"Peters described a strange natural phenomenon that exists on an island not more than half a mile in length, which the party visited after leaving Lilama's island. Near the centre of this last-mentioned island, says Peters, is a volcanic mountain about four thousand feet in height, with an extinct crater reaching down through the centre of the mountain to within a hundred feet of the sea-level, and, at its lower part, communicating with the outer surface by a tunnel some ten feet in diameter. Upon entering, by means of the tunnel, this sunken crater, a gallery was found, ascending spirally by at least twenty turns to the extreme peak of the mountain. The diameter of the crater was about one hundred feet at the bottom, about two hundred feet at the top--the diameter widening at each complete circuit of the gallery by from eight to twelve feet, the breadth of the gallery varying from four feet to six. Looking from below at the opening above, the spot of sky, says Peters, looked like the full moon. The length of the gallery, as its gradient is about forty-five degrees, must be about a mile and a half. Out of the gallery, at several points in the ascent, passes a small side-tunnel, communicating with the exterior. "On still another island, about a hundred miles from Hili-li, but on about the same meridian--that is to say, in the same warm air-current, though the heat of the current was there much diminished by dilution--the party visited certain ruins which had always greatly puzzled the Hili-lites. The island was quite large, and was covered with agricultural farms, from which a single crop was taken each year. The ruins were quite uninjured by time; and one small stone structure was so complete as to be scarcely more dilapidated in appearance than would be any other old and neglected stone building in Hili-li. The stone of which the various structures were composed had never in all the centuries of their residence there been found by the Hili-lites elsewhere than in these buildings; the supposition being that it came from the great surrounding continent. But, after all, the real peculiarity of these buildings was in their architecture. The difficulty of obtaining from Peters any architectural facts, you will never appreciate unless you attempt, as I have done, to procure such information. He declares that in these buildings were neither columns nor arches; and he also declares that the absence of arches and columns he knows, not only from his own observation, but because that fact was alluded to in his presence by the Hili-lite members of the party; yet he is equally certain that in one of the larger of the ruins the roof was intact. How a roof could be supported without reasonable vertical resistance, and without arch resistance, I am unable to say; and it is wholly improbable that the walls in a building of its dimensions could, without an arch, support a roof. The Hellenes, you recall, were very