1. The experiment has already been described elsewhere (Parasitology, 1933, 25, 436).
2. Cysts seldom survive for so long. The culture was made in the course of experiments to determine the viability of this strain, which has been fully described in earlier papers (Parasitology, 1936, 28, 541, and 1938, 30, 195).
3. Described in earlier papers: see especially Parasitology, 1928, 20, 365.
4. In an earlier paper, dealing with Dientamoeba fragilis (see Parasitology, 1940, 32, 417)