Sec. 47. But there are further instances--and these, perhaps, are the most instructive--where aisles were not merely built at two different periods, but where the growth of one or both aisles was gradual. As an instance of this, may be cited the beautiful church of Raunds in Northamptonshire. Raunds seems to have been one of those cases in which the Norman chancel and nave were of the same width, and possibly were undivided by any chancel arch. In the thirteenth century the west tower and spire were built, and a broad south aisle was added to the nave. This aisle was of four bays, and the point at which it stopped probably marked the dividing line between the nave and chancel. However, the builders certainly intended to carry on the aisle eastward, as a south chapel to the chancel, which they now rebuilt and lengthened. Early in the fourteenth century, the south aisle was continued eastward, an arcade of five bays being added to the four bays already existing. The new bays were made rather narrower than those in the earlier part of the arcade. A strange feature of the new work was the insertion of a chancel arch, the south pier of which bisects one of the new arches. Thus, while three bays and a half of the new arcade belong to the chancel and quire, a bay and a half belong to the nave. The arch dividing the south aisle from the chancel chapel springs from the pier between the end of the old arcade and the inserted pier of the chancel arch. At the same time, the outer wall of the south aisle seems to have been practically rebuilt, although much of the older work was retained. There may have been a thirteenth century north aisle as well. Whether this was the case or no, a new north aisle and arcade were built during the fourteenth century. The aisle was set out in seven bays, six of which contained broad three-light windows, while a north doorway was made in the third bay from the west end. The east wall was built on foundations in a line with the chancel arch, while the west wall was in a line with the tower arch and west wall of the south aisle. It is obvious, therefore, that the planning of the new aisle was totally different from that of the older aisle and chapel. However, when the builders came to their arcade, instead of building it in seven bays, as the new aisle demanded, they built it in five, setting their new columns in a line with those on the opposite side. But while, on the south side, there was an awkward half-bay between the end of the arcade and the chancel arch, a solid piece of wall was left between the north pier of the chancel arch and the eastern respond of the new arcade. A compromise was thus effected between the aisles, and an appearance of regularity was ensured. Directly, however, one begins to examine the plan of the church, and to trace the transverse lines from window to window, and buttress to buttress, it will be found that only in one place can a line