448 Proceedings of the Royal Physical Society. 
hematuric symptoms, are extremely common, as also are 
pernicious fevers. 
Along the rest of the coast malaria is very virulent as far 
as Cape Lopez. Some idea of its prevalence will be gained 
by mentioning the death-rate from 1878 to 1888. Unfortu- 
nately, the cause of death is net stated in the reports, but 
malaria appears to have been the chief cause. 
There are no means of ascertaining the number of Europeans 
in Gambia during the years in question, but I have reason to 
believe there were about 54. The average death-rate there 
was 10°10 per cent. At Lagos, from 1879 to 1888, there was 
an average of 110 European residents ; and the average death- 
rate was 10 percent. At Sierra Leone, the population during 
the same years was about 271, of whom 108 were a floating 
population, «.¢., belonging to ships in the harbour. The total 
deaths of the resident population were 44, of the floating 
population 31, giving a total number of deaths during the 
ten years of 75, being 42 per cent.. On the Gold Coast 
during the same year there was an average of 66 Government 
officials. There were 34 deaths, the average death-rate being 
51:43 per thousand. The non-official population was about 
126, the number of deaths 106, the death-rate being 81°48 per 
thousand; or, taking the officials and non-officials together, 
the death-rate per thousand would be 68:08, the average 
European population being 192. 
In the Niger district remittent fever is very virulent, and 
this district is remarkable for the prevalence of pernicious 
malarial fever. It is here also that we have most reported 
eases of so-called typho-malarial fever, the only other region 
where this complication seems to prevail being the Congo 
district; at Gaboon and in its near proximity malaria is 
most rife during the first three months of the year. 
In the Congo coast region the average death-rate from 
malarial fever appears to be about 30 per. cent. I shall 
refer to its prevalence in the upper regions of the Congo 
subsequently. 
To the south of Loanda, where the fever is very rife, 
malaria decreases in intensity and importance as we proceed 
southward. 
