But this soon subsided, and they stepped inside again, to find that a portion of the heap of remains had glided through an opening at the back, evidently the way into another cell—one that was dimly lighted from somewhere above, and which proved as soon as it was examined to be the way they sought, and not merely a narrow shaft, but a wide opening going upward and downward, the steps being in the wall which formed the division between the two chambers.

There was only a narrow landing at the foot of the steps, and below this the opening seemed to go right down like a square well, into whose depths the remains that disappeared had glided and lay far below.

“A huge cistern,” said Wilton eagerly.

“No,” said the doctor; “the old people could not have stored their water just below the way up to the next range of dwellings. More likely a great corn-store or granary.”

“Yes,” said Bourne, “that seems likely;” but Griggs grunted and said nothing.

“What do you think, then?” said the doctor.

“I don’t fancy those old folks would do much farming and corn-growing, sir,” replied Griggs. “You see, it’s a rocky sort of place all about here, with very little soil except in patches, and a short supply of water. Flocks and herds must have been more in their way.”

“Then what would have been the use of a place like this?”

Griggs was silent for a few moments, and then he laconically uttered the word—

“Trap!”