The Shipley Collection of Scientific Papers Volume 240

The Shipley Collection of Scientific Papers Volume 240

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...tin boxes, one and one-quarter inches high. One or two grubs were kept in each box, the larger grubs being kept in larger boxes. These boxes were conveniently kept in piles and tiers, and were opened and the contents examined regularly at intervals of several days to a week or more. Pupa-were examined almost daily. To prevent rust boxes were first lined with a thin coating of paraffin. Moisture was regulated not by adding water to the box, which experience proved was dangerous, but by using sifted earth of the right dampness to begin with, and renewing the earth when it became dry or sour. Food was supplied by adding a kernel of corn to each box. A new kernel was never added until the old one had been entirely consumed, germinating roots and all, as it was found that greater danger came from over feeding than from under feeding. Too much food in a box always led to an accumulation of mites (Tyroylyphus sp.?), which would attack and often sicken the grub, finally causing its death unless the mites were carefully brushed off and fresh earth supplied. In absence of corn, a small section of cane could be fed; but cane quickly soured and nearly always gave rise to mites, so that use of corn was preferable. Movements of the grub in a can have a tendency to pack the earth, so that by careful manipulation of a knife blade the top earth may be removed and the grub's tunnel exposed. A tunnel averages three to four times the length of the grub's body; and when one part of the tunnel is opened the grub rushes to the other extremity, so that there is small danger of injury. The grub may thus be viewed without disturbing it to any great extent. When a grub is first added to a can, the latter is filled even full with sifted (not too fine) moist earth, ..show more

Product details

  • Paperback | 368 pages
  • 189 x 246 x 19mm | 658g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123697784X
  • 9781236977847