On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 36
... male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of domestic pigeons at some , yet quite insufficient , length ; because when ...
... male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of domestic pigeons at some , yet quite insufficient , length ; because when ...
Page 81
... same climate . He does not allow the most vigorous 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 NATURAL SELECTION 81.
... same climate . He does not allow the most vigorous 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 NATURAL SELECTION 81.
Page 83
... male stag - beetles sometimes bear wounds from the huge mandibles of other males . The war is , perhaps , severest between the males of polygamous animals , and these seem oftenest provided with special weapons . The males of ...
... male stag - beetles sometimes bear wounds from the huge mandibles of other males . The war is , perhaps , severest between the males of polygamous animals , and these seem oftenest provided with special weapons . The males of ...
Page 83
... males alone , or by the males and females ; but I have not space here to enter on this subject . Thus it is , as I believe , that when the males and females of any animal have the same general habits of life , but differ in structure ...
... males alone , or by the males and females ; but I have not space here to enter on this subject . Thus it is , as I believe , that when the males and females of any animal have the same general habits of life , but differ in structure ...
Page 85
... males , those which are best fitted for their places in nature , will leave most progeny . But in many cases , victory depends not on general vigour , but on having special weapons , confined to the male sex . A hornless stag or ...
... males , those which are best fitted for their places in nature , will leave most progeny . But in many cases , victory depends not on general vigour , but on having special weapons , confined to the male sex . A hornless stag or ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely