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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94 페이지
... individual differences are always included , will evidently be favorable . A large num- ber of individuals , by giving a better chance within any given period for the appearance of profitable variations , will compensate for a lesser ...
... individual differences are always included , will evidently be favorable . A large num- ber of individuals , by giving a better chance within any given period for the appearance of profitable variations , will compensate for a lesser ...
210 페이지
... individuals , as with the race - horse and greyhound , or as with the game - cock , by breeding from the victorious birds . So under nature with the nascent giraffe , the individuals which were the highest browsers and were able during ...
... individuals , as with the race - horse and greyhound , or as with the game - cock , by breeding from the victorious birds . So under nature with the nascent giraffe , the individuals which were the highest browsers and were able during ...
484 페이지
... individuals are born than can possibly survive . A grain in the balance may determine which individuals shall live and which shall die -which variety or species shall increase in number , and which shall decrease ; or finally become ...
... individuals are born than can possibly survive . A grain in the balance may determine which individuals shall live and which shall die -which variety or species shall increase in number , and which shall decrease ; or finally become ...
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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