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 7
... domestic varieties , when run wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain ...
... domestic varieties , when run wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain ...
Página 8
... domestic domestic varieties ; animals and plants , and compare them with closely allied species , we Difficulty of generally perceive in each domestic race , as already remarked , less between varieties uniformity of character than in ...
... domestic domestic varieties ; animals and plants , and compare them with closely allied species , we Difficulty of generally perceive in each domestic race , as already remarked , less between varieties uniformity of character than in ...
Página 461
... domestic pigeons , 13 . Colymbetes , 357 . Compensation of growth , 118 . Compositæ , flowers and seeds of , 116 . outer and inner florets of , 178 . male flowers of , 412 . Conclusion , general , 436 . Conditions , slight changes in ...
... domestic pigeons , 13 . Colymbetes , 357 . Compensation of growth , 118 . Compositæ , flowers and seeds of , 116 . outer and inner florets of , 178 . male flowers of , 412 . Conclusion , general , 436 . Conditions , slight changes in ...
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