On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 114
... living at any one period , extremely few will transmit descendants to a remote futurity . I shall have to return to this subject in the chapter on Classification , but I may add that on this view of extremely few of the more ancient ...
... living at any one period , extremely few will transmit descendants to a remote futurity . I shall have to return to this subject in the chapter on Classification , but I may add that on this view of extremely few of the more ancient ...
Página 116
... living beings can be supported on the same area the more they diverge in structure , habits , and constitution , of which we see proof by looking to the inhabitants of any small spot or to naturalised productions . Therefore during the ...
... living beings can be supported on the same area the more they diverge in structure , habits , and constitution , of which we see proof by looking to the inhabitants of any small spot or to naturalised productions . Therefore during the ...
Página 117
... living species in groups subordinate to groups . Of the many twigs which flou- rished when the tree was a mere bush , only two or three , now grown into great branches , yet survive and bear all the other branches ; so with the species ...
... living species in groups subordinate to groups . Of the many twigs which flou- rished when the tree was a mere bush , only two or three , now grown into great branches , yet survive and bear all the other branches ; so with the species ...
Página 120
... living in shallow water , are more brightly coloured than those of the same species further north or from greater depths . Gould believes that birds of the same species are more brightly coloured under a clear atmosphere , than when living ...
... living in shallow water , are more brightly coloured than those of the same species further north or from greater depths . Gould believes that birds of the same species are more brightly coloured under a clear atmosphere , than when living ...
Página 121
... living under the most opposite climates . Such considerations as these incline me to lay very little weight on the direct action of the conditions of life . Indirectly , as already remarked , they seem to play an important part in ...
... living under the most opposite climates . Such considerations as these incline me to lay very little weight on the direct action of the conditions of life . Indirectly , as already remarked , they seem to play an important part in ...
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Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely