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 29
... origin of our domestic races of animals and plants . Changed conditions of life are of the highest importance in causing variability , both by acting directly on the organisation , and indirectly by affecting the reproductive system ...
... origin of our domestic races of animals and plants . Changed conditions of life are of the highest importance in causing variability , both by acting directly on the organisation , and indirectly by affecting the reproductive system ...
Página 211
... origin of the different in their mental powers , any more than I have with that of life itself . We are concerned only with the diversities of instinct and of the other mental faculties in animals of the same class . I will not attempt ...
... origin of the different in their mental powers , any more than I have with that of life itself . We are concerned only with the diversities of instinct and of the other mental faculties in animals of the same class . I will not attempt ...
Página 444
... origin of man and his history . Authors of the highest eminence seem to be fully satisfied with the view that each species has been independently created . To my mind it accords better with what we know of the laws impressed on matter ...
... origin of man and his history . Authors of the highest eminence seem to be fully satisfied with the view that each species has been independently created . To my mind it accords better with what we know of the laws impressed on matter ...
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