Dutch Auction" Self-Tender

Bedford, Massachusetts, August 24, 1994 -- Millipore announced today it was
using a portion of the $300 million in net proceeds from the sale of its
Waters Chromatography and Biosearch Divisions to repurchase up to 3,500,000
shares of its common stock through a Dutch Auction Self-Tender.  Subsequent
to the completion of the self-tender offer, the balance of the proceeds is
expected to be used to fund an open-market repurchase program.  The self-
tender offer will commence on August 25, 1994 and expire at midnight on
September 22, 1994, unless extended.

Under the terms of the offer, the Company will invite shareholders to tender
their shares at prices between $52 and $60, as the shareholder shall specify.
Millipore will determine the single, per share price within that price range
(the "Purchase Price") that will allow it to purchase 3,500,000 shares or
such lesser number as may be tendered.  All shares validly tendered at or
below the Purchase Price will be purchased at the Purchase Price.  If more
than 3,500,000 shares are tendered at or below the Purchase Price, there will
be a proration. The offer is not conditioned on any minimum number of shares
being tendered.  The offer is, however, subject to certain other conditions
set forth in the offer.

J.P. Morgan Securities Inc. is acting as Dealer Manager for the offer and
D.F. King & Co., Inc. is acting as the Information Agent.

Millipore is a multinational company focused on applying purification
technology to critical research and manufacturing problems in global growth
markets, including the pharmaceutical/biotechnology, electronics/industrial,
university/government, and medical/health care markets.






© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission