Darwiniana: EssaysD. Appleton, 1897 - 475페이지 |
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2 페이지
... varies as much as theory . Let two botanists or two zoologists examine and describe the productions of a country , and one will pretty certainly disagree with the other as to the number , limits , and definitions of the species into ...
... varies as much as theory . Let two botanists or two zoologists examine and describe the productions of a country , and one will pretty certainly disagree with the other as to the number , limits , and definitions of the species into ...
40 페이지
... a race was pro- duced , because , for several generations , care was taken to select both parents of the breeding stock from animals exhibiting a tendency to vary in the same direction ; while , in the other , no 40 H THE ORIGIN OF SPECIES.
... a race was pro- duced , because , for several generations , care was taken to select both parents of the breeding stock from animals exhibiting a tendency to vary in the same direction ; while , in the other , no 40 H THE ORIGIN OF SPECIES.
41 페이지
... vary more or less from the normal type ; and there is no variation which may not be transmitted and which , if selectively transmitted , may not become the foundation of a race . This great truth , sometimes forgotten by philosophers ...
... vary more or less from the normal type ; and there is no variation which may not be transmitted and which , if selectively transmitted , may not become the foundation of a race . This great truth , sometimes forgotten by philosophers ...
50 페이지
... vary ; and the variation may be perpetuated by selection , as a race , which race , in many cases , presents all the characteristics of a morphological species . But it is not as yet proved that a race ever exhibits , when crossed with ...
... vary ; and the variation may be perpetuated by selection , as a race , which race , in many cases , presents all the characteristics of a morphological species . But it is not as yet proved that a race ever exhibits , when crossed with ...
83 페이지
... vary indefinitely ; and secondly , from something in the surrounding world which helped all variations in the direction of an accurate time - keeper , and checked all those in other directions ; then it is obvious that the force of ...
... vary indefinitely ; and secondly , from something in the surrounding world which helped all variations in the direction of an accurate time - keeper , and checked all those in other directions ; then it is obvious that the force of ...
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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