Already we had struck the water in two or three places, but had not found it in the main passage. Now we crossed a long pool or runnel of stagnant water, which came in from under the rocks to the south-east, and climbed into a tight little curving tunnel that led back to it in a semi-circle. Beyond it, I found myself in a rift chamber, with the water coming in from under the rocks at one end, and flowing out in like manner at the other. There seemed to be no egress, till suddenly I noticed that the niche in which I was sitting was the end of a small horizontal hole or dry water-pipe, striking off at right angles. But my companion had found the tunnel too much for him. The sides bristled with points of rock, and pressed in so close that one could only wriggle through by fractions of an inch, stretched at full length on the left side. Now he made a stout attempt to get through underneath, in the water tunnel. I heard the sound of wallowing, and then my friend's head and shoulders came splashing in at the bottom of the cave, his body dragging after through water and mud. But again he stuck fast, and announced that he would give the thing up. It was not wise to go on far alone, for fear of being left by any accident without a light; but in order to make a reconnaissance for future work I pushed through the water-pipe, and to my delight found myself in another horizontal tunnel running parallel to the main chamber. Crawling ahead, first over a clay-lined floor, and then over splinters of Limestone mixed with stalagmites, I emerged presently into an open passage, 25 or 30 feet high, with the stream peacefully reposing in one long pool at the bottom. It appeared to go on indefinitely, and I might have gone farther, but for the present determined to leave off the exploration at this point. The parallel tunnel seemed to be going straight back towards the cave mouth, and it looked as though it might form a short cut home. As a matter of fact, this was a right branch striking off from the point where our man had stuck fast. By crawling in his direction and shouting, I made him hear, and at last saw his light through a chink only three inches wide. Fallen blocks of Limestone choked the tunnel at his end, where it leaves the main passage near the roof, and in its present state this branch of the cave was practically invisible. We shifted several big stones, however, and in a few minutes my friend joined me, pleased enough to find a way out that saved the discomforts of his recent journey. He had had the misfortune to array himself in white flannels, and now the state of his garments was so deplorable that he straightway hid himself in the river, like the pseudo Marquis of Carabas, until more presentable clothing could be fetched. [Illustration: LOWER CEIRIOG CAVERN. _Photo by E. A. Baker._]