 | 1897 - 490 стор.
...variations within the limitations of a common species. Since Charles Darwin enunciated the proposition that favourable variations would tend to be preserved, and unfavourable ones to be destroyed, and that the result of this double action, by the accumulation of minute existing differences, would... | |
 | Charles Frederick Holder - 1891 - 374 стор.
...obtained the idea that in the struggle for existence between various forms, " favourable variations tend to be preserved, and unfavourable ones to be...destroyed. The result of this would be the formation of a new species." The idea must have come to him like a sudden flash of light that was, indeed, to illumine... | |
 | Benjamin Kidd - 1894 - 396 стор.
...to appreciate the struggle for existence which everywhere goes on, from long continued observation of the habits of animals and plants, it at once struck...ones to be destroyed. The result of this would be the foundation of a new species. Here, then, I had at last got a theory by which to work. " — The Life... | |
 | W. T. B. Martin, T. E. S. T. - 1894 - 536 стор.
...1838, being well prepared to appreciate the struggle for existence from long-continued observation of the habits of animals and plants, it at once struck me that under . . . circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed.... | |
 | James Hutchison Stirling - 1894 - 392 стор.
...naturally take place, and that was — by " the struggle for existence." It could be only so that " favourable variations would tend to be preserved, and unfavourable ones to be destroyed." " Here, then," says Mr. Darwin, " I had at last got a theory by which to work." In the struggle for... | |
 | Ainsworth Rand Spofford - 1895 - 476 стор.
...prepared to appreciate the struggle for existence which everywhere goes on from long-continued 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... | |
 | George Boughton Curtiss - 1896 - 910 стор.
...well prepared to appreciate the struggle for existence which everywhere goes on, from long continued 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... | |
 | John Theodore Merz - 1912 - 848 стор.
...to appreciate the struggle for existence which everywhere goes on, from long-continued observation of the habits of animals and plants, it at once struck...variations would tend to be preserved, and unfavourable ^ 3->. The ideas and reflections contained in this celebrated Malthas. essay, which has played a prominent... | |
 | Edward Clodd - 1897 - 284 стор.
...existence which everywhere goes on, from long-continued observations of the habits of plants and animals, it at once struck me that under these circumstances...would tend to be preserved, and unfavourable ones destroyed. The result of this would be the formation of new species. Shortly after his return he settled... | |
 | Charles Dudley Warner - 1897 - 494 стор.
...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 preserved, and unfavorable ones to be destroyed. The result of... | |
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I happened to read for amusement ' Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these... 
