The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página 4
... allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world ...
... allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world ...
Página 11
... allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although ...
... allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although ...
Página 12
... allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be ...
... allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be ...
Página 15
... allied to the carrier , but , instead of a long beak , has a very short and broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well excite ...
... allied to the carrier , but , instead of a long beak , has a very short and broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well excite ...
Página 20
... allied species . Some effect may be attributed to the direct and definite action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray ...
... allied species . Some effect may be attributed to the direct and definite action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray ...
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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 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