The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 30
... namely , the improba- bility of man having formerly made seven or eight supposed species of pigeons to breed freely under do- mestication ; these supposed species being quite un- known in a wild state , and their not having become ...
... namely , the improba- bility of man having formerly made seven or eight supposed species of pigeons to breed freely under do- mestication ; these supposed species being quite un- known in a wild state , and their not having become ...
Página 32
... namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are firmly convinced that the several breeds to which each has attended ...
... namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are firmly convinced that the several breeds to which each has attended ...
Página 37
... namely , by comparing the diversity of flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen garden , in comparison with ...
... namely , by comparing the diversity of flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen garden , in comparison with ...
Página 41
... namely , the production of two distinct strains . The two flocks of Leicester sheep kept by Mr. Buckley and Mr. Burgess , as Mr. Youatt remarks , " have been purely bred from the original stock of Mr. Bakewell for upwards of fifty years ...
... namely , the production of two distinct strains . The two flocks of Leicester sheep kept by Mr. Buckley and Mr. Burgess , as Mr. Youatt remarks , " have been purely bred from the original stock of Mr. Bakewell for upwards of fifty years ...
Página 45
... namely , that we know hardly anything about the origin or history of any of our domestic breeds . But , in fact , a breed , like a dialect of a language , can hardly be said to have a distinct origin . A man preserves and breeds from an ...
... namely , that we know hardly anything about the origin or history of any of our domestic breeds . But , in fact , a breed , like a dialect of a language , can hardly be said to have a distinct origin . A man preserves and breeds from an ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray 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 effects eggs embryo existing extinct extremely facts favourable fertilised 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 kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young