This, And Broad
Horizontal Strata Of Trap, Sometimes A Hundred Miles In Extent,
And Each Layer Having An Inch Or So Of Black Silicious Matter On It,
As If It Had Floated There While In A State Of Fusion,
Form A Great Part Of The Bottom Of The Central Valley.
These rocks,
in the southern part of the country especially, are often covered
with twelve or fifteen feet of soft calcareous tufa.
At Bombwe we have
the same trap, with radiated zeolite, probably mesotype, and it again appears
at the confluence of the Chobe, farther down.
As we passed up the river, the different villages of Banyeti turned out
to present Sekeletu with food and skins, as their tribute.
One large village is placed at Gonye, the inhabitants of which
are required to assist the Makololo to carry their canoes past the falls.
The tsetse here lighted on us even in the middle of the stream.
This we crossed repeatedly, in order to make short cuts at bends of the river.
The course is, however, remarkably straight among the rocks;
and here the river is shallow, on account of the great breadth of surface
which it covers. When we came to about 16d 16' S. latitude,
the high wooded banks seemed to leave the river, and no more tsetse appeared.
Viewed from the flat, reedy basin in which the river then flowed,
the banks seemed prolonged into ridges, of the same wooded character,
two or three hundred feet high, and stretched away to the N.N.E. and N.N.W.
until they were twenty or thirty miles apart.
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