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 86
... adapted in the most perfect manner to each other , by the continued pre- servation of individuals presenting mutual and slightly favourable deviations of structure . I am well aware that this doctrine of natural selec- tion ...
... adapted in the most perfect manner to each other , by the continued pre- servation of individuals presenting mutual and slightly favourable deviations of structure . I am well aware that this doctrine of natural selec- tion ...
Página 89
... adapted solely to ensure self - fertilisation ; and no doubt it is useful for this end but , the agency of insects is often required to cause the stamens to spring forward , as Kölreuter has shown to be the case with the barberry ; and ...
... adapted solely to ensure self - fertilisation ; and no doubt it is useful for this end but , the agency of insects is often required to cause the stamens to spring forward , as Kölreuter has shown to be the case with the barberry ; and ...
Página 95
... adapted organisms , after any physical change , such as of climate or elevation of the land , etc .; and thus new places in the natural economy of the country are left open for the old inhabitants to struggle for , and become adapted to ...
... adapted organisms , after any physical change , such as of climate or elevation of the land , etc .; and thus new places in the natural economy of the country are left open for the old inhabitants to struggle for , and become adapted to ...
Página 98
... adapted forms having been checked . But the action of natural selection will probably still oftener depend on some of the inhabitants becoming slowly modified ; the mutual relations of many of the other inhabitants being thus disturbed ...
... adapted forms having been checked . But the action of natural selection will probably still oftener depend on some of the inhabitants becoming slowly modified ; the mutual relations of many of the other inhabitants being thus disturbed ...
Página 104
... adapted for their own country . It might , also , perhaps have been expected that naturalised plants would have belonged to a few groups more especially adapted to certain stations in their new homes . But the case is very different ...
... adapted for their own country . It might , also , perhaps have been expected that naturalised plants would have belonged to a few groups more especially adapted to certain stations in their new homes . But the case is very different ...
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