“As we advanced further into the recesses of the mountain, the character of the cave changed. The angular crystalline forms which indicated the sudden withdrawal of the molten matter, or the deposit of elements sublimed by intense heat, yielded to smooth and rounded structures, like the worn rocks of the river side, giving the impression that the walls had served as a sluice to fiery torrents pouring from the volcano. A few steps farther showed us the singular curtain-like foldings of a substance resembling lampblack. Absolutely without lustre, and absorbent of every ray of light, it was present, as it were, only to the touch. With certain misgivings under this curtain of gloom, we entered a cavern the form or extent of which could only be known by touch of hands, for no possible brilliancy of light would command an answering reflection from the absorbent surface. Broken as was the surface to the touch, to the eye it was without form. The floor was invisible, and we were guided in our steps by our staves alone. It was like stepping into primal chaos, before light and form had birth. A profound chasm seemed to yawn at our feet; yet the rocky floor rang to the blow of the staff, and with cautious tread we proceeded. The flame of the lamp met no responsive glow; save from the two intruders who stood awe stricken in this strange emptiness; it stood in the still blackness unflickering, like a solid. Feeling the broken walls, the hand was met by an oily softness; the eye was useless, and even the touch now failed to guide us. Solid walls were not to the eye; rocky barriers seemed simply impenetrable darkness to the hand.