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THE AMERICAN NATURALIST [Vol. LII 



19176. Mendelian Factor Differences versus Reaction System Con- 

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1916. Studies in the Hybrid Bistoninse. Jour. Genetics, 6, pp. 95-161. 



1905. The Origin of Species through Isolation. Sci., N. S., 22, pp. 



1916. Evolution by Means of Hybridization. The Hague, 

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1914. Chromosome Studies in the Diptera, I. A Preliminary Sur 

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1915. The Mechanism of Mendelian Heredity. New York. 

 Morgan, T. H. 



1916. A Critique of the Theory of Evolution. Princeton. 

 Muller, H. J. 



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