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 83
... advantage , the process of modification would be very slow , and there would be simultaneously the most rigor- ous selection of the young birds within the egg , which had the most powerful and hardest beaks , for all with weak beaks ...
... advantage , the process of modification would be very slow , and there would be simultaneously the most rigor- ous selection of the young birds within the egg , which had the most powerful and hardest beaks , for all with weak beaks ...
Page 85
... advantage over other males , in their weapons , means of defence , or charms ; and have transmitted these advantages to their male offspring . Yet , I would not wish to attribute all such sexual differences to this agen- cy : for we see ...
... advantage over other males , in their weapons , means of defence , or charms ; and have transmitted these advantages to their male offspring . Yet , I would not wish to attribute all such sexual differences to this agen- cy : for we see ...
Page 88
... advantage of what has been called the " phy siological division of labour ; " hence we may believe that it would be advantageous to a plant to produce stamens alone in one flower or on one whole plant , and pistils alone in another ...
... advantage of what has been called the " phy siological division of labour ; " hence we may believe that it would be advantageous to a plant to produce stamens alone in one flower or on one whole plant , and pistils alone in another ...
Page 89
... advantage to the hive - bee to have a slightly longer or differently constructed pro- boscis . On the other hand , I have found by experiment that the fertility of clover greatly depends on bees visiting and moving parts of the corolla ...
... advantage to the hive - bee to have a slightly longer or differently constructed pro- boscis . On the other hand , I have found by experiment that the fertility of clover greatly depends on bees visiting and moving parts of the corolla ...
Page 90
... birth . Modern research has much diminished the number of supposed hermaphro- dites , and of real hermaphrodites a large number pair ; that is , two individuals regularly unite for reproduction , 90 [ CHAP . IV . ON THE ADVANTAGE.
... birth . Modern research has much diminished the number of supposed hermaphro- dites , and of real hermaphrodites a large number pair ; that is , two individuals regularly unite for reproduction , 90 [ CHAP . IV . ON THE ADVANTAGE.
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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.