Exhibit 4.a

                    AGREEMENT OF APPOINTMENT
                               AND
                 ACCEPTANCE OF SUCCESSOR TRUSTEE


     THIS AGREEMENT dated as of July 25, 1994 (the "Agreement"), is among
Masco Corporation (the "Company"), Morgan Guaranty Trust Company of New
York ("Morgan") and The First National Bank of Chicago ("First Chicago").

     WHEREAS, Section 6.10 of the Indenture dated as of December 1, 1982
between the Company and Morgan (the "Indenture") provides that the Trustee
thereunder may resign at any time by giving written notice of such
resignation to the Company;

     WHEREAS, Morgan gave such written notice, dated July 11, 1994, to the
Company;

     WHEREAS, Section 6.10 of the Indenture provides that in case the
Trustee shall resign, the Company shall promptly appoint a successor
Trustee thereunder;

     WHEREAS, the Company's Board of Directors authorized the appointment
of First Chicago as successor Trustee under the Indenture; and

     WHEREAS, Section 6.11 of the Indenture provides that any successor
Trustee appointed thereunder shall execute, acknowledge and deliver to the
Company and the resigning Trustee thereunder an instrument accepting such
appointment, and thereupon the resignation of such resigning Trustee shall
become effective and such successor Trustee, without any further act, deed
or conveyance, shall become vested with all the rights, powers, trusts,
immunities, duties and obligations of the resigning Trustee thereunder,
with like effect as if originally named as Trustee therein.

     NOW THEREFORE, KNOW ALL MEN BY THESE PRESENTS, that for and in
consideration of the premises and of other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the Company,
Morgan and First Chicago hereby covenant and agree as follows:

     1.   The Company hereby accepts the resignation of Morgan as Trustee
under the Indenture, such resignation to become effective at the close of
business on the date hereof.  From the close of business on the date hereof
and except as otherwise provided for herein, Morgan shall have no further
responsibility for the exercise of the rights and powers or for the 
performance of the trusts and duties vested in the Trustee under the
Indenture.

     2.   Pursuant to Section 6.10 of the Indenture, and in accordance
with the resolutions duly adopted by the Company's Board of Directors, the
Company hereby confirms its appointment of First Chicago as successor
Trustee under the Indenture, effective as of
PAGE

the close of business on the date hereof, and hereby vests in First Chicago
all the rights, powers, trusts, immunities, duties and obligations which
Morgan now holds under and by virtue of the Indenture with like effect as
if originally named as Trustee in  the Indenture.

     3.   First Chicago hereby represents that it is qualified and
eligible under Article Six of the Indenture and under the Trust Indenture
Act of 1939, as amended, to accept appointment as successor Trustee under
the Indenture.

     4.   First Chicago hereby accepts, as of the close of business on
the date hereof, its appointment as successor Trustee under the Indenture
and assumes the rights, powers, trusts, immunities, duties and obligations
which Morgan now holds under and by virtue of  the Indenture, upon the
terms and conditions set forth therein.

     5.   In accordance with Section 6.11 of the Indenture, Morgan hereby
confirms, assigns, transfers and sets over to First Chicago, as successor
Trustee under the Indenture, all rights, powers, trusts, immunities, duties
and obligations which Morgan now holds under and by virtue of the
Indenture, and does hereby assign, transfer and deliver to First Chicago, as
such Trustee, all property and money held by Morgan as Trustee under the
Indenture.

     6.   In accordance with Section 6.11 of the Indenture, the Company
and Morgan, for the purpose of more fully and certainly vesting in and
confirming to First Chicago, as successor Trustee under the Indenture, the
rights, powers, trusts, immunities, duties and obligations of such Trustee
with like effect as if originally named as Trustee in the Indenture, agree
upon reasonable request of First Chicago to execute, acknowledge and
deliver such further instruments of conveyance and further assurance and to
do such other things as may be reasonably required for more fully and
certainly vesting and confirming in First Chicago all rights, powers,
trusts, immunities, duties and obligations which Morgan now holds under and
by virtue of the Indenture.

     7.   Promptly after the execution hereof, Morgan shall mail the
notice of the resignation of Morgan and the succession of First Chicago as
successor Trustee in accordance with Sections 6.10 and 6.11 of the
Indenture.  Such notice shall be in the form attached hereto as Exhibit A.

                               -2-
PAGE

     8.   This Agreement may be executed in any number of counterparts
all of which taken together shall constitute one and the same Agreement,
and any of the parties hereto may execute this Agreement by signing any
such counterpart.

     9.   This Agreement shall be governed by the laws of the State of
New York, both in interpretation and performance.

     10.  Unless otherwise defined, all terms used herein with initial
capital letters shall have the meaning given them in the Indenture.

     11.  Morgan hereby represents and warrants to First Chicago that:
(a) no covenant or condition contained in the Indenture has been waived by
Morgan or, to the best of the knowledge of the officers assigned to
Morgan's Corporate Trust Department, by the Holders of the percentage in
aggregate principal amount of the Securities required by the Indenture to
effect any such waiver; (b) there is no action, suit or proceeding pending
or, to the best of the knowledge of the officers assigned to Morgan's
Corporate Trust Department, threatened against Morgan before any court or
any governmental authority arising out of any action or omission by Morgan
as Trustee under the Indenture; (c) to the best of the knowledge of the
officers assigned to Morgan's Corporate Trust Department, no Event of
Default, or event which, with the giving of notice or passage of time or
both, would become an Event of Default, has occurred and is continuing; and
(d) Morgan has furnished, or as promptly as practicable will furnish, to
First Chicago originals of all documents relating to the trust created by
the Indenture and all material information in its possession relating to
the administration and status thereof and will furnish to First Chicago any
of such documents or information First Chicago may reasonably request,
provided that First Chicago will make available to Morgan as promptly as
practicable following the request of Morgan any such original documents
which Morgan may need to defend against any action, suit or proceeding
against Morgan as Trustee or which Morgan may need for any other proper
purpose.

