On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle of LifeAppleton, 1864 - Всего страниц: 440 |
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Стр. vii
... organic character which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse con- nected with the vital forces , tending in the course of gen- erations to modify organic structures in accordance ...
... organic character which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse con- nected with the vital forces , tending in the course of gen- erations to modify organic structures in accordance ...
Стр. viii
... organic beings with remarkable skill and force . He argues from the analogy of domestic pro- ductions , from the changes which the embryos of many species undergo , from the difficulty of distinguishing spe- cies and varieties , and ...
... organic beings with remarkable skill and force . He argues from the analogy of domestic pro- ductions , from the changes which the embryos of many species undergo , from the difficulty of distinguishing spe- cies and varieties , and ...
Стр. 7
... ORGANIC BEINGS . On the slow and successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same gen- eral rules in their appearance and disappearance as ...
... ORGANIC BEINGS . On the slow and successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same gen- eral rules in their appearance and disappearance as ...
Стр. 10
... organic beings , on their embryological relations , their geographical distribution , geological succession , and other such facts , might come to the conclusion that each species had not been independently created , but had de- scended ...
... organic beings , on their embryological relations , their geographical distribution , geological succession , and other such facts , might come to the conclusion that each species had not been independently created , but had de- scended ...
Стр. 11
... organic beings , by the effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and coadapta- tion . At ...
... organic beings , by the effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and coadapta- tion . At ...
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On the Origin of Species by Means of Natural Selection: Or The ..., Том 2 Charles Darwin Полный просмотр - 1888 |
Часто встречающиеся слова и выражения
accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely
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Стр. 424 - In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
Стр. 63 - There is no exception to the rule that every organic being naturally increases at so high a rate, that, if not destroyed, the earth would soon be covered by the progeny of a single pair.
Стр. 79 - I may be allowed to personify the natural preservation or survival of the fittest, cares nothing for appearances, except in so far as they are 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 good: Nature only for that of the being which she tends.
Стр. 70 - I counted thirtytwo little trees ; and one of them, with twenty-six rings of growth, had during many years tried to raise its head above the stems of the heath, and had failed. No wonder that, as soon as the land was enclosed, it became thickly clothed with vigorously growing young firs. Yet the heath was so extremely barren and so extensive that no one would ever have imagined that cattle would have so closely and effectually searched it for food. Here we see that cattle absolutely determine the...
Стр. 169 - 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.
Стр. 63 - 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.
Стр. 167 - To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree.
Стр. 378 - Nothing can be more hopeless than to attempt to explain this similarity of pattern in members of the same class, by utility or by the doctrine of final causes. The hopelessness of the attempt has been expressly admitted by Owen in his most interesting work on the 'Nature of Limbs.
Стр. 187 - Under changed conditions of life, it is at least possible that slight modifications of instinct might be profitable to a species; and if it can be shown that instincts do vary ever so little, then I can see no difficulty in natural selection preserving and continually accumulating variations of instinct to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated.
Стр. 165 - I can see no difficulty in a race of bears being rendered, by natural selection, more and more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale.