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.