From time to time he noted, with sinking heart, ledges just above them from which Sheeta might spring down upon them; and the way was a way of terror for little Nkima.

Now they had come to a particularly precarious point upon the mountainside. A sheer cliff rose above them on their right and at their left the mountainside fell away so steeply that as Tarzan advanced his body was pressed closely against the granite face of the cliff as he sought a foothold upon the ledge of loose rubble. Just ahead of them the cliff shouldered out boldly against the distant skies. Perhaps beyond that clear-cut corner the going might be better. If it should develop that it was worse, Tarzan realized that he must turn back.

At the turn where the footing was narrowest a stone gave beneath Tarzan's foot, throwing him off his balance for an instant and at that same instant Nkima, thinking that Tarzan was falling, shrieked and leaped from his shoulder, giving the ape-man's body just the impetus that was required to overbalance it entirely.

The mountainside below was steep, though not perpendicular, and if Nkima had not pushed the ape-man outward he doubtless would have slid but a short distance before being able to stay his fall, but as it was he lunged headforemost down the embankment, rolling and tumbling for a short distance over the loose rock until his body was brought to a stop by one of the many stunted trees that clung tenaciously to the wind-swept slope.

Terrified, Nkima scampered to his master's side. He screamed and chattered in his ear and pulled and tugged upon him in an effort to raise him, but the ape-man lay motionless, a tiny stream of blood trickling from a cut on his temple into his shock of black hair.

As Nkima mourned, the warriors, who had been watching them from below, clambered quickly up the mountainside toward him and his helpless master.

Chapter Four

As Erich von Harben turned to face the thing that he had heard approaching behind him, he saw a Negro armed with a rifle coming toward him.

"Gabula!" exclaimed the white man, lowering his weapon. "What are you doing here?"

"Bwana," said the warrior, "I could not desert you. I could not leave you to die alone at the hands of the spirits that dwell upon these mountains."

Von Harben eyed him incredulously. "But if you believe that, Gabula, are you not afraid that they will kill you, too?"

"I expect to die, Bwana," replied Gabula. "I cannot understand why you were not killed the first night or the second night. We shall both surely be killed tonight."

"And yet you followed me! Why?"

"You have been kind to me, Bwana," replied the man. "Your father has been kind to me. When the others talked they filled me with fear and when they ran away I went with them, but I have come back. There was nothing else that I could do, was there?"

"No, Gabula. For you or for me there would have been nothing else to do, as we see such things, but as the others saw them they found another thing to do and they did it."

"Gabula is not as the others," said the man, proudly. "Gabula is a Batoro."

"Gabula is a brave warrior," said von Harben. "I do not believe in spirits and so there was no reason why I should be afraid, but you and all your people do believe in them and so it was a very brave thing for you to come back, but I shall not hold you. You may return, Gabula, with the others."

"Yes?" Gabula exclaimed eagerly. "The Bwana is going back? That will be good. Gabula will go back with him."

"No, I am going down into that canyon," said von Harben, pointing over the rim.

Gabula looked down, surprise and wonder reflected by his wide eyes and parted lips.

"But, Bwana, even if a human being could find a way down these steep cliffs, where there is no place for either hand or foot, he would surely be killed the moment he reached the bottom, for this indeed must be the Land of The Lost Tribe where the spirits of the dead live in the heart of the Wiramwazi."

"You do not need to come with me, Gabula," said von Harben. "Go back to your people."

"How are you going to get down there?" demanded the Negro.

"I do not know just how, or where, or when. Now I am going to descend as far along this fissure as I can go. Perhaps I shall find my way down here, perhaps not."

"But suppose there is no foothold beyond the fissure?" asked Gabula.

"I shall have to find footing."

Gabula shook his head. "And if you reach the bottom, Bwana, and you are right about the spirits and there are none or they do not kill you, how will you get out again?"

Von Harben shrugged his shoulders and smiled. Then he extended his hand. "Goodby, Gabula," he said. "You are a brave man."

Gabula did not take the offered hand of his master. "I am going with you," he said, simply.

"Even though you realize that should we reach the bottom alive we may never be able to return?"

"Yes."

"I cannot understand you, Gabula. You are afraid and I know that you wish to return to the village of your people. Then why do you insist on coming with me when I give you leave to return home?"

"I have sworn to serve you, Bwana, and I am a Batoro," replied Gabula.

"And I can only thank the Lord that you are a Batoro," said von Harben, "for the Lord knows that I shall need help before I reach the bottom of this canyon, and we must reach it, Gabula, unless we are content to die by starvation."

"I have brought food," said Gabula.