"Aye, aye, sir. Macdougal, get to at it!" growled the mate, scowling at the sailor, and clenching a pair of brawny fists. Not that this officer was really angry with Macdougal. In his heart of hearts he rather admired the man; but discipline was discipline, and the skipper had many a time proved his own courage and discretion. Still, even his persuasion did not make of the sailor a willing man; for the moment Macdougal was obedient, though mutiny and smouldering anger flashed from his eyes. Meanwhile the sinking vessel had displayed another series of erratic movements. That sickening roll from side to side had been replaced by a gentle pitching fore and aft, and as the seconds fled swiftly by, the pitching had become slowly and almost imperceptibly greater. Then, suddenly, the vessel tossed her bows into the air till her watermarks were visible to those swimming in the ocean. But it was only for a little while. The bows came down again with a heave, which sent her forecastle beneath the surface, till she looked as though she were in the act of plunging to the bottom. Up she came again, displacing a huge mass of water, and raising a wave which spread quickly across the sea till it reached the boat hovering at a distance and rocked it. She canted heavily to port, showing the whole of her length of deck, and with such a violent movement that the passenger aboard was flung clear of the rail right out into the water. Then souse went her bows once more, raising the stern like a pinnacle into the gloom which surrounded everything. "Yo grip him and get away back, quick as yo can," bellowed Tom, his mouth almost submerged, his powerful arms bearing him swiftly to help in the rescue. "I's close behind yo, Massa Jim." But he might have shouted to a log of wood for all the use his words were. Jim heard not a syllable of his warning, for his eyes and all his attention were fixed upon the injured man who had been thrown from the vessel. He reached him in the course of a few seconds, and turning him upon his back supported his head. "I'm fine," he heard the man say faintly. "This arm of mine don't give me no more than a dog's chance of swimming. You clear off, young chap. You've the right stuff in you, there ain't a doubt; but I'm fine. Don't you get worrying."