At last the anchor was up, the sails were set, and off we glided. It was a short, cold Christmas; and as the short northern day merged into night, we found ourselves almost broad upon the wintry ocean, whose freezing spray cased us in ice, as in polished armor. The long rows of teeth on the bulwarks glistened in the moonlight; and like the white ivory tusks of some huge elephant, vast curving icicles depended from the bows.