Trying to pierce the gloom ahead, Dave swung his torch behind him. Was he mistaken, or was that a glimmer of daylight in the distance? He stumbled forward, over some loose stones, and presently came to a split in the narrow passageway.
From overhead came a faint ray of daylight! He almost felt like giving a shout of joy, so welcome was the sight. But then his heart sank once more as he realized that the thin shaft of light came from a split in some rocks which were fifty or sixty feet above his head. The walls were so steep and slippery that to scale them was utterly out of the question.
In front of Dave was now a solid wall of rock, so the youth knew that he could not get out in that direction. With a heavy heart he retraced his steps, trying to locate the opening by which he had entered the cave. But the landslide, or earthquake, had changed the surroundings to such an extent that he hardly knew how to turn to make the next move.
A youth less stout of heart than Dave might have sat down and given up the case as hopeless. But our hero was not made of such stuff. He moved on slowly, in one direction and then another, trying out what looked as if they might be passages to the outer air.
And then came another distant rumble, show-
