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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371 페이지
... species come in slowly and successively ; how species of different classes do not necessarily change together , or at ... Groups of species increase in numbers slowly , and endure for unequal periods of time ; for the process of modifica ...
... species come in slowly and successively ; how species of different classes do not necessarily change together , or at ... Groups of species increase in numbers slowly , and endure for unequal periods of time ; for the process of modifica ...
435 페이지
... groups of species , such as orders , suborders , fam- ilies , subfamilies , and genera , they seem to be , at least at present , almost arbitrary . Several of the best botanists , such as Mr. Bentham and others , have strongly insisted ...
... groups of species , such as orders , suborders , fam- ilies , subfamilies , and genera , they seem to be , at least at present , almost arbitrary . Several of the best botanists , such as Mr. Bentham and others , have strongly insisted ...
491 페이지
... species have come on the stage slowly and at succes- sive intervals ; and the amount of change , after equal intervals of time , is widely different in different groups . The extinction of species and of whole groups of species , which ...
... species have come on the stage slowly and at succes- sive intervals ; and the amount of change , after equal intervals of time , is widely different in different groups . The extinction of species and of whole groups of species , which ...
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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