Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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페이지
... breeding is definitely proved to give rise to varieties infertile with one another , the logical foundation of the theory of natural selection is incomplete . We still remain very much in the dark about the causes of variation ; the ...
... breeding is definitely proved to give rise to varieties infertile with one another , the logical foundation of the theory of natural selection is incomplete . We still remain very much in the dark about the causes of variation ; the ...
15 페이지
... breeds and styes of bloated preposterous pigs , no more like a wild boar or sow than a city alderman is like an ourang - outang . The cattle show has been , and perhaps may again be , succeeded by a poultry show , of whose crowing and ...
... breeds and styes of bloated preposterous pigs , no more like a wild boar or sow than a city alderman is like an ourang - outang . The cattle show has been , and perhaps may again be , succeeded by a poultry show , of whose crowing and ...
16 페이지
... breed with the peculiarity in question strongly marked , he selects such male and female indi- viduals as exhibit the desired character , and breeds from them . Their offspring are then carefully examined , and those which exhibit the ...
... breed with the peculiarity in question strongly marked , he selects such male and female indi- viduals as exhibit the desired character , and breeds from them . Their offspring are then carefully examined , and those which exhibit the ...
17 페이지
... breeding , that is , from well- marked forms , and allowing no impure crosses to interfere - a.race may be formed ... breeds of dogs , or of pigeons , or of horses , were known only in a fossil state , no naturalist would hesitate in ...
... breeding , that is , from well- marked forms , and allowing no impure crosses to interfere - a.race may be formed ... breeds of dogs , or of pigeons , or of horses , were known only in a fossil state , no naturalist would hesitate in ...
39 페이지
... breeding at once , and showing no mixed forms , even when crossed with another breed . " true " " By taking care to select Ancons of both sexes , for breeding from , it thus became easy to establish an extremely well - marked race ; so ...
... breeding at once , and showing no mixed forms , even when crossed with another breed . " true " " By taking care to select Ancons of both sexes , for breeding from , it thus became easy to establish an extremely well - marked race ; 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