Darwiniana: EssaysD. Appleton, 1896 - 475페이지 |
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3 페이지
... offspring , called hybrids , are so . It is affirmed not only that this is an experimental fact , but that it is a provision for the preservation of the purity of species . Such a criterion as this would be invaluable ; but ...
... offspring , called hybrids , are so . It is affirmed not only that this is an experimental fact , but that it is a provision for the preservation of the purity of species . Such a criterion as this would be invaluable ; but ...
16 페이지
... offspring are then carefully examined , and those which exhibit the peculiarity the most distinctly are selected for breeding ; and this operation is repeated until the desired amount of divergence from the primitive stock is reached ...
... offspring are then carefully examined , and those which exhibit the peculiarity the most distinctly are selected for breeding ; and this operation is repeated until the desired amount of divergence from the primitive stock is reached ...
18 페이지
... being better nourished than the others , but of their predominating over their fellows in other ways , and of having a better chance of leaving offspring , which will of course tend to reproduce the 18 THE DARWINIAN HYPOTHESIS.
... being better nourished than the others , but of their predominating over their fellows in other ways , and of having a better chance of leaving offspring , which will of course tend to reproduce the 18 THE DARWINIAN HYPOTHESIS.
19 페이지
Essays Thomas Henry Huxley. offspring , which will of course tend to reproduce the peculiarities of their parents . Their offspring will , by a parity of reasoning , tend to predominate over their contemporaries , and there being ( sup ...
Essays Thomas Henry Huxley. offspring , which will of course tend to reproduce the peculiarities of their parents . Their offspring will , by a parity of reasoning , tend to predominate over their contemporaries , and there being ( sup ...
31 페이지
... offspring into the likeness of the parent . It is the first great law of reproduction , that the offspring tends to resemble its parent or parents , more closely than anything else . Science will some day show us how this law is a ...
... offspring into the likeness of the parent . It is the first great law of reproduction , that the offspring tends to resemble its parent or parents , more closely than anything else . Science will some day show us how this law is a ...
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adapted admit Agamogenesis Ancon animalcules animals animals and plants appears believe biological birds body called causes character Charles Darwin course creation Crustacea Darwin Darwin's views Darwinian deposited direct doctrine of evolution domestic pigeons doubt Dysteleology endeavour epigenesis epoch Erasmus Darwin evidence ex nihilo exhibited existence extinct fact favour Flourens geological germ give rise groups horse Hyæna hypothesis inorganic world inquiry kind knowledge Lamarck laws lectures less living Maillet male matter means ment Mivart modification natural selection naturalists objections observation offspring organic nature organisation Origin of Species ovum parent peculiar phenomena philosophical physiological pigeons Pikermi present primitive stock produced Quarterly Reviewer question races reason remarkable result scientific selective breeding sensations sense special creation speculations spontaneous structure Suarez substantial forms suppose Teleology tendency theory thing tion toes variation varieties vegetabilia vegetable Wallace whole
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275 페이지 - In July opened first note-book on Transmutation of Species. Had been greatly struck from about the month of previous March on character of South American fossils, and species on Galapagos Archipelago. These facts (especially latter), origin of all my views."] 1836-1837.
262 페이지 - s lectures on Geology and Zoology, but they were incredibly dull The sole effect they produced on me was the determination never as long as I lived to read a book on Geology, or in any way to study the science.
279 페이지 - I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to me.
229 페이지 - History warns us, however, that it is the customary fate of new truths to begin as heresies and to end as superstitions...
112 페이지 - The teleological and the mechanical views of nature are not, necessarily, mutually exclusive. On the contrary, the more purely a mechanist the speculator is, the more firmly does he assume a primordial molecular arrangement of which all the phenomena of the universe...
162 페이지 - And if so, it must be true, in the same sense and to the same extent, that the thoughts to which I am now giving utterance, and your thoughts regarding them, are the expression of molecular changes in that matter of life which is the source of our other vital phenomena.
25 페이지 - ... maps and in museums, but by long voyages and laborious collection; having largely advanced each of these branches of science, and having spent many years in gathering and sifting materials for his present work; the store of accurately-registered facts upon which the author of the 'Origin of Species' is able to draw at will, is prodigious.
223 페이지 - natural selection " suffices for the production of species remains to be seen. Few can doubt that, if not the whole cause, it is a very important factor in that operation ; and that it must play a great part in the sorting out of varieties into those which are transitory and those which are permanent.
247 페이지 - The hour of departure has arrived, and we go our ways — I to die, and you to live. Which is better, God only knows.
255 페이지 - Lamarck and his views on evolution. I listened in silent astonishment, and as far as I can judge without any effect on my mind. I had previously read the Zoonomia of my grandfather, in which similar views are maintained, but without producing any effect on me. Nevertheless it is probable that the hearing rather early in life such views maintained and praised may have favoured my upholding them under a different form in my Origin of Species.