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 |
Результаты поиска по книге
Результаты 1 – 5 из 50
Стр. vii
... organisation terminating in the highest dicotyledons and vertebrata , these grades be- ing few in number , and generally marked by intervals of organic character which we find to be a practical difficulty in ascertaining affinities ...
... organisation terminating in the highest dicotyledons and vertebrata , these grades be- ing few in number , and generally marked by intervals of organic character which we find to be a practical difficulty in ascertaining affinities ...
Стр. x
... organisation , was formed and placed upon the surface of the globe , at long intervals , by a dis- tinct act of creative power ; and it is well to recollect that such an assumption is as unsupported by tradition or reve- lation as it is ...
... organisation , was formed and placed upon the surface of the globe , at long intervals , by a dis- tinct act of creative power ; and it is well to recollect that such an assumption is as unsupported by tradition or reve- lation as it is ...
Стр. 6
... organised structures variable - Parts developed in an unusual manner are highly variable : specific characters more variable than generic secondary sexual characters variable - Species of the same genus vary in an analogous manner - Re ...
... organised structures variable - Parts developed in an unusual manner are highly variable : specific characters more variable than generic secondary sexual characters variable - Species of the same genus vary in an analogous manner - Re ...
Стр. 15
... organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male ...
... organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male ...
Стр. 18
... organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inheritable is unimportant for us . But the number and diversity of inheritable de ...
... organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inheritable is unimportant for us . But the number and diversity of inheritable de ...
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
The Origin of Species by Means of Natural Selection: Or, the ..., Том 1 Charles Darwin Полный просмотр - 1898 |
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
Популярные отрывки
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.