On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for Life

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John Murray, 1866 - 593 páginas
 

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Take a look at the first pages after the cover...

Contenido

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xxi
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290
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Página 237 - If it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory, for such could not have been produced through natural selection.
Página xxi - ... species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species, inhabiting this world have been modified, so as to acquire that perfection of structure and coadaptation which justly excites our admiration.
Página 87 - Several writers have misapprehended or objected to the term Natural Selection. Some have even imagined that natural selection induces variability, whereas it implies only the preservation of such variations as arise and are beneficial to the being under its conditions of life.
Página 216 - If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.
Página 152 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was...
Página 70 - Hence, as more individuals are produced than can possibly survive, there must in every case be a struggle for existence, either one individual with another of the same species, or with the individuals of ^distinct species, or with the physical conditions of life. It is the doctrine of Malthus applied with manifold force to the whole animal and vegetable kingdoms; for in this case there can be no artificial increase of food, and no prudential restraint from marriage.
Página 603 - History of Rome. From the Earliest Times to the Establishment of the Empire. With the History of Literature and Art.
Página 79 - Battle within battle must be continually recurring with varying success; and yet in the...
Página 420 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
Página 90 - ... useful to any being. She can act on every internal organ, on every shade of constitutional difference, on the whole machinery of life. Man selects only for his own...

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