A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries. David LivingstoneЧитать онлайн книгу.
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 become a more serious matter. It is of a milder type at Tette than at Quillimane or on the low sea-coast; and, as in this part of Africa one is as liable to fever as to colds in England, it would be advisable for strangers always to hasten from the coast to the high lands, in order that when the seizure does take place, it may be of the mildest type. Although quinine was not found to be a preventive, except possibly in the way of acting as a tonic, and rendering the system more able to resist the influence of malaria, it was found invaluable in the cure of the complaint, as soon as pains in the back, sore bones, headache, yawning, quick and sometimes intermittent pulse, noticeable pulsations of the jugulars, with suffused eyes, hot skin, and foul tongue, began. 1
Very curious are the effects of African fever on certain minds. Cheerfulness vanishes, and the whole mental horizon is overcast with black clouds of gloom and sadness. The liveliest joke cannot provoke even the semblance of a smile. The countenance is grave, the eyes suffused, and the few utterances are made in the piping voice of a wailing infant. An irritable temper is often the first symptom of approaching fever. At such times a man feels very much like a fool, if he does not act like one. Nothing is right, nothing pleases the fever-stricken victim. He is peevish, prone to find fault and to contradict, and think himself insulted, and is exactly what an Irish naval surgeon before a court-martial defined a drunken man to be: “a man unfit for society.”
Finding that it was impossible to take our steamer of only ten-horse power through Kebrabasa, and convinced that, in order to force a passage when the river was in flood, much greater power was required, due information was forwarded to Her Majesty’s Government, and application made for a more suitable vessel. Our attention was in the mean time turned to the exploration of the river Shiré, a northern tributary of the Zambesi, which joins it about a hundred miles from the sea. We could learn nothing satisfactory from the Portuguese regarding this affluent; no one, they said, had ever been up it, nor could they tell whence it came. Years ago a Portuguese expedition is said, however, to have attempted the ascent, but to have abandoned it on account of the impenetrable duckweed (Pistia stratiotes.) We could not learn from any record that the Shiré had ever been ascended by Europeans. As far, therefore, as we were concerned, the exploration was absolutely new. All the Portuguese believed the Manganja to be brave but bloodthirsty savages; and on our return we found that soon after our departure a report was widely spread that our temerity had been followed by fatal results, Dr. Livingstone having been shot, and Dr. Kirk mortally wounded by poisoned arrows.
Our first trip to the Shiré was in January, 1859. A considerable quantity of weed floated down the river for the first twenty-five miles, but not sufficient to interrupt navigation with canoes or with any other craft. Nearly the whole of this aquatic plant proceeds from a marsh on the west, and comes into the river a little beyond a lofty hill called Mount Morambala.
A remedy composed of from six to eight grains of resin of jalap, the same of rhubarb, and three each of calomel and quinine, made up into four pills, with tincture of cardamoms, usually relieved all the symptoms in five or six hours. Four pills are a full dose for a man—one will suffice for a woman. They received from our men the name of “rousers,” from their efficacy in rousing up even those most prostrated. When their operation is delayed, a dessert-spoonful of Epsom salts should be given. Quinine after or during the operation of the pills, in large doses every two or three hours, until deafness or cinchonism ensued, completed the cure. The only cases in which, we found ourselves completely helpless, were those in which obstinate vomiting ensued.