Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . especially the Shiga bacillus, are present inlarge numbers. This bacillary dysentery is something entirely different fromthe amebic type of this disease. It is true that in certain cases of dysentery aswell as in normal individuals, amebae are found which are differentiated with1 See Fauntleroy and Hayden, U. S. Naval Med. Bull., 1915, IX, 81. it THE FECES. 135 great difficulty from the true amoeba coli. There seem to be two distinct types:one pathogenic, to which Councilman and Lafleu
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . especially the Shiga bacillus, are present inlarge numbers. This bacillary dysentery is something entirely different fromthe amebic type of this disease. It is true that in certain cases of dysentery aswell as in normal individuals, amebae are found which are differentiated with1 See Fauntleroy and Hayden, U. S. Naval Med. Bull., 1915, IX, 81. it THE FECES. 135 great difficulty from the true amoeba coli. There seem to be two distinct types:one pathogenic, to which Councilman and Lafleur give the name amoeba dysen-teriae, which Losch styles amoeba coli, and which Schaudinn designates end-amoeba histolytica; a second type, which is non-pathogenic, has been styled by thefirst writers amoeba coli Losch and by Schaudinn endamoeba coli. Viereck* hasdescribed a third form, which is pathogenic and is known as the endamoebatetragena. This form is now believed to be identical with the endamoeba histo-lytica. These forms have not been cultivated. The cultivated forms are non-pathogenic to man. 2. Fig. 24.—Amoeba coli. {Hem-meter.) One may sum up the points relative to the pathogenicity of the endamoebahistolytica as follows : (i) It appears in a form of dysentery which is anatom-ically characterized by peculiar ulcerations which are markedly different fromthe diphtheritic inflammatory processes of the bacillary dysentery. (2) Themore recent the case the more numerous are these parasites; (3) they are depos-ited in the dysenteric ulcers and tend to pass into the deeper tissue appearingas true tissue parasites; (4) they frequently deposit themselves in the liver caus-ing abscesses which contain these organisms in large numbers and practically noother infectious material; (5) by injection of amebae-containing feces into thelarge intestine of animals t3^ical amebic dysentery may be caused. It is to be * Beiheft z. Arch. f. Schiffs. -u. Tropenhyg., 1907, I, i. 2 See Craig
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