The lolling plateau ceased abruptly at his feet, and below him, stretching far to the distant hills, lay a great abyss--a mighty canyon similar to that which has made the gorge of the Colorado world-famous.

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 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.

The sun had already set when he discovered a narrow fissure in the granite wall. Crumbled fragments of the mother rock had fallen into and partially filled it so that near the surface, at least, it offered a means of descent below the level of the cliff top, but in the gathering darkness he could not determine how far downward this rough and precarious pathway led.

He could see that below him the cliffs rose in terraced battlements to within a thousand feet of where he stood, and if the narrow fissure extended to the next terrace below him, he felt that the obstacles thereafter would present fewer difficulties than those that had baffled him up to the present time--for while he would still have some four thousand feet to descend, the formation of the cliffs was much more broken at the foot of the first sheer drop and consequently might be expected to offer some avenues of descent of which an experienced mountain climber could take advantage.

Hungry and cold, he sat beneath the descending night, gazing down into the blackening void below. Presently, as the darkness deepened, he saw a light twinkling far below and then another and another and with each his excitement rose, for he knew that they marked the presence of man. In many places upon the marsh-like lake he saw the fires twinkling, and at a point which he took to mark the site of the island there were many lights.

What sort of men were they who tended these fires? Would he find them friendly or hostile? Were they but another tribe of Africans, or could it be that the old legend was based upon truth and that far below him white men of The Lost Tribe cooked their evening meals above those tantalizing fires of mystery?

What was that? Von Harben strained his ears to catch the faint suggestion of a sound that arose out of the shadowy abyss below--a faint, thin sound that barely reached his ears, but he was sure that he could not be mistaken--the sound was the voices of men.

And now from out of the valley came the scream of a beast and again a roar that rumbled upward like distant thunder. To the music of these sounds, von Harben finally succumbed to exhaustion; sleep for the moment offering him relief from cold and hunger.

When morning came he gathered wood from the stunted trees near by and built a fire to warm himself. He had no food, nor all the previous day since he had reached the summit had he seen any sign of a living creature other than the game a mile beneath him on the verdant meadows of the canyon bottom.

He knew that he must have food and have it soon and food lay but a mile away in one direction. If he sought to circle the canyon in search of an easier avenue of descent, he knew that he might not find one in the hundred miles or more that he must travel. Of course he might turn back. He was sure that he could reach the base of the outer slopes of the Wiramwazi, where he knew that game might be found before exhaustion overcame him, but he had no mind to turn back and the thought of failure was only a vague suggestion that scarcely ever rose above the threshold of his conscious mind.

Having warmed himself before the fire, he turned to examine the fissure by the full light of day. As he stood upon its brink he could see that it extended downward for several hundred feet, but there it disappeared. However, he was by no means sure that it ended, since it was not a vertical cleft, but tilted slightly from the perpendicular.

From where he stood he could see that there were places in the fissure where descent would be just possible, though it might be very difficult to reascend. He knew, therefore, that should he reach the bottom of the fissure and find that further descent was impossible he would be caught in a trap from which there might be no escape.

Although he felt as fit and strong as ever, he realized perfectly that the contrary was the fact and that his strength must be ebbing and that it would continue to ebb still more rapidly the longer that he was forced to expend it in arduous efforts to descend the cliff and without any possibility of rebuilding it with food.

Even to Erich von Harben, young, self-confident and enthusiastic, his next step seemed little better than suicidal. To another the mere idea of attempting the descent of these towering cliffs would have seemed madness, but in other mountains von Harben had always found a way, and with this thin thread upon which to hang his hopes he faced the descent into the unknown. Now he was just about to lower himself over the edge of the fissure when he heard the sounds of footsteps behind him. Wheeling quickly, he drew his Luger.

Chapter Three

LITTLE NKIMA came racing through the tree tops, jabbering excitedly, and dropped to the knee of Tarzan of the Apes where the latter lay stretched upon the great branch of a jungle giant, his back against the rough bole, where he was lying up after making a kill and feeding.

"Gomangani! Gomangani!" shrilled Nkima. "They come! They come!"

"Peace," said Tarzan. "You are a greater nuisance than all the Gomangani in the jungle."

"They will kill little Nkima," cried the monkey. "They are strange Gomangani, and there are no Tarmangani among them."

"Nkima thinks everything wants to kill him," said Tarzan, "and yet he has lived many years and is not dead yet."

"Sabor and Shetta and Numa, the Gomangani, had Histah the snake like to eat poor little Nkima," walled the monkey. "That is why he is afraid."

"Do not fear, Nkima," said the ape-man. "Tarzan will let no one hurt you."

"Go and see the Gomangani," urged Nkima.