The principal entrance is by the south door of the nave. This has been cruelly damaged, indeed nearly destroyed, but what remains is of great interest, owing to its very close resemblance to the noble western doorways of Rouen cathedral; the doorway is double, with eight shafts in each jamb, the alternate shafts having figures in front of them, as in the west doorways of Chartres; whilst the tympanum is similar also, having a figure of our Lord, surrounded by the emblems of the four Evangelists. Portions of archivolt enrichments and other sculpture have been dug up in the neighbourhood of this doorway and carefully preserved, and they appear to me, by their vigour and grandeur of character, to be undoubtedly the work of the same artist, and possibly portions of this once magnificent but now woefully mutilated entrance. It is in the interior, however, of this church that the effect is finest and the architecture most noble. The whole is very uniform in character throughout, marked by great solidity of construction and proportion, and by the boldness and distinctness of all its architectural detail. The triforium throughout opens with two arches enclosed within another, the spandrels being unpierced, and throughout the church it is groined; nor must I forget to say, that at the present day the spacious area it affords is turned to some account; for, when I was there, on one side they were making the organ pipes, on the other constructing the organ, and in another part the carpenters were busy upon the organ case; and the Curé assured me that he not only had the satisfaction of seeing everything executed in the best possible way, but at the same time there was no inconvenience, and no want of reverence, on the part of the workmen. The clerestory consists throughout of lancet windows, the lower portions of which are filled in with an arcade in the manner I have described in the choir of S. Remi, at Rheims. The sculpture throughout this church, though almost entirely confined to foliage, is very instructive, and at the same time a little puzzling; for we see almost side by side work of the best Byzantine character--almost rivalling the sculpture we see in Venice--and distinctly thirteenth century French work, whilst the building itself shows no corresponding diversity, and I can only suppose, either that the sculpture was in hand much longer than the building of the church, or that two sets of sculptors were at work, the one educated in a Byzantine school, the other influenced by the more developed school of the Île de France.