The library occupies the first floor of the south side of the quadrangle opposite to the entrance. It is 79 feet 6 inches long, by 21 feet broad, with ten equidistant windows, about 3 feet 6 inches apart, on each side. At the west end there is an inner library, occupying the angle between the south and west sides of the quadrangle. On each side there are nine bookcases, each 8 ft. 6 in. high, 2 ft. wide, and 7 ft. 6 in. long, divided by partitions into three compartments. I have carefully studied these cases on several occasions, and it seems to me that the only alterations introduced since the original construction are: (1) the addition of about two feet to the upper portion of the case in order to provide additional shelf-room; (2) a slight change in the arrangements of the desk for the reader; and (3) the addition of the catalogue frame, which by its style is evidently Jacobean, to the end next the central alley. Originally each case had two shelves only, one on the level of the desk (Fig. 71, G, H), and the second about half-way between it and the original top of the case (_ibid._ E, F). Before chaining fell into disuse the cases were heightened so as to provide an additional shelf (_ibid._ C, D). At present the number has been further increased by the addition of a fourth shelf above the desk (_ibid._ A, B), and two below it (_ibid._ I, K, L, M). The desks have been altered by a change in the position of the bracket, and by the suppression of the slit through which the chains usually passed, as I shall explain below. The system of chaining used for the lectern-system required modification and extension to suit this new arrangement of shelves. At Corpus Christi College most of the iron-work remains (fig. 70); but it is necessary to go elsewhere to find chained books actually in use. Of such chaining I know no better example than the Chapter Library in Hereford Cathedral, from a study of which I will describe the system, and shew that it is the same as that employed at Corpus Christi College and elsewhere. The Chapter Library at Hereford was originally over the west cloister, and there is evidence that it was being fitted up in 1394, when Walter de Rammesbury, B.D., gave L10 for the desks[334]. The original building has long since been destroyed, and the books were transferred from one place to another until the present beautiful structure was built on the old site in 1897. [Illustration: Fig. 73. Part of a bookcase in the Chapter Library, Hereford.]