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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89 페이지
... continued preservation of all the individuals which presented slight deviations of structure mutually favorable to each other . I am well aware that this doctrine of natural selection , exemplified in the above imaginary instances , is ...
... continued preservation of all the individuals which presented slight deviations of structure mutually favorable to each other . I am well aware that this doctrine of natural selection , exemplified in the above imaginary instances , is ...
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 ...
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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 domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest 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