The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life, Volume 1 |
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Page 10
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproductive system is to very slight changes in the surrounding conditions . Nothing is more easy than to tame an animal ...
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproductive system is to very slight changes in the surrounding conditions . Nothing is more easy than to tame an animal ...
Page 11
... animals under confinement , I may mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family , which seldom produce young ...
... animals under confinement , I may mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family , which seldom produce young ...
Page 12
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same ...
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same ...
Page 13
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
Page 18
... animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous ...
... animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous ...
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Common terms and phrases
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number individual differences inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young