Abstract
THE presence of a waxy layer at or near the outer surface of the epicuticle of insects is well known, and its function in limiting the permeability of the insect integument to water has been fully demonstrated by Wigglesworth1, Beament2 and others. Yonge3 has demonstrated the effect of the epicuticle of certain Crustacea in determining permeability to many substances, and Dennel4 has shown that phenolic tanning, as in insects, occurs in the hardening of the crustacean epicuticle. Dennel further suggests that tanning of the crustacean cuticle may, by facilitating impregnation with lipophilic substances, serve to limit permeability as well as to prevent abrasion.
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