The basement is of an irregular figure, a sort of polygon of four very unequal sides, with a curved outer end. It is vaulted, and its outward portion has three, and its inward four hip-ribs, plain, chamfered, and 13 inches broad, springing from the wall without pier or corbel, and meeting irregularly in mitred joints at the crown. The wall is about 12 feet thick, and in two of the sides and the curved end are three round-headed recesses of 7 feet 6 inches opening, intended for loops, but now fitted with windows. The ring-stones of these recesses appear original, and much resemble those in Wakefield Tower. The entrance door from the stairs has a slightly drop arch, and near it another similar but larger door, set in a deep recess, opens into a vault about 22 feet by 16 feet, looped outwards. This vault is a Tudor casemate of brick, but half of it is in the old curtain, and probably old, though lined. As the door is certainly old, this may have been an original mural chamber, or it may have opened on the “terre-plein” before the church vaults were built. The vaulting of the tower is chalk, the ribs and coigns of harder material. Possibly the walls and recesses of this tower are late Norman, of the age of the Wakefield, and the ribs and vaulting early English, or later additions, or, which is more probable, the whole is of one date, Richard I., or John. It is a very curious structure. Bayley says that courses of tiles were seen in the masonry like those found in the adjacent city wall, of the fragments of which it may certainly have been constructed. If the whitewash were removed, and the exposed masonry examined, we should probably learn whether the base of the tower be a part of the ancient _enceinte_ of the fortress, the work of Henry II. or his son. [Illustration: DEVEREUX TOWER.—BASEMENT.] The survey of 1597 shows two circular turrets at its junction with its curtains, and calls it “Robyn the Devyll’s Tower,” or, later, “Develin Tower.” Its present appellation is derived from Robert Earl of Essex, confined here in 1601. The superstructure is modern. Flint Tower was taken down in the last century, and rebuilt of brick, and was again rebuilt in stone, a few years ago. In its present form it is a rectangle, 40 feet square, having a slight interior and bold exterior projection, and its outer face is rounded. The survey of 1597 shows the interior projection and the usual flanking turrets, but the whole of the present tower appears new, and even the exterior base is either new or has been cased. In the curtain, close west, is a modern staircase in the wall. The curtain from Devereux to Flint Tower, 90 feet, though capped with a modern parapet, and casemated within, seems in substance to be old; as does the curtain, also 90 feet, from Flint to Bowyer Tower.