Balantidium Diarrhea 709 



but except the encysted forms all die very quickly as the 

 fecal matter dies. Unfortunately the further life-history of 

 the encysted forms is unknown. 



FLAGELLATES IN THE HUMAN INTESTINES. 



In certain cases of diarrhea, flagellates Trichimonas in- 

 testinalis, Cercomonas intestinalis, and Lamblia (Megasto- 

 mum) intestinalis have been discovered. As, however, they 

 seem to be frequent denizens of normal intestines, it is 

 doubtful whether their presence is more than incidental. 



