He evaded a sentinel, passed the out-guard and support, and by devious ways came again to Colonel Capell's headquarters, where he appeared before the officers gathered there as a disembodied spirit materializing out of thin air.

When they saw who it was that came thus unannounced they smiled and the colonel scratched his head in perplexity.

"Someone should be shot for this," he said. "I might just as well not establish an out-post if a man can filter through whenever he pleases."

Tarzan smiled. "Do not blame them," he said, "for I am not a man. I am Tarmangani. Any Mangani who wished to, could enter your camp almost at will; but if you have them for sentinels no one could enter without their knowledge."

"What are the Mangani?" asked the colonel. "Perhaps we might enlist a bunch of the beggars."

Tarzan shook his head. "They are the great apes," he explained; "my people; but you could not use them. They cannot concentrate long enough upon a single idea. If I told them of this they would be much interested for a short time-I might even hold the interest of a few long enough to get them here and explain their duties to them; but soon they would lose interest and when you needed them most they might be off in the forest searching for beetles instead of watching their posts. They have the minds of little children—that is why they remain what they are."

"You call them Mangani and yourself Tarmangani—what is the difference?" asked Major Preswick.

"Tar means white," replied Tarzan, "and Mangani, great ape. My name—the name they gave me in the tribe of Kerchak—means White-skin. When I was a little balu my skin, I presume, looked very white indeed against the beautiful, black coat of Kala, my foster mother and so they called me Tarzan, the Tarmangani. They call you, too, Tarmangani," he concluded, smiling.

Capell smiled. "It is no reproach, Greystoke," he said; "and, by Jove, it would be a mark of distinction if a fellow could act the part. And now how about your plan? Do you still think you can empty the trench opposite our sector?"

"Is it still held by Gomangani?" asked Tarzan.

"What are Gomangani?" inquired the colonel. "It is still held by native troops, if that is what you mean."

"Yes," replied the ape-man, "the Gomangani are the great black apes—the Negroes."

"What do you intend doing and what do you want us to do?" asked Capell.

Tarzan approached the table and placed a finger on the map. "Here is a listening post," he said; "they have a machine gun in it. A tunnel connects it with this trench at this point." His finger moved from place to place on the map as he talked. "Give me a bomb and when you hear it burst in this listening post let your men start across No Man's Land slowly. Presently they will hear a commotion in the enemy trench; but they need not hurry, and, whatever they do, have them come quietly. You might also warn them that I may be in the trench and that I do not care to be shot or bayoneted."

"And that is all?" queried Capell, after directing an officer to give Tarzan a hand grenade; "you will empty the trench alone?"

"Not exactly alone," replied Tarzan with a grim smile; "but I shall empty it, and, by the way, your men may come in through the tunnel from the listening post if you prefer. In about half an hour, Colonel," and he turned and left them.

As he passed through the camp there flashed suddenly upon the screen of recollection, conjured there by some reminder of his previous visit to headquarters, doubtless, the image of the officer he had passed as he quit the colonel that other time and simultaneously recognition of the face that had been revealed by the light from the fire. He shook his head dubiously. No, it could not be and yet the features of the young officer were identical with those of Fraulein Kircher, the German spy he had seen at German headquarters the night he took Major Schneider from under the nose of the Hun general and his staff.

Beyond the last line of sentinels Tarzan moved quickly in the direction of Numa, the lion. The beast was lying down as Tarzan approached, but he rose as the ape-man reached his side. A low whine escaped his muzzled lips. Tarzan smiled for he recognized in the new note almost a supplication—it was more like the whine of a hungry dog begging for food than the voice of the proud king of beasts.

"Soon you will kill—and feed," he murmured in the vernacular of the great apes.

He unfastened the rope from about the tree and, with Numa close at his side, slunk into No Man's Land. There was little rifle fire and only an occasional shell vouched for the presence of artillery behind the opposing lines. As the shells from both sides were falling well back of the trenches, they constituted no menace to Tarzan; but the noise of them and that of the rifle fire had a marked effect upon Numa who crouched, trembling, close to the Tarmangani as though seeking protection.

Cautiously the two beasts moved forward toward the listening post of the Germans. In one hand Tarzan carried the bomb the English had given him, in the other was the coiled rope attached to the lion.