The vault construction in the east annex shows a variation from that of the main palace. Instead of the long tubes running parallel with the barrel vaults, the masonry between the parallel barrel vaults of the annex is lightened by short compartments set at right angles to the vaults. Plate 39, Fig. 3, shows this construction between the vaults of 143 and 146 and the ruined vaults of 142 and 145; Plate 42, Fig. 1, the same construction between the vaults 144, 141, and 147, and the ruined vault of the passage 148. This system is an improvement upon the tubular scheme, inasmuch as it fills in the space between the vaults more completely and gives greater solidity to the roof. Moreover, it has the advantage of leaving no long inaccessible tubes to serve as a home for birds and snakes. The decorative effect of the openings of the tubes is lost, but it was not needed in the blank east and west walls of the annex, nor yet in the arcaded north wall. The fact that a similar system of small compartments is to be observed in the building outside the palace to the north (though they are here laid parallel to the barrel vaults) leads me to suspect that it must have been built at about the same period, and is therefore a later addition to the original plan. It is completely detached from the palace, but it stands in line with the west wall of the palace and parallel to the north wall (Plate 43, Figs. 1 and 2). It is separated by a distance of 13·25 metres from the face of the arcades of the north wall. It was itself constructed at two different periods. The older portion lies to the south, nearest to the palace, and consists of a large open court, J, 33·20 metres from north to south and 24·80 metres from east to west, flanked on the east side by six vaulted rooms. The southernmost of these six rooms, 153, is 9·55 metres from north to south and 7·80 metres from east to west. It is separated from court J by a wall 1 metre thick, but on the east side its wall is 1·90 metres thick and shows upon the exterior traces of an outer stair, leading to the roof, which passed over the wide arched opening in the east wall. The vault, which must have stood two stories high, like the vault of the great hall, has fallen. The remaining rooms, 154-158, have doors in the east wall and small loopholed windows in the west wall (Plate 42, Fig. 2). The rooms are divided across the centre by a transverse arch and vaulted in two compartments, the vaults running east and west. Court J had a cloister upon the west side; it has entirely disappeared, but the spring of its vault is visible on the inner side of the west wall. Probably the vault was carried on the east side by columns and arches. Four round towers project at irregular intervals from the exterior of the west wall (Plate 44, Figs. 1 and 2); they have the same diameter as the towers in the outer palace wall. The southernmost is about 3·40 metres from the southern angle of the court--an exact measurement is