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 90
... modified descendants of the common parent ( A ) , will generally go on increasing in number and diverging in ... modified descendant ; for natural selection will always act according to the nature of the places which are either ...
... modified descendants of the common parent ( A ) , will generally go on increasing in number and diverging in ... modified descendant ; for natural selection will always act according to the nature of the places which are either ...
Página 93
... descendants ; and this is shown in the diagram by the dotted lines unequally prolonged upwards . But during the process of modification , represented in the diagram , another of our principles , namely that of extinction , will have ...
... descendants ; and this is shown in the diagram by the dotted lines unequally prolonged upwards . But during the process of modification , represented in the diagram , another of our principles , namely that of extinction , will have ...
Página 384
... descent . All the modified descendants from A will have inherited something in common from their common parent , as will all the descendants from I ; so will it be with each subordinate branch of descendants , at each successive stage ...
... descent . All the modified descendants from A will have inherited something in common from their common parent , as will all the descendants from I ; so will it be with each subordinate branch of descendants , at each successive stage ...
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