"Holy poker, but dat near shave, I guess! Massa Jim, what yo doin' dat for? Yo's mad! Yo's goin' to drown yo'self!" shouted Tom, rising to his feet so rapidly that his huge bulk set the ship's boat rocking dangerously. "Drown himself! He's jest committing suicide! I tell you, he's bound to go under," growled the captain, who, if the truth had only been known, felt himself so strongly impelled to leap into the sea and help in this foolhardy but gallant effort at rescue that it was only by exercising the greatest self-control that he was able to hold himself in check. "If I wasn't skipper I'd do it," he cried. "But it would be a fool's game. Besides, I've got to remember that I'm in charge of this expedition." Meanwhile Jim's head had burst from the surface of the water, and the plucky lad was forcing his way towards the sinking vessel with powerful strokes. He gave no heed to the shouts and calls of those behind him, not even when Sadie, beside herself with anxiety, rose from her seat in the stern of the boat and shrieked to him to return instantly. "I'll do it, or go under," he told himself grimly. "A sinking ship ain't going to frighten me. Guess a chap couldn't float out there in safety and see a man drowned before his eyes, especially a man that's unable to fend for himself." Though the water dripped into his eyes from his hair, and made seeing difficult, he, too, had observed the terrific lurch which the foundering vessel had just given; and if he had had any doubts as to her true condition they were instantly set aside by the mass of her stern elevated in such an ungainly manner into the air. "Aboard there!" he shouted; "jump over into the water. She is going down." Thanks to an oil lantern which still hung amidships, below the bridge, he could see the man for whose rescue he was striving, and as he thrust his way strenuously through the water he watched the injured passenger pick himself up on hand and knees and struggle towards the rail. He wedged his feet against a stanchion supporting the latter, and as Jim arrived within a few yards of the vessel, the man was again endeavouring to clamber over the rail. Then there came, of a sudden, another sluggish lurch. The ship appeared to shiver throughout her framework, and rolled heavily from side to side. A moment later her bows rose rapidly from the ocean in which they had been submerged, while the stern regained almost its normal position. It looked, in fact, as if she were making one last gallant effort to float upon the surface. But again she rolled heavily from side to side, till her decks were slanting at a sickening angle, greater indeed than that to which Jim and his mates had become accustomed when cruising to the south along the Caribbean coast.