A thick mist had arisen, and though the captain was on the bridge his form could not be distinguished.

The phosphorescent pathway in the wake of the big ship gleamed and scintillated.

"How beautiful," remarked Jack.

"Yes," replied Bambino. "It looks like a sea of fire. One might walk on it."

"I should not like to try," Jack said, laughing.

"Suppose you do make the effort."

At these words of Bambino, Jack turned half round sharply, and faced him squarely.

"What do you mean?" he demanded.

"Precisely what I say," rejoined Bambino.

They were standing at the stern of the ship, right behind the wheel-house.