The ape-man stood gazing down into the wooded basin below them, his mind occupied with the problems of the moment. Had he been alone he would not have come this way, for he was sufficiently confident of his own prowess to believe that he might easily have crossed the valley of Opar in comparative safety, regardless of Cadj’s plans to the contrary. But he was not alone. He had now to think of La, and he realized that in her efforts to save him she had placed him under a moral obligation which he might not disregard. To skirt the basin, keeping as far as possible from the building, which he could see in the distance, seemed the wisest course to pursue, since, of course, his sole purpose was to find a way across the mountain and out of this inhospitable country. But the glimpses he caught of the edifice, half concealed as it was amid the foliage of great trees, piqued his curiosity to such an extent that he felt an almost irresistible urge to investigate. He did not believe that the basin was inhabited by other than wild beasts, and he attributed the building which he saw to the handiwork of an extinct or departed people, either contemporaneous with the ancient Atlantians who had built Opar or, perhaps, built by the original Oparians themselves, but now forgotten by their descendants. The glimpses which he caught of the building suggested such size and magnificence as might belong to a palace. The ape-man knew no fear, though he possessed to a reasonable extent that caution which is inherent in all wild beasts. He would not have hesitated to pit his cunning and his prowess against the lower orders, however ferocious they might be, for, unlike man, they could not band together to his undoing. But should men elect to hunt him in numbers he knew that a real danger would confront him, and that, in the face of their combined strength and intelligence, his own might not avail him. There was little likelihood, however, he reasoned, that the basin was inhabited by human beings. Doubtless closer investigation of the building he saw would reveal that it was but a deserted ruin, and that the most formidable foes he would encounter would be the great apes and the lions. Of neither of these had he any fear; with the former it was even reasonable to imagine that he might establish amicable relations. Believing as he did that he must look for egress from the basin upon its opposite side, it was only natural that he should wish to choose the most direct route across the basin. Therefore his inclinations to explore the valley were seconded by considerations of speed and expediency. “Come,” he said to La, and started down the declivity which led into the basin in the direction of the building ahead of them. “You are not going that way?” she cried in astonishment. “Why not?” he said. “It is the shortest way across the valley, and in so far as I can judge our trail over the mountains is more likely to lie in that direction than elsewhere.”