DIFFERENTIATION OF HUMAN AMCEB^E 



251 



conditions of a bacillary nature. The amoebae are less active, the nuclei 

 are clearly visible, while food vacuoles containing bacteria and other 

 objects are present. In cases of doubt it is necessary to wait till formed 



Fig. 117. — The Intestinal Amceb.e of Man (x 1,250). (After Wenyon, 1922.) 



A-C. Entamoeba histolytica. 



A. Tissue-invading f(n-ni with one nucleus and six ingested red blood-corpuscles. 



B. Precystic amoeba. C. Cyst with four nuclei and chroniatoid bodies. 



D-F. Entammha coli. 



D. Large amoeba with one nucleus and various ingested food bodies. 



E. Precystic amoeba. F. Cyst with eight nuclei. 



G-I. lodamoeba biiischlii. 

 G. Free amoeba. H. Precystic am ceba. 



I. Cyst with a single nucleus and glycogenic vacuole. 



•J-L. EndoUmax imna. 

 J. Free amoeba. K. Precystic amoeba, L. Cyst with four nuclei. 



M-N. Dienfamceba fragilis. 

 M-N. Forms with one and two nuclei. 



stools are being passed, when the characteristic cysts of E. coli or E. his- 

 tolytica will probably appear. The former are seen either with eight 

 nuclei or with two nuclei and large central vacuole; while the latter have 

 one, two, or four nuclei, and not infrequently chromatoid bodies and 



