128 CHARLES DARWIN. 



pendious statements of well-sifted facts bearing on the 

 doctrine of species that has ever appeared." 



It is clear that two very distinct points are urged 

 in this criticism of natural selection — (1) the difficulty 

 that selective methods applied by man have not as 

 yet produced all the characteristics of true species; 

 (2) supposing the latter difficulty to be surmounted 

 or sufficiently explained, the uncertainty as to how 

 much or how little of the process of evolution has 

 been due to natural selection. 



Later in the same year Darwin seems to have 

 been a little disappointed that Huxley's confidence 

 did not increase. Thus, he wrote on December 2nd, 

 1860 :— 



"I entirely agree with you that the difficulties on my 

 notions are terrific ; yet having seen what all the Reviews have 

 said against me, I have far more confidence in the general 

 truth of the doctrine than I formerly had. Another thing 

 gives me confidence— viz. that some who went half an inch 

 with me now go further, and some who were bitterly opposed 

 are now less bitterly opposed. And this makes rae feel a little 

 disappointed that you are not inclined to think the general 

 view in some slight degree more probable than you did at 

 first. This I consider rather ominous. Otherwise I should be 

 more contented with your degree of belief. I can pretty 

 plainly see that if my view is ever to be generally adopted, it 

 will be by young men growing up and replacing the old 

 workers, and then young ones finding that they can group 

 facts and search out new lines of investigation better on the 

 notion of descent than on that of creation." 



In 1863 Huxley delivei-ed a course of lectures 

 to working men on " The Causes of the Phenomena 



