A New Theory of Organic EvolutionW. Blackwood and Sons, 1903 - 174 páginas |
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Página 87
... wild and domestic animals , assuming both to be of the same species , or between the same plant growing wild and under cultivation , are obviously not the effects of the struggle for existence , but of protection from its effects . In ...
... wild and domestic animals , assuming both to be of the same species , or between the same plant growing wild and under cultivation , are obviously not the effects of the struggle for existence , but of protection from its effects . In ...
Página 108
... wild species . But , as Darwin points out , the differences among domestic animals of the same race , and espe- cially those that arise under what is called selective breeding , " are much greater than among wild species . 66 When ...
... wild species . But , as Darwin points out , the differences among domestic animals of the same race , and espe- cially those that arise under what is called selective breeding , " are much greater than among wild species . 66 When ...
Página 109
... wild beasts neither carefully se- lected for breeding , nor reared under excep- tionally favourable conditions , show less divergence from an average type than pro- tected domestic animals . The greater differences among domestic than ...
... wild beasts neither carefully se- lected for breeding , nor reared under excep- tionally favourable conditions , show less divergence from an average type than pro- tected domestic animals . The greater differences among domestic than ...
Página 110
... wild species , and the origin of our domestic animals is en- veloped in mystery . For this and other reasons Domesticity demands a separate chapter . Accidental ( ? Spontaneous ) Variation . Individuals sometimes appear so different ...
... wild species , and the origin of our domestic animals is en- veloped in mystery . For this and other reasons Domesticity demands a separate chapter . Accidental ( ? Spontaneous ) Variation . Individuals sometimes appear so different ...
Página 123
... wild species from which he holds they came , and especially among the numerous breeds of domestic pigeons , which , he asserts , are all descended from the rock - pigeon . " I am fully convinced , " he says , " that the common opinion ...
... wild species from which he holds they came , and especially among the numerous breeds of domestic pigeons , which , he asserts , are all descended from the rock - pigeon . " I am fully convinced , " he says , " that the common opinion ...
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According to Darwin accumulation of beneficial ADAM BEDE antecessor appeared Author beneficial differences Blackwood breeder cattle cessive CHAPTER Cheap Edition Cheaper Church of Scotland CLASSICS FOR ENGLISH cloth colour common-sense conclusions conditions of existence Crown 8vo Darwin Darwinian Demy 8vo disuse domestic animals embryo ence evidence evolution evolved expression of type Fcap force French morocco genera George Eliot germ-cell germ-plasm gilt top growth habits History hybrids hypothesis J. G. Lockhart Jacquard loom JAMES JOHN Lectures less highly specialised limp LL.D loom mammal Maps modification natural selection numerous Illustrations OLIPHANT organisation organs Origin of Species paper cover People's Edition phenomena Philosophy Photogravure physique plant Poems Portrait Post 8vo Prof progeny rock-pigeon Romance royal 8vo Scottish Second Edition Second Impression secondary causes seed selective breeding Specific life-force specific variation struggle for existence successive types successor theory Third Edition tion University of Edinburgh vols whale wild species WILLIAM
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