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 92
... branches proceeding from ( A ) . The modified offspring from the later and more highly improved branches in the lines of descent , will , it is probable , often take the place of , and so destroy , the earlier and less improved branches ...
... branches proceeding from ( A ) . The modified offspring from the later and more highly improved branches in the lines of descent , will , it is probable , often take the place of , and so destroy , the earlier and less improved branches ...
Página 104
... branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches , and these into lesser and lesser branches , were ...
... branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches , and these into lesser and lesser branches , were ...
Página 197
... branches . In this case the identity in nature between the arms of the pedicellariæ and the moveable branches of a spine , is unmistakable . It is generally admitted that the ordinary spines serve as a protection ; and if so , there can ...
... branches . In this case the identity in nature between the arms of the pedicellariæ and the moveable branches of a spine , is unmistakable . It is generally admitted that the ordinary spines serve as a protection ; and if so , there 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