BALANTIDIUM COLI. 691 



as well. The central part of the old parasites con 

 tains only the empty network of endoplasm, the 

 spores having disappeared, and a section at this 

 point strongly resembles that of a tubule. 



The parasites are nourished through osmosis. 

 None of the forms have definite motility. When 

 the parasite outgrows the muscle cell which con- 

 tains it, it is freed and becomes an intercellular 

 parasite. Eather vague references are made to 

 tumor-like formation as a consequence. 



Sarcosporidia have been found only in verte- occurrence. 

 brates, particularly in mammals; most often in 

 sheep and hogs, but also in the horse, ox, mouse, 

 rat. The muscles adjacent to the alimentary tract 

 are involved principally (esophagus," intestines, 

 diaphragm and abdominal muscles) and on this 

 account it is supposed that infection takes place 

 through the intestines. The exact method of in- 

 oculation is not known. 



Sarcocystis lindemanni (Sarcocystis Jiominis or 

 Gregarina lindemanni) is the only sarcosporidium 

 definitely identified in man. The parasites were 

 as large as 1.6 millimeters long and 170 microns 

 broad. They possessed a thin capsule, thickened 

 at the ends. The spores were banana-shaped and 

 from 8 to 9 microns long. The organisms were 

 found in the muscles of the larynx. 



VI. BALANTIDIUM COLI. 



B. Co'li is an infusorian (ciliate), with a more 

 or less oval body, mouth opening and a short 

 pharynx, is covered rather uniformly with short 

 cilia, and presents longitudinal striations. It con- 

 tains a bean-shaped chief nucleus and a secondary 

 nucleus and two vacuoles on the right side. It meas- 



