WEISMANN'S essay “On the Significance of Sexual Reproduction in the Theory of Natural Selection,” published in 1886, enunciates the thesis that the object of sexual reproduction is “to create those individual differences which form the material out of which natural selection produces new species.” This thesis was developed in the essay, “On the Number of Polar Bodies and Their Significance in Heredity” (1887), and still further in “Amphimixis,” published late in 1891.
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HARTOG, M. A Difficulty in Weismannism Resolved. Nature 48, 28–29 (1893). https://doi.org/10.1038/048028b0
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