UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13G
                                 (Rule 13d-102)

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

                             REX Stores Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                   761624105
- --------------------------------------------------------------------------------
                                 (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
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 of 6 pages

                                 SCHEDULE 13G
CUSIP No. 761624105
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Granahan Investment Management, Inc.
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group*                  a.  |_|

      Not applicable.                                                    b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of       
   Shares               10,000
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             -0-
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        522,200
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        -0-
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      522,200
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|

- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      5.61%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 6 pages

      Item 1(a)   Name of Issuer

                  REX Stores Corporation

      Item 1(b)   Address of Issuer's Principal Executive Offices

                  2875 Needmore Road
                  Dayton, OH 45414

      Item 2(a)   Name of Person Filing

                  Granahan Investment Management, Inc.

      Item 2(b)   Address of Principal Business Office or, if none, Residence

                  275 Wyman Street, Suite 270
                  Waltham, MA 02154

      Item 2(c)   State of Organization/Citizenship

                  Commonwealth of Massachusetts

      Item 2(d)   Title of Class of Securities

`                 Common Stock

      Item 2(e)   CUSIP Number

                  761624105

      Item 3.     If this statement is filed pursuant to Rules 13d-1(b), or
                  13d-2(b), check whether the person filing is a

            (a)   [ ]   Broker or Dealer registered under Section 15 of the
                        Act

            (b)   [ ]   Bank as defined in Section 3(a)(6) of the Act

            (c)   [ ]   Insurance Company as defined in Section 3(a)(19) of
                        the Act

            (d)   [ ]   Investment Company registered under Section 8 of the
                        Investment Company Act

            (e)   [X]   Investment Adviser registered under Section 203 of
                        the Investment Advisers Act of 1940

            (f)         [ ] Employee Benefit Plan, Pension Fund which is subject
                        to the provisions of the Employee Retirement Income
                        Security Act of 

                               Page 3 of 6 pages

                        1974 or Endowment Fund; see ss.240.13d-1(b)(1)(ii)(F)

            (g)   [ ]   Parent Holding Company, in accordance with
                        ss.240.13d-1(b)(1)(ii)(G)

            (h)   [ ]   Group, in accordance with ss.240.13d-1(b)(1)(ii)(H)

      Item 4.     Ownership

            (a)   Amount Beneficially Owned: 522,200

            (b)   Percent of Class: 5.61%

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

                  (i)   sole power to vote or to direct the vote: 10,000

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

                  (iii) sole power to dispose or to direct the disposition
                        of: 522,200

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

      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

                  Certain other persons have the right to receive or the power
                  to direct the receipt of dividends from, or the proceeds from
                  the sale of, the class of securities which are subject to this
                  report.

      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.

                               Page 4 of 6 pages

      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 5 of 6 pages

      Signature

      After reasonably 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.

                                     GRANAHAN INVESTMENT MANAGEMENT, INC.

Date: January 31, 1997                    By:   /s/ John J. Granahan
                                             -----------------------------
                                               John J. Granahan, President

                               Page 6 of 6 pages