ILLUSTRAnONS. 



Plate I. 



Photograph of colon, showing severe ulceration caused by Balantidium coli. 



Plate II, 



Fig. 1. Section through apparently normal colon, which microscopically shows 

 two balantidia lying in the submucosa causing cell infiltration which 

 will probably proceed to ulceration of the mucosa. 



2. Two balantidia lying in the submucosa. Practically no cell reaction 



present. 



3. Filarial embryos in spleen pulp, causing infarction. 



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