Adjoining this Transept on the east is the apsidal Chapel of St. Catharine, for many years in ruins, but rebuilt in 1848, and the floor laid in a combination of marble and encaustic tiles, with borders of incised Portland stone, the incisions being filled with coloured cement; the windows have been filled with stained glass by Mr. Wilmshurst:

The east window, representing the Baptism of our Lord, by John, after a picture by Bassans; given by the Rev. W.G. Townley, of Upwell, Norfolk, as a memorial of his brother, R.G. Townley, Esq., of Fulbourn, for several years one of the representatives of the county in Parliament.

The subject of the other window is from the words of our Lord, "Suffer little children to come unto me;" from a picture by Overbeck: the gift of Canon Selwyn.

We now proceed on our course, and enter

The Nave,

which is of ample dimensions, being 203 feet in length; it has a lighter appearance than many churches of Norman architecture, and may be considered a late specimen of that style, having been finished about 1174. The length originally comprised thirteen bays, one of which has been included in the plan of the Octagon; there are no single cylindrical columns as in many churches, but the pillars are clustered and alternate in size and pattern; the arches appear to be somewhat higher than semicircular, being stilted, or some little way rectilinear before they take the circular bend. Those of the second tier comprehend in each two smaller ones, supported by a much lighter column; each compartment in the upper tier is divided into three small arches, the middle one being larger and higher than that on either side of it. Over the whole aisle on each side runs a broad gallery usually called the "triforium," lighted by Perpendicular windows in the outer wall; and above is the "clerestory," or "clear-story," affording a narrow passage in the thickness of the main wall, lighted by the original Norman windows; thus the height is divided into three parts—ground-story, triforium, and clerestory; and the breadth into the same number—nave, north aisle, and south aisle; probably designed as a type of the Trinity, as it is thought by many that these symbolical considerations were used in the building of churches in early ages.

A new floor has been laid in the Nave[29] in a design which introduces several kinds of stone and marble, each bay in a pattern differing from the adjoining one; the large slab of marble which laid in the second bay from the east, and from which the memorial brass has long disappeared, remains in situ, it is not known to whose memory it was originally placed, but evidently to some dignified ecclesiastic. Towards the west the floor has been lowered so as to shew the bases of the columns which had for many years been hidden. A semicircular roof-shaft runs from the floor to the top of the wall between the bays, but the roof, until lately, was open to view from the floor to the rafters; a new painted ceiling has been executed,[30] which adds much to the grandeur of the building.

This ceiling was commenced in 1858, by Henry Styleman le Strange, Esq., of Hunstanton Hall, and the six western bays were designed and the chief parts executed by him, and finished in 1861; his lamented decease in the following year gave rise to some fears as to its completion, but his friend T. Gambier Parry, Esq., undertook to finish the work so ably begun, as a token of affection to his memory, and it now presents a beautiful series of pictures in compartments, forming, as it were, a carefully studied epitome of the sacred history of man as recorded in Holy Scripture; and exhibiting specimens of skill and taste executed by two gentlemen of independent fortune that may be almost considered marvellous.

It may be mentioned that the ceiling is upwards of 200 feet long, and is 86 feet from the floor, and the general size of the principal figures in the painting is nine feet.

The central subjects are arranged in chronological order from the west, each being surrounded by a border varying in form, and containing a legend; in the ten western bays the subjects are supported by figures which are for the most part representations of Patriarchs and Prophets, carrying scrolls[31] upon which are written words of their own, bearing more or less forcibly upon the coming of the Messiah. The eleventh subject has, properly speaking, no supporters, but the Shepherds and the Magi are so arranged as to carry on the artistic effect of a central group with conspicuous lateral figures. In the twelfth and last subject, the picture extends entirely across the ceiling; in the centre is the Lord Jesus in His glorified humanity, seated on a throne, round about which is a "rainbow like unto an emerald." Above His head is the choir of Seraphim, painted in prismatic colours, and reflected in the "sea of glass before the throne." On the right and left are the figures of the twelve apostles seated; beyond them, on the dexter side, are two archangels, St. Gabriel, "the angel of redemption," holding the standard of the cross, and St. Raphael, holding a sword with its point downwards, expressive of victory and peace; at their feet rise three figures, typical of the blessed received into glory. On the sinister side are also two archangels, St. Uriel holding his sword downwards, and St. Michael spearing the dragon, expressive of the condemnation of, and victory over, sin. The figure of our Lord is connected with the tree of Jesse by its last branches, which break into scrolls and golden fruit at His feet.