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This opposition is most concretely and comprehensively expressed in Haacke’s “Gestaltung und Vererbung.” The infinitely complex intricacy of Weismann’s minute microcosm within the germ-cell, indeed within every id in it, is justly described as a mere duplication, a repetition in the infinitely little of the essential difficulties to be explained.
A specially energetic fellow-worker on Eimer’s line is W. Haacke, a zoologist of Jena, author of “Gestaltung und Vererbung,” and “Die Schöpfung des Menschen und seiner Ideale.” In the first of these works Haacke combats, energetically and with much detail, Weismann’s “preformation theory,” and defends “epigenesis,” for which he endeavours to construct graphic diagrams, his aim being to make a foundation for the inheritance of acquired characters, definitely directed evolution, saltatory, symmetrical, and correlated variation.
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