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94 no inconvenience because of their under­ground quarters.

The domes themselves were well ventilated through the large central air shaft and the numer­ous windows that pierced the outer walls at fre­quent intervals at each level above the ground floor, in which, as previously explained, there are but four openings. The windows, which were six and one-quarter inches wide by eighteen and a half inches high, admitted a certain amount of light as well as air; but the interior of the dome, especially the gloomy chambers mid-way between the windows and the central light and air shaft, was illuminated by immense, slow-burning, smoke­less candles.

Tarzan watched the construction of the new dome with keenest interest, realizing that it was the only opportunity that he ever would have to see the interior of one of these remarkable, human hives, and as he was thus engaged Komodoflorensal and his friends hastened to initiate him into the mysteries of their language; and while he learned the language of his hosts he learned many other things of interest about them. The slaves, he discovered, were either prisoners of war or the descendants of prisoners of war. Some had been in bondage for so many generations that all trace of their origin had become lost and they consid­ered themselves as much citizens of Trohanadalmakus, the city of King Adendrohahkis, as did