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 10
... remarked , have apparently been exposed to exactly the same conditions of life ; and this shows how unim- portant the direct effects of the conditions of life are in comparison with the laws of reproduction , of growth , and of ...
... remarked , have apparently been exposed to exactly the same conditions of life ; and this shows how unim- portant the direct effects of the conditions of life are in comparison with the laws of reproduction , of growth , and of ...
Página 15
... 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 I mean , that , although differing from each other , and from other ...
... 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 I mean , that , although differing from each other , and from other ...
Página 35
... remarked by some authors , namely , that the varieties kept by savages have more of the character of species than the varieties kept in civilised countries . On the view here given of the all - important part which selection by man has ...
... remarked by some authors , namely , that the varieties kept by savages have more of the character of species than the varieties kept in civilised countries . On the view here given of the all - important part which selection by man has ...
Página 37
... the highest importance to success . this principle Marshall has remarked , with respect to the sheep of parts of Yorkshire , that ́ as they generally On belong to poor people , and are mostly in small VARIATION UNDER DOMESTICATION 37.
... the highest importance to success . this principle Marshall has remarked , with respect to the sheep of parts of Yorkshire , that ́ as they generally On belong to poor people , and are mostly in small VARIATION UNDER DOMESTICATION 37.
Página 38
... remarked , that it was most fortunate that the straw- berry began to vary just when gardeners began to attend closely to this plant . No doubt the strawberry had always varied since it was cultivated , but the slight varieties had been ...
... remarked , that it was most fortunate that the straw- berry began to vary just when gardeners began to attend closely to this plant . No doubt the strawberry had always varied since it was cultivated , but the slight varieties had been ...
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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