Once or twice they heard terrific crashes, as portions of the wall fell.

They would long since have been roasted, were it not for the cool air which flowed in through the long loophole, and keeping up a circulation in the chamber, lowered the temperature of the air within it.

At the end of the two hours Harry gave a shout.
"They are coming back." The light had now sunk to a quiet red glow, so that beyond the fact that a party was approaching, nothing could be seen.

They rode, however, directly toward the turret, and then, when they halted, Harry saw the figures of two ladies who were pointing toward the loophole.

Harry now stepped from the ladder on to the door and shouted at the top of his voice through the loophole.