The purpose of this paper was to study the distribution of phagocytic cells in the ton-gue of the rats. Two ml of 2.5%water soluしion of lithium carmine(L. C.)and 4%water solution of trypan blue(T. B.)were administered subcutaneously to the Wister-strain male rats daily for one week. Specimen for light microscopic observation was prepared in usual way. Numerous pha・ gocytic cells were seen ill the tongue of the rats. But the dyes were not found in the mucous epit-helial cell and endothelial cell of the capillary. Number of the phagocytic cell in T, B. injected group were significantly greater than tho3e in L. C. injected group. The increased cell due to ad・ ministration of T. B. was chiefly round cell, that was particularly conspicuous in the muscle layer of the root and the subepithelial connective tissue of the body of tongue. As to distribution of the phagocytic cells in the tongue, they were remarkable in the tip of tongue(p<0.05).