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Bulletin of the Illinois State Laboratory of Natural History Volume 1

Bulletin of the Illinois State Laboratory of Natural History Volume 1


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 Excerpt: ...for the year is thirty-six per cent. On the second line we notice an inverse variation. Commencing with a ratio of ninety-four per cent, of injurious elements eaten in February (if we include the larva of Bibio in these), the record runs down to seven per cent, in September, the general average for the year being forty-three per cent. This comparison, however, is merely a quantitative one. Injurious or beneficial elements are balanced against each other according to their bulk and not their quality. A quart of caterpillars counts as the equivalent of a quart of blackberries, and, on the other hand, as the equivalent, also, of a quart of predaceous beetles. It is evident, therefore, that we cannot get at any close estimate of the economical values of this species in this indiscriminate way. A nearer.approximation to the truth may be made by critically comparing the general averages for the year found in the vertical column at the right of the table. Here we have the following totals of injurious and beneficial species: -Of the first, caterpillars, seventeen parts (including eight parts cut-worms); Bibio larva?, fifteen parts; leaf-chafers, three parts; wire-worms, two parts; Bnout-beetles, two parts; crickets and grasshoppers, four parts. Of the second, predaceous beetles, six parts; predaceous bugs, three parts; garden fruits, twenty-four parts. Now, the opinions of entomologists would probably be found to differ somewhat widely on the question of the relative values of these various elements, and each must form his own opinion from the data given. My own judgment is that, taking into consideration only the immediate present effect of the robin upon the fruits and insects of the state, ignoring for the moment the important secondary disturbances likely to ar..


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Product Details
  • ISBN-13: 9781130263886
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 186
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1130263886
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 340 gr


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