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To this category belong Darwin’s gemmules, Haeckel’s plastidules, Nägeli’s micellæ, Weismann’s labyrinth of ids, determinants, and biophors within the germ-plasm, and Roux’s ingenious hypothesis of the struggle of parts, which is an attempt to apply the Darwinian principle within the organism in order here also to rebut the teleological interpretation by giving a scientific one. Heredity.
Weismann indeed attempts to solve this riddle through his germ-plasm theory, the predisposition of the future organism in the “ids,” determinants, and biophors, and through the variation of the determinants in germinal selection, amphimixis and so on.
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