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. H. Ethnology. 



EIPLEY, W. Z. The Races of Europe. 



SERGI, G. Tlie Mediterranean Race. 



TYLOR, E. B. Anthropology. 



