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The water, which is almost always very rapid in them, dug out the sand beneath our feet in a second or two, and we were all sinking by that means so deep that we were glad to relinquish the attempt to ford it before we got half way over; the oxen were carried away down into the Zambesi. These sand-rivers remove vast masses of disintegrated rock before it is fine enough to form soil.
It was sixty or seventy yards wide, and waist-deep. Like all these sand-rivers, it is for the most part dry; but by digging down a few feet, water is to be found, which is percolating along the bed on a stratum of clay. This is the phenomenon which is dignified by the name of "a river flowing under ground."
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