320 Trypanosoma lewisi 
case also no definite relation appears to exist between the Leucocytozoon 
prevalence and the flea prevalence 1 . 
Chart VII, showing the relation of temperature to the Leucocytozoon 
prevalence, appears to us to furnish similar indications to those discussed 
above. 
Chart VI. Prevalence of Leucocytozoon in Mus rattxis in Punjab (constructed from 
Plague Commission’s figures) and its relation to Eat flea prevalence, 1905, 1906. 
-= Leucocytozoon prevalence. 
.= Rat flea prevalence (from Plague Commission’s Reports). 
1 The fleas were taken from the rats examined for the Leucocytozoon. 
