1921
Volume 8, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Summary

  • 1)  The percentages of organic matter in shells of laboratory-raised and in those of their field counterparts were determined by both individual and bulk methods.
  • 2)  Simple chemical analyses indicated considerable nitrogen and some amino acids present in the organic material of the shells.
  • 3)  Shells of laboratory-raised snails contained only about one-half as much organic matter as those of field snails.
  • 4)  It is thought that this indicates a possible insufficiency of nitrogenous food in the laboratory culture dishes. This may be due in part to an excess eating of refined cellulose.

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