A New Theory of Organic EvolutionW. Blackwood and Sons, 1903 - 174 páginas |
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Página 14
... experience of skilful breeders of all domestic animals ; but we shall deal only with the breeding of cattle , because the various races are closely allied , their habits and appearance are generally known , their mating is closely ...
... experience of skilful breeders of all domestic animals ; but we shall deal only with the breeding of cattle , because the various races are closely allied , their habits and appearance are generally known , their mating is closely ...
Página 15
... experience has been that the longer selective breeding is pursued , the more firmly established becomes the family expression of a herd , and the more forcibly do the parents stamp the family like- ness on their progeny . But with ...
... experience has been that the longer selective breeding is pursued , the more firmly established becomes the family expression of a herd , and the more forcibly do the parents stamp the family like- ness on their progeny . But with ...
Página 17
... experience , therefore , con- firm our abstract deductions- That the development of a type cannot exceed a full expression of the energy of its life - forces ; and That without modification of a Specific life - force there can be no ...
... experience , therefore , con- firm our abstract deductions- That the development of a type cannot exceed a full expression of the energy of its life - forces ; and That without modification of a Specific life - force there can be no ...
Página 19
... experience emphatically nega- tives the inference , even in the case of races so closely allied as our breeds of domestic cattle . In this elimination of mongrel stock may we not recognise Nature's hostility to a new type ? Attempts ...
... experience emphatically nega- tives the inference , even in the case of races so closely allied as our breeds of domestic cattle . In this elimination of mongrel stock may we not recognise Nature's hostility to a new type ? Attempts ...
Página 26
... experience in breeding cattle would , under corresponding conditions , be repeated in the human race , and in that case it would follow- That the species Homo sapiens is not de- scended from a single pair of ancestors , but is composed ...
... experience in breeding cattle would , under corresponding conditions , be repeated in the human race , and in that case it would follow- That the species Homo sapiens is not de- scended from a single pair of ancestors , but is composed ...
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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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