As I viewed the pageant of mural history I had approached very closely the. end of the low-ceiled hall, and was aware of a gate through which cams all of the illuminating phosphorescence. Creeping up to it, I cried aloud in transcendent amazement at what lay beyond; for instead of other and brighter chambers there was only an illimitable void of uniform radiance, such as one might fancy when gazing down from the peak of Mount Everest upon a sea of sunlit mist. Behind me was a passage so cramped that I could not stand upright in it; before me was an infinity of subterranean effulgence.