Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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4 페이지
... cross the Primrose and the Cowslip , succeeded only once or twice in several years ; and yet it is a well- established fact that the Primrose and the Cow- slip are only varieties of the same kind of plant . Again , such cases as the ...
... cross the Primrose and the Cowslip , succeeded only once or twice in several years ; and yet it is a well- established fact that the Primrose and the Cow- slip are only varieties of the same kind of plant . Again , such cases as the ...
17 페이지
... crosses to interfere - a.race may be formed , the tendency of which to reproduce itself is exceedingly strong ; nor is the limit to the amount of divergence which may be thus produced known ; but one thing is certain , that , if certain ...
... crosses to interfere - a.race may be formed , the tendency of which to reproduce itself is exceedingly strong ; nor is the limit to the amount of divergence which may be thus produced known ; but one thing is certain , that , if certain ...
46 페이지
... crosses are of no value ; and the antipathy of wild animals of different species for one another , or even of wild and tame members of the same species , is ordinarily so great , that it is hopeless to look for such unions in Nature ...
... crosses are of no value ; and the antipathy of wild animals of different species for one another , or even of wild and tame members of the same species , is ordinarily so great , that it is hopeless to look for such unions in Nature ...
47 페이지
... cross them in the reverse way , would , with equal justice , according to the rule , pronounce them to be mere races ... crosses seems to bear no relation to the structural resemblances or differences of the members of any two groups ...
... cross them in the reverse way , would , with equal justice , according to the rule , pronounce them to be mere races ... crosses seems to bear no relation to the structural resemblances or differences of the members of any two groups ...
48 페이지
... cross , and in the hybrid produced from this cross . " In the same manner as in grafting trees , the capacity of one species or variety to take on another is incidental on generally unknown differences in their vegetative systems ; so ...
... cross , and in the hybrid produced from this cross . " In the same manner as in grafting trees , the capacity of one species or variety to take on another is incidental on generally unknown differences in their vegetative systems ; so ...
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adapted Agamogenesis Ancon animalcules animals animals and plants appear beds biological birds body bones called carbonic acid causes character Charles Darwin common course creation cross curious Darwin Darwin's views deposited direct doctrine of evolution domestic pigeons doubt endeavour epigenesis epoch Erasmus Darwin evidence ex nihilo experiments extinct fact favour forms fossil geological germ groups horse Hyæna hypothesis ichthyosaurus inorganic world inquiry kind knowledge Lamarck lectures less living male matter means mind Mivart modification natural selection naturalists observation offspring operation organic nature organisation Origin of Species parent peculiar perpetuation phenomena physiological pigeons Pikermi Pouter present primitive stock produced Quarterly Reviewer question races reason remarkable result Rock Pigeon scientific selective breeding sense sheep skeleton sort speculations spontaneous structure Suarez substance suppose Teleology tendency theory thing tion toes variation varieties vary vegetable whole