PLATE XI. 



Fig. 1. a, b, e. Three different liost-cells, showing their nuclei and the intra- 

 cellular parasite. 



Fig. 2. A resting sporangium in development. Wall and fat globules omitted, 

 (x 2000.) 



Fig. 3. A ripening resting sporangium, showing the zoospores forming, and three 

 fat globules. 



Fig. 4. A resting sporangium cultivated in potato juice. The individual zoospores 

 are shown. 



Fig. 5. A ruptured sporangium from potato-juice culture. A few laggard zoospores 

 are shown. 



Fig. 6. Escaped zoospores, showing amoeboid changes and the single cilium. 

 (x 2000.) 



Fig. 7. Zoospores seen in the resting sporangium. Flemming-fised and stained 

 material. 



