 | 1860 - 982 페이지
...obtaining of food, but the serving as prey to other animals, which determines the average cumbers of a species." — p. 68. " Climate plays an important...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 - 1864 - 472 페이지
...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... | |
 | John Laws Milton - 1864 - 668 페이지
...Again, Mr. Darwin says, " I estimated (chiefly from the greatly reduced numbers of nests in the spring) that the winter of 1854-55 destroyed four-fifths of...grounds, and this is a tremendous destruction when we consider that ten per cent, is an extraordinarily severe mortality from epidemics with man."* Yet all... | |
 | Charles Darwin - 1866 - 668 페이지
...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 - 1873 - 492 페이지
...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 페이지
...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... | |
 | T Warren O'Neill - 1880 - 482 페이지
...food may be now superabundant, it is not so at all seasons of each recurring year." Again he says : " Climate plays an important part in determining the...winter of 1854-55 destroyed four-fifths of the birds on my own grounds; and this is a tremendous destruction when we remember that ten per cent. is an extraordinarily... | |
 | Morgan George Watkins - 1883 - 250 페이지
...what havoc a severe winter makes amongst our garden friends. "I estimated that the winter of 1854-5 destroyed four-fifths of the birds in my own grounds,...destruction when we remember that ten per cent is an extraordinary severe mortality from epidemics with man* Our British birds are commonly weather-wise,... | |
 | Charles Darwin - 1884 - 494 페이지
...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 페이지
...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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Climate plays an important 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. 
