The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538ÆäÀÌÁö |
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... vary ; for these same authors practically rank those parts as important ( as some few naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ...
... vary ; for these same authors practically rank those parts as important ( as some few naturalists have honestly confessed ) which do not vary ; and , under this point of view , no instance will ever be found of an important part varying ...
50 ÆäÀÌÁö
... VARY MOST . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well - worked ...
... VARY MOST . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well - worked ...
106 ÆäÀÌÁö
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and most widely diffused , vary more than ...
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and most widely diffused , vary more than ...
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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 lamell©¡ larv©¡ 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