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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91 페이지
... shown by Gärtner , the influence of the foreign pollen . When the stamens of a flower suddenly spring toward the pistil , or slowly move one after the other toward it , the contrivance seems adapted solely to ensure self- fertilization ...
... shown by Gärtner , the influence of the foreign pollen . When the stamens of a flower suddenly spring toward the pistil , or slowly move one after the other toward it , the contrivance seems adapted solely to ensure self- fertilization ...
246 페이지
... shown that bees , instead of searching for pollen , will gladly use a very different substance , namely , oatmeal . Fear of any particular enemy is certainly an instinctive quality , as may be seen in nest- ling birds , though it is ...
... shown that bees , instead of searching for pollen , will gladly use a very different substance , namely , oatmeal . Fear of any particular enemy is certainly an instinctive quality , as may be seen in nest- ling birds , though it is ...
367 페이지
... shown in the most striking manner that most of the fossil mammals , buried there in such numbers , are re- lated to South American types . This relationship is even more clearly seen in the wonderful collection of fossil bones made by ...
... shown in the most striking manner that most of the fossil mammals , buried there in such numbers , are re- lated to South American types . This relationship is even more clearly seen in the wonderful collection of fossil bones made by ...
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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