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 33
... whole body of English racehorses have come to surpass in fleetness and size the parent Arab stock , so that the latter , by the regulations for the Goodwood Races , are favoured in the weights they carry . Lord Spencer and others have ...
... whole body of English racehorses have come to surpass in fleetness and size the parent Arab stock , so that the latter , by the regulations for the Goodwood Races , are favoured in the weights they carry . Lord Spencer and others have ...
Página 49
... whole subject , however , treated as it necessarily here is , with much brevity , is rather perplexing , and allusions cannot be avoided to the ' struggle for exist- ence , ' ' divergence of character , ' and other questions , hereafter ...
... whole subject , however , treated as it necessarily here is , with much brevity , is rather perplexing , and allusions cannot be avoided to the ' struggle for exist- ence , ' ' divergence of character , ' and other questions , hereafter ...
Página 59
... whole animal and vegetable kingdoms ; for in this case there can be no artificial increase of food , and no prudential restraint from marriage . Although some species may be now increasing , more or less rapidly , in numbers , all ...
... whole animal and vegetable kingdoms ; for in this case there can be no artificial increase of food , and no prudential restraint from marriage . Although some species may be now increasing , more or less rapidly , in numbers , all ...
Página 60
... whole islands in a period of less than ten years . Several of the plants , such as the cardoon and a tall thistle , now most numerous over the wide plains of La Plata , clothing square leagues of surface almost to the exclusion of all ...
... whole islands in a period of less than ten years . Several of the plants , such as the cardoon and a tall thistle , now most numerous over the wide plains of La Plata , clothing square leagues of surface almost to the exclusion of all ...
Página 64
... whole effect to its direct action . But this is a false view we forget that each species , even where it most abounds , is constantly suffering enormous de- struction at some period of its life , from enemies or from competitors for the ...
... whole effect to its direct action . But this is a false view we forget that each species , even where it most abounds , is constantly suffering enormous de- struction at some period of its life , from enemies or from competitors for the ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
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