On the Origin of Species by Means of Natural SelectionJohn Murray, 1860 - 502페이지 |
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13 페이지
... species and varieties , if he makes due allowance for our profound ignorance in regard to the mutual relations of all ... species ranges widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet ...
... species and varieties , if he makes due allowance for our profound ignorance in regard to the mutual relations of all ... species ranges widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet ...
21 페이지
... animals and plants , and compare them with specics closely allied together , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races of the same species ...
... animals and plants , and compare them with specics closely allied together , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races of the same species ...
22 페이지
... species . If any marked distinction existed between domestic races and species , this source of doubt could not so ... allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not ...
... species . If any marked distinction existed between domestic races and species , this source of doubt could not so ... allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not ...
26 페이지
... allied to the carrier , but , instead of a very long beak , has a very short and very broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well ...
... allied to the carrier , but , instead of a very long beak , has a very short and very broad one . The pouter has a much elongated body , wings , and legs ; and its enormously developed crop , which it glories in inflating , may well ...
33 페이지
... species in a state of nature being lineal descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have been produced , either from one or from several allied species . Some little ...
... species in a state of nature being lineal descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have been produced , either from one or from several allied species . Some little ...
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accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic 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 intermediate larvæ less living look males mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation paleozoic perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely