The Origin of Species: By Means of Natural Selection Or the Preservation of Favoured Races in the Struggle for LifeCastle Books, 2004 - Всего страниц: 703 The instant best-seller and source of controversy of 1859, this classic has lost none of its appeal or importance. A reprint of the original edition, value priced with a new jacket. |
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Стр. 8
... vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated plants , such as wheat , still yield new varieties : our oldest do ...
... vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated plants , such as wheat , still yield new varieties : our oldest do ...
Стр. 66
... vary most . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well- worked ...
... vary most . Guided by theoretical considerations , I thought that some interesting results might be obtained in regard to the nature and relations of the species which vary most , by tabulating all the varieties in several well- worked ...
Стр. 141
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
... vary in large genera than in small genera ; and the varying species of the large genera present a greater number of varieties . We have , also , seen that the species , which are the commonest and the most widely diffused , vary more ...
Содержание
CHAPTER I | 5 |
Variability Individual differences Doubtful species Wide | 51 |
STRUGGLE FOR EXISTENCE | 75 |
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adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species divergence doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs Origin of Species paleozoic parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds slight South America stamens sterility structure successive supposed theory tion trees variability variations varieties vary whilst whole wings young