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 superwr intellect he is ena- 
bled to provide himself with clothing and weapons, and 
