SIXTH ANNUAL REPORT. 



115 



BALANTIDIUM CO LI IN AN ORANG-UTAN. 



A micro-photograph, magnification 850 diameters, showing the presence of the parasites in the 

 muscular coat of the large intestine. 



ations and from chronic irritation. Most of the glands were de- 

 stroyed, but in those remaining the parasite was found, sur- 

 rounded by many evidences of a chronic inflammatory process. 



The last two cases show the great difficulty, perhaps the im- 

 possibility, of ridding the colon of this parasite. Undoubtedly 

 all such cases will be subject to returns of the attack when any 

 slight gastero-intestinal irritation is set up. This was proven to 

 be the case with Sally, but, so far, careful watching and prompt 

 treatment have kept her alive ; but eternal vigilance will be the 

 price of Sally. 



