HOLOGIC INC
SC 13G/A, 1999-11-18
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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- - --------------------------------                 -------------------------------

      CUSIP NO. 436440101              13G                  PAGE 1 OF 9 PAGES
- - --------------------------------                 -------------------------------



                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                                (AMENDMENT NO. 1)

                                  HOLOGIC, INC.
                                  -------------

                                (NAME OF ISSUER)

                     COMMON STOCK, $0.01 PAR VALUE PER SHARE
                     ----------------------------------------

                         (TITLE OF CLASS OF SECURITIES)

                                   436440101
                                   ----------

                                 (CUSIP NUMBER)

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).


<PAGE>



- - --------------------------------------------------------------------------------
  1       NAME OF REPORTING PERSONS

          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

          EQSF ADVISERS, INC.

          (EIN 13-3354359)

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a)  [   ]
                                                                  (b)  [   ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  3       SEC USE ONLY

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

                      NEW YORK CORPORATION

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
                                  5      SOLE VOTING POWER

                                                  0

           NUMBER OF

                                ------------------------------------------------
                                ------------------------------------------------
            SHARES                6      SHARED VOTING POWER

         BENEFICIALLY

           OWNED BY                                      NONE

                                ------------------------------------------------
                                ------------------------------------------------
             EACH                 7      SOLE DISPOSITIVE POWER

           REPORTING

            PERSON                                0

                                ------------------------------------------------
                                ------------------------------------------------
             WITH                8       SHARED DISPOSITIVE POWER

                                                          NONE

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                   0

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
          CERTAIN SHARES*                                               [    ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 11
                   0.0%

- - --------------------------------------------------------------------------------
          TYPE OF REPORTING PERSON*

 12

                   IA

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

*SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>



- - --------------------------------------------------------------------------------
  1       NAME OF REPORTING PERSONS

          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

          M.J. WHITMAN ADVISERS, INC.

          (EIN 13-3686379)

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                    (b)  [   ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  3       SEC USE ONLY

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

                      NEW YORK CORPORATION

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
                                  5      SOLE VOTING POWER

                                                  187,100

           NUMBER OF

                                ------------------------------------------------
                                ------------------------------------------------
            SHARES                6      SHARED VOTING POWER

         BENEFICIALLY

           OWNED BY                                    NONE

                                ------------------------------------------------
                                ------------------------------------------------
             EACH                 7      SOLE DISPOSITIVE POWER

           REPORTING

            PERSON                                187,100

                                ------------------------------------------------
                                ------------------------------------------------
             WITH                8       SHARED DISPOSITIVE POWER

                                                       NONE

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                   187,100

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
          CERTAIN SHARES*                                              [    ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

 11

                   1.23%

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
          TYPE OF REPORTING PERSON*

 12

                   IA

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>



- - --------------------------------------------------------------------------------
  1       NAME OF REPORTING PERSONS

          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

                   MARTIN J. WHITMAN

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a)  [   ]
                                                                   (b)  [   ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
  3       SEC USE ONLY

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

                   USA

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
                                  5      SOLE VOTING POWER

           NUMBER OF                              NONE  (SEE ITEM 4)

                                ------------------------------------------------
                                ------------------------------------------------
                                  6      SHARED VOTING POWER

            SHARES

                                                  NONE

         BENEFICIALLY

           OWNED BY

                                ------------------------------------------------
                                ------------------------------------------------
             EACH                 7      SOLE DISPOSITIVE POWER

           REPORTING                              NONE  (SEE ITEM 4)

                                ------------------------------------------------
                                ------------------------------------------------
          PERSON WITH            8       SHARED DISPOSITIVE POWER

                                                  NONE

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                   -0-    (SEE ITEM 4)

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
          CERTAIN SHARES*                                                [  ]

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                   -0-

- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 12       TYPE OF REPORTING PERSON*

                   IN

- - --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

ITEM 1.

         (a)      Name of Issuer:
                  ---------------
                  Hologic, Inc. (the "Issuer").

         (b)      Address of Issuer's Principal Executive Offices:
                  ------------------------------------------------
                   590 Lincoln Street, Waltham, MA  02154

ITEM 2.

