These galleries, situated in the heart of the wall, are six in number. Each begins about 3 feet 9 inches in front of the stair, and goes round the whole tower on the level till it comes against the back of the stair, which closes it at that end, so that entrance to the gallery or exit from it can only be obtained by stepping across the space intervening between the end of the gallery floor and the steps of the stair. The floors of the galleries are formed of flat undressed slabs, the end of which reach into the walls on both sides. These slabs are about 6 inches thick, and those whose under surfaces form the roof of the first gallery present their upper surfaces as the floor of the second, and so throughout. None of the galleries exceed 5 feet 6 inches in height or 3 feet 2 inches in width, and some of the upper spaces are now much narrower; but as the position of the upper walls has evidently shifted, the original dimensions of the upper galleries cannot be ascertained. Four of the galleries that now remain (for the tower is incomplete at top) are lighted by four vertical ranges of windows all looking into the interior court. One range of fourteen openings is over the main entrance. Another of eighteen openings is over the entrance to the stairs. The third set has seventeen openings, and the fourth is imperfect, many of the lintels having been broken out. The peculiarities of these windows are—(1) that they are placed close to each other, vertically, with merely the thickness of a lintel between each opening; (2) they are wider than they are high, the greatest width being 2 feet 9 inches, and the greatest height not exceeding a foot; (3) they diminish in size gradually from the lowest to the highest; and (4) they do not range so far upwards as to include the two upper galleries, which are windowless. Let us now group the main features of this singular building. It is a circular tower, composed of a dry-built wall 15 feet thick, enclosing a court 20 feet in diameter. The wall rises to a height of 45 feet, and has no opening to the outside except the doorway which gives access to the court. Opening from the court are a series of chambers on the ground floor constructed in the thickness of the wall and rudely vaulted with overlapping masonry. Above these are successive ranges of level galleries, also in the thickness of the wall, each going round the tower, and placed so that the roof of the one below always forms the floor of the next above. These galleries are crossed successively by a stair from which access to them is obtained by facing round in the ascent and stepping across the vacant space forming the well of the stair. The three lower galleries only are lighted, and the windows are placed in vertical ranges so close to each other as to be separated only by their upper and lower lintels.