SELECTION ON MAN. 327 



surviving, and thus lead to the development of a new 

 species, genus, or higher group of man. On the other 

 hand, we know that far greater changes of conditions 

 and of his entire environment have been undergone by 

 man, than any other highly organized animal could 

 survive unchanged, and have been]'met by mental, not 

 corporeal adaptation. The difference of habits, of food, 

 clothing, weapons, and enemies, between savage and 

 civilized man, is enormous. Difference in bodily form 

 and structure there is practically none, except a slightly 

 increased size of brain, corresponding to his higher 

 mental development. 



We have every reason to believe, then, that man 

 may have existed and may continue to exist, through 

 a series of geological periods which shall see all other 

 forms of animal life again and again changed ; while he 

 himself remains unchanged, except in the two parti- 

 culars already specified the head and face, as imme- 

 diately connected with the organ of the mind and as 

 being the medium of expressing the most refined emo- 

 tions of his nature, and to a slight extent in colour, 

 hair, and proportions, so far as they are correlated with 

 constitutional resistance to disease. 



Summary. 



Briefly to recapitulate the argument ; in two dis- 

 tinct ways has man escaped the influence of those 

 laws which have produced unceasing change in the 

 animal world. 1. By his superior intellect he is ena- 

 bled to provide himself with clothing and weapons, and 



