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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145 페이지
... CHARACTERS MORE VARIABLE THAN GENERIC CHARACTERS . The principle discussed under the last heading may be applied to our present subject . It is notorious that spe- cific characters are more variable than generic . To ex- plain by a ...
... CHARACTERS MORE VARIABLE THAN GENERIC CHARACTERS . The principle discussed under the last heading may be applied to our present subject . It is notorious that spe- cific characters are more variable than generic . To ex- plain by a ...
146 페이지
... characters ; and these char- acters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selec- tion will have modified several distinct species , fitted to more or less widely ...
... characters ; and these char- acters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selec- tion will have modified several distinct species , fitted to more or less widely ...
433 페이지
... characters , even when none are impor- tant , alone explains the aphorism enunciated by Linnæus , namely , that the characters do not give the genus , but the genus gives the character ; for this seems founded on the appreciation of ...
... characters , even when none are impor- tant , alone explains the aphorism enunciated by Linnæus , namely , that the characters do not give the genus , but the genus gives the character ; for this seems founded on the appreciation of ...
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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