A New Theory of Organic EvolutionW. Blackwood and Sons, 1903 - 174 páginas |
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Página 19
... live . " 1 The sterility of some hybrids was not to be anticipated , for if the life - forces of two races are so closely allied that they can combine to produce a hybrid , might it not be expected that the life - forces of the hy ...
... live . " 1 The sterility of some hybrids was not to be anticipated , for if the life - forces of two races are so closely allied that they can combine to produce a hybrid , might it not be expected that the life - forces of the hy ...
Página 20
... live together on the same mountain - side ; neither do grouse and ptarmigan ; and it may be doubtful whether cattle of different breeds would mate together if free to choose . We certainly know that a strong feel- ing of aversion exists ...
... live together on the same mountain - side ; neither do grouse and ptarmigan ; and it may be doubtful whether cattle of different breeds would mate together if free to choose . We certainly know that a strong feel- ing of aversion exists ...
Página 28
... lives in an alien country , like the Jews or Gipsies , and intermarries only with its own people , remains pure ; but usually a minority becomes absorbed in the majority , or otherwise disappears , although examples of atavism will ...
... lives in an alien country , like the Jews or Gipsies , and intermarries only with its own people , remains pure ; but usually a minority becomes absorbed in the majority , or otherwise disappears , although examples of atavism will ...
Página 32
... live in the same or adjacent villages , remain apart , each retaining its own distinctive characteristics and habits mental and physical.2 Why the Chinese and other ancient civilisations , after having developed a full expression of ...
... live in the same or adjacent villages , remain apart , each retaining its own distinctive characteristics and habits mental and physical.2 Why the Chinese and other ancient civilisations , after having developed a full expression of ...
Página 78
... live . " The same results follow the cross - breeding of dogs . The lurcher is a cross between the greyhound and the collie , and combines in high degree the swiftness and keenness of vision of the greyhound and the intelligence and ...
... live . " The same results follow the cross - breeding of dogs . The lurcher is a cross between the greyhound and the collie , and combines in high degree the swiftness and keenness of vision of the greyhound and the intelligence and ...
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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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