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 36
... hand , an animal or plant ranges over the same continent , or inhabits many islands in the same archipelago , and presents different forms in the different areas , there is always a good chance that intermediate forms will be discovered ...
... hand , an animal or plant ranges over the same continent , or inhabits many islands in the same archipelago , and presents different forms in the different areas , there is always a good chance that intermediate forms will be discovered ...
Página 41
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species , than in one having few . To test the truth of this anticipation I have ...
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species , than in one having few . To test the truth of this anticipation I have ...
Página 45
... hand of Nature . But Natural Selection , as we shall hereafter see , is a power incessantly ready for action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in ...
... hand of Nature . But Natural Selection , as we shall hereafter see , is a power incessantly ready for action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in ...
Página 50
... hand , in some cases , as with the elephant , none are destroyed by beasts of prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam . Climate plays an important part in determining the ...
... hand , in some cases , as with the elephant , none are destroyed by beasts of prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam . Climate plays an important part in determining the ...
Página 51
... hand , in many cases , a large stock of individuals of the same species , relatively to the numbers of its enemies , is absolutely necessary for its preservation . Thus we can easily raise plenty of corn and rape - seed , & c . , in our ...
... hand , in many cases , a large stock of individuals of the same species , relatively to the numbers of its enemies , is absolutely necessary for its preservation . Thus we can easily raise plenty of corn and rape - seed , & c . , in our ...
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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