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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... intermediate between two other forms occur , they are much rarer numerically than the forms which they con- nect . Now , if we may trust these facts and inferences , and conclude that varieties linking two other varieties to- gether ...
... intermediate between two other forms occur , they are much rarer numerically than the forms which they con- nect . Now , if we may trust these facts and inferences , and conclude that varieties linking two other varieties to- gether ...
164 ÆäÀÌÁö
... intermediate zones in lesser numbers than the varieties which they tend to connect . From this cause alone the intermediate varieties will be liable to accidental extermination ; and during the process of further modification through ...
... intermediate zones in lesser numbers than the varieties which they tend to connect . From this cause alone the intermediate varieties will be liable to accidental extermination ; and during the process of further modification through ...
361 ÆäÀÌÁö
... intermediate in general character between that which preceded and that which succeeded it . Thus the species which lived at the sixth great stage of descent in the diagram are the modified offspring of those which lived at the fifth ...
... intermediate in general character between that which preceded and that which succeeded it . Thus the species which lived at the sixth great stage of descent in the diagram are the modified offspring of those which lived at the fifth ...
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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