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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361 페이지
... affinities of the extinct forms of life to each other and to living forms , are explained in a satisfactory manner . And they are wholly inexplicable on any other view . On this same theory , it is evident that the fauna during any one ...
... affinities of the extinct forms of life to each other and to living forms , are explained in a satisfactory manner . And they are wholly inexplicable on any other view . On this same theory , it is evident that the fauna during any one ...
428 페이지
... Affinities , general , complex and radiating - Extinction separates and defines groups - Morphology , between members of the same class , between parts of the same individual - Embryology , laws of , explained by variations not ...
... Affinities , general , complex and radiating - Extinction separates and defines groups - Morphology , between members of the same class , between parts of the same individual - Embryology , laws of , explained by variations not ...
449 페이지
... affinities of all or- ganic beings , namely , their subordination in group under group . We use the element of ... affinities . We shall never , probably , disentangle the inextricable web of the affinities between the members of any one ...
... affinities of all or- ganic beings , namely , their subordination in group under group . We use the element of ... affinities . We shall never , probably , disentangle the inextricable web of the affinities between the members of any one ...
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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