The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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17 페이지
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
482 페이지
... admit that we know enough of the constitution of the universe and of the interior of our globe to speculate with safety on its past duration . That the geological record is imperfect all will admit ; but that it is imperfect to the ...
... admit that we know enough of the constitution of the universe and of the interior of our globe to speculate with safety on its past duration . That the geological record is imperfect all will admit ; but that it is imperfect to the ...
498 페이지
... admit that a multi- tude of forms , which till lately they themselves thought were special creations , and which are still thus looked at by the majority of naturalists , and which consequently have all the external characteristic ...
... admit that a multi- tude of forms , which till lately they themselves thought were special creations , and which are still thus looked at by the majority of naturalists , and which consequently have all the external characteristic ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young