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


                          SCHEDULE 13D/A


            Under the Securities Exchange Act of 1934
                     (Amendment No. 1)*


                        O.I. Corporation
- -----------------------------------------------------------
                        (Name of Issuer)



              Common Stock, par value $.01 per share
- -----------------------------------------------------------
                  (Title of Class of Securities)


                         670-841-10-5
           -------------------------------------------
                         (CUSIP Number)



                            W.W. Botts,
                         O.I. Corporation,
                   151 Graham Road, P.O. Box 9010
                 College Station, Texas  77842-9010
- -----------------------------------------------------------
  Name, Address and Telephone Number of Person Authorized
          to Receive Notices and Communications)


                            5/11/95
- -----------------------------------------------------------
  (Date of Event which Requires Filing of this Statement)


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If the filing person has previously filed a statement on 
Schedule 13G to report the acquisition which is the subject 
of this Schedule 13D, and is filing this schedule because 
of Rule 13d-1(b)(3) or (4), check the following box (   ) .

Check the following box if a fee is being paid with the 
statement (  ) .  (A fee is not required only if the 
reporting person:  (1) has a previous statement on file 
reporting beneficial ownership of more than five percent of 
the class of securities described in Item 1; and (2) has 
filed no amendment subsequent thereto reporting beneficial 
ownership of five percent or less of such class.)  (See 
Rule 13d-7.)

Note:  Six copies of this statement, including all 
exhibits, should be filed with the Commission.  See Rule 
13d-1(a) for other parties to whom copies are to be sent.

*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).


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- -----------------------------------------------------------
1.  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Gary D. Sides
- -----------------------------------------------------------
2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* 

    (a)   [    ]
    (b)   [    ]
- -----------------------------------------------------------
3.  SEC USE ONLY
- -----------------------------------------------------------
4.  SOURCE OF FUNDS*        00  (SEE ITEM 3)
- -----------------------------------------------------------
5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS 
    REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)        [  ]   [  ]
- -----------------------------------------------------------
6.  CITIZENSHIP OR PLACE OF ORGANIZATION

    U.S.
- -----------------------------------------------------------
NUMBER OF SHARES  7.  SOLE VOTING POWER 162,658 shares
                      -------------------------------------
BENEFICIALLY      8.  SHARED VOTING POWER
                      (See Item 5 below)
OWNED BY EACH         -----------------------------------
                  9.  SOLE DISPOSITIVE POWER 162,658 shares
REPORTING             -------------------------------------
                 10.  SHARED DISPOSITIVE POWER
PERSON WITH           (See Item 5 below)
- -----------------------------------------------------------

11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING 
     PERSON
     162,658 shares  (See Item 5 below)
- -----------------------------------------------------------

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
     CERTAIN SHARES  [   ]            [   ]
- -----------------------------------------------------------

13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     3.95%
- -----------------------------------------------------------

14.  TYPE OF REPORTING PERSON
     IN
- -----------------------------------------------------------
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        AMENDMENT NO. 1 TO REPORT ON SCHEDULE 13D      


Item 1.  SECURITY AND ISSUER

     This statement relates to the shares of common stock, 
par value $.01 per share (the "Common Stock"), of O.I. 
Corporation, an Oklahoma corporation (the "Company"), 
which has its principal executive offices at 151 Graham 
Road, P.O. Box 9010, College Station, Texas  77842-9010.

Item 2.  IDENTITY AND BACKGROUND

     This statement is filed by Gary D. Sides ("Sides") 
whose address is 2009 Sweetgum Drive, Birmingham, Alabama  
35244.

     Sides is filing this amendment to reflect a change in 
the number of shares of Common Stock owned by him.

     During the last five years, Sides has not been a 
party to any proceeding or been subject to any judgment, 
decree or final order with respect to any federal or state 
securities laws.

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Item 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     Sides received 327,658 shares of Common Stock 
pursuant to the terms of a Stock Purchase Agreement dated 
January 4, 1994 (the "Agreement") by and among the 
Company, Sides and the other shareholders of CMS Research 
Corporation, an Alabama corporation ("CMS").  Pursuant to 
the terms of the Agreement, CMS shareholders sold all of 
their shares of CMS to the Company in exchange for the 
issuance to the shareholders of CMS of 650,000 shares of 
Common Stock of the Company.  On May 11, 1995, Sides sold 
165,000 of the shares originally received by him pursuant 
to the Agreement, resulting in the share ownership 
reflected in Item 5 below.

Item 4.  PURPOSE OF TRANSACTION

     Sides purchased the shares of Common Stock reported 
herein solely for the purpose of investment.  Sides may 
make additional purchases of Common Stock either in the 
open market or in private transactions depending on the 
Company's business, prospects and financial condition, the 
market for the Common Stock, general economic conditions, 
money and stock market conditions and other future 
developments.  Additionally, Sides has been granted 
options to purchase 20,000 shares of Common Stock pursuant 
to the Company's employee stock option plan.  The first of 
these shares will vest in 1996 with the remainder vesting 
according to a schedule over the next five years (1996, 
20%; 1997, 40%; 1998, 60%; 1999, 100%).

Item 5.  INTEREST IN SECURITIES OF THE ISSUER


         (a) & (b)


    Reporting Person      Beneficially Owned      of Class
    ----------------      ------------------      --------
                                            
     Gary D. Sides              162,658             3.95%



     (c)  Not applicable.

     (d)  Sides does not beneficially own any Common Stock 
of the Company except as set forth above.  To the best of 
the knowledge of Sides, no persons other than himself has 
the right to receive or the power to direct the receipt of 
dividends from, or the proceeds from the sale of, the 
shares of Common Stock beneficially owned by him.

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Item 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR 
         RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE 
         ISSUER

     Sides has received options to purchase 20,000 shares 
of the Company's Common Stock pursuant to the Company's 
employee stock option plan.  See Item 4.

Item 7.  MATERIAL TO BE FILED AS EXHIBITS

     N/A


                       SIGNATURE


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

Dated:  June 8, 1995





                                /s/  Gary D. Sides
                              ----------------------------
                                     Gary D. Sides