"Hi! look out!" cried Dave. "If we got one of those on our heads——"
His voice echoed loudly throughout the cave, and then down came two more icicles, one hitting his shoulder. He was thoroughly alarmed and leaped to a spot beyond, literally dragging Roger with him.
"That was a close shave!" murmured the senator's son. "Dave, this spot is full of perils!"
On they went once more, until Dave was almost certain he saw some sort of an opening ahead of them. He pointed it out; and just then the tiny light of the pocket lantern began to flicker.
"Dave, the light is going out!"
"I know it."
"Can't you turn it up a bit?"
"No; the oil is gone," was the answer, after Dave had shaken the lantern to make certain of that fact.
"What will we do if we are left in the dark?"
"Hurry; I think we can reach that opening—if it is an opening."