The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 375
... seeds or fruit which , as Alph . de Candolle has shown , generally have restricted ranges , could hardly be transported 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 transported by any other means . Seeds may be occasionally transported in another manner . Drift timber is thrown up on most ...
Página 376
... 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 ...
Página 396
... 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 , be- neath water , on the edge of a little pond : this mud ...
... 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 , be- neath water , on the edge of a little pond : this mud ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids 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 occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young