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 while in others it fell abruptly in a series of steps; rapids again were formed by great boulders that projected above the water, and I noticed one instance where the rocks made almost a barrier across the river, whilst only here and there were the gaps through which the current forced its way.

Were it not that the rapids are avoided by crocodiles, they would be impassable for canoes; but the absence of crocodiles makes it possible for the natives to disembark, and push or drag their craft across the obstacle. In places that are especially dangerous, it is found necessary to stow the baggage on the top of the boulders, and to take the boat over the rapid empty.

The first rapids at which we arrived were called by the natives Katima Molelo. Our oars sufficed to carry us over the first stretch of them, but afterwards the boatmen were obliged to get out and pull every canoe after them, taking care to lose no time in jumping in again, well aware that the deep water just beyond was almost sure to be a lurking-place for crocodiles.

On the 5th we crossed the rapids known as Mutshila Aumsinga, which, as I found to my cost, only too justly had the reputation of being the most dangerous of any of the Sesheke and Nambwe cataracts. I was still feeling very unwell, and could not even sit in my canoe without much pain; but there was nothing in my condition that alarmed me, and I continued to work at my chart of our course.

The Mutshila Aumsinga rapids are formed by a considerable slope in the river-bed, combined with the projection of numerous masses of rock above the Rh