| 1860 - 982 頁
...serving as prey to other animals, which determines the average cumbers of a species." — p. 68. " Climate plays an important part in determining the...and periodical seasons of extreme cold or drought, I believo to be the most effective of all checks. I estimated that tlie winter of 1854-55 destroyed four-fifths... | |
| Charles Darwin - 1861 - 470 頁
...of prey : even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...winter of 1854-55 destroyed four-fifths of the birds in my own grounds ; and this is a tremendous destruction, when we remember that ten per cent, is an... | |
| Charles Darwin - 1864 - 472 頁
...of prey : even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...extreme cold or drought, I believe to be the most cffective of all checks. I estimated that the winter of 1854—55 destroyed four-fifths of the birds... | |
| Charles Darwin - 1866 - 668 頁
...prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...and periodical seasons of extreme cold or drought seem to be the most effective of all checks. I estimated (chiefly from the greatly reduced numbers... | |
| Charles Darwin - 1870 - 468 頁
...of prey : even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...winter of 1854-55 destroyed four-fifths of the birds in my own grounds ; and this is a tremendous destruction, when we remember that ten per cent, is an... | |
| Charles Darwin - 1873 - 492 頁
...prey; for even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...numBe'rs of a species, and periodical seasons of extreme col(J,,or drought seem to be the most effective of all checks. I estimated "^chiefly from the greatly... | |
| Charles Darwin - 1875 - 504 頁
...prey ; for even the tiger in India most rarely dares to attack a young elephant protected by its dam. Climate plays an important part in determining the...and periodical seasons of extreme cold or drought seem to be the most effective of all checks. I estimated (chiefly from the greatly reduced numbers... | |
| Asa Gray - 1878 - 416 頁
...the serving as prey to other animals, which determines the average numbers of species."— (p. 68.) " Climate plays an important part in determining the...winter of 1854-'55 destroyed four-fifths of the birds in my own grounds; and this is a tremendous destruction, when we remember that ten per cent, is an... | |
| Charles Darwin - 1884 - 494 頁
...India most rarely iares to attack a young elephant protected by its dam. Climate plays an importaut part in determining the average numbers of a species,...and periodical seasons of extreme cold or drought seem to be the most effective of all checks. I estimated (chiefly from the greatly reduced numbers... | |
| Charles Darwin - 1884 - 396 頁
...by its dam. CLIMATE AS A CHECK TO INCREASE. Climate plays an important part in deter""'"' ' mining the average numbers of a species, and periodical seasons of extreme cold or drought seem to be the most effective of all checks. I estimated (chiefly from the greatly reduced numbers... | |
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