MOLECULAR DEVICES CORP
SC 13G/A, 1999-02-11
LABORATORY ANALYTICAL INSTRUMENTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*


                          Molecular Devices Corporation
                  ----------------------------------------------
                                (Name of Issuer)


                                  Common Stock
                  ----------------------------------------------
                         (Title of Class of Securities)


                                    60851C107
                  ----------------------------------------------
                                 (CUSIP Number)


               ---------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  / /      Rule 13d-1(b)

                  / /      Rule 13d-1(c)

                  /X/      Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.


                               Page 1 of 4 pages
<PAGE>

- ---------------------------                          --------------------------
CUSIP NO. _60851C107__               13G             PAGE 2 OF 4 PAGES
- ---------------------------                          --------------------------


- -------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON
    I.R.S. IDENTIFICATION NO(S). OF ABOVE PERSON(S) (ENTITIES ONLY)

    A. BLAINE BOWMAN
- -------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
    (a)
    (b)   /X/
- -------------------------------------------------------------------------------
3   SEC USE ONLY

- -------------------------------------------------------------------------------
4   CITIZENSHIP OR PLACE OF ORGANIZATION

    UNITED STATES
- -------------------------------------------------------------------------------

     NUMBER OF       5     SOLE VOTING POWER

       SHARES              67,500
                     ----------------------------------------------------------
    BENEFICIALLY     6     SHARED VOTING POWER

      OWNED BY             382,166 (see disclaimer of beneficial ownership in
                           response to Item #4)
        EACH         ----------------------------------------------------------
                     7     SOLE DISPOSITIVE POWER
     REPORTING
                           67,500
       PERSON        ----------------------------------------------------------
                     8     SHARED DISPOSITIVE POWER
       WITH:
                           382,166 (see disclaimer of beneficial ownership in
                           response to Item #4)
- -------------------------------------------------------------------------------
9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       449,666
- -------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- -------------------------------------------------------------------------------
11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       4.7%
- -------------------------------------------------------------------------------
12     TYPE OF REPORTING PERSON*

                                                       IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

                              Page 2 of 4 pages
<PAGE>

ITEM 1.
          (a)      Name of Issuer
                   MOLECULAR DEVICES CORPORATION

          (b)      Address of Issuer's Principal Executive Offices
                   1311 ORLEANS DRIVE, SUNNYVALE, CALIFORNIA
ITEM 2.
          (a)      Name of Person Filing
                   A. BLAINE BOWMAN

          (b)      Address of Principal Business Office or, if none, Residence
                   1228 TITAN WAY
                   SUNNYVALE, CA  94086

          (c)      Citizenship
                   UNITED STATES

          (d)      Title of Class of Securities
                   COMMON STOCK
                   CUSIP Number
                   60851C107

ITEM 3.   IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 240.13d-1(b), OR
          240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

          (a)  / /  Broker or Dealer registered under Section 15 of the Act 
                    (15 U.S.C. 78o);

          (b)  / /  Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 
                    78c);

          (c)  / /  Insurance company as defined in section 3(a)19) of the Act 
                    (15 U.S.C. 78c);

          (d)  / /  An investment company registered under section 8 of the 
                    Investment Company Act of 1940 (15 U.S.C. 80a-8);

          (e)  / /  An investment adviser in accordance with 
                    Section 240.13d-1(b)(1)(ii)(E);

          (f)  / /  An employee benefit plan or endowment fund in accordance 
                    with Section 240.13d-1(b)(1)(ii)(F);

          (g)  / /  A parent holding company or control person in accordance 
                    with Section 240.13d-1(b)(ii)(G);

          (h)  / /  A savings association as defined in Section 3(b) of the 
                    Federal Deposit Insurance Act (12 U.S.C. 1813);

          (i)  / /  A church plan that is excluded from the  definition of an 
                    investment company under section  3(c)(14) of the 
                    Investment Company Act of 1940 (15 U.S.C. 80a-3);

          (j)  / /  Group, in accordance with Section 240.13d-1(b)(1)(ii)(J)

ITEM 4.   OWNERSHIP
          Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

          (k)  Amount Beneficially Owned:
               449,666
          (l)  Percent of Class:
               4.7%
          (m)  Number of shares as to which such person has:
<TABLE>
               <S>                                                            <C>
               (i)   Sole power to vote or to direct the vote:                67,500
               (ii)  Shared power to vote or to direct the vote:              382,166
               (iii) Sole power to dispose or to direct the disposition of:   67,500
               (iv)  Shared power to dispose or to direct the disposition of: 382,166
</TABLE>

* Includes 382,166 shares beneficially owned by Dionex, of which Mr. Bowman, is
President, Chief Executive Officer, and a director. Mr. Bowman disclaims
beneficial ownership of the Dionex shares. Includes 16,500 shares that may be
acquired within 60 days after December 31, 1998.

                                Page 3 of 4 pages
<PAGE>

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following /X/.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

         NOT APPLICABLE

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

         NOT APPLICABLE

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         NOT APPLICABLE

ITEM 9.  NOTICE OF DISSOLUTION OF A GROUP

         NOT APPLICABLE

ITEM 10. CERTIFICATION

                      NOT APPLICABLE


                                    SIGNATURE

         After reasonable 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.

                                                2/11/99
                                   ---------------------------------
                                                 Date

                                       /s/ A. Blaine Bowman
                                   ---------------------------------
                                               Signature

                                           A. BLAINE BOWMAN
                                   ---------------------------------
                                               Name/Title




                                  Page 4 of 4 pages


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