228 



SOCIAL EVOLUTION 



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

 higher aptitude for achievement than a member of 

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



Pleistocene Precursor 



FiouEE 73. 



The Family Trop of the Hominidao. 

 to Giddings.l 



:) 



( According 



mental and physical superiority.^ Professor Boas does 

 not ])elieve that achievement is necessarily a measure 

 of aptitude for progress or of intellectual superiority. 



