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

                          SCHEDULE 13G

            Under the Securities Exchange Act of 1934

                         Amendment No. 3

                       MALLINCKRODT, INC.
                         (Name of Issuer)


                          COMMON STOCK
                 (Title of Class of Securities)


                            561232109
                         (CUSIP Number)


Check the following box if a fee is being paid with this
statement (    ).






SCHEDULE 13G
Amendment No. 3

MALLINCKRODT, INC.
(Name of Issuer)

COMMON STOCK
(Title of Class of Securities)

561232109
(CUSIP Number)


(1)  Names of Reporting Persons S.S. or I.R.S. Identification
Nos. of Above Persons

     Trimark Financial Corporation
                                                            
(2)  Check the Appropriate Box if a Member of a Group

     (a)
     (b)  (x)
                                                            
(3)  SEC Use Only

                                                            
(4)  Citizenship or Place of Organization

     Trimark Financial Corporation is a corporation incorporated
under the
     laws of Ontario, Canada
                                                            

Number of      (5)  Sole Voting Power             8,832,000
shares
Shares                                                      
Benefici-      (6)  Shared Voting Power      NIL
ally Owned                                             
by Each        (7)  Sole Dispositive Power        8,832,000
shares
Reporting                                              
Person With    (8)  Shared Dispositive Power NIL

                                                       
(9)  Aggregate Amount Beneficially Owned by Each Reporting Person

                        8,832,000 shares
               
(10) Check if the Aggregate Amount in Row (9) Excludes Certain
Shares

                         Not applicable

(110 Percent of Class Represented by Amount in Row 9

              12.1  % of outstanding common shares

(12) Type of Reporting Person           HC  (see item 2A)

Item 1(a)

Name of Issuer:     Mallinckrodt, Inc.




Item 1(b)

Address of Issuer's Principal Executive Offices:

   7733 Forsyth Boulevard
   St. Louis, Missouri 63105-1820
Item 2(a)

Name of Person Filing:

Certain Trimark mutual funds (the Funds), which are trusts
organized under the laws of Ontario, Canada, are owners of record
of the securities covered by this report.  Trimark Investment
Management Inc. (TIMI), a corporation incorporated under the laws
of Canada, is a manager and trustee of the Funds.  TIMI is
qualified to act as an investment adviser and manager of the
Funds in the province of Ontario pursuant to a registration under
the Securities Act (Ontario).  Trimark Financial Corporation
(TFC) is a corporation incorporated under the laws of Ontario,
Canada.  It owns 100% of the voting equity securities of TIMI. 
Consequently, TFC may be deemed to be the beneficial owner of
such securities.


Item 2(b)

Address of Principal Business Office:

One First Canadian Place
Suite 5600, P.O. Box 487
Toronto, Ontario
M5X 1E5

(416) 362-7181



Item 2(c)

Citizenship:

   Trimark Financial Corporation - Incorporated under the laws
of Ontario,
   Canada
   Trimark Investment Management Inc. - Incorporated under the
laws of
   Canada

   Trimark mutual funds - mutual fund trusts organized under the
   laws of Ontario



Item 2(d)

Title of Class of Securities: common stock



Item 2(e)

CUSIP Number:       561232109

                                                  

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

   (g)  (x )   Parent Holding Company, in accordance with
240.13d-1(b)
               (ii)(G) (Note:  See Item 7)

   (h)  (   )  Group, in accordance with 240.13d-1(b) (ii)(H)

               (see item 2A)

Item 4

Ownership.

   (a)  Amount Beneficially Owned*:

               8,832,000      shares

   (b)  Percent of Class:

               12.1      %

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

        (i) sole power to vote or to direct the vote:  (TFC)     
8,832,000
        (ii) shared power to vote or to direct the vote:    NIL
        (iii) sole power to dispose or to direct the
              disposition of: (TFC)                    8,832,000
        (iv) shared power to dispose or to direct the
             disposition of:                      NIL

        *      (see item 2(a))



                                                                 

Item 5

Ownership of Five Percent or Less of a Class

   Inapplicable

                                                                 

Item 6

Ownership of More than Five Percent on Behalf of Another Person

   Inapplicable

                                                                 

Item 7

Identification and Classification of the Subsidiary which
Acquired the Security Being Reported on By the Parent Holding
Company.

   See item 2(a)

                                                                 

Item 8

Identification and Classification of Members of the Group.

   Inapplicable

                                                                 

Item 9

Notice of Dissolution of Group.

   Inapplicable

                                                                 


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.

Signature.

   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.

Date:   February 11, 1998


Signature:                                        

Name/Title:    Michael Kevin Feeney, Chief Financial Officer, on
behalf of 
               Trimark Financial Corporation in its capacity as
a  "Reporting 
               Person" herein.


               Attention:  Intentional misstatements or
omissions of fact 
               constitute Federal criminal violations (See 18
U.S.C. 1001).