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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384 페이지
... seeds after- ward germinated ; the ripe seeds of Helosciadium sunk in two days , when dried they floated for above ninety days , and afterward germinated . Altogether , out of the ninety- four dried plants , eighteen floated for above ...
... seeds after- ward germinated ; the ripe seeds of Helosciadium sunk in two days , when dried they floated for above ninety days , and afterward germinated . Altogether , out of the ninety- four dried plants , eighteen floated for above ...
385 페이지
... seeds or fruit which , as Alph . de Candolle has shown , generally have restricted ranges , could hardly be trans- ported by any other means . Seeds may be occasionally transported in another manner . Drift timber is thrown up on most ...
... seeds or fruit which , as Alph . de Candolle has shown , generally have restricted ranges , could hardly be trans- ported by any other means . Seeds may be occasionally transported in another manner . Drift timber is thrown up on most ...
386 페이지
... seeds capable of germination . Some seeds of the oat , wheat , millet , canary , hemp , clover , and beet germinated after having been from twelve to twenty - one hours in the stomachs of different birds of prey ; and two seeds of beet ...
... seeds capable of germination . Some seeds of the oat , wheat , millet , canary , hemp , clover , and beet germinated after having been from twelve to twenty - one hours in the stomachs of different birds of prey ; and two seeds of beet ...
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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