230 



OBIG1N OF SPECIES. 



[Ch. XIII. 



knowing that any one had really thus objected to the law of 

 gravity. Newton answers by saying that it is philosophy to 

 make out the movements of a clock, though you do not know 

 why the weight descends to the ground. Leibnitz further 

 objected that the law of gravity was opposed to Natural 

 Eeligionl Is this not curious? I really think I shall use 

 the facts for some introductory remarks for my bigger book." 



\0. D. to J. D. Booker, Down, March 3rd [I860]. 



... I think you expect too much in regard to change oi 

 opinion on the subject of Species. One large class of men, 

 more especially I suspect of naturalists, never will care about 

 any general question, of which old Gray, of the British Museum, 

 may be taken as a type ; and secondly, nearly all men past a 

 moderate age, either in actual years or in mind are, I am fully 

 convinced, incapable of looking at facts under a new point of 

 view. Seriously, I am astonished and rejoiced at the progress 

 which the subject has made ; look at the enclosed memorandum. 



says my book will be forgotten in ten years, perhaps so ; 



but, with such a list, I feel convinced the subject will not. 

 [Here follows the memorandum referred to : ] 



* Andrew Ramsay, late Director-General of the Geological Survey. 



t Joseph Beete Jukes, M.A., F.R.S., born 1811, died 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. 

 Ho was afterwards appointed Director of the Geological Survey of 

 Ireland. He was the author of many papers, and of more than one good 

 handbook of geology. 



X Professor of Geology in the University of Glasgow. Born in the 

 United States 1809, died 1866. 



§ Searles Valentine Wood, died 1880. Chiefly known for his work on 

 the Mollusca of the Crag. 



|| Dr. G. H. K. Thwaites, F.R.S., was born in 1811, or about that date, 

 and died in Ceylon, September 11, 1882. He began life as a Notary, but 

 his passion for Botany and Entomology ultimately led to Lis taking to 



