This Chicova is not a kingdom, as has been stated, but a level tract, a part of which is annually overflowed by the Zambesi, and is well adapted for the cultivation of corn.  It is said to be below the northern end of the hill Bungwe.  I was very much pleased in discovering this small specimen of such a precious mineral as coal.  I saw no indication of silver, and, if it ever was worked by the natives, it is remarkable that they have entirely lost the knowledge of it, and can not distinguish between silver and tin.  In connection with these basaltic dikes, it may be mentioned that when I reached Tete I was informed of the existence of a small rapid in the river near Chicova; had I known this previously, I certainly would not have left the river without examining it.  It is called Kebrabasa, and is described as a number of rocks which jut out across the stream.  I have no doubt but that it is formed by some of the basaltic dikes which we now saw, for they generally ran toward that point.  I was partly influenced in leaving the river by a wish to avoid several chiefs in that direction, who levy a heavy tribute on those who pass up or down.  Our path lay along the bed of the Nake for some distance, the banks being covered with impenetrable thickets.  The villages are not numerous, but we went from one to the other, and were treated kindly.  Here they call themselves Bambiri, though the general name of the whole nation is Banyai.  One of our guides was an inveterate talker, always stopping and asking for pay, that he might go on with a merry heart.  I thought that he led us in the most difficult paths in order to make us feel his value, for, after passing through one thicket after another, we always came into the bed of the Nake again, and as that was full of coarse sand, and the water only ankle deep, and as hot as a foot-bath from the powerful rays of the sun, we were all completely tired out.  He likewise gave us a bad character at every village we passed, calling to them that they were to allow him to lead us astray, as we were a bad set.  Sekwebu knew every word he said, and, as he became intolerable, I dismissed him, giving him six feet of calico I had bought from native traders, and telling him that his tongue was a nuisance.  It is in general best, when a scolding is necessary, to give it in combination with a present, and then end it by good wishes.  This fellow went off smiling, and my men remarked, “His tongue is cured now.”  The country around the Nake is hilly, and the valleys covered with tangled jungle.  The people who live in this district have reclaimed their gardens from the forest, and the soil is extremely fertile.  The Nake flows northerly, and then to the east.  It is 50 or 60 yards wide, but during most of the year is dry, affording water only by digging in the sand.  We found in its bed masses of volcanic rock, identical with those I subsequently recognized as such at Aden.