The American Naturalist 



A Monthly Journal, established in 1867. Devoted to the Advancement of the Biological Sciences 

 with Special Reference to the Factors of Organic Evolution and Heredity 



L Farton^and ^ t f ^ a ^ c ^ r, M in rg 3 ^ endelian 



«on^? I8^fat£n gl w Coincidence? ^Ellis U 

 III. A Family of Spotty Negroes. Q. I. Simpson 



CONTENTS OF THE FEBRUARY NUMBER 



genesis. ProiessorMaynard M. Metcalf. 

 Adaptation in the LMng^and ^ Non-living. Pre- 

 Adaptations in Animal Reactions. Professor G. H. 

 Adaptation from the JPoint of View of the Phyil- 



Th6 Ip>|^^ 



L Distribution and Species-forming of Ecto-para- 



■ites. Professor Vernon Lyman Kellogg. 

 IL Castration in Eelation to the Secondary Sexual 



in Vertebrate Paleontology. Professor Roy 



Alpheus Hyatt and his Principles of Ratearch. Dr. 

 Robert Tracy Jackson. 



Shorter Articles and BiKX ^ sio f^^ r ^J^ 



Hto£fayan e^iflomor^to°^£ 

 Fiih^emai^ T. D.A*. 



Notes ^^^^^^^^^^jg^ji^ooOit. 



lnimil G kin»^om. Professor H. S. JennK 



CONTENTS OF THE JUNE NUMBER 



III. Clo^al*VMiS^ J ^ nvi(> *' 



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