FIG. 2. A sinple amoeba cyst and a 

 cluster of cysts ; suitable for pre- 

 paration of " pure mixed cul- 

 tures." 



FIG. 3. Photomicrograph of groups of cysts. 



Cover glass. 



Fie. 4. Apparatus for the continuous observation of amoebae by the jelly method under varied 



conditions of environment. 



- 

 i 



: I 







FIG. 5. Successive form changes in an amoabw examined by the jelly method. X, nucleus ; K, karyosome ; 

 CV, contractile vacuole ; FV. food vacuoles ; EC, ectoplasm ; En, endoplasm. 



22] 



