On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeThis is the 'second edition' of Darwin's Origin of Species. |
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Page 14
... effects of intercrossing , that only a single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , 14 CHAP . I. VARIATION.
... effects of intercrossing , that only a single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , 14 CHAP . I. VARIATION.
Page 20
... occasional crosses , if aided by the careful selection of those individual mongrels , which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can ...
... occasional crosses , if aided by the careful selection of those individual mongrels , which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can ...
Page 27
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken together , I can feel no doubt that all our domestic breeds have ...
... occasionally appearing in all the breeds , both when kept pure and when crossed ; the mongrel offspring being perfectly fertile ; -from these several reasons , taken together , I can feel no doubt that all our domestic breeds have ...
Page 36
... occasional preservation of the best indi- viduals , whether or not sufficiently distinct to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become 36 CHAP . I. UNCONSCIOUS ...
... occasional preservation of the best indi- viduals , whether or not sufficiently distinct to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become 36 CHAP . I. UNCONSCIOUS ...
Page 41
... occasionally , the chance of their appearance will be much increased by a large number of individuals being kept ; and hence this comes to be of the highest importance to success . On this principle Marshall has remarked , with respect ...
... occasionally , the chance of their appearance will be much increased by a large number of individuals being kept ; and hence this comes to be of the highest importance to success . On this principle Marshall has remarked , with respect ...
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Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely