Autograph Letter Signed, to Sir Henry Thompson, explaining that he is unable to keep the engagement due to council and committee meetings. 3 pp. 7 x 4 inches, second leaf mounted at corners to part of an old album page, a few light stains, otherwise good. Grove Lodge, Cambridge, 10 March 1878. Sir George Murray Humphry, FRS (1820 – 1896), professor of physiology and anatomy at Cambridge, surgeon, gerontologist and medical writer.