CIBC WOOD GUNDY VENTURES INC ET AL
SC 13G, 1997-02-21
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                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549


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



                                 SCHEDULE 13G

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                            (AMENDMENT NO.      )*




- ------------------------------------------------------------------------------
                                Thermatrix Inc.
                               (Name of issuer)



- ------------------------------------------------------------------------------
                                 Common Stock
                        (Title of class of securities)



- ------------------------------------------------------------------------------
                                   883550105
                                (CUSIP number)

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



                       (Continued on following page(s))

                              (Page 1 of 5 Pages)
- --------
* 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 or otherwise  subject to the  liabilities of that section of the Act
but shall be subject to all other provisions of the Act.


<PAGE>




        CUSIP No. 88350105                                     Page 2 of 5 Pages


                                      13G

- --------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSONS
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
              CIBC Wood Gundy Ventures, Inc.
              EIN: 13-3621198
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) |_|
                                                                    (b) |x|
- --------------------------------------------------------------------------------
  3     SEC USE ONLY

- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION
              Delaware
- --------------------------------------------------------------------------------
    NUMBERS OF              5     SOLE VOTING POWER
                                        761,906 Common Shares
      SHARES             -------------------------------------------------------
                            6     SHARED VOTING POWER                           
   BENEFICIALLY                         N/A                                     
                         -------------------------------------------------------
   OWNED BY EACH            7     SOLE DISPOSITIVE POWER                        
                                        761,906 Common Shares                   
     REPORTING           -------------------------------------------------------
                            8     SHARED DISPOSITIVE POWER                      
    PERSON WITH                         N/A                                     
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
              761,906 Common Shares
- --------------------------------------------------------------------------------
  10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES*                                             |_|
- --------------------------------------------------------------------------------
  11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
              10.2%
- --------------------------------------------------------------------------------
  12    TYPE OF REPORTING PERSON*
              Corporation
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                                      Page 3  of 5 Pages




Item 1.

      (a) Name of Issuer: Thermatrix Inc., a California corporation

      (b) Address of Issuer's  Principal  Executive  Offices:  101 Metro  Drive,
          Suite 248, San Jose, California 95110.

Item 2.

      (a) Name of Person  Filing:  This Statement on Schedule 13G is being filed
          by CIBC Wood Gundy Ventures, Inc. (the "Reporting Person").

      (b) Address of Principal  Business Office:  The principal business address
          of the Reporting  Person is 425 Lexington  Avenue,  New York, New York
          10017.

      (c) Citizenship:  The Reporting Person was organized under the laws of the
          State of Delaware.

      (d) Title of Class of Securities:  common stock, $.001 par value per share
          (the "Common Stock").

      (e) CUSIP Number: 883550105

Item 3.

      Not applicable.

Item 4.  Ownership

      (a) Amount Beneficially Owned: 761,906 shares of Common Stock.

      (b) Percent of Class:  10.2%  (based on  7,466,683  shares of Common Stock
          reported outstanding as of December 31, 1996).

      (c) Number of shares as to which such person has:

            (i)   sole power to vote or to direct the vote:  761,906

            (ii)  shared power to vote or to direct the vote:  0

            (iii) sole power to dispose or to direct the disposition of: 761,906

            (iv)  shared power to dispose or to direct the disposition of:  0





<PAGE>


                                                      Page 4  of 5 Pages




Item 5.  Ownership of Five Percent or Less of a Class

      Not applicable.

Item 6.  Ownership of Five Percent or Less of a Class

      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

      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>


                                                      Page 5  of 5 Pages



                                      SIGNATURE




      After reasonable  inquiry and to the best of its knowledge and belief, the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.




Date:  February 14, 1997


                                          CIBC WOOD GUNDY VENTURES, INC.


                                          By:       /s/ Robi Blumenstein
                                                Name:  Robi Blumenstein
                                                Title: Managing Director




<PAGE>




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