a cat Tarzan ran up the cliff for thirty feet before he paused, and there finding a secure foothold, he stopped and looked down upon Numa who was leaping upward in a wild and futile attempt to scale the rocky wall to his prey. Fifteen or twenty feet from the ground the lion would scramble only to fall backward again defeated. Tarzan eyed him for a moment and then commenced a slow and cautious ascent toward the summit. Several times he had difficulty in finding holds but at last he drew himself over the edge, rose, picked up a bit of loose rock, hurled it at Numa and strode away.
Finding an easy descent to the gorge, he was about to pursue his journey in the direction of the still-booming guns when a sudden thought caused him to halt and a half-smile to play about his lips. Turning, he trotted quickly back to the outer opening of Numa's tunnel. Close beside it he listened for a moment and then rapidly began to gather large rocks and pile them within the entrance. He had almost closed the aperture when the lion appeared upon the inside—a very ferocious and angry lion that pawed and clawed at the rocks and uttered mighty roars that caused the earth to tremble; but roars did not frighten Tarzan of the Apes. At Kala's shaggy breast he had closed his infant eyes in sleep upon countless nights in years gone by to the savage chorus of similar roars. Scarcely a day or night of his jungle life—and practically all his life had been spent in the jungle—had he not heard the roaring of hungry lions, or angry lions, or love-sick lions. Such sounds affected Tarzan as the tooting of an automobile horn may affect you—if you are in front of the automobile it warns you out of the way, if you are not in front of it you scarcely notice it. Figuratively Tarzan was not in front of the automobile—Numa could not reach him and Tarzan knew it, so he continued deliberately to choke the entrance until there was no possibility of Numa's getting out again. When he was quite through he made a grimace at the hidden lion beyond the barrier and resumed his way toward the east. "A man-eater who will eat no more men," he soliloquized.
That night Tarzan lay up under an overhanging shelf of rock. The next morning he resumed his journey, stopping only long enough to make a kill and satisfy his hunger. The other beasts of the wild eat and lie up; but Tarzan never let his belly interfere with his plans. In this lay one of the greatest differences between the ape-man and his fellows of the jungles and forests. The firing ahead rose and fell during the day. He had noticed that it was highest at dawn and immediately after dusk and that during the night it almost ceased. In the middle of the afternoon of the second day he came upon troops moving up toward the front. They appeared to be raiding parties, for they drove goats and cows along with them and there were native porters laden with grain and other foodstuffs. He saw that these natives were all secured by neck chains and he also saw that the troops were composed of native soldiers in German uniforms. The officers were white men. No one saw Tarzan, yet he was here and there about and among them for two hours. He inspected the insignia upon their uniforms and saw that they were not the same as that which he had taken from one of the dead soldiers at the bungalow and then he passed on ahead of them, unseen in the dense bush. He had come upon Germans and had not killed them; but it was because the killing of Germans at large was not yet the prime motive of his existence—now it was to discover the individual who slew his mate.
After he had accounted for him he would take up the little matter of slaying ALL Germans who crossed his path, and he meant that many should cross it, for he would hunt them precisely as professional hunters hunt the man-eaters.
As he neared the front lines the troops became more numerous. There were motor trucks and ox teams and all the impedimenta of a small army and always there were wounded men walking or being carried toward the rear. He had crossed the railroad some distance back and judged that the wounded were being taken to it for transportation to a base hospital and possibly as far away as Tanga on the coast.
It was dusk when he reached a large camp hidden in the foothills of the Pare Mountains. As he was approaching from the rear he found it but lightly guarded and what sentinels there were, were not upon the alert, and so it was an easy thing for him to enter after darkness had fallen and prowl about listening at the backs of tents, searching for some clew to the slayer of his mate.
As he paused at the side of a tent before which sat a number of native soldiers he caught a few words spoken in native dialect that riveted his attention instantly: "The Waziri fought like devils; but we are greater fighters and we killed them all. When we were through the captain came and killed the woman. He stayed outside and yelled in a very loud voice until all the men were killed. Underlieutenant von Goss is braver—he came in and stood beside the door shouting at us, also in a very loud voice, and bade us nail one of the Waziri who was wounded to the wall, and then he laughed loudly because the man suffered. We all laughed. It was very funny."
Like a beast of prey, grim and terrible, Tarzan crouched in the shadows beside the tent. What thoughts passed through that savage mind? Who may say? No outward sign of passion was revealed by the expression of the handsome face; the cold, gray eyes denoted only intense watchfulness. Presently the soldier Tarzan had heard first rose and with a parting word turned away. He passed within ten feet of the ape-man and continued on toward the rear of the camp. Tarzan followed and in the shadows of a clump of bushes overtook his quarry. There was no sound as the man beast sprang upon the back of his prey and bore it to the ground for steel fingers closed simultaneously upon the soldier's throat, effectually stifling any outcry. By the neck Tarzan dragged his victim well into the concealment of the bushes.
"Make no sound," he cautioned in the man's own tribal dialect as he released his hold upon the other's throat.
The fellow gasped for breath, rolling frightened eyes upward to see what manner of creature it might be in whose power he was. In the darkness he saw only a naked brown body bending above him; but he still remembered the terrific strength of the mighty muscles that had closed upon his wind and dragged him into the bushes as though he had been but a little child. If any thought of resistance had crossed his mind he must have discarded it at once, as he made no move to escape.
"What is the name of the officer who killed the woman at the bungalow where you fought with the Waziri?" asked Tarzan.
"Hauptmann Schneider," replied the black when he could again command his voice.
"Where is he?" demanded the ape-man.
"He is here. It may be that he is at headquarters. Many of the officers go there in the evening to receive orders."
"Lead me there," commanded Tarzan, "and if I am discovered I will kill you immediately. Get up!"
The black rose and led the way by a roundabout route back through the camp. Several times they were forced to hide while soldiers passed; but at last they reached a great pile of baled hay from about the corner of which the black pointed out a two-story building in the distance.
"Headquarters," he said. "You can go no farther unseen. There are many soldiers about."
Tarzan realized that he could not proceed farther in company with the black. He turned and looked at the fellow for a moment as though pondering what disposition to make of him.
"You helped to crucify Wasimbu, the Waziri," he accused in a low yet none the less terrible tone.
The black trembled, his knees giving beneath him. "He ordered us to do it," he plead.
"Who ordered it done?" demanded Tarzan.
"Underlieutenant von Goss," replied the soldier. "He, too, is here."
"I shall find him," returned Tarzan, grimly. "You helped to crucify Wasimbu, the Waziri, and, while he suffered, you laughed."
The fellow reeled. It was as though in the accusation he read also his death sentence. With no other word Tarzan seized the man again by the neck. As before there was no outcry. The giant muscles tensed. The arms swung quickly upward and with them the body of the black soldier who had helped to crucify Wasimbu, the Waziri, described a circle in the air—once, twice, three times, and then it was flung aside and the ape-man turned in the direction of General Kraut's headquarters.
A single sentinel in the rear of the building barred the way. Tarzan crawled, belly to the ground, toward him, taking advantage of cover as only the jungle-bred beast of prey can do. When the sentinel's eyes were toward him, Tarzan