38 
Leiicocytozoon canis etc. 
2. Fission of the original vermicules. 
3. Conjugation of two apparently similar vermicules, the result of 
this fission. 
4. The formation, as a result of conjugation, of a rapidly grosving 
oocyst and certain other details described in the paper. 
5. Growth of the oocyst. 
Diagram 1. Showing the developmental changes of 
Leiicocytozoon canis in the tick. 
6 . A change in the oocyst by which after reaching a certain size it 
loses its globular shape and becomes an irregularly shaped body as 
depicted in the plate accompanying the paper. (Fig. 25.) 
7. The formation of groups of sporozoites, as I then thought from 
the further development of the oocyst. 
Further work has shown that I was correct with the exception of the 
step from 6 to 7. 
