In a moment the young inventor was on the spot and closely examining the marks. He was at once satisfied that the trail was found.
CHAPTER VIII.
A GEOLOGICAL PHENOMENON.
There were the footprints of two men just as they descended the stairs. But there were no return marks.
“They’re down there yet,” declared Frank, positively.
Randall looked at him keenly.
“Is this another entrance to the volcano?” he asked.
The young inventor shook his head.
“I think not,” he said, “though what should detain them down there I do not understand.”
“Well, suppose we go down?”
“Certainly.”