34 Darwin, and after Darwin. 



Quitting then the last, and in my opinion the 

 weakest chapter of Darwinism, the most important 

 points presented by other portions of this work are 

 to quote its author's own enumeration of them an 

 attempted "proof that all specific characters are (or 

 once have been) either useful in themselves or corre- 

 lated with useful characters": an attempted "proof 

 that natural selection can, in certain cases, increase 

 the sterility of crosses ": an attempted ' ; proof that 

 the effects of use and disuse, even if inherited, must be 

 overpowered by natural selection": an attempted 

 proof that the facts of variation in nature are in them- 

 selves sufficient to meet the difficulty which arises 

 against the theory of natural selection, as held by him, 

 from the swamping effects of free inter-crossing : and, 

 lastly, "a fuller discussion on the colour relations of 

 animals, with additional facts and arguments on the 

 origin of sexual differences of colour." As I intend to 

 deal with all these points hereafter, excepting the last, 

 it will be sufficient in this opening chapter to remark, 

 that in as far as I disagree with Mr. Wallace (and 

 agree with Darwin), on the subject of "sexual 

 differences of colour," my reasons for doing so have 

 been already sufficiently stated in Part I. But there 

 is much else in his treatment of this subject which 

 appears to me highly valuable, and therefore present- 

 ing an admirable contribution to the literature of 

 Darwinism. In particular, it appears to me that the 

 most important of his views in this connexion 



admirable discussion on this subject, which has been published since the 

 above was written. The same has to be said of Weismann's Essay on 

 Music, where much that I have here said is anticipated. With the views 

 and arguments which Mr. Mivart has forcibly set forth I have already 

 dealt to the best of my ability in a work on Menial Evolution in Man, 



