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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15 페이지
... doubt , from not knowing whether they are descended from one or several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier ...
... doubt , from not knowing whether they are descended from one or several parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier ...
74 페이지
... doubt ( remembering that many more individuals are born than can possibly survive ) that individuals having any ad vantage , however slight , over others , would have the best chance of surviving and procreating their kind ? On the ...
... doubt ( remembering that many more individuals are born than can possibly survive ) that individuals having any ad vantage , however slight , over others , would have the best chance of surviving and procreating their kind ? On the ...
249 페이지
... doubt that the love of man has become instinctive in the dog . All wolves , foxes , jackals and species of the cat genus , when kept tame , are most eager to attack poultry , sheep and pigs ; and this tendency has been found incur- able ...
... doubt that the love of man has become instinctive in the dog . All wolves , foxes , jackals and species of the cat genus , when kept tame , are most eager to attack poultry , sheep and pigs ; and this tendency has been found incur- able ...
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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