384 EVOLUTION OF PHYSICAL CHAKACTERS 



a taller type has been favoured. ^ If this is so, if a taller type can 

 be selected by degrees in one environment, the shorter type may 

 equally well have been selected in another environment. 



So far, therefore, as the history of man outlined in the fifth 

 chapter is the history of the development of his bodily structure, 

 so far the explanation of history is to be sought in changes in the 

 germinal constitution, and the changes undergone are strictly 

 comparable with the changes among species in a state of nature, 

 though owing to the more varied environment outward differences 

 in the case of man may be rather more often due to environmental 

 influences than in the case of species closely related to man. 



Ridgeway, loc. cit., p. 18. 



