The vaulting of the side aisles, or rather that over the _schola_, was arched from pier to pier longitudinally and transversely, the quadrangular spaces being in all probability simply groined; but a fragment of box tiles found almost leads one to think that these spaces were vaulted by a domical vault, springing either from pendentives in the angles of the vaults, more common in later work, or from a slight cornice on a level with the apex of the arches. The vault, if there was one, over the semi-circular _exedrae_ must have been hemispherical. From the number of roofing tiles of local stone, shaped into hexagons, found, I think these arcades were roofed in with them, placed overlapping each other, giving a very good effect. Similar tiles were dug up at Wroxeter, and I have found slates of the same shape in the Roman villa I have been excavating for Mr. Chas. I. Elton, F.S.A., M.P., at Whitestaunton Manor. The form of these slates deserves copying; a roof covered by them is far lighter than that of rectangular slabs and more picturesque. The walls on the sides towards the hall, and externally, so far as I have been able to ascertain, are covered with the usual red plaster, shewing that they were internal walls; but from a piece of dentilled, or rather blocked, cornice, which fits the curve of one of the _exedrae_, I believe the walls were carried up on the north and south above the roofs of the adjoining rooms and corridors of the baths, so that they formed a feature in the elevation and afforded a broken skyline to the composition. The vault over the centre rose considerably above these walls, a portion of the centre of which may have been partially open for the emission of steam and the admission of light. Some square blocks of lead, that were the yotting of bars of metal, rather favour this idea, and suggest that these metal bars were a portion of the machinery by which a brazen shield (_clipeus_) was suspended, or secured, so that by raising or lowering it the temperature of the hall might be regulated as described by Vitruvius. In the excavations we found an _ante-fixa_ that must have fallen from some portion of the roof. It appears to be intended for a lion, but it is much broken.