The Scientific Evidences of Organic Evolution

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Macmillan and Company, 1882 - Всего страниц: 88
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Стр. 3 - natural selection." Nature, so to speak, selects the best individuals out of each gen'eration to live. And not only so, but as these favored individuals transmit their favorable qualities to their offspring, according to the fixed laws of heredity, it follows that the individuals composing each successive generation have a general tendency to be better suited to their surroundings than were their forefathers. And this follows, not...
Стр. 76 - ... conceivable supposition that every species of Rhinoceros and every species of Hyaena, in the long succession of forms between the Miocene and the present species, was separately constructed out of dust, or out of nothing, by supernatural power; but until I receive distinct evidence of the fact, I refuse to run the risk of insulting any sane man by supposing that he seriously holds such a notion.
Стр. 61 - as the white man's rat has driven away the native rat, so the European fly drives away our own ; and as the clover kills our fern, so will the Maori disappear before the white man himself.
Стр. 49 - A second great fact which strikes us in our general review is, that barriers of any kind, or obstacles to free migration, are related in a close and important manner to the differences between the productions of various regions.
Стр. 39 - Throughout the animal and vegetable kingdoms we constantly meet with organs which are the dwarfed and useless representatives of organs which, in other and allied kinds of animals and plants, are of large size and functional utility. Thus, for instance, the unborn whale has rudimentary teeth, which are never destined to cut the gums ; and we all know that our own rudimentary tail is of no practical service. Now, rudimentary organs of this kind are of such 1 This consideration is, I believe, original.
Стр. 3 - That is to say, in every generation of every species a great many more individuals are born than can possibly survive; so that there is in consequence a perpetual battle for life going on among all the constituent individuals of any given generation.
Стр. 41 - Now, is it a worthy conception of Deity that, while neglecting to maintain his unity of ideal in the case of nearly all the numerous species of snakes, he should have added a tiny rudiment in the case of the Python— and even in that case should have maintained his ideal very inefficiently, inasmuch as only two limbs, instead of four, are represented...

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