The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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356 페이지
... LIVING FORMS . Let us now look to the mutual affinities of extinct and living species . All fall into a few grand classes ; and this fact is at once explained on the principle of descent . The more ancient any form is , the more , as a ...
... LIVING FORMS . Let us now look to the mutual affinities of extinct and living species . All fall into a few grand classes ; and this fact is at once explained on the principle of descent . The more ancient any form is , the more , as a ...
358 페이지
... living forms or groups , the objection is probably valid . But in a natural classification many fossil species certainly stand between living species , and some extinct genera between living genera , even between genera belonging to ...
... living forms or groups , the objection is probably valid . But in a natural classification many fossil species certainly stand between living species , and some extinct genera between living genera , even between genera belonging to ...
367 페이지
... living marsupials of that continent . In South America , a similar relationship is manifest , even to an uneducated eye , in the gigantic pieces of armor , like those of the arma- dillo , found in several parts of La Plata ; and ...
... living marsupials of that continent . In South America , a similar relationship is manifest , even to an uneducated eye , in the gigantic pieces of armor , like those of the arma- dillo , found in several parts of La Plata ; and ...
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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