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234 MedicBval Military Architecttire. The third tower is 50 feet from the second, and projects to the south. Here also has recently been discovered a chamber some- what similar to the dungeon already mentioned, also not vaulted, and of very rough masonry, as though a mere foundation intended to be filled up with earth. These two last towers are blocked in by later masonry, the first within, the latter both within and without, as it projects into the buildings of the gateway. As this tower could never have been intended to be thus concealed, it points to the conclusion that the keep was built before the wall of the inner court. Besides these three half-round towers is a fourth, rectangular, and a much larger work, to the north, forming a part of the exterior line of defence. This is known as Thorpe's Tower, and the family of that name are said to have held their adjacent estate of Wanswell by the tenure of its defence. This tower is 64 feet long by 1 7 feet deep. It forms a part of the curtain, having a very slight interior projection. At each end it expands into a square turret, that to the west 17 feet, that to the east 20 feet. The western turret and the body of the tower are thought to be solid, which is very improbable. They are not unlikely to have been filled in with earth to increase their power of resistance when the castle was battered from the churchyard. The eastern turret contains a square well-staircase of fifty-four steps, which leads to the battlements, and has a mural chamber on its way. The entrance below to this staircase is by an original full-centred arch, partially blocked up. This tower is somewhat higher than the curtain, with which it does not communicate. It is said to have been originally higher by a few feet more. Even at present it is the highest part of the castle, and hence the family banner is displayed. Below and outside this tower, to the north, are some modern offices. Between Thorpe Tower and the Well Tower is seen in the wall the outline of a recess for a loop, and above it a segmental arch and Norman moulding, now closed up. The whole south side of the keep area is occupied by a block of building, about 80 feet long by from 20 feet to 30 feet deep. No doubt part of this building may be original, but by far the more prominent part is evidently modern, and sadly out of place. It covers the rear of the two southern half- round towers, which are thus not seen from within. The entrance to this keep is peculiar. Usually, as at Tamworth, Lincoln, York, Cardiff, and Arundel, the entrance to a shell-keep was at its ground-level, and that of a rectangular keep, as at Castle Rising and Dover, at its first or second floor. Here, however, both conditions may be said to be fulfilled, for although the entrance is on the ground level as regards the interior of the keep, it is the full height of a first floor above the ground outside, and this height is gained by an exterior stair, guarded by a middle and lower gate, and above the latter by a regular tower. This forebuilding is common to rectangular keeps, but does not occur elsewhere in shell keeps. Here the Forebuilding i-s, 72 feet in length, and is applied to the south-east side of the keep, or that within the court. In breadth