88 Geographical Notices. 
a continuous line of water to this extent, no one ever heardof 
any limit or boundary to the northern end of the lake. Are 
spectable Sowahili merchant assured me that, when engaged in 
traffic some years previously to the northward of the line and 
the westward of this lake, he had heard it commonly reported 
that large vessels frequerited the northern extremity of these 
expedition sent by Mahamad Ali up the Nile in former years? 
Concerning the rains which flood the Nile, the argument is sim- 
ple, as I have said before: a group of mountains overhang the 
northern bed of the Tanganyika Lake. The Arabs assure ts 
snow-clad mountain, Keenia, is drained by rivers on its westem 
slopes in a direction tending to my lake. 
There would be no material fluctuations observable in it, in re ; 
Sequence of its constant and near approximation to the path® — 
e sun 
a 
