On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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v 페이지
... favourable to Man's power of Selection --- 7-47 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 --- 7-47 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 ...
4 페이지
... favourable to variation . In the next chapter the Struggle for Ex- istence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be treated of . This is the ...
... favourable to variation . In the next chapter the Struggle for Ex- istence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be treated of . This is the ...
7 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 ani- mals , 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 ani- mals , one of the first points which strikes us is , that they ...
30 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 affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely