Abstract
I THINK it may be reasonably objected to Mr. Cunningham's ingenious reductio ad absurdum of Weismann's theory, that because we cannot exactly state what happens in the mysterious fusion of sperm and germ-nucleus, it by no means follows that such fusion does not largely account for the observed variation. I say largely, because Prof. Weismann's more recent paper, “Ueber die Zahl der Richtungskörper und über ihre Bedeutung für die Vererbung” (Jena, 1887), completes in a most important manner the paper quoted and criticized by Mr. Cunningham.
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