38 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
In some cases parasites have been almost constantly present in the blood 
(Case 85) ; in others, as is shown by the two following cases, they have been 
rarely found. 
Case 77. Ejoli. Under observation for twenty-one days before death. Para- 
sites seen only twice on two consecutive days ; sixteen observations. 
Case 103. Belamo. Still under observation. Parasites not seen for thirty- 
eight days ; seventeen observations. They have been seen in the blood of this case 
only by centrifugalizing. 
The frequency with which the parasite is obviously present in the peripheral 
blood bears no relation to the severity of the symptoms. 
Number of Parasites Appearing in the Blood 
The number of parasites seen in ordinary fresh cover-slip preparations is 
generally small, but in some patients, very large numbers have been recorded. In 
two cases a large increase has occurred during the few days immediately preceding 
death. 
Case 87. Patesa. Admitted to hospital for acute dysentery ; under observa- 
tion for four days preceding death. Parasites increased from two to a cover on the 
first day to twenty to a field on the day of death. There was no accompanying rise 
of temperature. 
Necropsy showed very extensive dysenteric ulceration of the large intestine. 
Case 88. Boyo. Parasites increased during the four days preceding death 
from two to one hundred to a cover. They had not been previously seen in such 
large numbers. At the necropsy on this case very general enlargement and caseation 
of abdominal and thoracic glands was noted. There were no tubercular lesions in 
the lungs or other organs. 
A similar increase of parasites occurred just before death in Cases 62 and 82 
(see charts) ; but in the two following cases they were absent for some days before 
death : — 
Case 89. Kapinga. Parasites not seen for ten days preceding death ; six 
observations. 
Case 77. Ejoli. Parasites not seen for nineteen days before death ; fourteen 
observations. 
Sudden Disappearance of the Parasite from the Finger Blood 
The following are examples of cases in which the parasites have gradually 
increased from small to fairly large numbers (twenty to cover-slip or more) and then 
suddenly disappeared on the day after their acme was reached. 
Case 65. Mokoko. See chart. 
