OF THE ALIMENTARY TRACT 95 



podia. However, it is not uncommonly seen, in favor- 

 able specimens of stool or in culture material, when 

 these differences from Endarnoeba histolytica are in- 

 conspicuous and when it defies positive identification 

 by experienced observers. It is this fact which fre- 



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« 



Fig. 17. — Endamoeba coli. 



Drawings of trophozoite and cysts with one, two, four and eight 

 nuclei, from specimens stained by iron-haematoxylon. x 1000. 



quently produces an erroneous diagnosis of intestinal 

 amoebiasis in the practice of medicine. 



The nucleus of this amoeba, as distinguished from 

 Endamoeba histolytica, is usually visible in the fresh 

 unstained living and moving organism. It is seen 

 as a round ring, not a vacuole, in the more granular 

 and vacuolated endoplasm. It flows about during 



