I have already explained to you the system of covering in these temples; the ornamental tiles are disposed in the Theseum, one over each triglyph; in the Parthenon there was also one over each metope; in the first building therefore, they were a little more than 4 feet apart, in the latter about 3 feet 6 inches. For some unknown reason, the tiles themselves do not correspond with this disposition of the ornaments; the latter are therefore entirely detached from the former; and the real stops of the convex tiles are small triangular projections, placed back, so as not to be seen from below; three of them occupying the dimensions of two antefixæ and the intervening space. Vast heaps of ruins lie around, as you may suppose, but on the south side, part of a continued basement of coarse limestone may be seen under the three steps. Three courses of this limestone are exposed, and part of the fourth; each about 1 foot 9 inches in height. The uppermost projects 4 feet from the step, and the upper surface is sunk about 5 inches, probably to receive a covering of marble: the next course projects 18 inches, the two lowest each about half an inch. I cannot tell how far this basement extends, or what its whole height may be; but in front there is an appearance of vaults, which puzzle me much more, as they seem to imply a very considerable elevation of the front of the temple above the ground on which it stood. I only perceived them by some holes broken in at the summit, and they are too much filled up with rubbish to enable us to trace their extent; perhaps they were only partial hollows, filled up in ancient times as well as in modern.