85 
completely disappeared. * I myself, however, caught many tse-tse 
flies on the Chobi in 1899, where there were then no buffalo. 
in winter no doubt accounts for the comparative luxuriance of the 
Vegetation. The coldest month is July, in the middle of the me 
Season, when I have registered on the Okavango River in Lat. 19°58. 
a8 many as nine degrees of frost at night. The country is 
healthy throughout the dry season, but santrla and “ a aed 
uring 
Fever ” of a particularly virulent type attack Europeans dur 
the rains, especially in the depression of the Lake and the river 
area, where mosquitoes are a pest. . 
ene ss 
_ * Vide Mr. Selous’ paper in the Journal of the African Society, Jan., 1909. 
