Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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페이지
... 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 apparent inheritance of acquired ...
... 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 apparent inheritance of acquired ...
12 페이지
... give rise to another kind , which would be admitted by naturalists as a distinct species . Lamarck imagined that he had discovered this vera causa in the admitted facts that some organs may be modified by exercise ; and that ...
... give rise to another kind , which would be admitted by naturalists as a distinct species . Lamarck imagined that he had discovered this vera causa in the admitted facts that some organs may be modified by exercise ; and that ...
19 페이지
... give rise to a more competent variety ( C ) , this will take its place and become a new species ; and thus , by natural selection , the species B and C will be suc- cessively derived from A. That this most ingenious hypothesis enables ...
... give rise to a more competent variety ( C ) , this will take its place and become a new species ; and thus , by natural selection , the species B and C will be suc- cessively derived from A. That this most ingenious hypothesis enables ...
36 페이지
... give rise to the metamorphosis of stamens into petals , and so forth . But however they may have crisen , what especially interests us at present is , to · remark that , once in existence , many varieties 36 I THE ORIGIN OF SPECIES.
... give rise to the metamorphosis of stamens into petals , and so forth . But however they may have crisen , what especially interests us at present is , to · remark that , once in existence , many varieties 36 I THE ORIGIN OF SPECIES.
37 페이지
... gives it what one may call an unfair advantage over the normal descendants from the same stock . This is strik- ingly exemplified by the case of Gratio Kelleia , who married a woman with the ordinary penta- dactyle extremities , and had ...
... gives it what one may call an unfair advantage over the normal descendants from the same stock . This is strik- ingly exemplified by the case of Gratio Kelleia , who married a woman with the ordinary penta- dactyle extremities , and had ...
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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