THE THEORIES OF 

 EVOLUTION 



BY 



YVES DELAGE, M.D., ScD. 



Professor of Comparative Zoology, Anatomy and Physiology 

 at the University of Paris, Member of the Institute 



AND 



MARIE GOLDSMITH, M.Sc. 



Editor of l'Annee Biologique 



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ATED BY ANDRE* TRIDON, M.A. 



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NEW YORK 



*B. W. HUEBSCH 



1913 



