232 SOCIAL EVOLUTION 



reference as it has been advanced since "The Principles" 

 was published, and is taken with Professor Giddings' per- 

 mission from notes of his lectures at Columbia University. ) 



KEANE, A. II. Ethnology. 



Kii-LEY, W. Z.The Races of Europe. 



SEROI, G. The Mediterranean Race. 



TYLOR, E. B. Anthropology. 



