On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle of LifeAppleton, 1864 - 440 pagina's |
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Pagina 24
... Europe alone , and several even within Great Britain . One author believes that there formerly existed in Great Britain eleven wild species of sheep peculiar to it ! When we bear in mind that Britain has now hardly one peculiar mammal ...
... Europe alone , and several even within Great Britain . One author believes that there formerly existed in Great Britain eleven wild species of sheep peculiar to it ! When we bear in mind that Britain has now hardly one peculiar mammal ...
Pagina 31
... Europe and in India ; and that it agrees in habits and in a great number of points of structure with all the domestic breeds . Secondly , although an English carrier or short - faced tumbler differs immensely in certain char- acters ...
... Europe and in India ; and that it agrees in habits and in a great number of points of structure with all the domestic breeds . Secondly , although an English carrier or short - faced tumbler differs immensely in certain char- acters ...
Pagina 50
... Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago , when compar ...
... Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago , when compar ...
Pagina 64
... Europe ; and there are plants which now range in India , as I hear from Dr. Falconer , from Cape Comorin to the Himalaya , which have been imported from America since its discovery . In such cases , and endless instances could be given ...
... Europe ; and there are plants which now range in India , as I hear from Dr. Falconer , from Cape Comorin to the Himalaya , which have been imported from America since its discovery . In such cases , and endless instances could be given ...
Pagina 99
... , and there will have been less modification and less extermination . Hence , perhaps , it comes that the flora of Madeira , according to Oswald Heer , resembles the extinct flora of Europe . All CHAP . 1V.J 99 TO NATURAL SELECTION .
... , and there will have been less modification and less extermination . Hence , perhaps , it comes that the flora of Madeira , according to Oswald Heer , resembles the extinct flora of Europe . All CHAP . 1V.J 99 TO NATURAL SELECTION .
Overige edities - Alles bekijken
The Origin of Species by Means of Natural Selection: Or, The ..., Volume 1 Charles Darwin Volledige weergave - 1889 |
The Origin of Species by Means of Natural Selection,: Or the Preservation of ... Charles Darwin Volledige weergave - 1891 |
The Origin of Species by Means of Natural Selection: Or, the ..., Volume 1 Charles Darwin Volledige weergave - 1898 |
Veelvoorkomende woorden en zinsdelen
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
Populaire passages
Pagina 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.
Pagina 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.
Pagina 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.
Pagina 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...
Pagina 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.
Pagina 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.
Pagina 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.
Pagina 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.
Pagina 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.
Pagina 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.