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 122
... hand , and the tendency to reversion and variability on the other hand , will in the course of time cease ; and that the most abnormally developed organs may be made constant , I see no reason to doubt . Hence , when an organ , however ...
... hand , and the tendency to reversion and variability on the other hand , will in the course of time cease ; and that the most abnormally developed organs may be made constant , I see no reason to doubt . Hence , when an organ , however ...
Página 217
... hand , habit alone in some cases has sufficed ; hardly any animal is more difficult to tame than the young of the wild rabbit ; scarcely any animal is tamer than the young of the tame rabbit ; but I can hardly suppose that domestic ...
... hand , habit alone in some cases has sufficed ; hardly any animal is more difficult to tame than the young of the wild rabbit ; scarcely any animal is tamer than the young of the tame rabbit ; but I can hardly suppose that domestic ...
Página 377
... hand have , on this same principle , much in common , and form a sub - family , distinct from that containing the next two genera on the right hand , which diverged from a common parent at the fifth stage of descent . These five genera ...
... hand have , on this same principle , much in common , and form a sub - family , distinct from that containing the next two genera on the right hand , which diverged from a common parent at the fifth stage of descent . These five genera ...
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