850292                       - 4 -
                        VOTING AGREEMENT


           This Voting Agreement dated as of January 10, 1998, is
entered    into    between   Mercantile    Bancorporation    Inc.
("Mercantile"),  and  the  undersigned director  and  shareholder
("Shareholder") of CBT Corporation ("CBT").

           WHEREAS, CBT, Mercantile and Ameribanc, Inc., a wholly
owned  subsidiary of Mercantile ("Ameribanc"), have  proposed  to
enter  into  an  Agreement and Plan of Merger (the  "Agreement"),
dated  as  of  today,  which  contemplates  the  acquisition   by
Mercantile of 100% of the capital stock of CBT (collectively, the
"CBT Stock") by means of a merger between CBT and Ameribanc; and

            WHEREAS,   Mercantile  is  willing  to   expend   the
substantial  time, effort and expense necessary to implement  the
Merger,  only  if Shareholder enters into this Voting  Agreement;
and

           WHEREAS,  the undersigned shareholder of CBT  believes
that the Merger is in his best interest and the best interest  of
CBT.

           NOW,  THEREFORE,  in consideration  of  the  premises,
Shareholder hereby agrees as follows:

               1.   Voting Agreement.  Shareholder shall vote all
of  the  shares of CBT Stock he now owns of record or has  voting
control  with respect to or hereafter acquires, in favor  of  the
Merger at the meeting of shareholders of CBT to be called for the
purpose of approving the Merger (the "Meeting").

                2.   No Competing Transaction.  Shareholder shall
not  vote  any of his shares of CBT Stock in favor of  any  other
merger  or sale of all or substantially all the assets of CBT  to
any  person  other  than Mercantile or its affiliates  until  the
Effective  Time  of the Merger, termination of the  Agreement  or
abandonment  of  the Merger by the mutual agreement  of  CBT  and
Mercantile, whichever comes first.

                3.   Transfers Subject to Agreement.  Shareholder
shall not transfer his shares of CBT Stock unless the transferee,
prior  to such transfer, executes a voting agreement with respect
to  the  transferred shares substantially to the effect  of  this
Voting Agreement and satisfactory to Mercantile.

                4.   No Ownership Interest.  Nothing contained in
this  Voting Agreement shall be deemed to vest in Mercantile  any
direct or indirect ownership or incidence of ownership of or with
respect  to  any shares of CBT Stock.  All rights, ownership  and
economic  benefits  of and relating to the shares  of  CBT  Stock
shall remain and belong to Shareholder and Mercantile shall  have
no  authority to manage, direct, superintend, restrict, regulate,
govern or administer any of the policies or operations of CBT  or
exercise  any  power  or authority to direct Shareholder  in  the
voting  of  any of his shares of CBT Stock, except  as  otherwise
expressly  provided herein, or the performance of his  duties  or
responsibilities as a director of CBT.

                5.    Evaluation of Investment.  Shareholder,  by
reason  of his knowledge and experience in financial and business
matters  and  in  his  capacity as  a  director  of  a  financial
institution,  believes himself capable of evaluating  the  merits
and  risks  of  the  potential  investment  in  common  stock  of
Mercantile,   $0.01  par  value  ("Mercantile   Common   Stock"),
contemplated by the Agreement.

                  6.      Documents    Delivered.     Shareholder
acknowledges  having reviewed the Agreement and  its  attachments
and  that  reports, proxy statements and other  information  with
respect  to  Mercantile  filed with the Securities  and  Exchange
Commission  (the  "Commission") were, prior to his  execution  of
this  Voting Agreement, available for inspection and  copying  at
the  Offices of the Commission and that Mercantile delivered  the
following such documents to CBT:

                                (a)    Mercantile's   Annual
                         Report  on Form 10-K for  the  year
                         ended December 31, 1996, as amended
                         by Form 10-K/A;
                         
                               (b)   Mercantile's  Quarterly
                         Reports   on  Form  10-Q  for   the
                         quarters  ended  March  31,   1997,
                         June  30,  1997  and September  30,
                         1997; and
                         
                                (c)    Mercantile's  Current
                         Reports on Form 8-K dated April 25,
                         1997,  May 13, 1997, July 1,  1997,
                         two  dated September 25,  1997  and
                         Current Report on Form 8-K/A  dated
                         May 22, 1997.
                         
                7.    Amendment  and Modification.   This  Voting
Agreement may be amended, modified or supplemented at any time by
the   written   approval  of  such  amendment,  modification   or
supplement by Shareholder and Mercantile.

                8.    Entire  Agreement.  This  Voting  Agreement
evidences  the  entire agreement among the  parties  hereto  with
respect  to  the  matters provided for herein and  there  are  no
agreements,  representations or warranties with  respect  to  the
matters provided for herein other than those set forth herein and
in the Agreement.

                9.   Severability.  The parties agree that if any
provision  of this Voting Agreement shall under any circumstances
be  deemed invalid or inoperative, this Voting Agreement shall be
construed with the invalid or inoperative provisions deleted  and
the  rights and obligations of the parties shall be construed and
enforced accordingly.

                10.  Counterparts.  This Voting Agreement may  be
executed  in two counterparts, each of which shall be  deemed  an
original, but all of which together shall constitute one and  the
same instrument.

                11.   Governing Law.  The validity, construction,
enforcement and effect of this Voting Agreement shall be governed
by  the internal laws of the State of Missouri, without regard to
its conflict of laws principles.

               12.  Headings.  The headings for the paragraphs of
this Voting Agreement are inserted for convenience only and shall
not   constitute  a  part  hereof  or  affect  the   meaning   or
interpretation of this Voting Agreement.

                13.   Termination.  This Voting  Agreement  shall
terminate upon the consummation of the Merger or upon termination
of the Agreement, whichever comes first.

                14.  Successors.  This Voting Agreement shall  be
binding  upon  and  inure to the benefit of  Mercantile  and  its
successors,  and Shareholder and Shareholder's spouse  and  their
respective  executors, personal representatives,  administrators,
heirs, legatees, guardians and other legal representatives.  This
Voting  Agreement  shall  survive  the  death  or  incapacity  of
Shareholder.   This Agreement may be assigned by Mercantile  only
to an affiliate of Mercantile.

                                
                                
                                MERCANTILE BANCORPORATION INC.
                                
                                
                                
                                By:
                                   John  W. Rowe, Executive  
                                   Vice President
                                   Mercantile   Bank National Association
                                   Authorized Officer
                                
                                
                                
                                SHAREHOLDER