with a start, to discover that he could not possibly keep awake another moment.
The boys slept on. The moon came out and shone in at the open tent-flap, and the tide rose to high-water mark, but not quite high enough to reach the tent. By-and-by the wheezing of a tow-boat broke the stillness, and occasionally a hoarse steam-whistle echoed among the hills; but the boys slept so soundly that they would not have heard a locomotive had it whistled its worst within a rod of the tent.
The river had been like a mill-pond since the thunder-storm, but about midnight a heavy swell rolled in toward the shore. It came on, growing larger and larger, and, rushing up the little beach with a fierce roar, dashed into the tent and overwhelmed the sleeping boys without the slightest warning.
