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He broke off to gaze with dropped jaw at a spiral of smoke that coiled and twisted in the lee of the mizzenmast twenty feet above the deck.

"Now, how did that get there?" he demanded indignantly.

Beneath it there was no smoke. Crawling up from the deck, sheltered from the wind by the mast, by some freak it took form and visibility at that height. It writhed away from the mast, and for a moment overhung the captain like some threatening portent. The next moment the wind whisked it away, and the captain's jaw returned to place.

"As I was saying, when we first battened down, I was surprised. It was a tight deck, yet it leaked smoke like a sieve. And we've calked and calked ever since. There must be tremendous pressure underneath to drive so much smoke through."

That afternoon the sky became overcast again, and squally, drizzly weather set in.