Document:

Exhibit 10.24

November 15, 1999

Ronald G. Evens, M.D., President
Barnes-Jewish Hospital
One Barnes-Jewish Hospital Plaza
St. Louis, MO  63110

Dear Dr. Evens:

This letter agreement, which supersedes all other agreements and
renewals thereto on this subject is for the purpose of stating the
terms and conditions under which you agree to serve Mallinckrodt Inc.,
a Delaware corporation, (hereinafter MALLINCKRODT) in a consulting
capacity.

You agree to serve MALLINCKRODT in a consulting capacity during the
period commencing on January 1, 2000 and ending on December 31, 2000.
It is understood that you may terminate this Agreement at any time
upon thirty (30) days written notice to MALLINCKRODT and that
MALLINCKRODT may terminate this Agreement on ninety (90) days written
notice to you.

During the consulting period you shall serve as an advisor to
MALLINCKRODT and in that capacity you will review and evaluate the
research and development programs and plans of MALLINCKRODT and
provide such other advice and assistance in your general areas of
expertise as may be requested from time to time.  It is understood and
agreed that during the consulting period you will devote two (2) four
(4) hour days each month and such additional hours as may be mutually
agreed upon to the services of MALLINCKRODT.

As consideration for your services hereunder, MALLINCKRODT agrees to
pay you as follows:

     At an annual rate of Forty Thousand Eight Dollars ($40,008.00) in
     twelve (12) monthly installments of Three Thousand Three Hundred
     Thirty-Four Dollars ($3,334.00) each.

It is understood that MALLINCKRODT may designate places and locations
where you will provide your services in a consulting capacity and
where this requires you to travel away from St. Louis, Missouri,
MALLINCKRODT will reimburse you for the reasonable travel and living
expenses incurred by you upon submission by you and approval by
MALLINCKRODT of an itemized account of the expenses for which you seek
reimbursement.

You agree to maintain in confidence and not use except for purposes of
this consulting agreement any confidential information of a business
as well as of a technical nature, disclosed to you by MALLINCKRODT or
developed by you as a result of your services to MALLINCKRODT
hereunder.  Upon termination of this Agreement or any extensions
thereof or at any other time that MALLINCKRODT so requests, you also
agree to transmit to MALLINCKRODT any written, printed or other
materials embodying such confidential information including any copies
or excerpts thereof given to you or prepared by you in connection with
your consulting services for MALLINCKRODT.  It is understood and
agreed that this obligation of confidentiality and non-use shall
continue at all times beyond the consulting period and any extensions
thereof.  This obligation of confidentiality and non-use shall not
apply to information which (1) is or later becomes publicly known
under circumstances involving no breach of this Agreement by you; (2)
was already known to you at the time of receipt of such information
from MALLINCKRODT; or (3) is legally made available to you by a third
party.  Your obligations of confidentiality and non-use shall survive
the expiration or termination of this Agreement.

You agree that during the consulting period you will not enter into
any other consulting agreement in the radiopharmaceutical and contrast
media fields without the prior written consent of MALLINCKRODT which
consent shall not be unreasonably withheld.

It is understood and agreed that any and all inventions and
discoveries whether or not patentable which you conceive and/or make
within the consulting period and any extensions thereof and which
result from information received from MALLINCKRODT or are developed by
you pursuant to your services for MALLINCKRODT shall be the sole and
exclusive property of MALLINCKRODT and that you will upon request by
MALLINCKRODT promptly execute any and all applications, assignments or
other instruments which MALLINCKRODT shall deem necessary or useful in
order to apply for and obtain Letters Patent in the United States and
all other countries for said inventions and discoveries and in order
to assign and convey to MALLINCKRODT the sole and exclusive right,
title and interest in and to said inventions, discoveries, patent
applications and patents thereon.  It is understood that MALLINCKRODT
will bear the cost of preparation of all such patent applications and
assignments and the cost of the prosecution of all such patent
applications in the United States Patent Office and the patent offices
of other countries.

If the foregoing meets with your understanding and approval, please so
indicate by executing this letter in duplicate at the place indicated
below and returning one of the signed duplicates to me.

Very truly yours,                      ACCEPTED & AGREED TO:

MALLINCKRODT INC.                      RONALD G. EVENS, M.D.

By: /s/ C. R. Holman                    /s/ Ronald G. Evens
   --------------------------           --------------------------
   C.R. Holman,                         Dated   11-18-99
   Chief Executive Officer                    --------------------SUPPLEMENTAL RETIREMENT AGREEMENT

  AGREEMENT made on March 24, 2000 between LOEWS CORPORATION (the "Company")
and Peter Keegan (the "Executive").

