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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111 페이지
... number of modified descendants will not be increased ; although the amount ... greater in amount , to convert these three forms into doubtful or at least ... greater number of generations ( as shown in the diagram in a con- densed and ...
... number of modified descendants will not be increased ; although the amount ... greater in amount , to convert these three forms into doubtful or at least ... greater number of generations ( as shown in the diagram in a con- densed and ...
162 페이지
... numbers than the forms which they connect , then we can understand why intermediate ... greater chance of being exterminated than one existing in large numbers ... number of well- marked varieties than do the rarer species . I may illus ...
... numbers than the forms which they connect , then we can understand why intermediate ... greater chance of being exterminated than one existing in large numbers ... number of well- marked varieties than do the rarer species . I may illus ...
486 페이지
... larger genera , which afford the greater number of varieties or incipient species , retain to a certain degree the character of varieties ; for they differ from each other by a less amount of difference than do the species of smaller ...
... larger genera , which afford the greater number of varieties or incipient species , retain to a certain degree the character of varieties ; for they differ from each other by a less amount of difference than do the species of smaller ...
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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