The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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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 ...
408 페이지
... seeds ; I have tried several little experiments , but will here give only the most striking case : I took in February three tablespoonfuls of mud from three different points , beneath water , on the edge of a little pond ; this mud when ...
... seeds ; I have tried several little experiments , but will here give only the most striking case : I took in February three tablespoonfuls of mud from three different points , beneath water , on the edge of a little pond ; this mud when ...
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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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate 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 variability variations varieties vary whole widely different wings young