The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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vi 페이지
... parent - Explains the grouping of all organic beings - Advance in organisation - Low forms preserved - Convergence of Character- Indefinite multiplication of species - Summary 57 CHAPTER V. LAWS OF VARIATION . Effects of changed ...
... parent - Explains the grouping of all organic beings - Advance in organisation - Low forms preserved - Convergence of Character- Indefinite multiplication of species - Summary 57 CHAPTER V. LAWS OF VARIATION . Effects of changed ...
xxi 페이지
... parent - form . In June , 1859 , Professor Huxley gave a lecture before the Royal Institution on the ' Persistent Types of Animal Life . ' Referring to such cases , he remarks , " It is difficult to comprehend the meaning of such facts ...
... parent - form . In June , 1859 , Professor Huxley gave a lecture before the Royal Institution on the ' Persistent Types of Animal Life . ' Referring to such cases , he remarks , " It is difficult to comprehend the meaning of such facts ...
5 페이지
... parent species had been exposed under nature . There is , also , some probability in the view propounded by Andrew Knight , that this variability may be partly connected with excess of food . It seems clear that organic beings must be ...
... parent species had been exposed under nature . There is , also , some probability in the view propounded by Andrew Knight , that this variability may be partly connected with excess of food . It seems clear that organic beings must be ...
6 페이지
... parent or from some more remote ancestor . Even strongly - marked differences occa- sionally appear in the young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of ...
... parent or from some more remote ancestor . Even strongly - marked differences occa- sionally appear in the young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of ...
7 페이지
... parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily affected ; so will some animals ...
... parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily affected ; so will some animals ...
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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 fact 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 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