An Introduction to Entomology

An Introduction to Entomology : Vol. IV (of 4)

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"[...]often divide and subdivide, and terminate in numerous ramifications that connect every part of the body with the sensorium commune. A pair of nerves is the most usual number that proceeds from each side of a ganglion[100]; but this is by no means constant, since in the louse, the hive-bee, and several other insects, only a single nerve thus proceeds[101]; and in the larva of Ephemerae, while two pairs issue from the six first ganglions, only a single one is emitted by the five last[102]. In the spinal marrow of the rhinoceros-beetle, both larva and imago, the nerves consist of simple filaments which diverge like rays in all directions[103]: the same circumstance distinguishes the cheese-maggot, only some of the nerves appear to branch at the end[104]: in the louse, the last ganglion sends forth posteriorly three pairs of nerves which render to the abdomen[105]. Sometimes, though rarely, nerves[...].""
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Product details

  • Paperback | 642 pages
  • 152.4 x 228.6 x 30.99mm | 893.57g
  • United States
  • English
  • black & white illustrations
  • 1507669933
  • 9781507669938