6go 



Dysentery 



in which there were no ameba. The lapse of time and the 

 thoroughness of investigation that came with it solved both 

 of the difficulties, for it was shown that there were several 

 varieties of intestinal amebas and also that there was a 

 bacillary as well as an amebic form of dysentery. 



Celli and Fiocca* were the first to study the amebas sys- 

 tematically and to cultivate them upon artificial media. 

 Councilman and Lafleur pointed out that there were two 

 varieties of amebas which they called Amoeba coli and Amoeba 

 dysenteriae. The former was supposed to be a harmless 

 commensal, the latter a pathogenic organism and the cause 

 of dysentery. As, however, Losch had called the organism 



Fig. 231. Amoeba coli in intestinal mucus, with blood-corpuscles and 

 bacteria (Losch). 



found in dysentery the Amoeba coli, Stiles declared the nomen- 

 clature faulty, and pointed out that Amoeba coli, variety dys- 

 enteriae, must be the name of the pathogenic form. Schau- 

 dinn f reviewed the subject and grouped all of the intestinal 

 amebas under the following: 



I. Chlamydophrys stercorea (Cienkowsky). 



II. Amoeba coli rhizopodia. 



1. Entamoeba coli (Losch) (Schaudinn). 



2. Entamoeba histolytica (Schaudinn). 

 To these has been since added in 1907: 



Entamoeba tetragena (Viereck). 



* "Centralbl. f. Bakt. u. Parasitenk.," 1894, xv, 470. 



t "Arbeiten aus d. Kaiserl. Gesundheitsamt.," 1903, xix, No. 3. 



