The American Naturalist 



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

 with Special Reference to the Factors of Organic Evolution and Heredity 



CONTENTS OF THE FEBRUARY NUMBER 



fis- r fur'- n i ,!h a ( I. \ ' .-'»'.>' 

 Adaptations in Animal Reactions. Professor G. H. 



L Distribution and Species-forming o^Ecto-pam- 



*)haracters of Brown Leghorns. H. D. 



III. Simplification of Mendelian Formulae. Profes- 



IV. Notes and Literature: Some Recent^Advances 



CONTENTS OF THE APRIL NUMBER 



Alpheus Hyatt and his Principles of Research. Dr. 

 Bearing of^era^ogical Development in^icotian* 



CONTENTS OF THE MAY NUMBER 



Inheritance of Mamra in Duroc Jersey Swine, Pro- 

 Natural and Artificial Parthenogenesis in the Genus 

 Nicotians. Richard Wellington. ^ ^ 



CONTENTS OP THE JUNE NUMBER 



1. Heredity of Tricolor in Guinea-pigs. Dr. H. D. 



III. Clonal Variation in Pecttnatella^^Annie P. 



CONTENTS OF THE JUNE NUMBER 



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