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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283 페이지
... parent - species . The hybrids from the common and Chinese geese ( A. cygnoides ) , species which are so different that they are generally ranked in distinct genera , have often bred in this country with either pure parent , and in one ...
... parent - species . The hybrids from the common and Chinese geese ( A. cygnoides ) , species which are so different that they are generally ranked in distinct genera , have often bred in this country with either pure parent , and in one ...
307 페이지
... parent form ; but this , if it be true , is certainly only a difference in degree . More- over , Gärtner expressly states that the hybrids from long cultivated plants are more subject to reversion than hybrids from species in their ...
... parent form ; but this , if it be true , is certainly only a difference in degree . More- over , Gärtner expressly states that the hybrids from long cultivated plants are more subject to reversion than hybrids from species in their ...
461 페이지
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ...
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ...
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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