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 14
... thus arising shall be preserved . When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely - allied species , we generally perceive in 14 ON THE ORIGIN OF SPECIES.
... thus arising shall be preserved . When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely - allied species , we generally perceive in 14 ON THE ORIGIN OF SPECIES.
Página 15
... closely - allied species of the same genus in a state of nature . I think this must be admitted , when we find that there are hardly any domestic races , either amongst animals or plants , which have not been ranked by competent judges ...
... closely - allied species of the same genus in a state of nature . I think this must be admitted , when we find that there are hardly any domestic races , either amongst animals or plants , which have not been ranked by competent judges ...
Página 16
... closely - allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
... closely - allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
Página 17
... closely resemble , perhaps are identical with , those still existing . Even if this latter fact were found more strictly and generally true than seems to me to be the case , what does it show , but that some of our breeds originated ...
... closely resemble , perhaps are identical with , those still existing . Even if this latter fact were found more strictly and generally true than seems to me to be the case , what does it show , but that some of our breeds originated ...
Página 24
... closely related together , though it is unsupported by a single experiment . But to ex- tend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , 24 ON THE ORIGIN OF SPECIES.
... closely related together , though it is unsupported by a single experiment . But to ex- tend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , 24 ON THE ORIGIN OF SPECIES.
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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