On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 7
... favourable to Man's power of Selection 19 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 any ...
... favourable to Man's power of Selection 19 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 any ...
Page 8
... favourable and unfavourable to Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action- Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of ...
... favourable and unfavourable to Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action- Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of ...
Page 15
... favourable to variation . In the next chapter the Struggle for Existence amongst all organic beings throughout the world , which inevi- tably 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 Existence amongst all organic beings throughout the world , which inevi- tably follows from the high geometrical ratio of their increase , will be treated of . This is the ...
Page 19
... favourable to Man's Power of Selection . WHEN We look to 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 generally differ more ...
... favourable to Man's Power of Selection . WHEN We look to 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 generally differ more ...
Page 36
... 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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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely