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 5
... allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world ...
... allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world ...
Página 14
... characters 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.
... characters 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
... allied species , we generally perceive in each domestic race , as already remarked , less uni- formity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by which ...
... allied species , we generally perceive in each domestic race , as already remarked , less uni- formity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by which ...
Página 16
... 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 has been ...
... 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 has been ...
Página 20
... allied to the carrier , but , instead of a very long beak , has a very short and very broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well ...
... allied to the carrier , but , instead of a very long beak , has a very short and very broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well ...
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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