This chasm is now quite filled up. The terrace extending from Grinfield-street to Miss Mason's house is threaded with passages, vaults, and excavations. At the northern corner there is a tunnel eight feet high, and as many wide, which runs up from what was once an orchard and garden, to a house in Mason-street. The tunnel is, I should think, 60 yards long. As the ground rises up the hill, there are several flights of stone steps with level resting-places. About two-thirds up, where the first flight is encountered, may be seen a portion of a large vault which runs a short way southwardly. A small portion of the top of the arch, between it and the steps, is left open, but for what reason I never could make out. The further end of this vault opens into another great vault, which I shall presently describe. The passage is very dry, but the air has a cold "gravey" taint, very unpleasant to inhale. At the second landing there is a sort of recess, into which rubbish from the garden above is shot down through a spout or funnel. At the top of the passage is a doorway opening upon the back of a house in Mason-street. This passage or tunnel was evidently intended for a mode of communication between the house and the orchard. In the garden or orchard, and near the tunnel mouth, were four lofty recesses, like alcoves, three of which were four feet deep. In one of those recesses, which was carried much further back than the others, the stones were lying as they fell, and there was a channel on one side of the flooring which seemed to have been intended for a drain. Through a large folding gate access is obtained from Smithdown-lane into a wide passage or vault, in shape like a seaman's speaking trumpet. It is broad enough to accommodate two carts at least, and has been used when the stone has been carted away from the delph at its eastern end. This vault is constructed of brick. It gradually deepens at the eastern end, and is about 15 feet wide, and 20 high. At the opening it is not more than 15 high. The top outside is covered by soil, and forms part of the garden previously mentioned. At the left hand side of the tunnel end will be found a vault, running northward for about fifty or sixty feet. The end of this vault is the limit of Mr. Williamson's property. The tunnel already described as running up to Mason-street crosses the top of this vault. This vault is about thirty-six feet wide and perhaps thirty feet high, but the floor has been considerably raised since Mr. Williamson's time by debris and rubbish of all sorts thrown into it. In the right hand corner of the vault, about ten feet from the ground, there is the mouth of a tunnel which runs up first towards Mason-street, it then turns and winds in a variety of ways in passages continuing under the houses in Mason-street, and opening upon many of the vaults. To the left of the entrance vault, there is a large square area from which immense masses of red sandstone