122 
Theilerid parva 
The body temperature is indicated by the thin line above. The increase in the percentage 
of infected corpuscles is represented by the bold black line rising from 5% to 75 °/ 0 . 
The vertical columns represent the total number of infected corpuscles taken as 100 ; 
the white parts of the columns represent the proportion of corpuscles containing a 
single parasite, the vertically shaded, cross-shaded and black parts indicate respect¬ 
ively the proportion of corpuscles containing two, three, and four or more parasites. 
The numbers (19—31) below indicate the days reckoned from the time when the 
infected ticks were placed on the cow. 
