The rapidity with which the ice pack moves is something wonderful. Miles upon miles of sea will be free from ice, with the exception of small masses from the floes, and the ship ploughs a steady course to the north. Suddenly the wind changes. Ice swiftly makes its appearance on every quarter, and—with incredible rapidity—the vessel is surrounded. But warning has been given from the “crow’s nest” (the look-out aloft, a barrel at masthead), and the Master works a cautious way through the “leads” in the shifting ice. Should the pack be exceptionally heavy, threatening to pen in the ship completely, measures for her safety are immediately taken. Orders ring out sharply. The crew, with ice saws or blasting powder, quickly make a space in the ice, like a temporary dock, large enough to warp her into, where she can lie snug while the savage floes grind and crash against each other without. Woe to the ship caught between them ere such a refuge can be made! No vessel that ever adventured in the polar seas could stand the awful grip. There would be a rending of the stoutest timbers, groans of a ship in agony, a lift and a quiver, and as the floes swung apart on the black swell below, the brave creature, mangled, rent, and stove in, would plunge to her bitter grave. As for her crew, their only chance would be to lower the boats, and, either marooned on the ice, drift south on the prevailing current until perchance sighted by a ship; or, if afloat, work their perilous way to the Greenland coast, and take refuge at one of the Danish settlements sparsely scattered on its southern extremity. Icebergs—those rightly dreaded wanderers of the northern seas—afford a glorious vision in bright, calm weather, as they wend their majestic course to the south, tinted by the setting sun or by the indescribable loveliness of the northern sunrise. Sometimes a large portion having been melted, breaks from the berg, when the vast mass slowly careens over, plunges with a thunderous crash, and reasserts itself upon a new floating base, peerless and beautiful as ever. The ship is fortunate who finds herself standing well away at such a moment.