Numa, the lion, came steadily toward them; his attitude seemed more that of curiosity than of belligerency. Close to the side of the ship he stopped and stood gazing up at them.
"Magnificent, isn't he?" exclaimed the man.
"I never saw a more beautiful creature," she replied, "nor one with such a dark coat. Why, he is almost black."
The sound of their voices seemed not to please the lord of the jungle, for he suddenly wrinkled his great face into deep furrows as he bared his fangs beneath snarling lips and gave vent to an angry growl. Almost simultaneously he crouched for a spring and immediately Smith-Oldwick discharged his pistol into the ground in front of the lion. The effect of the noise upon Numa seemed but to enrage him further, and with a horrid roar he sprang for the author of the new and disquieting sound that had outraged his ears.
Simultaneously Lieutenant Harold Percy Smith-Oldwick vaulted nimbly out of the cockpit on the opposite side of his plane, calling to the girl to follow his example. The girl, realizing the futility of leaping to the ground, chose the remaining alternative and clambered to the top of the upper plane.
Numa, unaccustomed to the idiosyncrasies of construction of an airship and having gained the forward cockpit, watched the girl clamber out of his reach without at first endeavoring to prevent her. Having taken possession of the plane his anger seemed suddenly to leave him and he made no immediate move toward following Smith-Oldwick. The girl, realizing the comparative safety of her position, had crawled to the outer edge of the wing and was calling to the man to try and reach the opposite end of the upper plane.
It was this scene upon which Tarzan of the Apes looked as he rounded the bend of the gorge above the plane after the pistol shot had attracted his attention. The girl was so intent upon watching the efforts of the Englishman to reach a place of safety, and the latter was so busily occupied in attempting to do so that neither at once noticed the silent approach of the ape-man.
It was Numa who first noticed the intruder. The lion immediately evinced his displeasure by directing toward him a snarling countenance and a series of warning growls. His action called the attention of the two upon the upper plane to the newcomer, eliciting a stifled "Thank God!" from the girl, even though she could scarce credit the evidence of her own eyes that it was indeed the savage man, whose presence always assured her safety, who had come so providentially in the nick of time.
Almost immediately both were horrified to see Numa leap from the cockpit and advance upon Tarzan. The ape-man, carrying his stout spear in readiness, moved deliberately onward to meet the carnivore, which he had recognized as the lion of the Wamabos' pit. He knew from the manner of Numa's approach what neither Bertha Kircher nor Smith-Oldwick knew—that there was more of curiosity than belligerency in it, and he wondered if in that great head there might not be a semblance of gratitude for the kindness that Tarzan had done him.
There was no question in Tarzan's mind but that Numa recognized him, for he knew his fellows of the jungle well enough to know that while they oft-times forgot certain sensations more quickly than man there are others which remain in their memories for years. A well-defined scent spoor might never be forgotten by a beast if it had first been sensed under unusual circumstances, and so Tarzan was confident that Numa's nose had already reminded him of all the circumstances of their brief connection.