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 the city had been built, and here, in the fast-waning light, Tarzan thought that between two buildings he caught the glint of water, but of that he was not sure. His experience of the centers of civilization naturally inclined him to believe that this central area was a plaza about which the larger buildings were grouped and that there would be the most logical place to search first for Bertha Kircher and her companion.

And then the sun went down and darkness quickly enveloped the city—a darkness that was accentuated for the ape-man rather than relieved by the artificial lights which immediately appeared in many of the windows visible to him.

Tarzan had noticed that the roofs of most of the buildings were flat, the few exceptions being those of what he imagined to be the more pretentious public structures. How this city had come to exist in this forgotten part of unexplored Africa the ape-man could not conceive. Better than another he realized something of the unsolved secrets of the Great Dark Continent, enormous areas of which have as yet been untouched by the foot of civilized man. Yet he could scarce believe that a city of this size and apparently thus well constructed could have existed for the generations that it must have been there, without intercourse with the outer world. Even though it was surrounded by a trackless desert waste, as he knew it to be, he could not conceive that generation after generation of men could be born and die there without attempting to solve the mysteries