St. Catherine City, which lies beyond, is at the intersection of the Blue Spring Branch and Blackall Avenue with the main passageway. The latter, recently named in honor of the veteran cave-hunter, Dr. C. R. Blackall, of Philadelphia, ends in a funnel-shaped pit bearing the name of Symmes’ Pit, probably in memory of Captain John Cleves Symmes, of Newport, Kentucky, whose theory gained much attention formerly—that our globe was a hollow sphere with an opening at the poles, and that within were races of men and animals different from those on the surface. At a public meeting held at Frankfort, a resolution was adopted to the effect that the United States Congress should fit out an expedition to the Arctic Circle under his command, in order to find, if possible, the mysterious Polar pit for which this Cave pit was named. Our course, however, leads us to Waldach’s Dome (in memory of Charles Waldach, the pioneer in cave-photography) and Hains’ Dome (in honor of his successor, Ben Hains), both of them symmetrical and noble domes, rising to oval ceilings above smooth floors of sand. In the Garret we find flakes of Epsom salts like those found in the Snow Room. Bending low through Mayme’s Stoopway, we reach what to Dr. Call and myself seemed to be an impenetrable wall, to which we gave what we thought the fitting name of “Ultima Thule.” In the year 1908 Mr. Max Kaemper, of Germany, undertook a complete exploration of Mammoth Cave, assisted by Edward Bishop, guide, the results of which are exclusively for the owners of the Cave. Their observations led them to suspect that a certain tumble-down in the Sandstone Avenue might be identical with the tumble-down known as Ultima Thule. Hence they attacked a crawl-way near the latter, and by patiently removing many limestone fragments they wormed their way through to an oval hall, one hundred and sixty feet long by one hundred and twenty feet wide and sixty feet high, now named, for its discoverer, Kaemper Hall. An unseen waterfall, by whose music they had been led onward, was now seen to dash down an abyss they named, for the guide, Bishop’s Pit. Another is the “Parrish Pit,” so called for Norman A. Parrish, of Buffalo, New York. These are the first of a series of eleven pits, the others not yet being named. Fifty steps to the right is a short passage where an iron gate is now fixed, opening into a symmetrical chamber seventy-five feet in diameter and of about the same height, rising by vaulted arches and closing above in a beautiful circle. This is Elizabeth’s Dome, named for a sister of Mr. Kaemper. The exit is by the Grand Portal, an arch sixty feet wide and fifty feet high, commanding one of the most magnificent views in all the underground world.