P.S.--Is not Harvey in the class of men who do not at all care for generalities? I remember your saying you could not get him to write on Distribution. I have found his works very unfruitful in every respect. [Here follows the memorandum referred to:] Geologists. Zoologists and Physiologists. Botanists. Palaeontologists. Lyell. Huxley. Carpenter. Hooker. Ramsay.* J. Lubbock. Sir H. Holland H.C. Watson. (to large extent). Jukes.* L. Jenyns Asa Gray (to large extent). (to some extent). H.D. Rogers. Searles Wood.* Dr. Boott (to large extent). Thwaites. (*Andrew Ramsay, late Director-General of the Geological Survey. Joseph Beete Jukes, M.A., F.R.S., 1811-1869. He was educated at Cambridge, and from 1842 to 1846 he acted as naturalist to H.M.S. "Fly", on an exploring expedition in Australia and New Guinea. He was afterwards appointed Director of the Geological Survey of Ireland. He was the author of many papers, and of more than one good hand-book of geology. Searles Valentine Wood, February 14, 1798-1880. Chiefly known for his work on the Mollusca of the 'Crag.') [The following letter is of interest in connection with the mention of Mr. Bentham in the last letter:] G. BENTHAM TO FRANCIS DARWIN. 25 Wilton Place, S.W., May 30th, 1882. My dear Sir,