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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194 페이지
... reason leads us to admire with enthusiasm a multitude of inimitable con- trivances in nature , this same reason tells us , though we may easily err on both sides , that some other contrivances are less perfect . Can we consider the ...
... reason leads us to admire with enthusiasm a multitude of inimitable con- trivances in nature , this same reason tells us , though we may easily err on both sides , that some other contrivances are less perfect . Can we consider the ...
289 페이지
... reason why one tree will not take on another from differences in their rate of growth , in the hardness of their wood , in the period of the flow or nature of their sap , etc .; but in a multitude of cases we can assign no reason ...
... reason why one tree will not take on another from differences in their rate of growth , in the hardness of their wood , in the period of the flow or nature of their sap , etc .; but in a multitude of cases we can assign no reason ...
344 페이지
... reason to believe that organisms high in the scale , change more quickly than those that are low : though there are exceptions to this rule . The amount of organic change , as Pictet has remarked , is not the same in each successive so ...
... reason to believe that organisms high in the scale , change more quickly than those that are low : though there are exceptions to this rule . The amount of organic change , as Pictet has remarked , is not the same in each successive so ...
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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