We returned later to the other westerly passage, at the top of the water-pipe. Examining every opening carefully, we noticed many similar communications between the two series, evidently proving that the upper was a very ancient stream course that had been tapped successively until the lower tunnel superseded it as a waterway. Pushing ahead, we soon realised that we had arrived at the richest part of the whole cavern, though also the most inaccessible. The roof came down bristling with spikes and shafts of the purest calcite; the floor was one mass of crystallisation, ridged all over with the rippling lines that form as the crust grows under water. This exquisite scene was continued for hundreds of feet, various and indescribable as a dream, whilst our march onward over the sharp crystals of the floor and through the portcullis that closed every chamber was as painful as a nightmare. Loveliest of all was a long tunnel that once held many pools of water, half-encrusted over with a film of carbonate. Only one of these lucid mirrors remained, but the dried-up basins were as beautiful now as ever, with the bottom and sides covered by a coraline growth delicate in colour as in form. At the end was a small dome-like chamber, where we extended ourselves for a hard-earned rest before facing the toils and tribulations of the journey back. [Illustration: THE CHAPEL: STUMP CROSS CAVERN. _Photo by E. A. Baker._] We thought this expedition to the lower series had exhausted the principal beauties of Stump Cross Cavern, but we were wrong. On our way to rejoin the other men in the Middle Cavern we were much impressed by two large curtains of stalactite, one of them folded and wrinkled, and the other hanging straight down without a curve, but both striped with deep bands of crimson, orange, and golden yellow when a piece of magnesium was burnt behind them. These were equal in extent and brilliance to anything I have ever seen, even in Cox's Cavern at Cheddar. A round tunnel, ribbed and groined with glistening dripstone, and a broad low arch set with pillars and string-like stalactites stretched from top to bottom, led into the long, wide chamber that we dubbed the "Bowling Alley," on account of the stumps and pedestals of stalagmite that stud the floor between the pillars. Beyond it a short passage leads into a grotto to the right, and a very difficult one continues some distance to the left.