WITCO CORP
SC 13G, 1998-07-13
INDUSTRIAL ORGANIC CHEMICALS
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<PAGE>
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G
                                 (RULE 13d-102)

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*


                               Witco Corporation
        _______________________________________________________________
                                (Name of Issuer)


                                  Common Stock
        ________________________________________________________________
                         (Title of Class of Securities)


                                   977385103
                         _____________________________
                                 (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
disclosures provided in a prior cover page.

The information required on 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).

                                  1 of 4 Pages
<PAGE>
 
                                   SCHEDULE 13G
- -------------------------------                          ---------------------
  CUSIP No.  97738103                                      PAGE 2 OF 4 PAGES
- --------------------------------                         ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Barrow, Hanley, Mewhinney & Strauss, Inc.
             75-2403190                    

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
         A Nevada corporation

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5     
     NUMBER OF               912,000 shares
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                            5,616,300 shares
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING                6,258,300 shares
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                          --
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9     
      6,258,300 shares

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                                                                  [_]
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11    
      11.3%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                  2 of 4 Pages
<PAGE>
 
                                 SCHEDULE 13G
                                 ------------


Item 1(a)  Name of Issuer:
             Witco Corporation

     1(b)  Address of Issuer's Principal Executive Offices:
             One American Way
             Greenwich, CT  0683l

Item 2(a)  Name of Person Filing:
             Barrow, Hanley, Mewhinney & Strauss, Inc.

     2(b)  Address of Principal Business Office or, if none, Residence:
             One McKinney Plaza
             3232 McKinney Avenue, 15th Floor
             Dallas, TX  75204-2429

     2(c)  Citizenship:
             A Nevada corporation

     2(d)  Title of Class of Securities:
             Common Stock

     2(e)  CUSIP Number:
             977385103

Item 3  If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b):
                The reporting person is an Investment Adviser registered under
                Section 203 of the Investment Advisers Act of 1940.

Item 4  Ownership:

      4(a)  Amount beneficially owned:
             6,258,300 shares

     4(b)  Percent of Class:
             11.3%

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

        (i) sole power to vote or to direct the vote:
                  912,000 shares

                                  3 of 4 Pages
<PAGE>
 
        (ii) shared power to vote or to direct the vote:
                  5,616,300 shares

        (iii) sole power to dispose or to direct the disposition of:
                  6,258,300 shares

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

Item 5  Ownership of Five Percent or Less of a Class:
             Not Applicable.

Item 6  Ownership of More than Five Percent on Behalf of Another Person:
                The right to receive or the power to direct the receipt of
                dividends from, or the proceeds from the sale of, the common
                stock is held by certain clients of the reporting person, none
                of which has such right or power with respect to five percent or
                more of the common stock.

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 the undersigned certifies that, to the best of its
        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 purpose or effect.

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.

                                 BARROW, HANLEY, MEWHINNEY &
                                 STRAUSS, INC.


                                 By:    /s/ Bryant M. Hanley, Jr.
                                    ---------------------------------------
                                    Name: Bryant M. Hanley, Jr.
                                    Title:   President

July 13, 1998

                                  4 of 4 Pages


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