On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle of Life |
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Page 19
... principle by theoretical writers alone . When any devia- tion of structure often appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst ...
... principle by theoretical writers alone . When any devia- tion of structure often appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst ...
Page 29
... feathers , as any wild rock- pigeon . We can understand these facts , on the well- known principle of reversion to ancestral characters , if all the domestic breeds have descended from the rock - pigeon CHAP . I. ] 29 DOMESTIC PIGEONS .
... feathers , as any wild rock- pigeon . We can understand these facts , on the well- known principle of reversion to ancestral characters , if all the domestic breeds have descended from the rock - pigeon CHAP . I. ] 29 DOMESTIC PIGEONS .
Page 34
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . In order fully to realise what they have ...
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . In order fully to realise what they have ...
Page 35
... principle of selection in regard to merino sheep is so fully recognised , that men follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of ...
... principle of selection in regard to merino sheep is so fully recognised , that men follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of ...
Page 36
... principle of selection has been reduced to methodical practice for scarcely more than three - quarters of a century ; it has certainly been more attended to of late years , and many treatises have been published on the subject ; and the ...
... principle of selection has been reduced to methodical practice for scarcely more than three - quarters of a century ; it has certainly been more attended to of late years , and many treatises have been published on the subject ; and the ...
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Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 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.
Page 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...
Page 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.
Page 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.
Page 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.
Page 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.
Page 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.
Page 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.