     12.  The Company hereby represents and warrants to First Chicago and
Morgan that no Event of Default, or event which, with the giving of notice
or passage of time or both, would become an Event of Default, has occurred
and is continuing.

     13.  Except as hereinabove expressly set forth, all other terms and
provisions set forth in the Indenture shall remain in full force and effect
and without any change whatsoever being made hereby.

                               -3-
PAGE

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed and acknowledged as of the date first written above.
                                   MASCO CORPORATION

                                   By:/s/ Gerald Bright      
                                   Name:  Gerald Bright
                                   Title: Vice President

[Seal]
Attest:


/s/ Eugene A. Gargaro, Jr.
Secretary
                                   MORGAN GUARANTY TRUST COMPANY 
                                     OF NEW YORK, as resigning   
                      Trustee


                                   By:/s/David K. Leverich   
                                   Name:  David K. Leverich
                                   Title: Vice President

[Seal]
Attest:


/s/ M. E. McNulty         
Assistant Secretary

                                   THE FIRST NATIONAL BANK OF
                                     CHICAGO, as successor Trustee


                                   By:/s/ R. D. Manella      
                                   Name:  R. D. Manella         
                                   Title: Vice President

[Seal]
Attest:


/s/ Jamie Arlow           
Trust Officer

                               -4-
PAGE

State of Michigan)
                 ) ss
County  of  Wayne)

     On the 22nd day of July, 1994, before me personally came Gerald
Bright, to me known, who, being by me duly sworn, did depose and say that
he is a Vice President of Masco Corporation, the corporation described in
and which executed the above instrument; that he knows the corporate seal
of said corporation; that the seal affixed to the said instrument is such
corporate seal; that it was so affixed by authority of the Board of
Directors of said corporation; and that he signed his name thereto by like
authority.


                                   /s/ Nancy S. Steinrock    
                                   Nancy S. Steinrock
                                   Notary Public
                                   Wayne County, Michigan
                                   My Comm Exp.: Nov. 9, 1994


[NOTARIAL SEAL]


State of New York )
                  ) ss
County of New York)

     On the 22nd day of July, 1994, before me personally came David K. 
Leverich, to me known, who, being by me duly sworn, did depose and say that
he is a Vice President of Morgan Guaranty Trust Company of New York, the
corporation described in and which executed the above instrument; that he
knows the corporate seal of said corporation; that the seal affixed to the
said instrument is such corporate seal; that it was so affixed by authority
of the Board of Directors of said corporation; and that he signed his name
thereto by like authority.


                                   /s/ Thomas J. Courtney    
                                   Thomas J. Courtney
                                   Notary Public
                                   State of New York
                                   No. 24-4996233
                                   Qualified in Kings County
                                   My Comm Exp.: May 11, 1996


[NOTARIAL SEAL]

                               -5-
PAGE

State of Illinois)
                 ) ss
County  of  Cook )

     On the 22nd day of July, 1994, before me personally came R. D.
Manella, to me known, who, being by me duly sworn, did depose and say that
he is a Vice President of The First National Bank of Chicago, the 
corporation described in and which executed the above instrument; that he
knows the corporate seal of said corporation; that the seal affixed to the
said instrument is such corporate seal; that it was so affixed by authority
of the Board of Directors of said corporation; and that he signed his name
thereto by like authority.


                                   /s/ C. J. Bertelson       
                                   C. J. Bertelson
                                   Notary Public
                                   State of Illinois
                                   My Comm Exp.: Sept. 1, 1997


[NOTARIAL SEAL]

                               -6-
PAGE

                                                       Exhibit A
                NOTICE OF RESIGNATION OF TRUSTEE
                               AND
                APPOINTMENT OF SUCCESSOR TRUSTEE


To the Holders of the following Securities of Masco Corporation:


                    9% Notes Due April 15, 1996                  

     
                    9% Notes Due October 1, 2001
                  
                    6-1/4% Notes Due June 15, 1995                   

                    6-5/8% Notes Due September 15, 1999              

                    7-1/8% Debentures Due August 15, 2013            

                    6-1/8% Notes Due September 15, 2003              


     NOTICE IS HEREBY GIVEN THAT, pursuant to Sections 6.10 and 6.11 of
the Indenture (the "Indenture") dated as of December 1, 1982 between Masco
Corporation (the "Company") and Morgan Guaranty Trust Company of New York
("Morgan Guaranty"), under which the above-referenced Securities were
issued:

1.   Morgan Guaranty has resigned as Trustee under the Indenture. 

2.   The Company has appointed The First National Bank of Chicago ("First
     Chicago") as successor Trustee under the Indenture, and First Chicago
     has accepted such appointment.  

3.   The following is the office or agency of the Company where securities
     issued under the Indenture may be presented for payment, or presented
     for registration of transfer or for exchange as provided in the
     Indenture and where notices and demands to or upon the Company in
     respect of any of the Securities issued under the Indenture or the
     Indenture may be served: 

                    The First National Bank of Chicago 
                    c/o First Chicago Trust Company of New York 
                    14 Wall Street, 8th Floor 
                    New York, New York 10005
                    Attention:  Corporate Trust Administration



Dated: July 25, 1994               

MASCO CORPORATION                       MORGAN GUARANTY TRUST COMPANY 
                                        OF NEW YORK