152 MR. DARWIN'S CRITICS v 



had been developed from some other animal as it 

 is now, when we know that for every bone, muscle, 

 tooth, and even pattern of tooth, in man, there is a 

 corresponding bone, muscle, tooth, and pattern of 

 tooth, in an ape. And this shows one of two things 

 either that the Quarterly Reviewer's notions of 

 probability are peculiar to himself, or that lie has 

 such an overpowering faith in the truth of evolution 

 that no extent of structural break between one 

 animal and another is sufficient to destroy his con- 

 viction that evolution has taken place. 

 i But this by the way. The importance of the 

 admission that there is nothing in man's physical 

 structure to interfere with his having been evolved 

 from an ape is not lessened because it is grudg- 

 ingly made and inconsistently qualified. And in- 

 stead of jubilating over the extent of the enemy's 

 retreat, it will be more worth while to lay siege to 

 his last stronghold the position that there is a 

 distinction in kind between the mental faculties 

 of man and those of brutes, and that in consequence 

 of this distinction in kind no gradual progress 

 from the mental faculties of the one to those of the 

 other can have taken place. 



The Quarterly Reviewer entrenches himself 

 within formidable-looking psychological outworks, 

 and there is no getting at him without attacking 

 them one by one. 



He begins by laying down the following pro- 

 position. " ' Sensation ' is not ' thought/ and no 



