ENTAMCEBA HISTOLYTICA 



187 



At any time the discharged amoebae may infect fresh areas, so that 

 the large intestines of these cases show every stage in the formation of the 

 ulcers, from the smallest yellow nodules to large, undermined ulcers. 





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Fig. 93. — Amcebic Ulceration: Section of a Small Ulcer in a Human Large 

 Intestine ( x 30). (Original.) 

 The area marked by a square is shown under higher magnification at Fig. 94. 



The best pictures from a histological point of view are obtained by 

 cutting sections of the small nodules which have not yet become subject 

 to secondary bacterial invasion, while at post-mortem examinations the 

 contents of one of these small nodules will often show still live and active 



