The American Naturalist 



A Monthly Journal. ««tablbhed in 1867. Devoted to the Advancement of the Biological Science* 

 with Special Reference to the Factors of Organic Evolution and Heredity 







A Contribution to tbe Theory of Orthogennii Dr. 



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CONTENT8 OF THE NOVEMBER NUMBER 



The ^American ^Toad (Bufo lentiginoses americanns 







Open^ofCon,. 



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