230 THOMPSON YATES LABORATORIES REPORT 
Haemamoebidae in Europeans. The habit of taking quinine, prevalent among 
Europeans in West Africa, on every occasion of indisposition, makes the examination 
of their blood, during an attack of malarial fever, very difficult. Occasionally we 
met with a case which showed numerous parasites in every field of the microscope, 
but more generally found very few, and often no parasites at all. It is common 
experience that parasites often rapidly disappear from peripheral blood on the 
administration of quinine. 
Dr. Hanley, the District Medical Officer at Opobo, was kind enough to make 
specimens of blood smears for us from all the Europeans available in his district, 
independent of the presence of an attack of ' fever ' at the time. The results, 
with some remarks, are given in the following table : — 
Name 
Length of present 
stay on coast 
Total time on 
the coast 
Result and Remarks 
F 
4 months 
Has had 7 years on the Coast, then 7 years away previous 
to present visit. No parasites 
H 
1 o months 
Negative 
P 
I 6 months 
Negative 
A 
2 years and 
4 months 
I o years 
Negative. Has had but little fever. Haemoglobin esti- 
mated at 65 per cent. 
R 
4 months 
Negative. Had attack of fever 15 days after arrival on 
R 
4 months 
Showed a very occasional ring form. Temperature at 
time of taking specimen, 101 F. 
P 
5^ months 
i o years 
Negative. Haemoglobin estimated at 80 per cent. 
H 
18 months 
3 ring forms found 
T ( 
T | 
(2nd specimen) | 
30 years 
T T 1 J 1 1 * • J 1 1 
Has an enlarged spleen reaching midway between the 
umbilicus and the symphysis pubis. Has had fairly 
good health. Examination of blood, negative. Haemo- 
globin estimated at 30 and 20 per cent, on the two 
occasions 
G 
2nd voyage 
Negative 
Mcl 
I 2 months 
One crescent found. Has had bad health lately. One 
attack of fever eight months after arrival 
T 
2nd voyage 
Negative 
B 
6 weeks 
2nd voyage 
Negative 
M 
8 months 
Negative 
T 
6 months 
1 1 years 
Negative 
M 
2 years and 
4 months 
8 years 
Negative 
D 
4 months 
6 years 
Negative 
M 
6 months 
Negative 
H 
9 months 
Negative 
