Beyond the Lady Chapel is the window of the north choir aisle; and beyond this again the eastern termination of the Derby Chapel. This contains a seven-light window. Passing round the north-eastern corner we see the =Ely Chapel= projecting from the second bay to the west, with four-light windows in its eastern and western walls, and a five-light window on its northern face. From the fourth and fifth bays, counting from the east, projects a low building with a battlemented parapet, a door and square headed windows, erected to contain the hydraulic apparatus used for working the bellows of the organ. To the west of this is a small doorway with an ogee head leading into the ante chapel of the Derby or John the Baptist's Chapel. This is the last bay of the eastern division of the church. The next bay, the north wall of what was once St. James' Chapel, contains a five-light window. After two more bays, comprising the chapel of the Holy Trinity, we come to the registry, and see the north porch projecting from the last bay but one. This bears a general resemblance to the south porch, save that niches take the place of windows on the east and west faces of the upper story, and that the stair turret stands on the west side at the angle between the porch and aisle wall. The following inscription may be read running round the porch commencing on the eastern side. "To the glory of God and in loving memory of James Craven this porch and registry are erected by his children 1888." The west window of the outer north aisle has seven lights, and that of the inner aisle five. As on the south side so on the north, the tracery is not the same in all the windows. Those on the north side of the Derby Chapel and the Ely Chantry resemble each other; the next is a short window above the doorway; the next, which is known as the Gordon window, is entirely different; the next three have tracery similar to that of the windows of the Derby Chapel. The parapet along the north walls of the church, like that along the south walls, is pierced and battlemented, the design differing in different parts. The parapet of the Lady Chapel, however, is not pierced, but is simply battlemented. The parapet on the clerestory on both sides is a modern addition, and is considered by some to be no improvement on the old form which ran in an unbroken line from end to end of the church, and gave an appearance of greater length than that given by the present arrangement, with its line broken by battlements and pinnacles. The two octagonal turrets that rise from the east end of the clerestory walls with their crocketed pyramidal terminations form a pleasing feature.