ONE of the most prevalent and difficult tapeworms to control is the relatively large species Raillietina cesticillus (Molin). Although attempts to find suitable drugs to remove this and other species have been made repeatedly, no satisfactory anthelmintic has yet been found. Harwood and Guthrie (1940) who tried to remove experimentally produced infections of this worm used 223 substances and 27 mixtures. Although certain of these compounds were effective in the removal of this persistent parasite, they were too toxic to be recommended for general use.In recent studies upon the effects of fowl starvation on the tapeworm R. cesticillus, it was found that short periods of fasting caused large portions of the worm to be removed. Some of the physiological and parasitological problems involved in this study have been reported elsewhere (Reid, 1942). Starvation itself cannot be recommended as a means of treatment for tapeworms. However, since almost all treatment .