The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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16 페이지
... known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and ...
... known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and ...
18 페이지
... known principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock- pigeon . But if we deny this , we must make one of the two following highly improbable suppositions . Either , first , that ...
... known principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock- pigeon . But if we deny this , we must make one of the two following highly improbable suppositions . Either , first , that ...
19 페이지
... known record of pigeons is in the fifth Ægyptian dynasty , about 3000 B.C. , as was pointed out to me by Professor Lepsius ; but Mr. Birch informs me that pigeons are given in a bill of fare in the previous dynasty . In the time of the ...
... known record of pigeons is in the fifth Ægyptian dynasty , about 3000 B.C. , as was pointed out to me by Professor Lepsius ; but Mr. Birch informs me that pigeons are given in a bill of fare in the previous dynasty . In the time of the ...
21 페이지
... known to have been the case with the ancon sheep . But when we com- pare the dray - horse and race - horse , the dromedary and camel , the various breeds of sheep fitted either for cultivated land or mountain pasture , with the wool of ...
... known to have been the case with the ancon sheep . But when we com- pare the dray - horse and race - horse , the dromedary and camel , the various breeds of sheep fitted either for cultivated land or mountain pasture , with the wool of ...
25 페이지
... known variety , sowing its seeds , and , when a slightly better variety chanced to appear , selecting it , and so onwards . But the gardeners of the classical period , who culti- vated the best pears which they could procure , never ...
... known variety , sowing its seeds , and , when a slightly better variety chanced to appear , selecting it , and so onwards . But the gardeners of the classical period , who culti- vated the best pears which they could procure , never ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced 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