One letter is to A. Carmichael, [no year] November 12, on light rays and electricty. There is a transcription and the original casing that the letter came in from the dealer with an engraving of Davy and a separate signature. The second is to "Dear Sir," 1816 March 10, and invites the recipient to a meeting of the Royal Institution. Purchased from R. King, May 1940.