Books Science Nature Studies In The Theory Of Descent, Vol. 2 Of 2 (Classic Reprint)

Studies In The Theory Of Descent, Vol. 2 Of 2 (Classic Reprint).pdf

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Read online or download a free book: Studies In The Theory Of Descent, Vol. 2 Of 2 (Classic Reprint)

Pages: 370

Language: English

Publisher: Forgotten Books (14 Jun. 2016)

By: August Weismann (Author)

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Excerpt from Studies in the Theory of Descent, Vol. 2 of 2

It would be meaningless to assert that the two stages above mentioned were completely independent of one another. It is obvious that the amount of organic and living matter contained in the caterpillar determines the size of the butterfly, and that the quantity of organic matter in the egg must determine the size of the emergent larva. The assertion in the above heading refers only to the structure: but even for this it cannot be taken as signifying an absolute, but only a relative independence, which, however, certainly obtains in a very high degree. Although it is conceivable that every change of structure in the imago may entail a correlative change of structure in the larva, no such cases have as yet been proved: on the contrary, all facts indicate an almost complete independence of the two stages. It is quite different with cases of indirect dependence, such, for example, as are brought about by 'nurse-breeding.'

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