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 CUSIP No. 14743R103                  13-G                   Page 7  of  9 Pages


                            EXHIBIT 1 TO SCHEDULE 13G
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                                FEBRUARY 13, 1998
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               MORGAN STANLEY, DEAN WITTER, DISCOVER & CO. and MILLER ANDERSON &

               SHERRERD,  LLP hereby  agree that,  unless  differentiated,  this

               Schedule 13G is filed on behalf of each of the parties.
            

            MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.

            BY: /s/ Bruce Bromberg
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            Bruce Bromberg / Vice President Morgan Stanley & Co., Incorporated

            MILLER ANDERSON & SHERRERD, LLP

            BY: /s/ Paul A. Frick
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            Paul A. Frick / Vice President Miller Anderson & Sherrerd LLP

* Attention. Intentional misstatements or omissions of fact constitute federal
  criminal violations (see 18 U.S.C. 1001).

