Having never been able to get any very intelligible account of what they really were, I had supposed that some large rocks rolling down the mountain had got jammed over the creek, by the steepness of the rocky banks on each side, which I fancied would be a very easy mode of building a natural bridge. My idea, however, was very far from the reality. In fact, bridges was an inappropriate name; they should rather have been called caves or tunnels. How they were formed is a question for geologists; but their appearance gave the idea that there had been a sort of landslip, which blocked up the bed of the creek for a distance of two or three hundred feet, and to the height of fifty or sixty above the bed of the stream. They were about a quarter of a mile apart, and their surface was, like that of the hills, perfectly smooth, and covered with grass and flowers. The interiors were somewhat the same style of place, but the upper one was the larger and more curious of the two. The faces of the tunnel were perpendicular, presenting an entrance like a church door, about twelve feet high, surrounded by huge stony fungus-like excrescences, of a dark purple-and-green color. The waters of the creek flowed in here, and occupied all the width of the entrance. They were only a few inches in depth, and gave a perfect reflection of the whole of the interior, which was a lofty chamber some hundred feet in length, the straight sides of which met at the top in the form of a Gothic arch. At the further end was a vista of similarly arched small passages, branching off into darkness. The walls were deeply carved into pillars and grotesque forms, in which one could trace all manner of fanciful resemblances; while at the base of some of the columns were most symmetrically formed projections, many of which might be taken for fonts, the top of them being a circular basin containing water. These projections were of stone, and had the appearance of having congealed suddenly while in a boiling state. There was a beautiful regularity in the roughness of their surface, some of the rounded forms being deeply carved with circular lines, similar to the engine-turning on the back of a watch, and others being rippled like a shirt of mail, the rippling getting gradually and regularly finer, till at the top the surface was hardly more rough than that of a file. The walls and roof seemed to have been smothered over with some stuff which had hardened into a sort of cement, presenting a polished surface of a bright cream-color, tinged here and there with pink and pale-green. The entrance was sufficiently large to light up the whole place, which, from its general outline, gave somewhat the idea of a church; for, besides the pillars, with their flowery ornaments, the Gothic arches and the fonts, there was at one side, near the entrance, one of these stone excrescences much larger than the others, which would have passed for a pulpit, overhung as it