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Improvement Era, Vol. 18 - February, 1915 (Classic Reprint) (Cód: 10043960)

AUTHOR,UNKNOWN; Unknown,Author

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Improvement Era, Vol. 18 - February, 1915 (Classic Reprint)

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Descrição

Excerpt from Improvement Era, Vol. 18: February, 1915 But it is equally evident that the subsequent analogies between the embryonic structure and those Of lower animals have little or no recapitulatory significance. This may be argued from the fact, not generally understood, that, in a very real sense, the developing young of any animal is a separate individual being from the very beginning of its history; functioning with its own organs, according to the needs Of its environment at any given stage, and producing only such organs as structurally and func tionally are demanded at any such stages. Even in the mammals the connection between the circulation Of the mother and the embryo is not direct, but the necessary nourishment and aeration are communicated by a process known as dialysis, consisting of a certain percolation through the tissues covered by the placenta. Indeed, the moment that we recognize the Obvious fact that the whole process of maturing the embryo Is one of cell division and cell-distribution, so soon will we understand that it must, from the mere necessity Of the case, proceed from a simple form Of organi zation to one more complex, which is to say more varied or elab orated, the broad general outlines of the intended structure being first produced, and the details and special differentiations being filled in afterward. Such being the case, it is Obviously reasonable that, at various times in the development Of the embryo, there should be very close analogies to structures found in lower and simpler organisms. Nor, when we consider that there is a grada tion in life forms, just as in the light spectrum or the musical scale, is it remarkable that a representative Of the' 'higher orders, built up in nature's fashion, as just explained, should progressively approximate higher and higher forms Of organism. But such a recapitulation as this bears no necessary and logical relation to any assumed ancestral historyz such a claim is even absurd in some particulars, as. Already seen. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Características

Produto sob encomenda Sim
Marca Forgotten Books
Cód. Barras 9781334100451
Altura 22.86 cm
I.S.B.N. 1334100454
Profundidade 0.56 cm
Referência 9781334100451
Acabamento Brochura
Ano da edição 2018
Peso 0.15 Kg
Largura 15.24 cm
AutorAUTHOR,UNKNOWN; Unknown,Author