The American Naturalist 



A Monthly Journal. e.tabli»hed in 1867. Devoted to^the Advancement of the^ Biological Science. 



OONTENTB OF THE MARCH NUMBER 



The^ Genotype^ Hypothesis and Hybridization. Pio- 



OONTENT8 OF THE APRIL NUMBER 



OONTENT8 OF THE MAY NUMBER 



The Inheritance of Polymorphism and Sex in Coliaa 

 Philodice. Professor John H. Geeoulx*. 



Shorter ^jicles J^^ t ^ c " * 10 ° he J E^|§^b Ct gp l J n ^. 



CONTENTS OF JUNE NUMBER 



Inheritance of Fecundity in the Domestic Fowl. Dr 



^be^Svetopment of Two Species of Moss. Pro- 

 SlioSrS?- m^W^X^The Ontogeny of . 

 Notes and Literature: Kecent Contributions to a 

 Knowledge of the Extinct Amphibia. Dr. 



Germ-cell Determinants and Their Significance. Pro- 



CONTE ' ' NUM " f ^ e , ania 



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