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
... Effects of habit and the use or disuse of parts - Correlated variation - Inheritance - Character of domestic varieties - Difficulty of dis- tinguishing between varieties and species - Origin of domestic varieties from one or more ...
... Effects of habit and the use or disuse of parts - Correlated variation - Inheritance - Character of domestic varieties - Difficulty of dis- tinguishing between varieties and species - Origin of domestic varieties from one or more ...
Página 108
... effects of long - continued use or disuse , for we know not the parent - forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
... effects of long - continued use or disuse , for we know not the parent - forms ; but many animals possess structures which can be best explained by the effects of disuse . As Professor Owen has remarked , there is no greater anomaly in ...
Página 194
... effects of the increased and beneficial use of any part . How much to attribute in each particular case to the effects of use , and how much to natural selection , it seems impossible to decide . I may give another instance of a ...
... effects of the increased and beneficial use of any part . How much to attribute in each particular case to the effects of use , and how much to natural selection , it seems impossible to decide . I may give another instance of a ...
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