Unpublished letter, regarding a paper on the development of functions from John Walsh to Davies Gilbert Covering letter for the paper found at AP/10/16 on the development of functions. Walsh writes that he had received a letter from Gilbert regarding his previous note on the development of functions (AP/10/14), and that the Royal Society would like to read a more complete version of this memoir. Subject: Mathematics Written by Walsh in Leitrim Street, Cork [Ireland] and addressed to Gilbert at 45 Bridge Street East Bourn, Westminster [London]. East Bourn is struck out in Gilbert's address. 23 January 1830