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 89
... kind preferring to pair together . Intercrossing plays a very important part in nature in keeping the individuals of the same species , or of the same variety , ' true and uniform in character . It will obviously thus act far more ...
... kind preferring to pair together . Intercrossing plays a very important part in nature in keeping the individuals of the same species , or of the same variety , ' true and uniform in character . It will obviously thus act far more ...
Page 183
... kind of wolf when young and without any training , as soon as it scented its prey , stand motionless like a statue , and then slowly crawl forward with a peculiar gait , and another kind of wolf rushing round , instead of at , a herd of ...
... kind of wolf when young and without any training , as soon as it scented its prey , stand motionless like a statue , and then slowly crawl forward with a peculiar gait , and another kind of wolf rushing round , instead of at , a herd of ...
Page 236
... kind- namely , that the crossing of forms only slightly different is favourable to the vigour and fertility of their offspring ; and that slight changes in the conditions of life are ap- parently favourable to the vigour and fertility ...
... kind- namely , that the crossing of forms only slightly different is favourable to the vigour and fertility of their offspring ; and that slight changes in the conditions of life are ap- parently favourable to the vigour and fertility ...
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence domestic doubt eggs embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flower formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder theory tion trees variability variations vary whole widely