On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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27 페이지
... existing domesticated productions have varied . In the case of most of our anciently domesticated animals and plants , it is not possible to come to any definite conclusion , whether they have descended from one or several wild species ...
... existing domesticated productions have varied . In the case of most of our anciently domesticated animals and plants , it is not possible to come to any definite conclusion , whether they have descended from one or several wild species ...
34 페이지
... existing species is thus coloured and marked , so that in each separate breed there might be a tendency to revert to the very same colours and markings . Or , secondly , that each breed , even the purest , has within a dozen , or at ...
... existing species is thus coloured and marked , so that in each separate breed there might be a tendency to revert to the very same colours and markings . Or , secondly , that each breed , even the purest , has within a dozen , or at ...
41 페이지
... existing in the country . But , for our purpose , a kind of Selection , which may be called Unconscious , and which results from every one trying to possess and breed from the best individual animals , is more important . Thus , a man ...
... existing in the country . But , for our purpose , a kind of Selection , which may be called Unconscious , and which results from every one trying to possess and breed from the best individual animals , is more important . Thus , a man ...
42 페이지
... existing in Britain , India , and Persia , we can , I think , clearly trace the stages through which they have insensibly passed , and come to differ so greatly from the rock - pigeon . 66 Youatt gives an excellent illustration of the ...
... existing in Britain , India , and Persia , we can , I think , clearly trace the stages through which they have insensibly passed , and come to differ so greatly from the rock - pigeon . 66 Youatt gives an excellent illustration of the ...
100 페이지
... existing species ; and if some of these many species become modified and improved , others will have to be improved in a corresponding degree or they will be exterminated . Each new form , also , as soon as it has been much improved ...
... existing species ; and if some of these many species become modified and improved , others will have to be improved in a corresponding degree or they will be exterminated . Each new form , also , as soon as it has been much improved ...
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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