ADVENTURES OF CAPTAIN HORN
judged that the cave was very much wider here, and he also thought that the roof was higher. But he did not pay much attention to the dimensions of the cavern, for he began to discern, at first dimly and then quite plainly, a large object which rose from the bottom of the basin. He advanced eagerly, peering at what seemed to be a sort of dome-like formation of a lighter color than the rocks about him, and apparently about ten feet high.
Carefully feeling his way for fear of pitfalls, the captain drew close to the object, and placed his hand upon it. He believed it to be of stone, and moving his hand over it, he thought he could feel joints of masonry. It was clearly a structure built by men. Captain Horn searched his pockets for a match, but found none, and he hastened back to the cave to get the lantern, passing, without noticing it, the pail which he had filled with water. He would have brought the lantern with him when he first came, but they had no oil except what it contained, and this they had husbanded for emergencies. But now the captain wanted light—he cared not what might happen afterwards. In a very short time, with the lantern in his hand, which lighted up the cave for a considerable distance about him, the captain again stood at the foot of the subterranean dome.
He walked around it. He raised and lowered his lantern, and examined it from top to bottom. It was one half a sphere of masonry, built in a most careful manner, and, to all appearances, as solid as a great stone ball, half sunken in the ground. Its surface was smooth, excepting for two lines of protuberances, each a few inches in height, and about a foot from
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