Quiescence and Reviviscence in Nematodes, with special reference to Tylenchus tritici and Tylenchus dipsaci.

During the past few years the writer has had an opportunity of making observations on the quiescent larvæ of Tylenchus tritici occurring in galls from ears of wheat, and of examining certain resting stages of Tylenchus dipsaci from diseased Narcissus bulbs.