We know indeed that some of the earliest Roman buildings were constructed of Roman bricks or tiles laid evenly upon one another (the opus lateritium), but the tiles of the first two centuries were remarkably thin, as contrasted with later specimens. They vary, at different periods, in length from 15 inches to 2 feet, and in thickness from ¾ inch to 3 inches. Unfortunately little credence is now given to the ingenious rough-and-ready rule, formulated by Mr Parker, that where (including mortar) there are ten bricks to one foot, the wall is of the first century, as in the arches of Nero; where eight bricks, of the second century, as in the villa of Hadrian; where six bricks, of the third century, as in Aurelian's wall; where four bricks, of the fourth century. We may lament the non-acceptance of this rule, for, were it true, we might confidently assign the early wall of the chancel (containing four bricks to a foot) to the fourth century, which is the exact date that is claimed for it!
With regard to the foundations, those in the chancel are of flint-stones and mortar, with a footing of a single course of Roman bricks, while in the nave we find a mixture of sandy mortar and crushed flint, topped with courses of Kentish rag-stone, and one or sometimes two courses of brick.
Closely connected with the walls are the buttresses. Of flat pilaster buttresses there are at the present moment (a) one on the south side of the chancel; (b) two at the south-east corner of the nave, at right angles to each other; (c) one at the north-west corner of the nave, the corresponding buttress at this place having been cut away. In addition to these, there is an evidently later one on the north-east of the nave, and a semi-circular buttress in the middle of the south wall. They have all been repaired very frequently, especially at the top, and it is difficult to determine which stones are original, and which have been inserted afterwards. The sole remaining buttress in the chancel has been mutilated in a painful manner. Not so many years ago, before the modern quoins of Caen stone were added, it was largely composed of Roman bricks similar to the walling. The other flat buttresses on the south side project 6 inches from the wall, and, as we see them at present, consist of blocks of rough-hewn Caen stone to the height of 4 ft. 6 in., and, above that, of Roman brick, considerably patched.
In themselves flat pilaster buttresses furnish no evidence as to date, since they are found alike in Roman, Saxon, and Norman buildings. It is contended by Mr Livett that the buttresses in the nave are Norman, or (at any rate) insertions of a later date than the adjacent wall—but only those at the south-east angle have been explored, where the foundations seem to be of a whiter, harder mortar than those of the wall, containing large stones, but no small angular flints. It is too early as yet to pronounce any positive opinion on the point.
Special attention has often been called to the semi-circular buttress, because this shape is uncommon, though something like it is found at St. Peter's, Northampton, at the Church of St. Remi at Rheims, and elsewhere. The outstanding portion of it measures almost exactly three feet in circumference. It cannot have been made (as some have supposed) to contain a staircase, because there seems no reason whatever for a staircase at this particular place, the rood-loft being several feet eastwards. Others have conjectured that the old church might have ended somewhere near this point, and that then the buttress would have had something to do with the support of the western front, or have been a staircase up to the old belfry. But there is no foundation for this surmise, which is disproved by the fact that the external plaster extends on each side of the buttress, and the character of the south wall is absolutely unbroken. This external plaster, indeed, is probably not Roman, though it
is composed to some extent of pounded brick. The buttress bears little or no resemblance to the lofty semi-circular projection occasionally found in Saxon towers. Its object must be left in a state of obscurity, and it may perhaps have been a mere freak of the builder.
