Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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3 페이지
... known from a mere variety ? Is there no criterion of species ? Great authori- ties affirm that there is that the unions of members of the same species are always fertile , while those of distinct species are either sterile , or their ...
... known from a mere variety ? Is there no criterion of species ? Great authori- ties affirm that there is that the unions of members of the same species are always fertile , while those of distinct species are either sterile , or their ...
7 페이지
... known species of animal or plants ( witness our recent examples from the work of Sir Emerson Tennent , on Ceylon ) , and yet they have almost always a sort of general family resemblance to the animals and plants of the nearest mainland ...
... known species of animal or plants ( witness our recent examples from the work of Sir Emerson Tennent , on Ceylon ) , and yet they have almost always a sort of general family resemblance to the animals and plants of the nearest mainland ...
8 페이지
... known of it . But our knowledge of life is not confined to the existing world . Whatever their minor differences , geologists are agreed as to the vast thickness of the accumulated strata which compose the visible part of our earth ...
... known of it . But our knowledge of life is not confined to the existing world . Whatever their minor differences , geologists are agreed as to the vast thickness of the accumulated strata which compose the visible part of our earth ...
17 페이지
... known ; but one thing is certain , that , if certain breeds of dogs , or of pigeons , or of horses , were known only in a fossil state , no naturalist would hesitate in regarding them as distinct species . But in all these cases we have ...
... known ; but one thing is certain , that , if certain breeds of dogs , or of pigeons , or of horses , were known only in a fossil state , no naturalist would hesitate in regarding them as distinct species . But in all these cases we have ...
28 페이지
... known only by the study of their skins , or bones , or other lifeless exuviæ ; that we are acquainted with none , or next to none , of their physiological peculiarities , beyond those which can be deduced from their structure , or are ...
... known only by the study of their skins , or bones , or other lifeless exuviæ ; that we are acquainted with none , or next to none , of their physiological peculiarities , beyond those which can be deduced from their structure , or are ...
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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