Great walls of white basalt, veined with broad bands of glistening emerald, towered on either side, reaching up to a crystalline roof that spread forth, far as eye could reach, at an altitude scorning the limitations of human architecture. The irregularities of the outer cave, with its rough bowlders and piles of fallen débris, its dark masses of shapeless sandstone, was exchanged here for forms of marvelous symmetry, fashioned, one could but imagine, for the enjoyment of a race of beings to whom the majesty of beauty must be an ever-living reality. Seen by the explorers, in the wavering half light that filled the cave, the bold outlines of cliff and battlement were softened and blended in a vague witchery of design suggesting meanings and distances varying with the fancy of the beholder. It was a vale of enchantments, an Aladdin's cave, from which anything might be expected with the mere rubbing of a ring--or a lamp. As the path broadened the walls became less precipitous; on their sides objects could be distinguished that, anywhere else, would have been taken for man's handiwork. Tiny dwellings appeared to be carved out of solid rock that jutted forth from dizzying heights, while feathery forms of dwarf trees and plants, whose leaves were of a spectral transparency, whose branches were twisted in thread-like traceries of lines and figures, found sustenance where not a foothold of earth was discernible. That such evidences of botanical life should appear in a cavern remote from the sun's heat and light was surprising enough to all the explorers; to Leighton it savored of the miraculous. Ever since the adventure with the Black Magnet the savant, indeed, had drifted into such a state of bewilderment that he was more helpless in grasping and overcoming the difficulties confronting them than those of the party who had little of his learning or experience. Ordinarily he was accustomed to treat with contempt phenomena that to others appeared inexplicable. But here he was as a mariner adrift in midocean, in a rudderless ship, without sails or compass. Everything seemed at odds with the settled beliefs and theories of science as he knew them. Nothing was as it should be. He was thus less capable as a leader than the volatile Miranda who, although fairly well trained in the modern way of looking at things, did not trouble himself to explain the marvels that met them at every turn in their wanderings. "They live in the walls, these people!" exclaimed the doctor, "and they have trees and plants without the sun and rain." That was all that need be said. The fact was a fact, delightful beyond most facts just because it was so outlandish, so opposed to all experience, and it gained nothing in interest or anything else by trying to explain it--although Miranda did, on occasion, take a hand at explaining these puzzling matters.