Miscellaneous material consisting of four items relating to the Supplement to the 1985 Calendar of the Correspondence of Charles Darwin (1821-1882). A typescript letter dated 7th July 1994 written by Jack Johns to Anne S. Burkhardt confirming that he would be pleased to receive a supplement to the 1985 Calendar. Partial draft of letter on verso. A holograph letter dated 5th July 1994 written by Anne S. Burkhardt to Jack Johns, enquiring whether he would be interested in receiving a supplement to the 1985 Calendar, free of charge. A typescript letter dated 4th September 1985 written by Jack Johns to F. H. Burkhardt requesting that any supplements to the 1985 Calendar should be sent to him. A Calendar of the Correspondence of Charles Darwin, 1821-1882, Supplement to the Correspondence (Cambridge, 1994) by Professor F. Burkhardt. 46 p. (Original Calendar from Mr Johns' collection is item no. F219649)