CHAPTER XI

A MYSTERY

With an odd sensation tingling in his veins, Grenville examined his find.

It was merely a cylinder, made of brass, fully three inches in diameter, and, perhaps, eight inches long. Its cap was rusted so firmly in place that he could not possibly remove it. He gave the tube a shake. There was something inside, but its weight was exceedingly light.

Once more he knelt before the secret locker to examine all its walls. But although his fingers finally played upon every square inch of the sides and ceiling, there was nothing further to be found. Apparently the only "treasure" the place had concealed was contained within the tube.

He thought of a score of documents the one-time captain of the barque might have thus desired to preserve, but the sun was rapidly nearing its purple horizon, and the old ship's hold was growing dark. Grenville gathered the last of the metal spoils he had found in an empty box, half rotted, on the floor. The tube he thrust firmly in his pocket.

What with the cannon balanced on his shoulder, his box of rusted metal hugged beneath his arm, and his bow, club, and arrows clutched tightly in his hand, he presented a singular figure as he finally made his way along the darkening trail, and came at length to the clearing, to be hailed from the heights by Elaine.

"Just for the sake of variety," he said, when he came to the terrace with his burdens, "we'll eat one more dinner of fruit."

"I couldn't think what you had killed," said Elaine, "when I saw you coming with this," and she placed her foot on the cannon he had gladly dropped to the ground. "What is it, anyway?"

"A pop-gun," he said, "to tickle my friend the tiger."