Evolution: A Lecture Read Before the Nineteenth Century Club, in the City of New York, May 25, 1886 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Evolution: A Lecture Read Before the Nineteenth Century Club, in the City of New York, May 25, 1886

Another argument of the biologist is founded on the observation of embryos or germs in their progressive stages, each of which is supposed to represent some one of the progressive types of life. This is especially conspicuous in the animal world. Thus the human embryo, as it is con tended, furnishes in its growth a miniature transcript of the order in which animal life has been evolved through its several stages, from the lowest up to man. Here again there is no agreement as to the facts; some contending that the transition from one stage of the embryo to another, as in the advance from the simpler to the more complex, is a progress from the generic to the specific, or, as the evolutionist would say, from the homogeneous to the heterogeneous. But, admitting this progress, it would be as true of logical as it is of natural growth, and is as consistent with the evolution of a plan which is provided for in the constitution of each indi vidual germ, as it is with the influence of environment upon one indefinitely variable nucleus or cell.

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