The interior, viewed down the nave, and showing its great length and that of the choir, impresses one with a graver sense of unity in the manner of building than is possible to conceive with regard to the exterior. The height and length both approximate that of St. Ouen, and, though the nave rises only to ninety-eight feet, an effect of greater loftiness is produced by the unusual quadripartite range of openings from pavement to vaulting: two rows of arches opening into the aisles before the triforium itself is reached. The lantern at the crossing supports the ironwork spire, and admits light to the centre of the church, only to a small degree, however. The south transept, like that of the north, with its ample double aisles, is of great width, and, were the framing of the great rose window of less angularity, it would indeed produce a remarkable effect of grandeur. The other windows, and the arcading of the triforium, are singularly graceful; not lacking either strength or firmness, though having no glass of great rarity or excellence. In this transept is the altar of St. Romain, a seventeenth-century work of little pretensions. The north transept contains two features which give it immediate precedence over any other, when viewed from within: its gracefully traceried rose window and fine glass, and the delightful stone staircase leading to the chapter library. Mere description cannot do this stairway justice. Renaissance it certainly is, and where we might wish to find nothing but Gothic ornament, it may prove somewhat of a disappointment; but it is magnificent. Its white marble balustrading gleams in the strong light thrown from the western transept window and gives an unmistakable note of richness and sonority. It was built late in the fifteenth century under orders of Cardinal d'Estonteville. The upper doorway leads to the treasury, and that of the first landing to the chamber in which were formerly kept the bibliographical treasures, now housed in the special building which forms the western wall of the outside court. The north and south aisles of the nave are broken into by a series of chapels, the chief of which are the Chapel to St. Stephen in the base of the _Tour de Beurre_ and _du Petit St. Romain_, where an abbe or cure speaking the English tongue is often to be found. On the south side is a chapel containing the tomb of William Longsword, second Duke of Normandy, and son of Rollo.