That infections with Endameba histolytica are widespread among ex-service men in the North Central states and that they play an important rôle in various obscure intestinal complaints, neurasthenias and dermatitides is a view that has gained much credence within the last few years. To a considerable degree, interest has been stimulated recently by the work of Dr. T. D. Tuttle1 who, in 1925, reported the finding of Endameba histolytica in 100 of "less than 1,000 cases admitted to the general medical ward" of U. S. Veterans' Hospital No. 65 at Minneapolis over a period of twenty months. The ground for accepting this report as applicable to the group of ex-service men in this region as a whole had been cleared by the early postwar suggestions that a widespread increase of amebic dysentery in this country would probably result from the return of American soldiers from Europe. Moreover, the important