Dick Travers' slumber was not refreshing. Occasionally, he half opened his eyes. The interior of the cave, in the dim light, looked very strange. Deep black shadows stretched up to the jagged roof, and, in places, some mineral sparkled brightly.
But it was something else that finally caught his attention, and caused him to sit bolt upright. A strange sound seemed to come from the roof of the log house.
Dick slowly rose to his feet, and listened intently. He hesitated to awaken his soundly sleeping companions.
As the boy was about to steal forward, a sharp crash echoed throughout the cave with startling clearness. Then followed a series of sounds which fairly made his hair stand on end.
[CHAPTER VIII]
THE INTRUDER
The sleepers awoke on the instant, and scrambled to their feet.
"Great Scott! What was that?" cried Bob Somers.
"Jiminy crickets!" exclaimed Dave.