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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56개의 결과 중 1 - 5개
v 페이지
... favourable to Man's power of Selection .. 5 CHAPTER II . VARIATION UNDER NATURE . Variability — Individual differences - Doubtful species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in ...
... favourable to Man's power of Selection .. 5 CHAPTER II . VARIATION UNDER NATURE . Variability — Individual differences - Doubtful species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in ...
vi 페이지
... favourable and unfavourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection- Divergence of Character , related to the diversity of ...
... favourable and unfavourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection- Divergence of Character , related to the diversity of ...
3 페이지
... favourable to variation . In the next chapter the Struggle for Existence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be considered . This is the ...
... favourable to variation . In the next chapter the Struggle for Existence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be considered . This is the ...
5 페이지
... favourable to man's power of selection . Causes of Variability . WHEN we compare the individuals of the same variety or sub variety of our older cultivated plants and animals , one of the first points which strikes us is , that they ...
... favourable to man's power of selection . Causes of Variability . WHEN we compare the individuals of the same variety or sub variety of our older cultivated plants and animals , one of the first points which strikes us is , that they ...
19 페이지
... favourable circumstance for the production of distinct breeds , that male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of ...
... favourable circumstance for the production of distinct breeds , that male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of ...
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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