Dr. Hayes measured an immense iceberg which had stranded off the little harbor of Tessuissak, to the north of Melville Bay. The square wall which faced toward his base of measurement was 315 feet high, and a fraction over three-quarters of a mile long. Being almost square-sided above the sea, the same shape must have extended beneath it; and since, by measurements made two days before, Hayes had discovered that fresh-water ice floating in salt water has above the surface to below it the proportion of one to seven, this crystallized mountain must have gone aground in a depth of nearly half a mile. A rude estimate of its size, made on the spot, gave in cubical contents about 27,000 millions of feet, and in weight something like 2000 millions of tons! Captain Ross in his first voyage mentions another of these wrecked bergs, which was found to be 4169 yards long, 3689 yards broad, and 51 feet high above the level of the sea. It was aground in 61 fathoms, and its weight was estimated by an officer of the “Alexander” at 1,292,397,673 tons. On ascending the flat top of this iceberg, it was found occupied by a huge white bear, who justly deeming “discretion the best part of valor,” sprang into the sea before he could be fired at. The vast dimensions of the icebergs appear less astonishing when we consider that many of the glaciers or ice-rivers from which they are dislodged are equal in size or volume to the largest streams of continental Europe. Thus one of the eight glaciers existing in the district of Omenak, in Greenland, is no less than an English mile broad, and forms an ice-wall rising 160 feet above the sea. Further to the north, Melville Bay and Whale Sound are the seat of vast ice-rivers. Here Tyndall glacier forms a coast-line of ice over two miles long, almost burying its face in the sea, and carrying the eye along a broad and winding valley, up steps of ice of giant height, until at length the slope loses itself in the unknown ice-desert beyond. But grand above all is the magnificent Humboldt glacier, which, connecting Greenland and Washington Land, forms a solid glassy wall 300 feet above the water-level, with an unknown depth below it, while its curved face extends full sixty miles in length from Cape Agassiz to Cape Forbes. In the temperate zone it would be one of the mightiest rivers of the earth; here, in the frozen solitudes of the North, it slowly drops its vast fragments into the waters, making the solitudes around re-echo with their fall. As the Polar shores of continental America and Siberia are generally flat, and below the snow-line, they are consequently deprived both of glaciers and of the huge floating masses to which these give birth.