In the south-western quadrangle, in addition to the caserns, the storehouse, and the cooking-house, there was a straw barn, from which, whenever necessary, fresh straw was served out for the prisoners’ palliasses. In the enclosed court near the turnkeys’ lodges was the black hole, where prisoners were confined for gross offences. This den of misery contained twelve cells, each secured by bars and padlocks, and had a cramped strongly fenced airing-court in front of it. [Picture: Plate IV.—The Outer Side of the Wall] The north-eastern quadrangle was mainly given up to the hospital. Of the four caserns in the early years of the Depot, two, but later three, were fitted up for the reception of the sick and wounded and for the accommodation of the surgeon and assistant surgeons, the matron sempstress and the hospital attendants. Of the hospital blocks, one was set apart for the officers and other prisoners of similar social status. In the enclosed court behind the turnkeys’ lodges were the special accessory buildings of the hospital, and in the corner behind the caserns was the mortuary, where, between their death and their burial, were laid the bodies of 1,770 unhappy men whose fate it was to end their captivity in a foreign grave. In this quadrangle, as shown in Lieut. Macgregor’s plan, was, in the year 1805, erected the surgeon’s house, which was a substantial brick building, with an enclosed garden; this was built in the second period of the war after the Peace of Amiens, about eleven years before the demolition of the barracks. After the closing of the Depot, when peace was declared in 1814, we find Mr. George Walker the surgeon, on vacating his post, making application for permission to remove the young fruit trees which he had planted in the apparently newly laid-out garden. {24} In each quadrangle a space of about two acres was unoccupied by buildings, and constituted the airing-ground, in which the prisoners spent the greater part of their waking lives. This outdoor life, from sunrise to sunset, except in bad weather, was enforced by the Prison Regulations. These airing-courts were bordered by a flag pavement, which enabled the prisoners to use them in any but the worst weather.