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 xiii
... vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each ...
... vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each ...
Página 9
... vary , and likewise to withstand diverse climates . I do not dispute that these capacities have added largely to the value of most of our domesticated productions : but how could a savage possibly know , when he first tamed an animal ...
... vary , and likewise to withstand diverse climates . I do not dispute that these capacities have added largely to the value of most of our domesticated productions : but how could a savage possibly know , when he first tamed an animal ...
Página 89
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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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