80 Drag Treatment of East Coast Fever of Cattle 
Chart relating to Control I {Cow 1). 
The body temperature is indicated by the thin line above. The increase in the percentage 
of infected red blood corpuscles is represented by the bold black line rising from 
T2 % on the 20th day after tick infestation to 56 % on the 27th day. The vertical 
columns represent the total number of infected corpuscles taken as 100 (corresponding 
to the percentage column on the left); the white part above each column represents 
the proportion of corpuscles containing a single parasite, the vertically, horizontally 
shaded, and black parts indicate respectively the projjortion of corpuscles containing 
2, 3 and 4 or more parasites. The days of observation are recorded below. The 
blood films were prepared every two hours, day and night, starting on day 22. 
