TRYPANOSOMES, TRYPANOSOMIASIS, AND SLEEPING SICKNESS n 
Periodicity of the Parasite in Natives — Continued 
Disasi 
Banja 
Days present •■• ••• ... 
1 1 3 
26 
Days absent 
104 
78 
33 
Longest period present — days 
1 2 
3 
8 
Longest period absent — days 
7 
2 5 
13 
These figures show that periodicity is very marked in some cases. The charts 
of these cases do not record any very marked rise of temperature coincident with an 
increase in the number of parasites. Mpangila had the parasites more constantly 
present but in smaller numbers than in the other two cases. From the periodicity 
columns the case of Disasi shows well the difficulty in making a diagnosis without 
daily examinations continued for a long period. 
