The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 538페이지 |
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... instance out of several which I have observed : I crossed some white fantails , which breed very true , with some black barbs - and it so happens that blue varieties of barbs are so rare that I never heard of an instance in England ...
... instance out of several which I have observed : I crossed some white fantails , which breed very true , with some black barbs - and it so happens that blue varieties of barbs are so rare that I never heard of an instance in England ...
282 페이지
... instance , Herbert asserts that a hybrid from Calceolaria integrifolia and plantaginea , species most widely dissimilar in general habit , " reproduces itself as perfectly as if it had been a natural species from the mountains of Chili ...
... instance , Herbert asserts that a hybrid from Calceolaria integrifolia and plantaginea , species most widely dissimilar in general habit , " reproduces itself as perfectly as if it had been a natural species from the mountains of Chili ...
448 페이지
... instance , of birds from all other vertebrate animals - by the belief that many ancient forms of life have been utterly lost , through which the early pro- genitors of birds were formerly connected with the early progenitors of the ...
... instance , of birds from all other vertebrate animals - by the belief that many ancient forms of life have been utterly lost , through which the early pro- genitors of birds were formerly connected with the early progenitors of the ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young