For some time, now, the boys had been dully conscious of a peculiar sound in the distance, just as one sometimes is of the ticking of a clock which he takes no distinct note of. But now this mysterious sound became more pronounced, and forced a recognition. The boys started, glanced at each other, and then each assumed a listening 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. They parted the bushes on the bank and peered out over the water. The little steam ferry-boat was about a mile below the village, drifting with the current. Her broad deck seemed crowded with people. There were a great many skiffs rowing about or floating with the stream in the neighborhood of the ferryboat, but the boys could not determine what the men in them were doing. Presently a great jet of white smoke burst from the ferryboat's side, and as it expanded and rose in a lazy cloud, that same dull throb of sound was borne to the listeners again.
"I know now!" exclaimed Tom; "somebody's drownded!"
"That's it!" said Huck; "they done that last summer, when Bill Turner got drownded; they shoot a cannon over the water, and that makes him come up to the top. Yes, and they take loaves of bread and put quicksilver in 'em and set 'em afloat, and wherever there's anybody that's drownded, they'll float right there and stop."