The ice upon which they had been voyaging is a part of a great ocean of ice covering the central line of Greenland from Cape Farewell on the south to the farthest known northern boundary, a distance of at least twelve hundred miles. Instead of being formed of drops of water like more southern oceans, it is made up of crystallized dew-drops and snow-flakes, which have been falling for ages, and which in these cold regions have no summer long enough, nor of sufficient heat, to convert them into water again.
But if the crystal dews and snows continue to fall for ages, and never melt, what prevents them from piling up to the sky, and sinking the very continent? The all-wise Director of the universe has made a very curious arrangement to prevent such a result. This ice-ocean runs off into the sea in great ice-rivers which find their way to the shore on both sides of the continent, just as the water does which falls from the clouds on the top of the Andes of South America. There we see the mighty Amazon, one of its rivers, almost an ocean of itself, as it sweeps along its banks between mountains, and through immense forests. Greenland has its Amazons in vastness and grandeur, as well as its smaller rivers and little streams. It has also its lakes and sublime Niagaras, its falls and cascades. But they are ice instead of water; that is all the difference between this Arctic circulation and that of warmer regions.
But of course this ice is not like that which many of the readers see every winter. It is a half-solid, pasty kind of substance. It holds together, yet slides along from the higher land where it accumulates, filling up the valleys, breaking through the openings in the mountain and hilly ridges, and pouring over the precipices; slowly, silently, but with mighty force, ever pressing onward until it reaches the sea.
These ice rivers move very slowly. It will be remembered that Dr. Hayes drove some stakes down in the one he visited in October. In the following July he visited the glacier again, and compared the relation of these to the landmarks he had noted. He thus found that this ice-river moved over one hundred feet a year. It had come down the valley ten miles. Two more miles would bring it to the sea. Some glacier streams which they visited were yet many miles from the shore, one as far away as sixty miles. The Great Glacier of Humboldt, farther north, was several times visited by Dr. Kane and parties of his explorers. Its face is a solid, glassy wall three hundred feet above the water-level, and in extending from Cape Agassiz, a measured distance north, of sixty miles, and then disappearing in the unknown polar regions. Surely this must be the mouth of the Amazon of glacier rivers.
But the history of these rivers does not end when they reach the sea. When their broad and high glassy front touches the water it does not melt away nor fall to pieces, but goes down to the bottom, and if it be a shallow bay or arm of the sea, pushes the water back and fills up the whole space, it may be for many miles. When it reaches water so deep that more than seven eighths of its front is below the surface, it begins to feel an upward pressure, just as a piece of wood when forced below its natural water-line will spring back. So after a while this upward pressure breaks off the massive front, perhaps miles in extent, and many hundred feet in height. As this is launched into the sea its thunder crash is heard for miles, and the water boils like a caldron, while the disengaged mass rolls and plunges until, finding its equilibrium, it sails away a majestic ICEBERG. Hereafter the snow will at times cover it with a mantle of pure whiteness; the fierce storms will beat upon its defiant brow; the beams of the rising and setting sun will display their sparkling glories on its craggy top, or, falling upon the misty cloud which envelopes it, will encircle it with all the varying hues of the rainbow. As it voyages in stately dignity southward, anchored, it may be, at times for months, it will pass in sullen silence the drear, long, dark Arctic night, and emerge into the brief summer to be enlivened as the home of innumerable sea-fowl, who will rear their young upon its cold breast. Ultimately it will go back to the drops of water from which it came, to make a part of the great ocean, and possibly to sail away in clouds over the frozen regions, and to drop again upon its glassy plain in sparkling crystals.
CHAPTER XXXI.
A STRANGE DREAM AND ITS FULFILLMENT.
THE winter was fully settled down upon Port Foulke, but the dwellers in the schooner "United States" knew nothing of the anxieties and suffering from cold and hunger which most of the arctic voyagers have known. There was one foe, however, which they, in common with all who had gone before them, had to fight; namely, depression of mind produced by the weeks of inactivity and darkness. We have seen how many means were used by earlier as well as later explorers to meet and vanquish this foe. Dr. Hayes availed himself of the hints given by his predecessors, and had some devices peculiarly his own. To the "school of navigation," dramatic performances, and the publishing of a weekly "newspaper," was added the pleasant stimulus of a celebration of the birthday of every man on board. Such occasions were attended by special dinners, the passing of complimentary notes of invitations to the intended guests, which included all, and by fun-making, at which all laughed as a matter of course.