 | 1897 - Страниц: 490
...enunciated the proposition that favourable variations would tend to be preserved, and unfavourable ones to be destroyed, and that the result of this...subject has attained a much wider scope, has acquired increased importance, and has formed the basis of many ingenious speculations and hypotheses. As variations,... | |
 | 1959 - Страниц: 1444
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| 1959 - Страниц: 1444
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 | Ainsworth Rand Spofford - 1895 - Страниц: 476
...observation of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved, and unfavorable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which... | |
 | George Boughton Curtiss - 1896 - Страниц: 910
...observations of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved and unfavorable ones to be destroyed. The result of this would be the formation of new species. Here, then, I had at last got a theory by... | |
 | Charles Dudley Warner - 1897 - Страниц: 494
...observation of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved, and unfavorable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which... | |
 | John Lord - 1902 - Страниц: 528
...least possible, that amid the struggle for existence which everywhere goes on in the animal world, favorable variations would tend to be preserved, and unfavorable ones to be destroyed. The result would be the formation of new species. It was not until June, 1842, however, that Darwin... | |
 | 1903 - Страниц: 820
...observation of the habits of animals and plants, it at once struck him that xinder these circumstances favorable variations would tend to be preserved, and unfavorable ones to be destroyed. "Here, then," said Darwin, "I had at last got a theory by which to work." Wallace, the co-author of... | |
 | Rossiter Johnson - 1905 - Страниц: 424
...observation of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be preserved, and unfavorable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which... | |
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; and being well prepared to appreciate the struggle for existence which everywhere goes on from longcontinued observation of the habits of animals and plants, it at once struck me that under these circumstances favorable variations would tend to be... 
