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 |
Dentro del libro
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Página 76
... males to struggle for the females . He does not rigidly destroy all inferior animals , but protects during each varying season , as far as lies in his power , all his productions . He often begins his selection by some half - monstrous ...
... males to struggle for the females . He does not rigidly destroy all inferior animals , but protects during each varying season , as far as lies in his power , all his productions . He often begins his selection by some half - monstrous ...
Página 80
... male stag - beetles often bear wounds from the huge mandibles of other males . The war is , perhaps , severest between the males of polygamous animals , and these seem oftenest pro- vided with special weapons . The males of carnivorous ...
... male stag - beetles often bear wounds from the huge mandibles of other males . The war is , perhaps , severest between the males of polygamous animals , and these seem oftenest pro- vided with special weapons . The males of carnivorous ...
Página 81
... males of many species to attract by singing the females . The rock - thrush of Guiana , birds of Paradise , and some others , congregate ; and successive males display their gorgeous plumage and perform strange antics before the females ...
... males of many species to attract by singing the females . The rock - thrush of Guiana , birds of Paradise , and some others , congregate ; and successive males display their gorgeous plumage and perform strange antics before the females ...
Página 82
... male sex in our domestic animals ( as the wattle in male carriers , horn - like protuberances in the cocks of certain fowls , etc. ) , which we cannot believe to be either useful to the males in battle , or attractive to the females ...
... male sex in our domestic animals ( as the wattle in male carriers , horn - like protuberances in the cocks of certain fowls , etc. ) , which we cannot believe to be either useful to the males in battle , or attractive to the females ...
Página 84
... male flowers , which have four stamens producing a rather small quantity of pollen , and a rudimentary pistil ; other holly - trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers ...
... male flowers , which have four stamens producing a rather small quantity of pollen , and a rudimentary pistil ; other holly - trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers ...
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