He found that Otie had partly cleared out the rib before that too-willing helper had taken it into his head to knock a hole through the planking. The rib must come away entirely! The tough oak resisted; the chisel slipped; it was maddeningly slow work. But he finished the task at last and began to gouge a channel in the planking close to the other ribs. Torpor was wrapping its tentacles about him. He heard his companions gasping for breath. Then, all at once, he felt a little pat on his shoulder. He knew that tap for what it was, though she did not speak to him; it was the girl's reassuring touch. It comforted him to be told in that manner that she was keeping up her courage in the horrible situation. He beveled the planks as deeply as he dared, and made his cut around three sides of his square. He was forced to stop for a moment and lay prostrate, his face on the lumber.

“Take that saw, one of you, and chunk off a few short lengths of plank,” he whispered, hoarsely. The rasp of the hand-saw informed him that he had been obeyed.

He held his eyes wide open with effort as he lay there in the darkness. Then he struggled up and went at his task once more. Queerly colored flames were shooting before his straining eyes. He toiled in partial delirium, and it seemed to him that he was looking again at the phantasmagoria of the Coston lights on the fog when the yachtsmen were serenading the girl of the Polly. He found himself muttering, keeping time to his chisel-blows:

“Our Polly O,
O'er the sea you go—”

In all the human emotions there is no more maddening and soul-flaying terror than the fear of being shut in, which wise men call claustrophobia. Mayo had been a man of the open—of wide horizons, drinking from the fount of all the air under the heavens. This hideous confinement was demoralizing his reason. He wanted to throw down his hammer and chisel and scream and kick and throw himself up against the penning planks. On the other side was air—the open! There was still one side of the square to do.

Again that comforting little hand touched his shoulder and he was spurred by the thought that the girl was still courageous and had faith in him. He groaned and kept on.

Lapse of time ceased to have significance. Every now and then the hammer slipped and bruised his hand cruelly. But he did not feel the hurt. Both tools wavered in his grasp. He struck a desperate—a despairing blow and the hammer and chisel dropped. He knew that he had finished the fourth side. He fell across Polly Candage's lap and she helped him to his knees.

“I'm done, men,” he gasped. “All together with those joists! Strike together! Right above my head.”

He heard the skipper count one—two—three. He heard the concerted blow. The planks did not give way.

“We don't seem to have no strength left,” explained the mate, in hoarse tones.