The next chamber is a loftier vault, and the arching is more decidedly Gothic in its suggestiveness. Two low arches at either side form the portals, far above which a series of pointed arches spring to a height of 70 feet, their summits converging in a polygonal cleft, like the lantern of some cathedral dome. Then we make our way across the sandbanks, between the pools, into the largest chamber of all, with a roof of enormous span, whose breadth dwarfs its height, arching over the sleeping river and the broad slopes of sand, whereon grotesque Limestone monoliths take the likeness of prehistoric monsters sleeping by the waterside. Through the clear water we can discern a submerged arch communicating with more distant caverns. There is a tradition, coming down from the mediæval historians, that unfathomable lakes lie behind the barrier. This is probably true in so far as it points to the existence of enormous reservoirs of water beyond the accessible parts of Wookey Hole, the theory being confirmed by the behaviour of the silt at flood time. Were the hatches belonging to the paper-mill opened, and the water lowered a few feet, an attempt might be made to solve these problems. Mr. Balch did, in fact, at a time when the water was partially lowered, make his way into two unexplored chambers, fed by tunnels submerged a foot or so below the surface. [Illustration: SECOND GREAT CHAMBER, WOOKEY HOLE. _Photo by Dawkes & Partridge, Wells._] [Illustration: ENTRANCE OF THIRD CHAMBER, WOOKEY HOLE. _Photo by Dawkes & Partridge, Wells._]