568

LEVEL PLAINS.-BIRDS.

CHAPTER XXIV.

Level Plains.-Vultures and other Birds.-Diversity of Color in Flowers of the same Species.-The Sundew.-Twenty-seventh Attack of Fever.-A River which flows in opposite Directions.-Lake Dilolo the Watershed between the Atlantic and Indian Oceans.-Position of Rocks.-Sir Roderick Murchison's Explanation. -Characteristics of the Rainy Season in connection with the Floods of the Zambesi and the Nile.-Probable Reason of Difference in Amount of Rain South and North of the Equator.-Arab Reports of Region east of Londa.-Probable Watershed of the Zambesi and the Nile.-Lake Dilolo.-Reach Katema's Town: his renewed Hospitality; desire to appear like a White Man; ludicrous Departurc.-Jackdaws.-Ford southern Branch of Lake Dilolo.-Small Fish.-Project for a Makololo Village near the Confluence of the Leeba and the Leeambye.— Hearty Welcome from Shinte.-Kolimbota's Wound.-Plant-seeds and Fruittrees brought from Angola.-Masiko and Limboa's Quarrel.-Nyamoana now a Widow.-Purchase Canoes and descend the Leeba.-Herds of wild Animals on its Banks.-Unsuccessful Buffalo-hunt.-Frogs.-Sinbad and the Tsetse.-Dispatch a Message to Manenko.-Arrival of her Husband Sambanza.-The Ceremony called Kasendi.-Unexpected Fee for performing a surgical Operation.— Social Condition of the Tribes.-Desertion of Mboenga.—Stratagem of Mambowe Hunters.-Water-turtles.-Charged by a Buffalo.—Reception from the People of Libonta.-Explain the Causes of our long Delay.-Pitsane's Speech.Thanksgiving Services.-Appearance of my "Braves."—Wonderful Kindness of the People.

AFTER leaving the Kasai, we entered upon the extensive level plains which we had formerly found in a flooded condition. The water on them was not yet dried up, as it still remained in certain hollow spots. Vultures were seen floating in the air, showing that carrion was to be found; and, indeed, we saw several of the large game, but so exceedingly wild as to be unapproachable. Numbers of caterpillars mounted the stalks of grass, and many dragonflies and butterflies appeared, though this was winter. The caprimulgus or goat-sucker, swifts, and different kinds of swallows, with a fiery-red bee-eater in flocks, showed that the lowest temperature here does not destroy the insects on which they feed. Jet-black larks, with yellow shoulders, enliven the mornings with their songs, but they do not continue so long on the wing as ours, nor soar so high. We saw many of the pretty white ardea, and

FLOWERS.-SUNDEW.

509

other water-birds, flying over the spots not yet dried up; and occasionally wild ducks, but these only in numbers sufficient to remind us that we were approaching the Zambesi, where every water-fowl has a home.

While passing across these interminable-looking plains, the eye rests with pleasure on a small flower, which exists in such numbers as to give its own hue to the ground. One broad band of yellow stretches across our path. On looking at the flowers which formed this golden carpet, we saw every variety of that color, from the palest lemon to the richest orange. Crossing a hundred yards of this, we came upon another broad band of the same flower, but blue, and this color is varied from the lightest tint to dark blue, and even purple. I had before observed the same flower possessing different colors in different parts of the country, and once a great number of liver-colored flowers, which elsewhere were yellow. Even the color of the birds changed with the district we passed through; but never before did I see such a marked change as from yellow to blue, repeated again and again on the same plain. Another beautiful plant attracted my attention so strongly on these plains that I dismounted to examine it. To my great delight I found it to be an old home acquaintance, a species of Drosera, closely resembling our own sundew (Drosera Anglia). The flower-stalk never attains a height of more than two or three inches, and the leaves are covered with reddish hairs, each of which has a drop of clammy fluid at its tip, making the whole appear as if spangled over with small diamonds. I noticed it first in the morning, and imagined the appearance was caused by the sun shining on drops of dew; but, as it continued to maintain its brilliancy during the heat of the day, I proceeded to investigate the cause of its beauty, and found that the points of the hairs exuded pure liquid, in, apparently, capsules of clear, glutinous matter. They were thus like dewdrops preserved from evaporation. The clammy fluid is intended to entrap insects, which, dying on the leaf, probably yield nutriment to the plant.

During our second day on this extensive plain I suffered from my twenty-seventh attack of fever, at a part where no surfacewater was to be found. We never thought it necessary to carry water with us in this region; and now, when I was quite unable to move on, my men soon found water to allay my burning thirst

510

PHENOMENON OF THE LOTEMBWA.

by digging with sticks a few feet beneath the surface. We had thus an opportunity of observing the state of these remarkable plains at different seasons of the year. Next day we pursued our and on the 8th of June we forded the Lotembwa to the N.W. of Dilolo, and regained our former path.

way,

The Lotembwa here is about a mile wide, about three feet deep, and full of the lotus, papyrus, arum, mat-rushes, and other aquatic plants. I did not observe the course in which the water flowed while crossing; but, having noticed before that the Lotembwa on the other side of the Lake Dilolo flowed in a southerly direction, I supposed that this was simply a prolongation of the same river beyond Dilolo, and that it rose in this large marsh, which we had not seen in our progress to the N.W. But when we came to the Southern Lotembwa, we were informed by Shakatwala that the river we had crossed flowed in an opposite direction—not into Dilolo, but into the Kasai. This phenomenon of a river running in opposite directions struck even his mind as strange; and, though I did not observe the current, simply from taking it for granted that it was toward the lake, I have no doubt that his assertion, corroborated as it was by others, is correct, and that the Dilolo is actually the watershed between the river systems that flow to the east and west.

