NORTHERN TRUST CORP
SC 13G, 1998-02-17
STATE COMMERCIAL BANKS
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                                                                     Pg. 1 
                      SECURITIES AND EXCHANGE COMMISSION
                                        
                             Washington, DC  20549

                                 SCHEDULE 13G
                                        

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



                                    Isocor
                                    ------
                               (Name of Issuer)


                           Common Stock, $0.001 Par
                            ------------------------
                         (Title of Class of Securities)


                                   464902105
                                   ---------
                                (CUSIP Number)


Check the following box if a fee is being paid with this statement [ ]. (A fee
is not required only if the filing 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.)
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  464902105              13G                    PAGE 2 OF 6 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          Northern Trust Corporation         36-2723087                        
          The Northern Trust Company         36-1561860
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2        Not Applicable                                        (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4        Northern Trust Corporation--a Delaware corporation with principal 
          offices in Chicago, Illinois


- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5             511,770                                   
     NUMBER OF            
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6                   0
                          
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7                   0
    REPORTING             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8                   0
                          
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9        511,770            

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10        Not Applicable
                                                                    [_]
      
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11        5.41
                                                                         

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12        Northern Trust Corporation HC
      

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


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                                                                           Pg. 3
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC  20549
                                        
             SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                             
Check the following box if a fee is being paid with statement [_].

1. (a)  Isocor
        ------
        (Name of Issuer)

   (b)  3420 Ocean Park Blvd., Santa Monica, CA  90405, USA
        ---------------------------------------------------
       (Address of Issuer's Principal Executive Office)

2. (a)  Northern Trust Corporation
        --------------------------
        (Name of Person Filing)

   (b)  50 South LaSalle Street, Chicago, Illinois 60675
        ------------------------------------------------
       (Address of Person Filing)
 
   (c)  U.S. (Delaware Corporation)
        ---------------------------
        (Citizenship)
 
   (d)  Common Stock, $0.001 Par
        ------------------------   
       (Title of Class of Securities)
 
   (e)  464902105
        ---------                   
        (CUSIP Number)

3. This statement is being filed by Northern Trust Corporation as a Parent
   Holding Company in accordance with S240.13d-1(b) (1) (ii) (G).

4. (a)  511,770
        -------                    
        (Amount Beneficially Owned)
 
   (b)  5.41
        ----                        
        (Percent of Class)

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

       (i)     511,770
               -------
             (Sole Power to Vote or to Direct the Vote)
 
       (ii)    0
               -      
             (Shared Power to Vote or to Direct the Vote)
 
       (iii)   0
               -      
             (Sole Power to Dispose or Direct Disposition)

       (iv)    0
               -
             (Shared Power to Dispose or Direct Disposition)
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                                                                           Pg. 4
            
5. 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 5 percent of the class of securities, check the following: [_]

6. Statement regarding ownership of 5 percent or more on behalf of another
   person:



7. Parent Holding Company reporting on behalf of the following subsidiaries, all
   of which are banks as defined in Section 3(a) (6) of the Act:

   The Northern Trust Company
   50 South LaSalle Street
   Chicago, IL  60675

8. Identification and Classification of Members of the Group.

                                Not Applicable.

9. Notice of Dissolution of Group.

                                Not Applicable.

10. 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 purpose or effect.
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                                                                           Pg. 5
        
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.


                                       NORTHERN TRUST CORPORATION


                                       By:  Perry R. Pero
                                            -------------

DATED:  2-13-98                        As its:  Sr. Executive Vice President
        -------                                 ----------------------------
<PAGE>
                                                                           Pg. 6
 
                            EXHIBIT TO SCHEDULE 13G
                      FILED BY NORTHERN TRUST CORPORATION
                                                 

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC  20549-1004
Attention: Filing Desk, Stop 1-4

                                  RE:  Isocor
                                       ------
                                        
     Pursuant to the requirement of 240.13d-1(e) (1) (iii), this exhibit shall
constitute our written agreement that the Schedule 13G to which this exhibit is
attached is filed on behalf of Northern Trust Corporation and of its
subsidiary(ies), as stated below, regarding our respective beneficial ownership
in the above-captioned equity security.

                                       NORTHERN TRUST CORPORATION


                                       By:  Perry R. Pero
                                            -------------

DATED:  2-13-98                        As its:  Sr. Executive Vice President
        -------                                 ----------------------------


The NORTHERN TRUST COMPANY

By: Perry R. Pero
- -----------------
As its Sr. Executive Vice President
       ----------------------------
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                                                                           Pg. 6
 
                           THE NORTHERN TRUST COMPANY
                           Fifty South LaSalle Street
                            Chicago, Illinois 60675

          

                                       February 13, 1998



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC  20549-1004

ATTN:  Filing Desk, Stop 1-4

Gentlemen:

Enclosed is the Schedule 13G filing for Isocor.  Any inquiries
may be directed to me at (312) 444-7065.

                                       Sincerely,

                                       Oscar Teran
                                       Trust Officer


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