49 



From these and other observations Leishman was led to 

 the conclusion that the chromatin granules represent a stage 

 in the development of the parasite. These interesting 

 observations have been confirmed by Balfour (1911) in the 



FIG. 18. 



Section across A B above 



Diagram of mouth parts of tick. Ventral portion of capi- 

 tellum removed. PP, Pedipalps. CH, Chelicerae. H, Hypo- 

 stome. c, Capitellum. PHR, Pharyngeal pump, si), 

 Salivary ducts. M, Tube leading to mouth. 



analogous case of Argas persicus and fowl spirochcetae. 

 Some experiments by Kindle (1911) also have a bearing upon 

 this point. Kindle failed to find any spirochsetse in infected 

 ticks kept some time at 21 C. , but similar ticks warmed up 

 to 35 C. for a few days showed spirochsettc throughout the 

 body and at the same time all the organs were infective. 

 E 



