s- 11 



Fie. 159. 5 liies. 1, tuber showing wounds made during early 



development of the parasite ; 2, section of .same potato; 3, mature spore- 

 balls of Spongospora ; 4, araoeb lid bodies of Spongospora in a p II, the 

 starch has already dis I; 5, showing the amoeboid bodies fused tq 

 form a Plasmodium in a potato cell; 6, a more advanced stage of the 

 Plasmodium ; 7, the Plasmodium in a still more advanced stage, showing its 

 substance broken up into a layer of spores forming a ' spore-ball ' ; 8 and 9, 

 free spore-balls that have escaped from the cells of the potato; 10, cells 

 forming a spore-ball; 11, amoeboid bodies that have m the cells 

 of a spore-ball ; 12, portion of Plasmodium showing nuclei. Figs. 1 and 2 

 nat. size ; the remainder highly mag. 



