higher elevations and dropping again to its lower levels as he covered a considerable distance between the east tower and that flat-topped structure of peculiar design in which La was supposed to be incarcerated. His progress was slow, for he moved with the caution of a beast of prey, stopping often in dense shadows to listen.
When at last he reached the tower, he found that it had many openings letting upon the roof—openings which were closed only with hangings of the heavy tapestried stuff which he had seen in the tower. Drawing one of these slightly aside he looked within upon a large chamber, bare of furnishings, from the center of which there protruded through a circular aperture the top of a stairway similar to that he had ascended in the east tower. There was no one in sight within the chamber, and Tarzan crossed immediately to the stairway. Peering cautiously into the opening Tarzan saw that the stairway descended for a great distance, passing many floors. How far it went he could not judge, except it seemed likely that it pierced subterranean chambers beneath the palace. Sounds of life came up to him through the shaft, and odors, too, but the latter largely nullified, in so far as the scent impressions which they offered Tarzan were concerned, by the heavy incense which pervaded the entire palace.
It was this perfume that was to prove the ape-man's undoing, for otherwise his keen nostrils would have detected the scent of a near-by Goman-
