A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries. David LivingstoneЧитать онлайн книгу.
and had the foremost of the party lost his hold, he would have hurled all behind him into the river at the foot of the promontory; yet in this wild hot region, as they descended again to the river, they met a fisherman casting his hand-net into the boiling eddies, and he pointed out the cataract of Morumbwa; within an hour they were trying to measure it from an overhanging rock, at a height of about one hundred feet. When you stand facing the cataract, on the north bank, you see that it is situated in a sudden bend of the river, which is flowing in a short curve; the river above it is jammed between two mountains in a channel with perpendicular sides, and less than fifty yards wide; one or two masses of rock jut out, and then there is a sloping fall of perhaps twenty feet in a distance of thirty yards. It would stop all navigation, except during the highest floods; the rocks showed that the water then rises upwards of eighty feet perpendicularly.
Still keeping the position facing the cataract, on its right side rises Mount Morumbwa from 2000 to 3000 feet high, which gives the name to the spot. On the left of the cataract stands a noticeable mountain which may be called onion-shaped, for it is partly conical and a large concave flake has peeled off, as granite often does, and left a broad, smooth convex face as if it were an enormous bulb. These two mountains extend their bases northwards about half a mile, and the river in that distance, still very narrow, is smooth, with a few detached rocks standing out from its bed. They climbed as high up the base of Mount Morumbwa, which touches the cataract, as they required. The rocks were all water-worn and smooth, with huge potholes, even at 100 feet above low water. When at a later period they climbed up the north-western base of this same mountain, the familiar face of the onion-shaped one opposite was at once recognised; one point of view on the talus of Mount Morumbwa was not more than 700 or 800 yards distant from the other, and they then completed the survey of Kebrabasa from end to end.
They did not attempt to return by the way they came, but scaled the slope of the mountain on the north. It took them three hours’ hard labour in cutting their way up through the dense thornbush which covered the ascent. The face of the slope was often about an angle of 70 degrees, yet their guide Shokumbenla, whose hard, horny soles, resembling those of elephants, showed that he was accustomed to this rough and hot work, carried a pot of water for them nearly all the way up. They slept that night at a well in a tufaceous rock on the N.W. of Chipereziwa, and never was sleep more sweet.
A band of native musicians came to our camp one evening, on our own way down, and treated us with their wild and not unpleasant music on the Marimba, an instrument formed of bars of hard wood of varying breadth and thickness, laid on different-sized hollow calabashes, and tuned to give the notes; a few pieces of cloth pleased them, and they passed on.
The rainy season of Tette differs a little from that of some of the other intertropical regions; the quantity of rain-fall being considerably less. It begins in November and ends in April. During our first season in that place, only a little over nineteen inches of rain fell. In an average year, and when the crops are good, the fall amounts to about thirty-five inches. On many days it does not rain at all, and rarely is it wet all day; some days have merely a passing shower, preceded and followed by hot sunshine; occasionally an interval of a week, or even a fortnight, passes without a drop of rain, and then the crops suffer from the sun. These partial droughts happen in December and January. The heat appears to increase to a certain point in the different latitudes so as to necessitate a change, by some law similar to that which regulates the intense cold in other countries. After several days of progressive heat here, on the hottest of which the thermometer probably reaches 103 degrees in the shade, a break occurs in the weather, and a thunderstorm cools the air for a time. At Kuruman, when the thermometer stood above 84 degrees, rain might be expected; at Kolobeng, the point at which we looked for a storm was 96 degrees. The Zambesi is in flood twice in the course of the year; the first flood, a partial one, attains its greatest height about the end of December or beginning of January; the second, and greatest, occurs after the river inundates the interior, in a manner similar to the overflow of the Nile, this rise not taking place at Tette until March. The Portuguese say that the greatest height which the March floods attain is thirty feet at Tette, and this happens only about every fourth year; their observations, however, have never been very accurate on anything but ivory, and they have in this case trusted to memory alone. The only fluviometer at Tette, or anywhere else on the river, was set up at our suggestion; and the first flood was at its greatest height of thirteen feet six inches on the 17th January, 1859, and then gradually fell a few feet, until succeeded by the greater flood of March. The river rises suddenly, the water is highly discoloured and impure, and there is a four-knot current in many places; but in a day or two after the first rush of waters is passed, the current becomes more equally spread over the whole bed of the river, and resumes its usual rate in the channel, although continuing in flood. The Zambesi water at other times is almost chemically pure, and the photographer would find that it is nearly as good as distilled water for the nitrate of silver bath.
A third visit to Kebrabasa was made for the purpose of ascertaining whether it might be navigable when the Zambesi was in flood, the chief point of interest being of course Morumbwa; it was found that the rapids observed in our first trip had disappeared, and that while they were smoothed over, in a few places the current had increased in strength. As the river fell rapidly while we were on the journey, the cataract of Morumbwa did not differ materially from what it was when discovered. Some fishermen assured us that it was not visible when the river was at its fullest, and that the current was then not very strong. On this occasion we travelled on the right bank, and found it, with the additional inconvenience of rain, as rough and fatiguing as the left had been. Our progress was impeded by the tall wet grass and dripping boughs, and consequent fever. During the earlier part of the journey we came upon a few deserted hamlets only; but at last in a pleasant valley we met some of the people of the country, who were miserably poor and hungry. The women were gathering wild fruits in the woods. A young man having consented for two yards of cotton cloth to show us a short path to the cataract led us up a steep hill to a village perched on the edge of one of its precipices; a thunderstorm coming on at the time, the headman invited us to take shelter in a hut until it had passed. Our guide having informed him of what he knew and conceived to be our object, was favoured in return with a long reply in well-sounding blank verse; at the end of every line the guide, who listened with deep attention, responded with a grunt, which soon became so ludicrous that our men burst into a loud laugh. Neither the poet nor the responsive guide took the slightest notice of their rudeness, but kept on as energetically as ever to the end. The speech, or more probably our bad manners, made some impression on our guide, for he declined, although offered double pay, to go any further.
A great deal of fever comes in with March and April; in March, if considerable intervals take place between the rainy days, and in April always, for then large surfaces of mud and decaying vegetation are exposed to the hot sun. In general an attack does not continue long, but it pulls one down quickly; though when the fever is checked the strength is as quickly restored. It had long been observed that those who were stationed for any length of time in one spot, and lived sedentary lives, suffered more from fever than others who moved about and had both mind and body occupied; but we could not all go in the small vessel when she made her trips, during which the change of place and scenery proved so conducive to health; and some of us were obliged to remain in charge of the expedition’s property, making occasional branch trips to examine objects of interest in the vicinity. Whatever may be the cause of the fever, we observed that all were often affected at the same time, as if from malaria. This was particularly the case during a north wind: it was at first commonly believed that a daily dose of quinine would prevent the attack. For a number of months all our men, except two, took quinine regularly every morning. The fever some times attacked the believers in quinine, while the unbelievers in its prophylactic powers escaped. Whether we took it daily, or omitted it altogether for months, made no difference; the fever was impartial, and seized us on the days of quinine as regularly and as severely as when it remained undisturbed in the medicine chest, and we finally abandoned the use of it as a prophylactic altogether. The best preventive against fever is plenty of interesting work to do, and abundance of wholesome food to eat. To a man well housed and clothed, who enjoys these advantages, the fever at Tette will not prove a more formidable enemy than a common cold; but let one of these be wanting—let him be indolent, or guilty of excesses in eating or drinking, or have poor, scanty fare—and the fever will probably