On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle of LifeAppleton, 1864 - 440페이지 |
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7 페이지
... ancient forms - On the succession of the same types within the same areas - Summary of preceding and present chapters , CHAPTER XI . GEOGRAPHICAL DISTRIBUTION . 273 Present distribution cannot be accounted for by differences in physical ...
... ancient forms - On the succession of the same types within the same areas - Summary of preceding and present chapters , CHAPTER XI . GEOGRAPHICAL DISTRIBUTION . 273 Present distribution cannot be accounted for by differences in physical ...
23 페이지
... ancient records , more especially on the monuments of Egypt , much diversity in the breeds ; and that some of the breeds closely resemble , perhaps are identical with , those still existing . Even if this latter fact were found more ...
... ancient records , more especially on the monuments of Egypt , much diversity in the breeds ; and that some of the breeds closely resemble , perhaps are identical with , those still existing . Even if this latter fact were found more ...
28 페이지
... ancient times by half- civilized man , as to be quite prolific under confinement . An argument , as it seems to me , of great weight , and applicable in several other cases , is , that the above - speci- fied breeds , though agreeing ...
... ancient times by half- civilized man , as to be quite prolific under confinement . An argument , as it seems to me , of great weight , and applicable in several other cases , is , that the above - speci- fied breeds , though agreeing ...
37 페이지
... ancient Chinese encyclopædia . Ex- plicit rules are laid down by some of the Roman classical writers . From passages in Genesis , it is clear that the colour of domestic animals was at that early period at- tended to . Savages now ...
... ancient Chinese encyclopædia . Ex- plicit rules are laid down by some of the Roman classical writers . From passages in Genesis , it is clear that the colour of domestic animals was at that early period at- tended to . Savages now ...
72 페이지
... ancient Indian mounds , in the Southern United States , display the same beautiful diversity and proportion of kinds as in the sur- rounding virgin forests . What a struggle between the several kinds of trees must here have gone on ...
... ancient Indian mounds , in the Southern United States , display the same beautiful diversity and proportion of kinds as in the sur- rounding virgin forests . What a struggle between the several kinds of trees must here have gone on ...
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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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424 페이지 - 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.
63 페이지 - 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.
79 페이지 - 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.
70 페이지 - 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...
169 페이지 - 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.
63 페이지 - 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.
167 페이지 - 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.
378 페이지 - 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.
187 페이지 - 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.
165 페이지 - 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.