I would have returned in order to examine more carefully this most interesting point, but, having had my lower extremities chilled in crossing the Northern Lotembwa, I was seized with vomiting of blood, and, besides, saw no reason to doubt the native testimony. The distance between Dilolo and the valleys leading to that of the Kasai is not more than fifteen miles, and the plains between are perfectly level; and, had I returned, I should only have found that this little lake Dilolo, by giving a portion to the Kasai and another to the Zambesi, distributes its waters to the Atlantic and Indian Oceans. I state the fact exactly as it opened to my own mind, for it was only now that I apprehended the true form of the river systems and continent. I had seen the various rivers of this country on the western side flowing from the subtending ridges into the centre, and had received information from natives and Arabs that most of the rivers on the eastern side of the same great region took a somewhat similar course from an elevated ridge there, and that all united in two main drains, the one

flowing to the north and the other to the south, and that the northern drain found its way out by the Congo to the west, and the southern by the Zambesi to the east. I was thus on the watershed, or highest point of these two great systems, but still not more than 4000 feet above the level of the sea, and 1000 feet lower than the top of the western ridge we had already crossed; yet, instead of lofty snow-clad mountains appearing to verify the conjectures of the speculative, we had extensive plains, over which one may travel a month without seeing any thing higher than an ant-hill or a tree. I was not then aware that any one else had discovered the elevated trough form of the centre of Africa.

I had observed that the old schistose rocks on the sides dipped in toward the centre of the country, and their strike nearly corresponded with the major axis of the continent; and also that where the later erupted trap rocks had been spread out in tabular masses over the central plateau, they had borne angular fragments of the older rocks in their substance; but the partial generalization which the observations led to was, that great volcanic action had taken place in ancient times, somewhat in the same way it does now, at distances of not more than three hundred miles from the sea, and that this igneous action, extending along both sides of the continent, had tilted up the lateral rocks in the manner they are now seen to lie. The greater energy and more extended range of igneous action in those very remote periods when Africa was formed, embracing all the flanks, imparted to it its present very simple literal outline. This was the length to which I had

come.

The trap rocks, which now constitute the "filling up" of the great valley, were always a puzzle to me till favored with Sir Roderick Murchison's explanation of the original form of the continent, for then I could see clearly why these trap rocks, which still lie in a perfectly horizontal position on extensive areas, held in their substance angular fragments, containing algæ of the old schists, which form the bottom of the original lacustrine basin : the traps, in bursting through, had broken them off and preserved them. There are, besides, ranges of hills in the central parts, composed of clay and sandstone schists, with the ripple mark distinct, in which no fossils appear; but as they are usually tilted away from the masses of horizontal trap, it is probable that they

512

SIR R. MURCHISON'S EXPLANATION.

too were a portion of the original bottom, and fossils may yet be found in them.*

The characteristics of the rainy season in this wonderfully humid region may account in some measure for the periodical floods of the Zambesi, and perhaps the Nile. The rains seem to follow the course of the sun, for they fall in October and November, when the sun passes over this zone on his way south. On reaching the tropic of Capricorn in December, it is dry; and December and January are the months in which injurious droughts are most dreaded near that tropic (from Kolobeng to Linyanti). As he returns again to the north in February, March, and April, we have the great rains of the year; and the plains, which in October and November were well moistened, and imbibed rain like sponges, now become supersaturated, and pour forth those floods of clear water which inundate the banks of the Zambesi. Somewhat the same phenomenon probably causes the periodical inundations of the Nile. The two rivers rise in the same region; but there is a difference in the period of flood, possibly from their

After dwelling upon the geological structure of the Cape Colony as developed by Mr. A. Bain, and the existence in very remote periods of lacustrine conditions in the central part of South Africa, as proved by fresh-water and terrestrial fossils, Sir Roderick Murchison thus writes:

"Such as South Africa is now, such have been her main features during countless past ages anterior to the creation of the human race; for the old rocks which form her outer fringe unquestionably circled round an interior marshy or lacustrine country, in which the Dicynodon flourished, at a time when not a single animal was similar to any living thing which now inhabits the surface of our globe. The present central and meridian zone of waters, whether lakes or marshes, extending from Lake Tchad to Lake 'Ngami, with hippopotami on their banks, are therefore but the great modern residual geographical phenomena of those of a mesozoic age. The differences, however, between the geological past of Africa and her present state are Since that primeval time, the lands have been much elevated above the sea-level-eruptive rocks piercing in parts through them; deep rents and defiles have been suddenly formed in the subtending ridges through which some rivers escape outward.

enormous.

"Travelers will eventually ascertain whether the basin-shaped structure, which is here announced as having been the great feature of the most ancient, as it is of the actual geography of South Africa (i. e., from primeval times to the present day), does, or does not, extend into Northern Africa. Looking at that much broader portion of the continent, we have some reason to surmise that the higher mountains also form, in a general sense, its flanks only.”—President's Address, Royal Geographical Society, 1852, p. cxxiii.