ILLUSTRATIONS 
[Figures drawn by Haughwout from camera lucida sketches. Map drawn by Macario Ligaya.] 
Plate 1 
Figs. 1 to 10. Stages of sporoblast formation in Isospora hominis (Rivolta). 
Plate 2 
Fig. 1. Late sporoblast stage in Isospora hominis (Rivolta). 
Figs. 2 and 3. Sporocyst stages. 
Fig. 4. Early development of sporozoites. 
Figs. 5 to 11. Types of cysts in full development. 
Fig. 12. Fully developed cyst after one week of dessication. 
Plate 3 
Figs. 1 to 12. Types of degenerated cysts of Isospora hominis (Rivolta). 
Plate 4 
Map showing geographic distribution of human coccidiosis. 
TEXT FIGURE 
Fig. 1. Oscillation of sporoblasts following cell division in Isospora hominis 
(Rivolta). 
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