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 his naked feet felt a sudden change in the substance they were treading. The steps of concrete had given place to steps of granite. Feeling with his hands, the ape-man discovered that these latter were evidently hewed from rock, for there was no crack to indicate a joint.

For a hundred feet the steps wound spirally up, until at a sudden turning Tarzan came into a narrow cleft between two rocky walls. Above him shone the starry sky, and before him a steep incline replaced the steps that had terminated at its foot. Up this pathway Tarzan hastened, and at its upper end came out upon the rough top of a huge granite bowlder.

A mile away lay the ruined city of Opar, its domes and turrets bathed in the soft light of the equatorial moon. Tarzan dropped his eyes to the ingot he had brought away with him. For a moment he examined it by the moon's bright rays, then he raised his head to look out upon the ancient piles of crumbling grandeur in the distance.

"Opar," he mused, "Opar, the enchanted city of a dead and forgotten past. The city of the beauties and the beasts. City of horrors and death; but—city of fabulous riches." The ingot was of virgin gold.

The bowlder on which Tarzan found himself lay well out in the plain between the city and the distant cliffs he and his black warriors had scaled the morning previous. To descend its rough and precipitous face was a task of infinite labor and considerable peril even