all its remaining humidity, and few showers can be given to the middle and western lands in consequence of the increased hygrometric power.
This is the same phenomenon, on a gigantic scale, as that which takes place on Table Mountain, at the Cape, in what is called the spreading of the "table-cloth". The southeast wind causes a mass of air, equal to the diameter of the mountain, suddenly to ascend at least three thousand feet; the dilatation produced by altitude, with its attendant cold, causes the immediate formation of a cloud on the summit; the water in the atmosphere becomes visible; successive masses of gliding-up and passing-over air cause the continual formation of clouds, but the top of the vapory mass, or "table-cloth", is level, and seemingly motionless; on the lee side, however, the thick volumes of vapor curl over and descend, but when they reach the point below, where greater density and higher temperature impart enlarged capacity for carrying water, they entirely disappear.
Now if, instead of a hollow on the lee side of Table Mountain, we had an elevated heated plain, the clouds which curl over that side, and disappear as they do at present when a "southeaster" is blowing, might deposit some moisture on the windward ascent and top; but the heat would then impart the increased capacity the air now receives at the lower level in its descent to leeward, and, instead of an extended country with a flora of the 'Disa grandiflora', 'gladiolus', 'rushes', and 'lichens', which now appear on Table Mountain, we should have only the hardy vegetation of the Kalahari.
Why there should be so much vegetation on the Kalahari may be explained by the geological formation of the country. There is a rim or fringe of ancient rocks round a great central valley, which, dipping inward, form a basin, the bottom of which is composed of the oldest silurian rocks. This basin has been burst through and filled up in many parts by eruptive traps and breccias, which often bear in their substances angular fragments of the more ancient rocks, as shown in the fossils they contain. Now, though large areas have been so dislocated that but little trace of the original valley formation appears, it is highly probable that the basin shape prevails over large tracts of the country; and as the strata on the slopes, where most of the rain falls, dip in toward the centre, they probably guide water beneath the plains but ill supplied with moisture from the clouds. The phenomenon of stagnant fountains becoming by a new and deeper outlet never-failing streams may be confirmatory of the view that water is conveyed from the sides of the country into the bottom of the central valley; and it is not beyond the bounds of possibility that the wonderful river system in the north, which, if native information be correct, causes a considerable increase of water in the springs called Matlomagan-yana (the Links), extends its fertilizing influence beneath the plains of the Kalahari.
The peculiar formation of the country may explain why there is such a difference in the vegetation between the 20th and 30th parallels of latitude in South Africa and the same latitudes in Central Australia. The want of vegetation is as true of some parts too in the centre of South America as of Australia; and the cause of the difference holds out a probability for the success of artesian wells in extensive tracts of Africa now unpeopled solely on account of the want of surface water. We may be allowed to speculate a little at least on the fact of much greater vegetation, which, from whatever source it comes, presents for South Africa prospects of future greatness which we can not hope for in Central Australia. As the interior districts of the Cape Colony are daily becoming of higher value, offering to honest industry a fair remuneration for capital, and having a climate unequaled in salubrity for consumptive patients, I should unhesitatingly recommend any farmer at all afraid of that complaint in his family to try this colony. With the means of education already possessed, and the onward and upward movement of the Cape population, he need entertain no apprehensions of his family sinking into barbarism.
The route we at this time followed ran along the middle, or skirted the western zone before alluded to, until we reached the latitude of Lake Ngami, where a totally different country begins. While in the colony, we passed through districts inhabited by the descendants of Dutch and French refugees who had fled from religious persecution. Those living near the capital differ but little from the middle classes in English counties, and are distinguished by public spirit and general intelligence; while those situated far from the centres of civilization are less informed, but are a body of frugal, industrious, and hospitable peasantry. A most efficient system of public instruction was established in the time of Governor Sir George Napier, on a plan drawn up in a great measure by that accomplished philosopher, Sir John Herschel. The system had to contend with less sectarian rancor than elsewhere; indeed, until quite recently, that spirit, except in a mild form, was unknown.
The population here described ought not to be confounded with some Boers who fled from British rule on account of the emancipation of their Hottentot slaves, and perhaps never would have been so had not every now and then some Rip Van Winkle started forth at the Cape to justify in the public prints the deeds of blood and slave-hunting in the far interior. It is therefore not to be wondered at if the whole race is confounded and held in low estimation by those who do not know the real composition of the Cape community.
Population among the Boers increases rapidly; they marry soon, are seldom sterile, and continue to have children late. I once met a worthy matron whose husband thought it right to imitate the conduct of Abraham while Sarah was barren; she evidently agreed in the propriety of the measure, for she was pleased to hear the children by a mother of what has been thought an inferior race address her as their mother. Orphans are never allowed to remain long destitute; and instances are frequent in which a tender-hearted farmer has adopted a fatherless child, and when it came of age portioned it as his own.
Two centuries of the South African climate have not had much effect upon the physical condition of the Boers. They are a shade darker, or rather ruddier, than Europeans, and are never cadaverous-looking, as descendants of Europeans are said to be elsewhere. There is a tendency to the development of steatopyga, so characteristic of Arabs and other African tribes; and it is probable that the interior Boers in another century will become in color what the learned imagine our progenitors, Adam and Eve, to have been.
The parts of the colony through which we passed were of sterile aspect; and, as the present winter had been preceded by a severe drought, many farmers had lost two thirds of their stock. The landscape was uninviting; the hills, destitute of trees, were of a dark brown color, and the scanty vegetation on the plains made me feel that they deserved the name of Desert more than the Kalahari. When first taken possession of, these parts are said to have been covered with a coating of grass, but that has disappeared with the antelopes which fed upon it, and a crop of mesembryanthemums and crassulas occupies its place. It is curious to observe how, in nature, organizations the most dissimilar are mutually dependent on each other for their perpetuation. Here the original grasses were dependent for dissemination on the grass-feeding animals, which scattered the seeds. When, by the death of the antelopes, no fresh sowing was made, the African droughts proved too much for this form of vegetation. But even this contingency was foreseen by the Omniscient One; for, as we may now observe in the Kalahari Desert, another family of plants, the mesembryanthemums, stood ready to neutralize the aridity which must otherwise have followed. This family of plants possesses seed-vessels which remain firmly shut on their contents while the soil is hot and dry, and thus preserve the vegetative power intact during the highest heat of the torrid sun; but when rain falls, the seed-vessel opens and sheds its contents just when there is the greatest probability of their vegetating. In other plants heat and drought cause the seed-vessels to burst and shed their charge.
One of this family is edible ('Mesembryanthemum edule'); another possesses a tuberous root, which may be eaten raw; and all are furnished with thick, fleshy leaves, having pores capable of imbibing and retaining moisture from a very dry atmosphere and soil, so that, if a leaf is broken during a period of the greatest drought, it shows abundant circulating sap. The plants of this family are found much farther north, but the great abundance of the grasses prevents them from making any show. There, however, they stand ready to fill up any gap which may occur in the present prevailing vegetation; and should the grasses disappear, animal life would not necessarily be destroyed, because a reserve supply, equivalent to a fresh act of creative power, has
