On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 8
... allied species , we Difficulty of generally perceive in each domestic race , as already remarked , less between varieties uniformity of character than in true species . Domestic races often have and species ; a somewhat monstrous ...
... allied species , we Difficulty of generally perceive in each domestic race , as already remarked , less between varieties uniformity of character than in true species . Domestic races often have and species ; a somewhat monstrous ...
Página 44
... allied together , forming little clusters round other species . Species very closely allied to other species apparently have restricted ranges . In all these respects the species of large genera present a strong analogy with varieties ...
... allied together , forming little clusters round other species . Species very closely allied to other species apparently have restricted ranges . In all these respects the species of large genera present a strong analogy with varieties ...
Página 322
... allied huge monsters , which formerly lived in South America , have left behind them the sloth , armadillo , and anteater , as their degenerate descendants . This cannot for an instant be admitted . These huge animals have become wholly ...
... allied huge monsters , which formerly lived in South America , have left behind them the sloth , armadillo , and anteater , as their degenerate descendants . This cannot for an instant be admitted . These huge animals have become wholly ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young