U.S. SECURITIES AND EXCHANGE COMMISSION
                     WASHINGTON, D.C. 20549

                            FORM 12b-25
                                                                  
                                   Commission File Number 1-483
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                   NOTIFICATION OF LATE FILING
(Check One): (  ) Form 10-K and Form 10-KSB (  ) Form 20-F
(  ) Form 11-K ( X ) Form 10-Q and Form-10-QSB (  ) Form N-SAR
For Period Ended:          December 31, 1998
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(   ) Transition Report on Form 10-K
(   ) Transition Report on Form 10-Q
(   ) Transition Report of Form 20-F                             
(   ) Transition Report on Form N-SAR
(   ) Transition Report on Form 11-K
For the Transition Period Ended:
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Read attached instruction sheet before preparing form.  Please
print or type.
     Nothing in this form shall be construed to imply that the
Commission has verified any information contained herein.
     If the notification relates to a portion of the filing
checked above, identify the Item(s) to which the notification
relates:

                   Part I--Registrant Information

Full name of registrant            Mallinckrodt Inc.
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Former name if applicable 
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Address of principal executive office (Street and number)

                               675 McDonnell Blvd.
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City, State and Zip Code       St. Louis, Missouri    63134
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                   Part II--Rules 12b-25 (b) and (c)
If the subject report could not be filed without unreasonable
effort or expense and the registrant seeks relief pursuant to
Rule 12b-25(b), the following should be completed.  (Check box if
appropriate)
(X)  (a) The reasons described in reasonable detail in Part III   
     of this form could not be eliminated without unreasonable    
     effort or expense;
(X)  (b) The subject annual report, semi-annual report,           
     transition report on Form 10-K, 20-F, 11-K or Form N-SAR, or 
     portion thereof will be filed on or before 15th calendar day 
     following the prescribed due date; or the subject quarterly  
     report or transition report on Form 10-Q, or portion thereof 
     will be filed on or before the fifth calendar day following  
     the prescribed due date; and
( )  (c) The accountant's statement or other exhibit required by  
     Rule 12b-25(c) has been attached if applicable.

                         
                        Part III--Narrative
State below in reasonable detail the reasons why Form 10-K and
Form 10-KSB, 11-K, 20-F, 10-Q and Form 10-QSB, N-SAR or the
transition report or portion thereof could not be filed within
the prescribed time period.  (Attach extra sheets if needed.)

On January 26, 1999, the Company concluded discussions with the
staff of the Securities and Exchange Commission regarding the
purchase price allocation related to the acquisition of Nellcor
Puritan Bennett Incorporated in August 1997.  As a result of
these discussions, the Company has agreed to restate the amount
of purchase price allocated to purchased research and
development.  Therefore, the Company is in the process of
preparing Form 10-K/A No. 1 for the year ended June 30, 1998, and
Form 10-Q/A No. 1 for the quarterly period ended September 30,
1998 to reflect this change.  Because of the efforts underway to
amend these previous filings, the Form 10-Q for the quarterly
period ended December 31, 1998 could not be filed on a timely
basis.  The Company expects to file its Form 10-Q for the
quarterly period ended December 31, 1998 by February 19, 1999.


                      Part IV--Other Information
     (1)  Name and telephone number of person to contact in
regard to this notification
     Michael A. Rocca           314              654-2000        
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        (Name)              (Area code)     (Telephone number)
     (2)  Have all other periodic reports required under Section
13 or 15(d) of the Securities Exchange Act of 1934 or Section 30
of the Investment Company Act of 1940 during the preceding 12
months or for such shorter period that the registrant was
required to file such report(s) been filed:  If the answer is no,
identify report(s).                                               
                    (X) Yes    (   ) No
     (3)  Is it anticipated that any significant change in
results of operations from the corresponding period for the last
fiscal year will be reflected by the earnings statements to be
included in the subject report or portion thereof?
                    (X) Yes    (   ) No
     If so: attach an explanation of the anticipated change, both
narratively and quantitatively, and, if appropriate, state the
reasons why a reasonable estimate of the results cannot be made.

     As a result of discussions with the staff of the Securities
and Exchange Commission, the amount of purchased research and
development charged to operations related to the acquisition of
Nellcor Puritan Bennett Incorporated in the first quarter of
fiscal year 1998 of $398.3 million has been reduced by $90
million to $308.3 million.  A corresponding $90 million increase
in goodwill is being amortized over the previously established
30-year amortization period beginning in September 1997.


                         Mallinckrodt Inc.
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           (Name of registrant as specified in charter)
Has caused this notification to be signed on its behalf by the
undersigned thereunto duly authorized.

Date  February 12, 1999        By /s/ MICHAEL A. ROCCA
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                                      Michael A. Rocca
                                   Senior Vice President and      
                                   Chief Financial Officer