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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1 페이지
... facts in the distribution of the organic beings inhabiting South America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume ...
... facts in the distribution of the organic beings inhabiting South America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume ...
2 페이지
... facts in illustration , but which , I hope , in most cases will suffice . No one can feel more sensible than I do of the necessity of hereafter publishing in detail all the facts , with references , on which my conclusions have been ...
... facts in illustration , but which , I hope , in most cases will suffice . No one can feel more sensible than I do of the necessity of hereafter publishing in detail all the facts , with references , on which my conclusions have been ...
475 페이지
... facts in Morphology become intelligible- whether we look to the same pattern displayed by the different species of the same class in their homologous organs , to whatever purpose applied ; or to the serial and lateral homologies in each ...
... facts in Morphology become intelligible- whether we look to the same pattern displayed by the different species of the same class in their homologous organs , to whatever purpose applied ; or to the serial and lateral homologies in each ...
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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