which to prepare it for use, for the rapids were now in plain sight, the water boiling and foaming as it darted over one rock and another, in a descent of thirty feet in forty yards.
"This won't do!" muttered the boy, and wondered if it would not be best to leap overboard and try to swim to safety. But one look at that swirling current made him draw back.
"I reckon I had best stick to the tree and trust to luck to pass the rocks in safety," he muttered, and clutched the tree with a firmer hold than ever.
The strange craft had now stopped circling, and was shooting straight ahead for a rock that stood several feet above water. On it went, and Sam closed his eyes in expectancy of an awful shock which would pitch him headlong, he knew not to where.
But then came a swerve to the left, and the tree grated along the edge of the rock. Before Sam could recover his breath, down it went over the first line of rapids. Here it stuck fast for a moment, then turned over and went on, throwing Sam on the under side.
The boy's feet struck bottom, and he bobbed up like a cork. Again he clutched the tree, and on the two went a distance of ten feet further. But now the tree became jammed between two other rocks, and here it stuck, with Sam clutch-
