This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...all the time in which they are being distributed, by cell division, to their respective proper fields of action. Weismann insists, and probably with reason, on the necessity of such a theory to a theory of adaptation by transformation. He says: --"The germ-plasm is an extremely delicately formed organic structure--a ...

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