256 BIBLIOGRAPHY 



* VERNON, H. M. " Variation in Animals and Plants. " 1903. 

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**VniES, H. DE. "Species and Varieties, their Origin by 

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** "The Mutation Theory." Translation. 2 vols., 1910 



and 1911. [A detailed account of the author's remark- 

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WALKER, C. E. "Hereditary Characters and their Modes of 

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WALLACE, ALFRED RUSSEL. "Darwinism." 1889. [A 

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*** "Contributions to the Theory of Natural Selection." 



1871. 



*WEISMANN, ATTQTTST. "The Evolution Theory." 2 vols., 

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** "The Germ-plasm." Contemporary Science Series. 



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** "Essays on Heredity and Kindred Subjects." 1891-92. 



WILSON, E. B. "The Cell in Development and in Inherit- 

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