Occasionally, as at Chipping Ongar, we find indications of a rood-beam having been placed across the _east_ end of the chancel, immediately above the altar, and, of course, carrying on it the rood. At _Stow_, in the chancel, in the jambs of the side windows north and south of the altar space, there was a fracture and displacement of the mouldings exactly in the same place in each, no doubt to support a beam for the crucifix. In some cases these altar-screens were double walled, with a kind of platform or gallery on the top, whereon the sacred relics could be displayed, while the space between the walls served as a sacristy or feretory. At _Lincoln Minster_, for instance, the original reredos-screen was double, with a long narrow space, serving as a sacristy, between the two screens lighted by the quatrefoils, still open in the back screen wall, with aumbries, &c., in the walls, and a newel-stair at the north-west corner leading to the tabernacle above. A similar arrangement, according to the late Precentor Venables, of a narrow slip sacristy behind the reredos may be seen at St. Nicholas’, Great Yarmouth, and at Llantwit in South Wales. A somewhat similar example exists at Beverley Minster; at the back (_i.e._ eastwards) of the altar-screen is a platform, reached by a stair at the north end, and supported by three elegant arches on shafts, with a vaulted roof, an excellent specimen of Decorated work. At York Minster, again, there was a double screen— “The wooden screen behind the high altar of the same work as the rest of the quire, surmounted with triangular coats-of-arms containing each a rose, &c., of the common form, supported behind by angels. It was handsomely painted and gilt. It had a door at each end which opened into a place behind the altar, where antiently the archbishops used to robe themselves at the time of their enthronization, and thence proceeded to the high altar, where they were invested with the pall. On the top of this screen was a gallery for musick.... By the taking away of this the altar was carried back one arch to a stone screen behind it of excellent Gothick architecture.” Professor Willis believed that this was the place where the portable feretrum or shrine of St. William was kept. At Winchester Cathedral, behind the high altar (the beautiful altar-screen of which will be mentioned presently), is a raised platform in the feretory, cut off from the choir by the reredos-screen, with originally an arcade in front of it, making a platform of about 10 feet broad. This probably sustained the shrine of St. Swithun, and also those of SS. Birinus, Edda, and Ethelwold. The eastern face is ornamented with tabernacles of Decorated work, and the floor under the platform is carried by a small vault, to which entrance is gained below the range of tabernacles. This vault is supposed to be the “Holy Hole” of the records.