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 to such architectural forms as appealed to the eyes of the builders while at the same time following roughly the original outlines of the hills in an evident desire to economize both labor and space. The excavation of the apartments within had been similarly governed by necessity.

As he came nearer Tarzan saw that the waste material from these building operations had been utilized in the construction of outer walls about each building or group of buildings resulting from a single hillock, and later he was to learn that it had also been used for the filling of inequalities between the hills and the forming of paved streets throughout the city, the result, possibly, more of the adoption of an easy method of disposing of the quantities of broken limestone than by any real necessity for pavements.

There were people moving about within the city and upon the narrow ledges and terraces that broke the lines of the buildings and which seemed to be a peculiarity of Ho-don architecture, a concession, no doubt, to some inherent instinct that might be traced back to their early cliff-dwelling progenitors.

Tarzan was not surprised that at a short distance he aroused no suspicion or curiosity in the minds of those who saw him, since, until closer scrutiny was possible, there was little to distinguish him from a native either in his general conformation or his color. He had, of course,