The American Naturalist 



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



L Distribution and Species-forming of Ecto-para- 

 ■ites. Professor Vernon Lyman Kellogg. 



13L Simplification of Mendelian Formulas. Profes- 

 ln Vertebrate Paleontology, Professor Boy 



AlpheusHyatt and his Principles of Research. Dr. 

 Notts ^^^ er ^^aoi^^^B^\^7^Uw^i 



Inheritanoe^of Mammae in Duroc Jersey 8wine. Pro- 

 Animal kingdom. ^Profa^w H.°S. Jeualngs! 



CONTENTS OF THE JUNE NUMBER 



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

 Goodale and Professor T. H. Morgan. 



IV. shcSex 1 Arttelei d »nd ^UCTSsion 



V No^^d^terature : Valuation of the Sea. 

 Professor Chas. C. Adams. 



CONTENTS OF THE JULY NUMBER 



Doctrines held as Vitalism. Professor H. & Jennings. 

 The Presence of the Barred Plumage Pattern in the 

 White Leghorn Breed of Fowls. Dr. Philip B. 



Shorter Articles and Discussion: The Geologic Work 



Notes and Literature : Work in Genetic Problems in 



Jordan" 1 IcMh7 ° logy - Pre * ident sta,T 



CONTENTS OF THE AUGUST NUMBER^ 



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