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 17
... parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from ...
... parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from ...
Página 18
... parent - stocks ? So it is in India . Even in the case of the domestic dogs of the whole world , which I fully admit ... parents ; and if we account for our several domestic races by this process , we must admit the former existence of ...
... parent - stocks ? So it is in India . Even in the case of the domestic dogs of the whole world , which I fully admit ... parents ; and if we account for our several domestic races by this process , we must admit the former existence of ...
Página 22
... parent - stocks possessed the characteristic enor- mous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub ...
... parent - stocks possessed the characteristic enor- mous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub ...
Página 26
... parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other large groups of birds , in nature . One circumstance has struck me much ; namely , that all the breeders of the ...
... parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other large groups of birds , in nature . One circumstance has struck me much ; namely , that all the breeders of the ...
Página 27
... parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being lineal descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have ...
... parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being lineal descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have ...
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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