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THE 

 TREND OF THE RACE 



A STUDY OF PRESENT TENDENCIES IN 



THE BIOLOGICAL DEVELOPMENT 



OF CIVILIZED MANKIND 



BY 

 SAMUEL J. HOLMES, Ph. D. 



PROFESSOR OF ZOGlOGY IN THE UNIVERSITY OF CALIFORNIA 



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V 



NEW YORK 



HARCOURT, BRACE AND COMPANY 



1921 