         (a)      Name of Person Filing:
                  ----------------------

                  This schedule is being jointly filed by EQSF Advisers,  Inc.
 ("EQSF"),  M.J.  Whitman  Advisers,  Inc.  ("MJWA") and Martin J. Whitman,
the Chief Executive  Officer of EQSF and MJWA and controlling  person of EQSF
and MJWA.  (EQSF,  MJWA and Martin J. Whitman  are  sometimes  collectively
referred  to  hereinafter  as  "Filer").  Attached  hereto as an  exhibit is a
copy of the joint Schedule 13G filing agreement among the reporting persons.

         (b)      Address of Principal Business Office:
                  -------------------------------------

                  The address of the principal  executive  office of EQSF,
MJWA and Mr.  Whitman is: 767 Third Avenue,  New York,  New York 10017-2023.

         (c)      Citizenship:
                  ------------

                  The  citizenship  or  place  of  organization  of  each of the
reporting persons is as follows:

                  EQSF
                  -----

                  New York State corporation.

                  MJWA
                  -----

                  New York State corporation.

                  MARTIN J. WHITMAN
                  ------------------

                  United States citizen.

         (d)      TITLE OF CLASS OF SECURITIES:

                  Common Stock, $.01 par value per share.
<PAGE>


         (e)      CUSIP NUMBER:
                  --------------

                  436440101

ITEM 3. If This  Statement  is  Being  Filed  Pursuant  to  Rules  13D-1(b),  or
        ------------------------------------------------------------------------
13D-2(b), Check Whether the Person Filing is A:
- - -----------------------------------------------

                  (e)      Investment Adviser Registered Under Section 203 of
the Investment Advisers Act Of 1940 (EQSF AND MJWA).
                                     ----     -----

ITEM 4.  Ownership.
         ---------

                  (a) & (b) EQSF beneficially owns zero shares, or 0.0% of the
class of securities of the issuer.  MJWA beneficially owns 187,700 shares, or
1.23% of the class of securities of the issuer.

                  (c)  (i) EQSF:  0
                           MJWA:  187,700

                      (ii) Not applicable.

                      (iii)EQSF:  0
                           MJWA:  187,700

                      (iv) Not applicable.

         Mr. Whitman disclaims beneficial ownership of all such shares.

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.

<PAGE>


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 Group.
         -------------------------------
                  Not applicable.

ITEM 10. Certification.
         --------------

                  By signing  below I certify  that, to the best of my knowledge
and  belief,  the  securities  referred to above were  acquired in the  ordinary
course of business  and were not acquired for the purpose of and do not have the
effect of changing or influencing  the control of the issuer of such  securities
and were not acquired in connection  with or as a participant in any transaction
having such purposes or effect.


<PAGE>

                                    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.

                                         NOVEMBER 18, 1999
                                         -------------------
                                             (Date)

                                         EQSF ADVISERS, INC.

                                         BY:/S/   MARTIN J. WHITMAN
                                         --------------------------
                                         Martin J. Whitman
                                         Chairman, and Chief Executive Officer



                                         M.J. WHITMAN ADVISERS, INC.
                                         ---------------------------
                                         BY:/S/ MARTIN J. WHITMAN



                                         /S/MARTIN J. WHITMAN
                                         ---------------------
                                         Martin J. Whitman




                                                            Exhibit 1
                                                            ----------



                             JOINT FILING AGREEMENT
                             ----------------------

                  In  accordance  with  Rule  13d-1  (f)  under  the  Securities
Exchange  Act of 1934,  as amended,  the  undersigned  hereby agree to the joint
filing  with all  other  Reporting  Entities  (as such  term is  defined  in the
Schedule  13G)  on  behalf  of  each of them  of a  statement  on  Schedule  13G
(including amendments thereto) with respect to the Common Stock, $0.01 par value
per share,  of Hologic,  Inc., and that this Agreement be included as an Exhibit
to  such  joint  filing.  This  Agreement  may  be  executed  in any  number  of
counterparts  all of which  taken  together  shall  constitute  one and the same
instrument.

                  IN  WITNESS  WHEREOF,  the  undersigned  hereby  execute  this
Agreement this 18th day of November, 1999.

                                        EQSF ADVISERS, INC.

                                        BY:/S/   MARTIN J. WHITMAN
                                        ---------------------------
                                        Martin J. Whitman
                                        Chairman, and Chief Executive Officer

                                        M. J. WHITMAN ADVISERS, INC.

                                        BY:/S/ MARTIN J. WHITMAN
                                        ------------------------
                                        Martin J. Whitman
                                        Chairman and Chief Executive Officer

                                        /S/MARTIN J. WHITMAN
                                        --------------------
                                        Martin J. Whitman


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