52 MANUAL OF HUMAN PROTOZOA 



cally. In older cysts, the movement ceases. The protoplasm 

 of the cvst is hyaline, but granulated and does not usually 

 contain any solid food particles. The macronucleus, peri- 

 stome and a contractile vacuole are often noticeable in the 

 cyst. 



2. Stained specimens. Not much advantage is obtained 

 by staining cysts (Fig. 13, 4). The macronucleus appears 

 to be the most conspicuous structure. Two individuals may 

 occasionally encyst together. 



