To the west of this house we find the #ruins of the Infirmary#, which contained a long hall with aisles, and a chapel at the east end. The hall was used as the hospital, and the aisles were sometimes divided into separate compartments; the chapel was really part of the hall, with only a screen intervening, so that the sick brethren could take part in the services. This infirmary survived until the Reformation period, but not without undergoing alterations. Before the fifteenth century the south aisle was devoted to the use of the sub-prior, and the chancel at the east end of the chapel was partially restored about the middle of the fourteenth century. A large east window was put in with three-light windows on each side. In the north wall there is a curious opening, through which, perhaps, sufferers from infectious diseases were allowed to assist at the services. On the southern side, the whole row of the pillars and arches of the chapel, and some traces of a clerestory, still remain. On the wall are some traces of paintings, which are too faded to be deciphered. Such of the pillars and arches of the hall as still survive are strongly coloured by the great fire of 1174, in which Prior Conrad's choir was destroyed. [Illustration: RUINS OF THE MONKS' INFIRMARY.] [Illustration: THE BAPTISTERY TOWER.] Westward of the infirmary, and connected with St. Andrew's tower, stands a strikingly beautiful building, which was once #the Vestiarium, or Treasury#: it consists of two storeys, of which the lower is open on the east and west, while the upper contained the treasury chamber, a finely proportioned room, decorated with an arcade of intersecting arches. An archway leads us from the infirmary into what is called the Dark Entry, whence a passage leads to the Prior's Gate and onward into the Prior's Court, more commonly known as the Green Court: this passage was the eastern boundary of the infirmary cloister. Over it Prior de Estria raised the _scaccarium_, or checker-building, the counting-house of the monastery.