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 the Wisp? A Jack o' Lantern, some phosphoric phenomenon rising in the exhalations of rotting seaweed?

Ten minutes before, his excited imagination would have conjured up hydras and dragons; now he scrutinized the mysterious illumination unexcitedly. It winked out occasionally, then presently reappeared. But it did not move in an aimless fashion, after the manner of gaseous or electrical phenomena. It pursued a straight line toward the Vulcan. That was why Madden had not observed its movement sooner.

Although it had crept only a little way down from the horizon, the wondering boy could discern its progress plainly among the dark masses of seaweed that blotched the graying water. The light was moving toward the Vulcan and at a high rate of speed.

As he watched it, the enigmatical light suddenly disappeared. The youth blinked his eyes, looked again. It was gone. Then he became a little uncertain whether or not he had ever observed any such phenomenon. He glanced down on the dark deck and could faintly discern the form of the cook.