Kebrabasa Rapids--Tette--African fever--Exploration of the Shire--
Discovery of Lake Shirwa.
Our curiosity had been so much excited by the reports we had heard of the Kebrabasa rapids, that we resolved to make a short examination of them, and seized the opportunity of the Zambesi being unusually low, to endeavour to ascertain their character while uncovered by the water.We reached them on the 9th of November.The country between Tette and Panda Mokua, where navigation ends, is well wooded and hilly on both banks.Panda Mokua is a hill two miles below the rapids, capped with dolomite containing copper ore.
Conspicuous among the trees, for its gigantic size, and bark coloured exactly like Egyptian syenite, is the burly Baobab.It often makes the other trees of the forest look like mere bushes in comparison.A
Hollow one, already mentioned, is 74 feet in circumference, another was 84, and some have been found on the West Coast which measure 100
feet.The lofty range of Kebrabasa, consisting chiefly of conical hills, covered with scraggy trees, crosses the Zambesi, and confines it within a narrow, rough, and rocky dell of about a quarter of a mile in breadth; over this, which may be called the flood-bed of the river, large masses of rock are huddled in indescribable confusion.
The drawing, for the use of which, and of others, our thanks are due to Lord Russell, conveys but a faint idea of the scene, inasmuch as the hills which confine the river do not appear in the sketch.The chief rock is syenite, some portions of which have a beautiful blue tinge like lapis lazuli diffused through them; others are grey.
Blocks of granite also abound, of a pinkish tinge; and these with metamorphic rocks, contorted, twisted, and thrown into every conceivable position, afford a picture of dislocation or unconformability which would gladden a geological lecturer's heart;
But at high flood this rough channel is all smoothed over, and it then conforms well with the river below it, which is half a mile wide.In the dry season the stream runs at the bottom of a narrow and deep groove, whose sides are polished and fluted by the boiling action of the water in flood, like the rims of ancient Eastern wells by the draw-ropes.The breadth of the groove is often not more than from forty to sixty yards, and it has some sharp turnings, double channels, and little cataracts in it.As we steamed up, the masts of the "Ma Robert," though some thirty feet high, did not reach the level of the flood-channel above, and the man in the chains sung out, "No bottom at ten fathoms."Huge pot-holes, as large as draw-wells, had been worn in the sides, and were so deep that in some instances, when protected from the sun by overhanging boulders, the water in them was quite cool.Some of these holes had been worn right through, and only the side next the rock remained; while the sides of the groove of the flood-channel were polished as smooth as if they had gone through the granite-mills of Aberdeen.The pressure of the water must be enormous to produce this polish.It had wedged round pebbles into chinks and crannies of the rocks so firmly that, though they looked quite loose, they could not be moved except with a hammer.The mighty power of the water here seen gave us an idea of what is going on in thousands of cataracts in the world.All the information we had been able to obtain from our Portuguese friends amounted to this, that some three or four detached rocks jutted out of the river in Kebrabasa, which, though dangerous to the cumbersome native canoes, could be easily passed by a steamer, and that if one or two of these obstructions were blasted away with gunpowder, no difficulty would hereafter be experienced.After we had painfully explored seven or eight miles of the rapid, we returned to the vessel satisfied that much greater labour was requisite for the mere examination of the cataracts than our friends supposed necessary to remove them; we therefore went down the river for fresh supplies, and made preparation for a more serious survey of this region.
The steamer having returned from the bar, we set out on the 22nd of November to examine the rapids of Kebrabasa.We reached the foot of the hills again, late in the afternoon of the 24th, and anchored in the stream.Canoe-men never sleep on the river, but always spend the night on shore.The natives on the right bank, in the country called Shidima, who are Banyai, and even at this short distance from Tette, independent, and accustomed to lord it over Portuguese traders, wondered what could be our object in remaining afloat, and were naturally suspicious at our departing from the universal custom.
They hailed us from the bank in the evening with "Why don't you come and sleep onshore like other people?"
The answer they received from our Makololo, who now felt as independent as the Banyai, was, "We are held to the bottom with iron;you may see we are not like your Bazungu."
This hint, a little amplified, saved us from the usual exactions.It is pleasant to give a present, but that pleasure the Banyai usually deny to strangers by ****** it a fine, and demanding it in such a supercilious way, that only a sorely cowed trader could bear it.
They often refuse to touch what is offered--throw it down and leave it--sneer at the trader's slaves, and refuse a passage until the tribute is raised to the utmost extent of his means.
