The Fur Country by Jules Verne — Read

Hobson's first care on his return to the fort, was to make inquiries of Thomas Black as to the situation of the little colony. No change had taken place for the last twenty-four hours, but, as subsequently appeared, the island had floated one degree of latitude further south, whilst still retaining its motion towards the west. It was now at the same distance from the equator as Icy Cape, a little promontory of western Alaska, and two hundred miles from the American coast. The speed of the current seemed to be less here than in the eastern part of the Arctic Ocean, but the island continued to advance, and, much to Hobson's annoyance, towards the dreaded Bering Strait. It was now only the 24th July, and a current of average speed would carry it in another month through the strait and into the heated waves of the Pacific, where it would melt "like a lump of sugar in a glass of water."

Mrs. Barnett acquainted Madge with the result of the exploration of the island. She explained to her the arrangement of the layers of earth and ice at the part where the isthmus had been broken off; told her that the thickness of the ice below the sea level was estimated at five feet; related the accident to Sergeant Long -- in short, she made her fully understand the reasons there were to fear the breaking up or sinking of the ice field.