PLATE X. 



Figs. 1 and 2. Mierophotographs of the same sporangium at two different levels. 

 In fig. 1 the zoosx^ores are just recognizable as distinct. 

 In fig. 2 the slit-like rupture of the wall of the sporangium is seen. 



Figs. 3 and 4. Mierophotographs of vertical sections of a young wart convolution 

 showing early stages of infection and of intracellular sporangium, 

 n is the host-cell nucleus, 

 p is the parasite. 



Fig. 5. Microphotograph of two resting sporarngia, showing their central vacuoles 

 normally occupied by one or more fat globules. In the sporangium to 

 the right the multinucleate condition is clear. 



