“Gee! I wouldn’t much care to be trapped in here,” said Tubby, as they pressed on.

All at once the path they had been following took a sudden dip. Right under their feet was a narrow chasm. If they had not had lights they might have been precipitated into it, but luckily their lanterns showed them the peril just in time.

For a short time it looked as if the treasure hunt would have to end right there. There seemed to be no means of crossing the chasm, and they had brought none with them.

“So near and yet so far,” breathed Merritt.

But presently the major discovered a stout plank resting against the wall of the passage. It was worm-eaten and old, but a test showed it would support them. It had evidently been left there by the old buccaneer. It caused an odd thrill to shoot through Rob, as he stepped upon it, to reflect that the last foot to press it had been in the tomb for many scores of years.

On the other side of the chasm the cave widened out. In fact, it developed into quite a spacious chamber. The rock walls, imbedded with mica, glistened brightly in the yellow glow of the lanterns.

“We look like a convention of lightning bugs,” commented Tubby, gazing about him at the unusual scene. The professor drew out a paper. He and the major bent over it, while the others listened breathlessly to ascertain the outcome of this inspection of the plan of the long lost treasure trove.

“According to the plan the treasure is located in this chamber,” said the major at length.

“At any rate,” added the professor, “the plan does not give any further details of the cave.”

“Do you think it extends further?” inquired Merritt.