454 Proceedings of the Royal Physical Society. 
typhoid symptoms. Dysentery is very common, and go is 
hepatitis, and tropical abscess of the liver is also met with. 
Phthisis would appear to be rarely seen, if at all. The 
ordinary diseases of the chest, however, occur; so do 
rheumatism and Egyptian chlorosis. Leprosy and yaws are 
both endemic in the Congo region, as also the disease of 
sleeping-sickness, as it is termed by writers from this region. 
As previously mentioned, I regard this disease as beri-beri. 
We next come to the remaining part of Equatorial Africa, 
that to the south of the Victoria Nyanza, surrounding Lakes 
Tanganyika and Nyassa, as far south as the Matabele 
country. Throughout this region malaria is again exten- 
sively met with, except in the highest regions. Enteric 
fever exists to the south of the Victoria Nyanza, and it 
appears to occur occasionally as far south as the Zambesi. 
Both diarrhcea and dysentery are found, but dysentery is 
reported to be exceedingly severe throughout the whole 
district, far more frequent in fact than it is either to the 
north or west. Rheumatism, dengue, leprosy, and syphilis 
are all prevalent, and so are the ordinary respiratory diseases, 
but phthisis is extremely rare. Hlephantiasis arabum is met 
with to the south-west of Tanganyika especially, but isolated 
cases are occasionally seen throughout the whole district. 
Tropical ulcers are seen very frequently in this district; so 
is ophthalmia, and probably beri-beri is widely distributed. 
Curiously enough, diseases of the liver and tropical abscess 
are rarely seen here, Diphtheria certainly exists, but it is 
not very prevalent. 
VII. Sour Arrica, 
including the country south of 18° S, lat. 
The area with which we have now to deal has a climate 
which differs much from any we have hitherto con- 
sidered; it resembles more nearly that of the témperate zone, 
in which zone indeed the greater part of the district lies. 
‘The country varies considerably in altitude, lying generally 
from 600 to 10,000 feet above sea-level. 
The mean annual temperature varies from 64° to 72° F,, 
