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 v
... ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants- Nature of the checks to increase ...
... ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants- Nature of the checks to increase ...
Página xii
... range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial homologies , corrected . Mr. E. Ray ...
... range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial homologies , corrected . Mr. E. Ray ...
Página 4
... ranges widely and is very numerous , and why another 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 ...
... ranges widely and is very numerous , and why another 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 ...
Página 30
... ranges . BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly discuss whether these latter are subject to any variation . To treat this subject properly , a long ...
... ranges . BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly discuss whether these latter are subject to any variation . To treat this subject properly , a long ...
Página 33
... range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archi- pelago . Thus also with ants , the several ...
... range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archi- pelago . Thus also with ants , the several ...
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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