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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34 페이지
... FAVORABLE TO MAN'S POWER OF SELEC TION . I will now say a few words on the circumstances , favor- able or the reverse , to man's power of selection . A high degree of variability is obviously favorable , as freely giving the materials ...
... FAVORABLE TO MAN'S POWER OF SELEC TION . I will now say a few words on the circumstances , favor- able or the reverse , to man's power of selection . A high degree of variability is obviously favorable , as freely giving the materials ...
94 페이지
... FAVORABLE FOR THE PRODUCTION NEW FORMS THROUGH NATURAL SELECTION . OF This is an extremely intricate subject . A great amount of variability , under which term individual differences are always included , will evidently be favorable . A ...
... FAVORABLE FOR THE PRODUCTION NEW FORMS THROUGH NATURAL SELECTION . OF This is an extremely intricate subject . A great amount of variability , under which term individual differences are always included , will evidently be favorable . A ...
97 페이지
... favorable for the production of new species . But we may thus deceive ourselves , for to ascertain whether a small isolated area , or a large open area like a continent , has been most favorable for the pro- duction of new organic forms ...
... favorable for the production of new species . But we may thus deceive ourselves , for to ascertain whether a small isolated area , or a large open area like a continent , has been most favorable for the pro- duction of new organic forms ...
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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