346 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
results are obtained. Sections from fixed tissue are less satisfactory, 
though they may be made to show the parasite with great clearness. 
The chief facts relating to structure appear to be the presence of a 
hyaline zone around the microbic, the granular, and cellular forms, the 
existence of a nucleus in the cellular forms, and the presence of a doubly 
contoured capsule around the encysted forms. With regard to repro- 
duction, it seems that the parasites form spores freely, that some are 
large and some small, that there is a non-sporing cycle with direct 
division of the nucleus, and that there is a cycle of reproduction by 
means of microsporozoits or chromatozoits. 
The same parasite may also pass through several evolutionary 
cycles. 
