But here there was a marked difference. There were indications of erosion. The grim walls were scarred and water-worn. Towers and turrets and minarets, carved from the native granite, pointed upward from below, but they clung close to the canyon's wall, and just beyond them he could see the broad expanse of the floor of the canyon, which from his great height above it appeared as level as a billiard table. The scene held him in a hypnosis of wonderment and admiration as, at first swiftly and then slowly, his eyes encompassed the whole astounding scene. Perhaps a mile below him lay the floor of the sunken canyon, the further wall of which he could but vaguely estimate to be somewhere between fifteen and twenty miles to the north, and this he realized was the lesser dimension of the canyon. Upon his right, to the east, and upon his left, to the west, he could see that the canyon extended to considerable distances--just how far he could not guess. He thought that to the east he could trace the wall that hemmed it upon that side, but from where he stood the entire extent of the canyon to the west was not visible, yet he knew that the floor that was visible to him must stretch fully twenty-five or thirty miles from east to west. Almost below him was a large lake or marsh that seemed to occupy the greater part of the east end of the canyon. He could see lanes of water winding through what appeared to be great growths of reeds and, nearer the northern shore, a large island. Three streams, winding ribbons far below, emptied into the lake, and in the far distance was another ribbon that might be a road. To the west the canyon was heavily wooded, and between the forest and the lake he saw moving figures of what he thought to be grazing game. The sight below him aroused the enthusiasm of the explorer to its highest pitch. Here, doubtless, lay the secret of The Lost Tribe of the Wiramwazi and how well Nature had guarded this secret with stupendous barrier cliffs, aided by the superstitions of the ignorant black inhabitants of the outer slopes, was now easily understandable. As far as he could see, the cliffs seemed sheer and impossible of descent, and yet he knew that he must find a way--that he would find a way down into that valley of enchantment. Moving slowly along the rim he sought some foothold, however slight, where Nature had lowered her guard, but it was almost night and he had covered but a short distance before he found even a suggestion of hope that the canyon was hemmed at any point by other than unbroken cliffs, whose perpendicular faces rose at their lowest point fully a thousand feet above any possible foothold for a human being.