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 75
... shown by Gärtner , the influence of the foreign pollen . When the stamens of a flower suddenly spring towards the pistil , or slowly move one after the other towards it , the contrivance seems adapted solely to ensure self ...
... shown by Gärtner , the influence of the foreign pollen . When the stamens of a flower suddenly spring towards the pistil , or slowly move one after the other towards it , the contrivance seems adapted solely to ensure self ...
Página 212
... shown that this does sometimes happen - then the resemblance between what originally was a habit and an instinct becomes so close as not to be distinguished . If Mozart , instead of playing the pianoforte at three years old with ...
... shown that this does sometimes happen - then the resemblance between what originally was a habit and an instinct becomes so close as not to be distinguished . If Mozart , instead of playing the pianoforte at three years old with ...
Página 399
... shown to be homologous , only a few serial homologies , such as the valves of Chitons , can be indicated ; that is , we are seldom enabled to say that one part is homologous with another part in the same individual . And we can ...
... shown to be homologous , only a few serial homologies , such as the valves of Chitons , can be indicated ; that is , we are seldom enabled to say that one part is homologous with another part in the same individual . And we can ...
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