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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219 페이지
... points of horn . There is , therefore , noth- ing improbable in supposing that some early Cetacean form was provided with similar points of horn on the palate , but rather more regularly placed , and which , like the knobs on the beak ...
... points of horn . There is , therefore , noth- ing improbable in supposing that some early Cetacean form was provided with similar points of horn on the palate , but rather more regularly placed , and which , like the knobs on the beak ...
247 페이지
... point and even back other dogs the very first time that they are taken out ; retrieving is certainly in some degree ... points to aid his master , than the white butterfly knows why she lays her eggs on the leaf of the cabbage - I ...
... point and even back other dogs the very first time that they are taken out ; retrieving is certainly in some degree ... points to aid his master , than the white butterfly knows why she lays her eggs on the leaf of the cabbage - I ...
379 페이지
... points , nor do I for a moment pretend that any explanation could be offered of many instances . But , after some preliminary remarks , I will discuss a few of the most striking classes of facts , namely , the existence of the same ...
... points , nor do I for a moment pretend that any explanation could be offered of many instances . But , after some preliminary remarks , I will discuss a few of the most striking classes of facts , namely , the existence of the same ...
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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