As Tarzan approached the plane Numa walked at his side, and when Tarzan stopped and looked up at the girl and the man Numa stopped also.

"I had about given up hope of finding you," said the ape-man, "and it is evident that I found you just in time."

"But how did you know we were in trouble?" asked the English officer.

"I saw your plane fall," replied Tarzan. "I was watching you from a tree beside the clearing where you took off. I didn't have much to locate you by other than the general direction, but it seems that you volplaned a considerable distance toward the south after you disappeared from my view behind the hills. I have been looking for you further toward the north. I was just about to turn back when I heard your pistol shot. Is your ship beyond repair?"

"Yes," replied Smith-Oldwick, "it is hopeless."

"What are your plans, then? What do you wish to do?" Tarzan directed his question to the girl.

"We want to reach the coast," she said, "but it seems impossible now."

"I should have thought so a little while ago," replied the ape-man, "but if Numa is here there must be water within a reasonable distance. I ran across this lion two days ago in the Wamabo country. I liberated him from one of their pits. To have reached this spot he must have come by some trail unknown to me-at least I crossed no game trail and no spoor of any animal after I came over the hills out of the fertile country. From which direction did he come upon you?"

"It was from the south," replied the girl. "We thought, too, that there must be water in that direction."

"Let's find out then," said Tarzan.

"But how about the lion?" asked Smith-Oldwick.

"That we will have to discover," replied the ape-man, "and we can only do so if you will come down from your perch."

The officer shrugged his shoulders. The girl turned her gaze upon him to note the effect of Tarzan's proposal. The Englishman grew suddenly very white, but there was a smile upon his lips as without a word he slipped over the edge of the plane and clambered to the ground behind Tarzan.

Bertha Kircher realized that the man was afraid nor did she blame him, and she also realized the remarkable courage that he had shown in thus facing a danger that was very real to him.

Numa standing close to Tarzan's side raised his head and glared at the young Englishman, growled once, and looked up at the ape-man. Tarzan retained a hold upon the beast's mane and spoke to him in the language of the great apes. To the girl and Smith-Oldwick the growling gutturals falling from human lips sounded uncanny in the extreme, but whether Numa understood them or not they appeared to have the desired effect upon him, as he ceased growling, and as Tarzan walked to Smith-Oldwick's side Numa accompanied him, nor did he offer to molest the officer.

"What did you say to him?" asked the girl.

Tarzan smiled. "I told him," he replied, "that I am Tarzan of the Apes, mighty hunter, killer of beasts, lord of the jungle, and that you are my friends. I have never been sure that all of the other beasts understand the language of the Mangani. I know that Manu, the monkey, speaks nearly the same tongue and I am sure that Tantor, the elephant, understands all that I say to him. We of the jungle are great boasters. In our speech, in our carriage, in every detail of our demeanor we must impress others with our physical power and our ferocity. That is why we growl at our enemies. We are telling them to beware or we shall fall upon them and tear them to pieces. Perhaps Numa does not understand the words that I use but I believe that my tones and my manner carry the impression that I wish them to convey. Now you may come down and be introduced."

It required all the courage that Bertha Kircher possessed to lower herself to the ground within reach of the talons and fangs of this untamed forest beast, but she did it. Nor did Numa do more than bare his teeth and growl a little as she came close to the ape-man.

"I think you are safe from him as long as I am present," said the ape-man. "The best thing to do is simply to ignore him. Make no advances, but be sure to give no indication of fear and, if possible always keep me between you and him. He will go away presently I am sure and the chances are that we shall not see him again."

At Tarzan's suggestion Smith-Oldwick removed the remaining water and provisions from the plane and, distributing the burden among them, they set off toward the south. Numa did not follow them, but stood by the plane watching until they finally disappeared from view around a bend in the gorge.

Tarzan had picked up Numa's trail with the intention of following it southward in the belief that it would lead to water. In the sand that floored the bottom of the gorge tracks were plain and easily followed. At first only the fresh tracks of Numa were visible, but later in the day the ape-man discovered the older tracks of other lions and just before dark he stopped suddenly in evident surprise. His two companions looked at him questioningly, and in answer to their implied interrogations he pointed at the ground directly in front of him.

"Look at those," he exclaimed.

At first neither Smith-Oldwick nor the girl saw anything but a confusion of intermingled prints of padded feet in the sand, but presently the girl discovered what Tarzan had seen, and an exclamation of surprise broke from her lips.

"The imprint of human feet!" she cried.

Tarzan nodded.

"But there are no toes," the girl pointed out.

"The feet were shod with a soft sandal," explained Tarzan.

"Then there must be a native village somewhere in the vicinity," said Smith-Oldwick.

"Yes," replied the ape-man, "but not the sort of natives which we would expect to find here in this part of Africa where others all go unshod with the exception of a few of Usanga's renegade German native troops who wear German army shoes. I don't know that you can notice it, but it is evident to me that the foot inside the sandal that made these imprints were not the foot of a Negro. If you will examine them carefully you will notice that the impression of the heel and ball of the foot are well marked even through the sole of the sandal. The weight comes more nearly in the center of a Negro's footprint."

"Then you think these were made by a white person?"

"It looks that way," replied Tarzan, and suddenly, to the surprise of both the girl and Smith-Oldwick, he dropped to his hands and knees and sniffed at the tracks-again a beast utilizing the senses and woodcraft of a beast. Over an area of several square yards his keen nostrils sought the ident.i.ty of the makers of the tracks. At length he rose to his feet.

"It is not the spoor of the Gomangani," he said, "nor is it exactly like that of white men. There were three who came this way. They were men, but of what race I do not know."

There was no apparent change in the nature of the gorge except that it had steadily grown deeper as they followed it downward until now the rocky and precipitous sides rose far above them. At different points natural caves, which appeared to have been eroded by the action of water in some forgotten age, pitted the side walls at various heights. Near them was such a cavity at the ground's level-an arched cavern floored with white sand. Tarzan indicated it with a gesture of his hand.

"We will lair here tonight," he said, and then with one of his rare, slow smiles: "We will CAMP here tonight."

Having eaten their meager supper Tarzan bade the girl enter the cavern.

"You will sleep inside," he said. "The lieutenant and I will lie outside at the entrance."

Chapter XVI

The Night Attack

As the girl turned to bid them good night, she thought that she saw a shadowy form moving in the darkness beyond them, and almost simultaneously she was sure that she heard the sounds of stealthy movement in the same direction.

"What is that?" she whispered. "There is something out there in the darkness."

"Yes," replied Tarzan, "it is a lion. It has been there for some time. Hadn't you noticed it before?"

"Oh!" cried the girl, breathing a sigh of relief, "is it our lion?"

"No," said Tarzan, "it is not our lion; it is another lion and he is hunting."

"He is stalking us?" asked the girl.

"He is," replied the ape-man. Smith-Oldwick fingered the grip of his pistol.

Tarzan saw the involuntary movement and shook his head.

"Leave that thing where it is, Lieutenant," he said.

The officer laughed nervously. "I couldn't help it, you know, old man," he said; "instinct of self-preservation and all that."

"It would prove an instinct of self-destruction," said Tarzan. "There are at least three hunting lions out there watching us. If we had a fire or the moon were up you would see their eyes plainly. Presently they may come after us but the chances are that they will not. If you are very anxious that they should, fire your pistol and hit one of them."