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148 can see is that through one of its sloping sides there streams a mighty torrent of sunlight, which pours its splendor with unstinting hand upon the wide highways, the broad terraces, the sheer parapets, and the sloping banks which diversify this ice world. Can it be that one side of this mighty mountain which nature has here hollowed out and set like a peaked roof over this vast subterranean region, is a gigantic window of ice itself through which the sunlight of the outer world streams in this grand way like a silent cataract of light, like a deluge of sunshine? No, this could not be; for now upon a second look I saw that this flood of light thus streaming through the side of the mountain came through it like a mighty pencil of rays, and striking the opposite walls with its brilliancy a hundred-fold increased, rebounded in a thousand directions, flooding the whole region with its effulgence and dying away in faint and pearl-like glimmer in the vast approach where I had first noted it.

And therefore I understood that nature must have set a gigantic lens, twice a thousand feet or more in diameter, in the sloping side of this hollow mountain—a perfect lens of purest rock crystal, which, gathering in its mysterious bosom the sunlight of the outer world, threw it—intensely radiant and dazzling white—into the gloomy depths of this World within a World, so that when the sun went up out there, it went up in here as well, but became cold as it was beautiful, bringing no warmth, no other cheer save light, to this subterranean region which for thousands of centuries had lain locked in the crystal embrace of frozen lakes and brooks and rivers and torrents and waterfalls, once bubbling and flowing and rushing headlong through fair lands of the upper world, but suddenly checked in their course by some bursting forth of mighty pent-up forces, and turned downward into these icy depths condemned to everlasting rest and silence, their crystals locked in a sleep that never would know an awaking, mocked in their dreams by this mysterious sunlight that came with the smile and the fair, winsome look of