Another good specimen of the ancient fountains is in a cave near Kolobeng, called "_Lepélolé_," a word by which the natives there sometimes designate the sea. The wearing power of the primeval waters is here easily traced in two branches--the upper or more ancient ending in the characteristic oval orifice, in which I deposited a Father Mathew's leaden temperance token: the lower branch is much the largest, as that by which the greatest amount of water flowed for a much longer period than the other. The cave Lepélolé was believed to be haunted, and no one dared to enter till I explored it as a relief from more serious labour. The entrance is some eight or more feet high, and five or six wide, in reddish grey sandstone rock, containing in its substance banks of well rounded shingle. The whole range, with many of the adjacent hills on the south, bear evidence of the scorching to which the contiguity of the lava subjected them. In the hardening process the silica was sometimes sweated out of this rock, and it exists now as pretty efflorescences of well-shaped crystals. But not only does this range, which stands eight or ten miles north of Kolobeng, exhibit the effects of igneous action, it shows on its eastern slope the effects of flowing water, in a large pot-hole called Löe, which has the reputation of having given exit to all the animals in South Africa, and also to the first progenitors of the whole Bechuana race. Their footsteps attest the truth of this belief. I was profane enough to be sceptical, because the large footstep of the first man Matsieng was directed as if going into instead of out of this famous pot-hole. Other huge pot-holes are met with all over the country, and at heights on the slopes of the mountains far above the levels of the ancient rivers. Many fountains rose in the courses of the ancient river beds, and the outflow was always in the direction of the current of the parent stream. Many of these ancient fountains still contain water, and form the stages on a journey, but the primitive waters seem generally to have been laden with lime in solution: this lime was deposited in vast lakes, which are now covered with calcareous tufa. One enormous fresh-water lake, in which probably sported the Dyconodon, was let off when the remarkable rent was made in the basalt which now constitutes the Victoria Falls. Another seems to have gone to the sea when a similar fissure was made at the falls of the Orange River. It is in this calcareous tufa alone that fossil animal remains have yet been found. There are no marine limestones except in friths which the elevation of the west and east coasts have placed far inland in the Coanza and Somauli country, and these contain the same shells as now live in the adjacent seas.