Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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19 페이지
... change in any degree , however slight , B may no longer be that form which is best adapted to with- stand their destructive , and profit by their sus- taining , influence ; in which case if it should give rise to a more competent ...
... change in any degree , however slight , B may no longer be that form which is best adapted to with- stand their destructive , and profit by their sus- taining , influence ; in which case if it should give rise to a more competent ...
29 페이지
... changes [ When this sentence was written , it was generally believed that the original nucleus of the egg ( the germinal vesicle ) disappeared . 1893. ] so rapid , yet so steady and purposelike in their II 29 THE ORIGIN OF SPECIES.
... changes [ When this sentence was written , it was generally believed that the original nucleus of the egg ( the germinal vesicle ) disappeared . 1893. ] so rapid , yet so steady and purposelike in their II 29 THE ORIGIN OF SPECIES.
36 페이지
... changes in physical conditions , as in climate , in food , or the like , did not take place and had nothing to do ... change colour , to increase or diminish the size of muscles , to modify constitution , and , among plants , to give ...
... changes in physical conditions , as in climate , in food , or the like , did not take place and had nothing to do ... change colour , to increase or diminish the size of muscles , to modify constitution , and , among plants , to give ...
43 페이지
... changes in what are commonly called external circumstances , upon the wild rock - pigeon . On the contrary , from time immemorial pigeon - fanciers have had essentially similar methods of treating their pets , which have been housed ...
... changes in what are commonly called external circumstances , upon the wild rock - pigeon . On the contrary , from time immemorial pigeon - fanciers have had essentially similar methods of treating their pets , which have been housed ...
48 페이지
... changes in the con- ditions of life are apparently favourable to the vigour and fertility of all organic beings . It is not surprising that the degree of difficulty in uniting two species , and the degree of sterility of their hybrid ...
... changes in the con- ditions of life are apparently favourable to the vigour and fertility of all organic beings . It is not surprising that the degree of difficulty in uniting two species , and the degree of sterility of their hybrid ...
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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