The mass thus disengaged at first disappeared wholly under water, and nothing could be seen but a violent seething of the sea, and the ascent of clouds of glittering spray, such as that which occurs at the foot of a great waterfall. But after a short time it reappeared, raising its head fully a hundred feet above the surface, with water streaming down on every side; and then labouring, as if doubtful which way it should fall, it rolled over, rocked to and fro for a few minutes, and finally became settled. On approaching and measuring it, Beechey found it to be nearly a quarter of a mile in circumference, and sixty feet out of the water. Knowing its specific gravity, and making a fair allowance for its inequalities, he computed its weight at 421,660 tons. In Parry’s first voyage he passed in one day fifty icebergs of large dimensions, just after crossing the Arctic Circle; and on the following day a still more extended chain of ice-peaks of still larger size, against which a heavy southerly swell was violently driven, dashing the loose ice with tremendous force, sometimes flinging a white spray over them to the height of more than one hundred feet, and accompanied by a loud noise “exactly resembling the roar of distant thunder.” Between one of these bergs and a detached floe the _Hecla_, Parry’s ship, had nearly, as the whalers say, been “nipped,” or crushed. The berg was about one hundred and forty feet high, and aground in one hundred and twenty fathoms, so that its whole height must have exceeded eight hundred feet; that is, it was of a bulk equal to St. Catherine’s Down in the Isle of Wight. In his second voyage Parry speaks of fifty-four icebergs visible at one time, some of which were not less than two hundred feet above the sea; and again of thirty of these huge masses, many of them whirled about by the tides like straws on a mill-stream. Icebergs can originate only in regions where glaciers abound: the former are the offspring of the latter, and where land unsuitable to the production of the latter does not exist, the former are never found. Hence, in Baffin Bay, where steep cliffs of cold granite frown over almost fathomless waters, the “monarch of glacial formations” floats slowly from the ravine which has been its birthplace, until fairly launched into the depths of ocean, and, “after long years,” drifts into the warmer regions of the Atlantic to assist in the preservation of Nature’s laws of equilibrium of temperature of the air and water.