SOCIAL EVOLUTION 



to develop it. It is argued that the Kuropcan has a 

 higher aptitude for achievement than a member of 

 another race, and that this higher aptitude is due to his 



Pleistocene Precursor 



FlOURB 73. The Family Treo of tin* Hmninidae. (According 

 to Giddings.) 



mental and physical superiority. Professor Boas does 

 not believe that achievement is necessarily a measure 

 of aptitude for progress or of intellectual superiority. 



