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 - 458페이지 |
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283 페이지
... hybrids should have gone on increasing . Although I know of hardly any thoroughly well - authen- ticated cases of perfectly fertile hybrid animals , I have reason to believe that the hybrids from Cervulus vaginalis and Reevesii , and ...
... hybrids should have gone on increasing . Although I know of hardly any thoroughly well - authen- ticated cases of perfectly fertile hybrid animals , I have reason to believe that the hybrids from Cervulus vaginalis and Reevesii , and ...
285 페이지
... hybrid animals , I have been sur prised to find how generally the same rules apply to both kingdoms . It has been already remarked , that the degree of fertility , both of first crosses and of hybrids , graduates from zero to perfect ...
... hybrid animals , I have been sur prised to find how generally the same rules apply to both kingdoms . It has been already remarked , that the degree of fertility , both of first crosses and of hybrids , graduates from zero to perfect ...
307 페이지
... hybrids to revert to either 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 ...
... hybrids to revert to either 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 ...
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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