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.