The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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115 페이지
... groups ; and we can understand this fact , for the extinct species lived at various remote epochs when the branching lines of descent had diverged less . I see no reason to limit the process of modification , as now explained , to the ...
... groups ; and we can understand this fact , for the extinct species lived at various remote epochs when the branching lines of descent had diverged less . I see no reason to limit the process of modification , as now explained , to the ...
358 페이지
... groups , yet that at this ancient period the groups were not so distinctly separated from each other as they now are . Some writers have objected to any extinct species , or group of species , being considered as intermediate between ...
... groups , yet that at this ancient period the groups were not so distinctly separated from each other as they now are . Some writers have objected to any extinct species , or group of species , being considered as intermediate between ...
428 페이지
... groups subordinate to groups - Natural system - Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or ...
... groups subordinate to groups - Natural system - Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or ...
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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 Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals 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 trees variability variations varieties vary whole widely different wings young