                              W I T N E S S E T H:

  WHEREAS, the Executive is currently serving as an executive employee of the
Company, and the Company and the Executive desire that the Executive's
retirement benefits be supplemented on the terms and conditions set forth
herein.

  NOW, THEREFORE, the parties agree as follows:

  1.  In connection with his employment by the Company, the Executive shall be
entitled to the following, in addition to his compensation and benefits:

(a)  An account (the "Account") shall be established for the Executive (which
shall not be funded) which may be credited each year commencing in 1999. The
Executive shall become eligible and vested in the Account as of January 1,
1999.

(b)  The Account shall be credited with an initial balance in the amount of
$200,000 as of June 30, 1999.

(c)  The Account shall be credited on the last day of each calendar year with
the Interest Credit which would have been credited under Section 3.3 of the
Loews Corporation Cash Balance Plan (the "Plan"). It is intended that the
Account shall receive one half year's Interest Credit on the last day of
calendar year 1999 for

                                      1

     the initial balance of $200,000 for the calendar year 1999.

(d)  The Account shall be accumulated until the Executive's termination of
employment. At such time, the amount in the Account shall be converted into an
actuarially equivalent annuity, payable at the Executive's election in the
form of a single life annuity, a joint and survivor annuity, or a 10 year
certain annuity, payable monthly. For purposes of this Agreement, the term
"actuarial equivalent" shall have the meaning ascribed to it in Section 1.3 of
the Plan.

  2.  In lieu of the benefits due under the preceding paragraphs, the
Executive may request (at least one year prior to retirement) to receive the
accumulated balance in the Account as a lump sum upon retirement, provided
that such request is approved by the Chief Executive Officer of the Company.

  3.  If the Executive should die before payments have commenced under the
preceding paragraphs, and in lieu of the benefits due under the preceding
paragraphs, the accumulated balance in the Account shall be paid as soon as
practicable after the Executive's death to his wife, Jane L. Carpenter. The
Executive may revoke such beneficiary designation and designate a new
beneficiary or beneficiaries by giving written notice as provided in Paragraph
4 below. Such alternative beneficiary designation must be received prior to
the Executive's death.

                                      2

  4.  All notices, requests, designations and other communications provided
for by this Agreement shall be in writing and shall be personally delivered or
mailed by registered or certified mail to the address of the party to whom
intended as specified below or notice sent in accordance with this Paragraph.

                                         If to the Company, at:

                                               667 Madison Avenue
                                               New York, NY 10021
                                               Attention: Corporate Secretary

                                         If to the Executive, at:

                                               1192 Park Avenue
                                               New York, NY 10012

Any such writings shall be effective upon receipt.

  5.  This Agreement sets forth the entire understanding between the parties
with respect to the subject matter hereof and supersedes all prior
understandings and agreements. No change, termination or waiver of any of the
provisions hereof shall be binding unless in writing and signed by the party
against whom the same is sought to be enforced. The Agreement shall be
governed by and construed in accordance with the laws of the State of New
York.

  IN WITNESS WHEREOF, the parties hereto have caused these presents to be duly
executed as of the day and year first above written.

                                         LOEWS CORPORATION

                                         By:  /s/ James S. Tisch
                                            ------------------------

Accepted and Agreed to:

/s/ Peter W. Keegan
---------------------------
The Executive

                                     3FIRST AMENDMENT TO SUPPLEMENTAL RETIREMENT AGREEMENT
              ----------------------------------------------------

  This shall constitute the First Amendment, made on March 24, 2000, to that
Supplemental Retirement Agreement (the "Agreement") made on September 21, 1999
between Loews Corporation (the "Company") and Arthur Rebell (the "Executive").

                              W I T N E S S E T H:

  WHEREAS, the Executive is currently serving as an executive employee of the
Company, and the Company and the Executive desire that the Executive's
retirement benefits be supplemented on the terms and conditions set forth
herein.

  NOW, THEREFORE, the parties agree as follows:

  Paragraph 1(b) of the Agreement shall be amended by adding a sentence at the
end thereof which shall read as follows:  "The Account shall be credited with
a subsequent balance in the amount of $277,000 on December 31, 1999."

  IN WITNESS WHEREOF, the parties hereto have caused these presents to be duly
executed as of the day and year first above written.

                                                LOEWS CORPORATION

                                                By:  /s/ James S. Tisch
                                                   ----------------------

Accepted and Agreed to:

/s/ Arthur L. Rebell
----------------------------
The Executive

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