E:\REVISED  PROSP  SAIS  STICKERS\STICKERS\1999\10  04  99  CSIF  Treas,  indig
people.doc
                                 SUPPLEMENT TO:

                     CALVERT SOCIALLY RESPONSIBLE PROSPECTUS
                         CALVERT SOCIAL INVESTMENT FUND
                 DATED JANUARY 31, 1999, AS REVISED MAY 31, 1999

                                       AND

                    CLASS I (INSTITUTIONAL) SHARES PROSPECTUS
                         CALVERT SOCIAL INVESTMENT FUND
                DATED JANUARY 31, 1999, AS REVISED APRIL 1, 1999

                    DATE OF THIS SUPPLEMENT: OCTOBER 4, 1999


Calvert  Social Investment Fund has adopted a policy on the rights of indigenous
peoples  as  a  new  social  investment  criteria.



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