I imagined the slight elevation (Katongo) might be healthy, but was informed that no part of this region is exempt from fever. When the waters begin to retire from this valley, such masses of decayed vegetation and mud are exposed to the torrid sun that even the natives suffer severely from attacks of fever. The grass is so rank in its growth that one can not see the black alluvial soil of the bottom of this periodical lake. Even when the grass falls down in winter, or is "laid" by its own weight, one is obliged to lift the feet so high, to avoid being tripped up by it, as to make walking excessively fatiguing. Young leches are hidden beneath it by their dams; and the Makololo youth complain of being unable to run in the Barotse land on this account. There was evidently no healthy spot in this quarter; and the current of the river being about four and a half miles per hour (one hundred yards in sixty seconds), I imagined we might find what we needed in the higher lands, from which the river seemed to come. I resolved, therefore, to go to the utmost limits of the Barotse country before coming to a final conclusion. Katongo was the best place we had seen; but, in order to accomplish a complete examination, I left Sekeletu at Naliele, and ascended the river. He furnished me with men, besides my rowers, and among the rest a herald, that I might enter his villages in what is considered a dignified manner. This, it was supposed, would be effected by the herald shouting out at the top of his voice, "Here comes the lord; the great lion;" the latter phrase being "tau e tona", which, in his imperfect way of pronunciation, became "Sau e tona", and so like "the great sow" that I could not receive the honor with becoming gravity, and had to entreat him, much to the annoyance of my party, to be silent. In our ascent we visited a number of Makololo villages, and were always received with a hearty welcome, as messengers to them of peace, which they term "sleep". They behave well in public meetings, even on the first occasion of attendance, probably from the habit of commanding the Makalaka, crowds of whom swarm in every village, and whom the Makololo women seem to consider as especially under their charge.