The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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1 페이지
... facts in the distribution of the organic beings inhabit- ing 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 inhabit- ing 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 ...
7 페이지
... fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity ... facts clearly show how eminently susceptible the reproduc- tive system is to very slight changes in the surrounding ...
... fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity ... facts clearly show how eminently susceptible the reproduc- tive system is to very slight changes in the surrounding ...
9 페이지
... facts collected by Heusinger , it appears that white sheep and pigs are injured by certain plants , whilst dark- coloured individuals escape : Professor Wyman has recently com- municated to me a good illustration of this fact ; on ...
... facts collected by Heusinger , it appears that white sheep and pigs are injured by certain plants , whilst dark- coloured individuals escape : Professor Wyman has recently com- municated to me a good illustration of this fact ; on ...
10 페이지
... fact of some importance to us , that peculiarities appearing in the males of our domestic breeds are often ... facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity ...
... fact of some importance to us , that peculiarities appearing in the males of our domestic breeds are often ... facts make me believe that the rule has a wider extension , and that , when there is no apparent reason why a peculiarity ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young