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 81
... successive males display their gorgeous plumage and perform strange antics before the females , which , standing by as spectators , at last choose the most attractive partner . Those who have closely attended to birds in confinement ...
... successive males display their gorgeous plumage and perform strange antics before the females , which , standing by as spectators , at last choose the most attractive partner . Those who have closely attended to birds in confinement ...
Página 108
... successive generations . This case would be repre- sented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to alo In the same way , for instance , the English race - horse and English pointer ...
... successive generations . This case would be repre- sented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to alo In the same way , for instance , the English race - horse and English pointer ...
Página 109
... successive generations , will have come to differ largely , but perhaps unequally , from each other and from their common parent . If we suppose the amount of change between each horizontal line in our diagram to be excessively small ...
... successive generations , will have come to differ largely , but perhaps unequally , from each other and from their common parent . If we suppose the amount of change between each horizontal line in our diagram to be excessively small ...
Página 113
... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
Página 122
... successive genera- tions the size and weight of its body , its legs were used more , and its wings less , until they became incapable of flight . Kirby has remarked ( and I have observed the same fact ) that the anterior tarsi , or feet ...
... successive genera- tions the size and weight of its body , its legs were used more , and its wings less , until they became incapable of flight . Kirby has remarked ( and I have observed the same fact ) that the anterior tarsi , or feet ...
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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