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 6
... 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 18
... 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 19
... 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 24
... 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 34
... allied species . Some effect may be at- tributed 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 at- tributed 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
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