The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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xxi 페이지
... facts as these , if we suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; and it is well to ...
... facts as these , if we suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the surface of the globe at long intervals by a distinct act of creative power ; and it is well to ...
1 페이지
... facts in the distribution of the organic beings in- habiting 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 in- habiting 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 ...
6 페이지
... facts as the complex and extraordinary out - growths which variably follow from the insertion of a minute drop of ... fact of this system being extremely sensitive to any change in the conditions , and partly from the similarity , as. 6 ...
... facts as the complex and extraordinary out - growths which variably follow from the insertion of a minute drop of ... fact of this system being extremely sensitive to any change in the conditions , and partly from the similarity , as. 6 ...
9 페이지
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. From facts collected by Heusinger , it ... fact ; on asking some farmers in Virginia how it was that all their pigs were black , they informed him that the ...
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. From facts collected by Heusinger , it ... fact ; on asking some farmers in Virginia how it was that all their pigs were black , they informed him that the ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young