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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86 페이지
... insects ; but their visits do not in any way ben- efit the plant . Now , let us suppose that the juice or nectar was excreted from the inside of the flowers of a certain number of plants of any species . Insects in seeking the nectar ...
... insects ; but their visits do not in any way ben- efit the plant . Now , let us suppose that the juice or nectar was excreted from the inside of the flowers of a certain number of plants of any species . Insects in seeking the nectar ...
465 페이지
... insects ; ultimately they undergo a further transforma- tion , and finally emerge as the perfect beetle . Now , if an insect , undergoing transformations like those of the Sitaris , were to become the progenitor of a whole new class of ...
... insects ; ultimately they undergo a further transforma- tion , and finally emerge as the perfect beetle . Now , if an insect , undergoing transformations like those of the Sitaris , were to become the progenitor of a whole new class of ...
537 페이지
... insects homologous with branchiæ , 176 . rudimentary , in insects , 467 . Wolf , crossed with dog , 248 . of Falkland Isles , 414 . Wollaston , Mr. , on varieties of insects , 45 . on fossil varieties of shells in Madeira , 49 ...
... insects homologous with branchiæ , 176 . rudimentary , in insects , 467 . Wolf , crossed with dog , 248 . of Falkland Isles , 414 . Wollaston , Mr. , on varieties of insects , 45 . on fossil varieties of shells in Madeira , 49 ...
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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