I observed as we walked along its edge that the shore of the lake was precipitous in places, again formed a gradually descending beach, and the dead silence of the space about us, in connection with the death-like stillness of that rigid mass of water and its surroundings, became increasingly impressive and awe-inspiring. Never before had I seen such a perfectly quiet glass-like surface. Not a vibration or undulation appeared in any direction. The solidity of steel was exemplified in its steady, apparently inflexible contour, and yet the pure element was so transparent that the bottom of the pool was as clearly defined as the top of the cavern above me. The lights and shades of the familiar lakes of Western New York were wanting here, and it suddenly came to my mind that there were surface reflections, but no shadows, and musing on this extraordinary fact, I stood motionless on a jutting cliff absorbed in meditation, abstractedly gazing down into that transparent depth. Without sun or moon, without apparent source of light, and yet perfectly illuminated, the lofty caverns seemed cut by that aqueous plane into two sections, one above and one below a transparent, rigid surface line. The dividing line, or horizontal plane, appeared as much a surface of air as a surface of water, and the material above that plane seemed no more nor less a gas, or liquid, than that beneath it. If two limpid, transparent liquids, immiscible, but of different gravities, be poured into the same vessel, the line of demarkation will be as a brilliant mirror, such as I now beheld parting and yet uniting the surfaces of air and water.
Lost in contemplation, I unconsciously asked the mental question:
"Where are the shadows?"
My guide replied:
"You have been accustomed to lakes on the surface of the earth; water that is illuminated from above; now you see by a light that is developed from within and below, as well as from above. There is no outside point of illumination, for the light of this cavern, as you know, is neither transmitted through an overlying atmosphere nor radiated from a luminous center. It is an inherent quality, and as objects above us and within the lake are illuminated alike from all sides, there can be no shadows."
Musingly, I said:
"That which has occurred before in this journey to the unknown country of which I have been advised, seemed mysterious; but each succeeding step discovers to me another novelty that is more mysterious, with unlooked-for phenomena that are more obscure."
"This phenomenon is not more of a mystery than is the fact that light radiates from the sun. Man can not explain that, and I shall not now attempt to explain this. Both conditions are attributes of force, but with this distinction—the crude light and heat of the sun, such as men experience on the surface of the earth, is here refined and softened, and the characteristic glare and harshness of the light that is known to those who live on the earth's surface is absent here. The solar ray, after penetrating the earth's crust, is tempered and refined by agencies which man will yet investigate understandingly, but which he can not now comprehend."
