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 34
... principle of reversion to ancestral characters ( confined , as far as I have seen , to colour alone ) , if all the domestic breeds have descended from the rock - pigeon . But if we deny this , we must make one of the two following ...
... principle of reversion to ancestral characters ( confined , as far as I have seen , to colour alone ) , if all the domestic breeds have descended from the rock - pigeon . But if we deny this , we must make one of the two following ...
Page 38
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . In order fully to realise what they have ...
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . In order fully to realise what they have ...
Page 39
... principle would be so obvious as hardly to be worth notice ; but its importance consists in the great effect ... principles are followed by horticulturists ; but the variations are here often more abrupt . No one supposes that our ...
... principle would be so obvious as hardly to be worth notice ; but its importance consists in the great effect ... principles are followed by horticulturists ; but the variations are here often more abrupt . No one supposes that our ...
Page 40
... principle is a modern discovery . I could give several references to the full acknowledgment of the importance of the principle in works of high antiquity . In rude and barbarous periods of English history choice animals were often ...
... principle is a modern discovery . I could give several references to the full acknowledgment of the importance of the principle in works of high antiquity . In rude and barbarous periods of English history choice animals were often ...
Page 45
... principle , as I have called it , of unconscious selection will always tend , perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state ...
... principle , as I have called it , of unconscious selection will always tend , perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state ...
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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