attitude. There was a long silence, profound and unbroken; then a deep, sullen boom came floating down out of the distance.

“What is it!” exclaimed Joe, under his breath.

“I wonder,” said Tom in a whisper.

“’Tain’t thunder,” said Huckleberry, in an awed tone, “becuz thunder — ”

“Hark!” said Tom. “Listen — don’t talk.”

They waited a time that seemed an age, and then the same muffled boom troubled the solemn hush.

“Let’s go and see.”

They sprang to their feet and hurried to the shore toward the town.