Bart was there first, and tapped at the post.

No answer.

He tapped again.

Still there was no answer.

He raised the canvas and looked in. He saw the mossy interior, but perceived that it was empty. All the others looked in. On learning this they turned away puzzled.

"Wal, I thought so," said Captain Corbet. "They jest come an go as the fancy takes 'em. They're off on Cape d'Or to-day, an back here to-morrer."

As he said this he seated himself near the tent, and the boys looked around with sad and sombre faces.

It was now about half past five, and the day had dawned for some time. In the east the fog had lifted, and the sun was shining brightly.

"I told you thar'd be a change, boys," said the captain.

As he spoke there came a long succession of sharp, shrill blasts from the fog horn of the Antelope, which started every one, and made them run to the rising ground to find out the cause.