The streams of South Africa, like those of most tropical and sub-tropical countries, and especially where the district is mountainous, rise and fall with much greater rapidity than those of temperate climes. Their sudden rise is accounted for by the great quantity of water which in tropical storms is precipitated within a short period of time—the rain falling, not in light sparse drops, but thick and heavy, for several hours together, until the whole surface of the country is saturated, and every rivulet becomes a torrent.

Of these storms we have an exemplification in our summer thunder-showers—with their big rain-drops, when in a few minutes the gutter becomes a rivulet and the rut of the cartwheel a running stream. Fortunately these “sunshiny” showers are of short duration. They “last only half-an-hour,” instead of many hours. Fancy one of them continuing for a whole day or a week! If such were to be the case, we should witness floods as sudden and terrible as those of the tropics.

The quick fall in the streams of South Africa is easily accounted for—the principal reason being that the clouds are their feeders, and not, as with us, springs and lakes. Tropic rivers rarely run from reservoirs; the abrupt cessation of the rain cuts off their supply, and the consequence is the sudden falling of their waters. Evaporation by a hot sun, and large absorption by the dry earth, combine to produce this effect. Now the young yägers saw that the “Gareep” (such is the native name of the Orange River) had fallen many feet during the night; but they knew not whether it was yet fordable. Though the place was a “drift” used by Hottentots, Bechuanas, traders, and occasionally “trek-boors,” yet none of the party knew any thing of its depth, now that the freshet was on. There were no marks to indicate the depth—no means by which they could ascertain it. They could not see the bottom, as the water was of a yellow-brown colour, in consequence of the flood. It might be three feet—it might be six—but as the current was very rapid, it would be a dangerous experiment to wade in and measure its depth in that way.

What were they to do then? They were impatient to effect a crossing. How were they to do so in safety?

Hendrik proposed that one of them should try the ford on horseback. If they could not wade it, they might swim over. He offered to go himself. Groot Willem, not to be outdone by Hendrik in daring, made a similar proposal. But Hans, who was the eldest of the party, and whose prudent counsels were usually regarded by all, gave his advice against this course. The experiment would be too perilous, he said. Should the water prove too deep, the horses would be compelled to swim, and with so rapid a current they might be carried far below the “drift,”—perhaps down to where the banks were high and steep. There they should not be able to climb out, and both horse and rider might perish.

Besides, urged Hans, even should a rider succeed by swimming to reach the opposite side in safety, the oxen and wagons could not get over in that way, and where would be the use of crossing without them? None whatever. Better, therefore, to wait a little longer until they should be certain that the river had subsided to its usual level. That they could ascertain by the water ceasing to fall any further, and another day would decide the point. It would only be the loss of another day.

Hans’s reasoning was good, and so was his counsel. Hendrik and Groot Willem acknowledged this, and agreed to act upon it; but for all that, Groot Willem, who was longing to get among the giraffes, buffaloes, and elephants, felt a strong desire to attempt the crossing; and Hendrik, too, was similarly inclined, from the sheer love of adventure—for Hendrik’s fault was that of being over-courageous.

Both would have risked the river—even to swimming it—had it been practicable for the teams to have crossed, but as that was not believed possible, they agreed, though with rather a bad grace, to wait upon the water another day.

But, after all, they were not to wait a day,—scarcely an hour. In an hour from that time they had crossed the drift—wagons, oxen, and all—and were trekking over the plain on the opposite side!

What had led to their so suddenly changing their resolution? How had they ascertained that the drift was fordable? For a knowledge of that fact they were indebted to Congo the Kaffir.