AMCEBTC DYSENTERY. 



487 



distinguished from other forms not only by the presence of 

 amoebae but also by its pathological anatomy. The results 

 of these observers have been confirmed by those obtained in 

 JLgypt by Kruse and Pasquale, who have also supplied im- 

 portant facts regarding the pathogenic effects of the amoebae 

 when inoculated into animals. The following description 

 is chiefly taken from the monographs of the four writers 

 last mentioned. 



Amoebic Dysentery Characters of the Amoeba. 

 The amoebae, as seen in the stools in a case of dysentery, 



FIG. 108. Amoebae of dysentery. 



a and b, amoebae as seen in the fresh stools, showing blunt amoeboid processes of 

 ectoplasm. The endoplasm of a. shows a nucleus, three red corpuscles and numerous 

 vacuoles ; that of b, numerous red corpuscles and a few vacuoles. 



c, an amoeba as seen in a fixed film preparation, showing a small rounded nucleus 

 (Kruse and Pasquale). X 600. 



are rounded or somewhat irregular protoplasmic masses, 

 usually measuring about 25 to 35 //, in diameter, though 

 both larger and smaller forms are met with. 



When the parasite is at rest it has a more or less rounded 

 shape ; the protoplasm is finely granular and of refractile 

 appearance, and is without differentiation into layers. The 

 organism may show amoebic movements which are usually 

 of a sluggish character, but are sometimes pretty rapid on 

 a warm stage. When these occur, the amoeba shows 



