MALARIA EXPEDITION TO NIGERIA 
221 
proportional numbers of the cases varying according to the time of the year. It will 
be noted in the following list that crescents (gametocytes) were frequently met with 
in native blood, and often several were found in each specimen — they are seldom 
seen, and then only exceedingly few (one or two per blood smear) in the blood of 
Europeans in West Africa. In the report 1 of the Royal Society's Commission, it was 
stated, as the opinion of its members, that quartan and tertian parasites do not exist 
in West Africa, but our specimens, which exhibit all stages of these parasites, from 
the young forms to fully matured sporocytes and gametocytes, negative this opinion. - 
It must be pointed out that no crescents were observed by them in the blood of native 
children. 
A. Children of Bonny Town 
Age 
No. Examined 
Result 
O-I 
6 
All negative 
The actual ages, where accuratelv noted, were three, eight, 
mx, eight and eight months respecti\el> 
1-2 
6 
4 positive 
Shewed four crescents 
(2) 
An occasional aestivo-autumnal ring form 
(3) 
Numerous aestivo-autumnal ring forms 
(4) 
One crescent ; one large and two small quartans 
2 "3 
7 
3 positive 
(1) 
An occasional ring form ; all stages of quartan parasites 
(2) 
Numerous aestivo-autumnal ring forms — all stages 
(3) 
3"+ 
1 0 
9 positive 
( 1 ) 
Two crescents 
(2) 
An occasional aestivo-autumnal ring 
(3) 
Seven crescents 
(4) 
Several aestivo-autumnal rings 
(5) 
Few aestivo-autumnal rings 
(6) 
A single crescent 
A few aestivo-autumnal rings 
(8) 
Several aestivo-autumnal rings 
(9) 
Numerous aestivo-autumnal rings, mostly of large size 
+-5 
7 
2 positive 
(0 
An occasional aestivo-autumnal ring 
(2) 
Few aestivo-autumnal rings 
5-6 
3 
6-7 
+ 
7-8 
3 
2 positive 
(0 
Three aestivo-autumnal rings seen 
(2) 
Numerous aestivo-autumnal rings — all stages 
8-9 
2 
9-10 
10 + 
12 
1 positive 
(0 
Numerous aestivo-autumnal rings : actual age twelve- 
thirteen years 
