Darwiniana: EssaysAppleton, 1894 - 475페이지 |
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vi 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 " true " at once , and showing no mixed forms , even when crossed with another breed . 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 " true " at once , and showing no mixed forms , even when crossed with another breed . 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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action adapted admit Agamogenesis Ancon animalcules animals animals and plants appears biology birds body called causes character Charles Darwin course creation Crustacea Darwin Darwin's views Darwinian deposited direct doctrine of evolution doubt Dysteleology endeavour epigenesis epoch Erasmus Darwin essay 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 present primitive stock principles produced Quarterly Reviewer question races reason remarkable result scientific selective breeding sensations sense special creation speculations structure Suarez substantial forms suppose Teleology tendency theory thing thought tion toes truth variation varieties vegetabilia vegetable vera causa Wallace whole