The east chamber, 53 feet by 22 feet, has a recess 7 feet wide in its south end, which ended in a loop, now converted into a window. In its right or west jamb is a fireplace; in its left a door opening into a mural chamber 18 feet by 11 feet, with a loop to the south, and from the east end of which a door opens upon a staircase of the forebuilding. This door and the window above it are of Tudor date, but there are indications that there was an original door here, of which the Tudor frame is a replacement. In the exterior wall is an arch of relief in fine ashlar, which matches in size with the vault within, and looks as though intended to protect an original door. In the east wall of the great chamber is a door opening into the lobby, in which six steps descend to the north-east staircase. From this lobby a door leads into a vault 24 feet by 12 feet, with a recess in its north and south walls, and a loop in its east end. From this a short passage leads into a second vault, 17 feet by 2 feet, with a loop to the north. These two vaults are placed below the upper vestibule and great guard-room of the forebuilding. In the north wall of the great chamber, at the east end, a small door opens into a mural gallery, 16 feet by 4 feet, with a loop to the north, and which ends in a chamber 5 feet by 6 feet, also with a loop to the north. Above this gallery is a recess 7 feet wide, raised about 10 feet from the floor, to clear the gallery. Its loop is replaced by a modern window. The west chamber, 52 feet by 20 feet, has also a 7-feet recess in its south end, with a modern window, and in its east jamb a door opening into a mural chamber, 13 feet by 9 feet, with a south loop, and a fireplace in the east wall. This, and the fireplace already mentioned, are placed back to back, and, though with Tudor fittings, may possibly be original. In the north wall of the great chamber is a high recess and window, similar to that in the east chamber. In the west wall are four openings; that at its north end opens into a chamber in the north-west angle, 23 feet by 10 feet, with loops to the west and south. From it branches a passage 18 feet by 4 feet, in the north wall, which leads under the high window recess to a chamber 7 feet by 6 feet. Both passage and chamber have loops to the north. Next follows a window recess of 6-feet opening at the floor level, rising by four steps to the modern window; then a door opening into a mural chamber, 20 feet by 9 feet, with a fireplace in the east wail and two loops to the west. Finally is a door opening upon the lobby which leads to the south-west staircase, rising three steps, and having a loop to the west. Besides the three fireplaces in mural chambers, there were two others under arches of 12 feet span, one in the centre of each face of the cross-wall. These, however, are closed up. In the same wall, at the north end, is a door between the two chambers. [Illustration: DOVER KEEP. SECOND FLOOR GALLERY. SECOND FLOOR.