The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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144 페이지
... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily developed part or organ has been so great and long - continued ...
... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily developed part or organ has been so great and long - continued ...
235 페이지
... continued preservation of the indi- viduals of some extinct high - reaching ruminant , which had the longest necks , legs , etc. , and could browse a little above the average height , and the continued destruction of those which could ...
... continued preservation of the indi- viduals of some extinct high - reaching ruminant , which had the longest necks , legs , etc. , and could browse a little above the average height , and the continued destruction of those which could ...
248 페이지
... continued and compulsory habit ; but this is not true . No one would ever have thought of teaching , or probably could have taught , the tumbler - pigeon to tumble - an action which , as I have witnessed , is performed by young birds ...
... continued and compulsory habit ; but this is not true . No one would ever have thought of teaching , or probably could have taught , the tumbler - pigeon to tumble - an action which , as I have witnessed , is performed by young birds ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young