CHAPTER III.
SAM'S ADVENTURE AT HUMPBACK FALLS.
For several minutes after Dick leaped overboard to Tom's assistance, Sam's one thought was of his two brothers. Would they reach the tree or the shore in safety? Fervently he prayed they would.
The tree went around and around, as a side current caught it, and presently the whirlings became so rapid that Sam grew dizzy and had to hold tight to keep from falling off.
He saw Dick catch Tom from the back and start for shore, and then like a flash the realization of his own situation dawned upon him. He was on the tree with no means of guiding his improvised craft, and sweeping nearer and nearer to the rapids of which he had heard so much but really knew so little.
"I must get this tree to the river bank," he said to himself, and looked around for some limb which might be cut off and used for a pole.
But no such limb was handy, and even had there been there would have been no time in
