VOL. I, NO. 996 



AUGUST, 1916 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOTJBNAL 

 Devoted to the Advancement of the Biological Sciencei wi 

 Special Beference to the Factors of Evolution 



CONTENTS 



The Form of Evolutionary Theory that Modern Genetlcal Research see 

 f*vor. Dr. Chas. B. Davenport 



Comparative Rapidity of Evolution in Various Plant Types. Pro 

 Edmund W. Sinnott 



Egg Production and Selection. Dr. H. D. Goodale - 



Shorter Articles and Discussion: On Selective Partial Sterility as an Ex] 

 tion of the Double-throwing Stock and the Petunia: Edith R. Saun 

 Gametogenesis in Plants: Professor L. B. Walton 



Notes and Literature: Life Histories in the Red Algae: Professor BR^ 



THE SCIENCE PBESS 

 LANCASTER, PA. GAEBISON, N. Y. 



NEW YORK: SUB-STATION 84 



