It could not be seen what became of the vast body of water, until the explorer had crept up the dizzy edge of the chasm from below, and peeped over into the dark gulf. The river, more than a mile in width, precipitated itself sheer down into a rent extending at right angles across its bed. The walls of the precipice were as cleanly cut as if done by a knife, and no projecting crag broke the sheet of falling waters. Four rocks, or rather small islands, on the edge of the falls divide them into five separate cascades, and in front of each fall rises one of the tall pillars of smoke which are visible in time of flood at a distance of ten miles. Only at low water can the island on which Livingstone stood be approached, for when the river is high any attempt to reach it would result in a plunge into the abyss below. Against the black wall of the precipice opposite the falls two, three, and sometimes four rainbows, each forming three fourths of an arc, are painted on the ascending clouds of spray, which continually rush up from the depths below. A fine rain is constantly falling from these clouds, and the cliffs are covered with dense, dripping vegetation. But the great sight is the cataract itself. The rent in the rocks seems to be of comparatively recent formation, for their edges are worn back only about three feet. [Illustration: VICTORIA FALLS, OR MOZI-OA-TUNIA.] Since Livingstone’s first visit, the falls have been more minutely examined by other explorers, so that we now know more accurately their dimensions and leading features. The breadth of the river at the falls has been ascertained to be over 1860 yards, and the depth of the precipice below the island 360 feet, or twice that of Niagara. At the bottom of the rent, all the waters that have come over the falls rush together in the centre of the gulf immediately beneath the island where, confined in a space of twenty or thirty yards, they form a fearful boiling whirlpool. From this a stream flows through the narrow channel at right angles to the course above and, turning a sharp corner, emerges into another chasm parallel with the first; then through another confined gap to a third chasm; and so backward and forward in wild confusion through forty miles of hills, until it breaks out into the level country of the lower Zambesi. The rush of the river through this inaccessible ravine is not so turbulent as might be imagined from its being pent in between walls less than forty yards apart. It pushes its way with a crushing, grinding motion, sweeping around the sharp corners with a swift resistless ease that indicates plainly a great depth of water. It was through this gap, caused by some unrecorded convulsion of the earth, that the great lake which must have at one time occupied South Central Africa, has been drained, and it forms undoubtedly the most wonderful natural feature in Africa, if not in the world.