aisle wall opposite the three bays, west from the crossing, would appear to have been built early (see Figs. 228 and 229). The buttresses are of the flat Norman form, the three eastmost windows are moulded in three orders, with a label enrichment like the choir aisle windows, while the two windows to the west of above, although round, have mouldings of a first pointed character, and were, doubtless, finished at a later time (see aisle window in Fig. 236). In the south aisle of the nave the east window is similar to those of the north side, but the others, extending as far as the south doorway, have, in the interior, mouldings indicating a more advanced date. (Fig. 237.) Externally, these windows have been restored. There would appear to have been a good deal of time spent over these aisle walls extending as far as the north and south doorways, and the main piers and arches within them were probably erected at the same period. Both of the above aisle walls have a Norman interlacing arcade (see Fig. 237) running along the interior below the windows. In these arcades, and those of the transepts, various varieties of chevron ornament occur. The north aisle doorway (see Fig. 236) is Norman in detail, but seems to have been restored at a late date. The interior mouldings are similar to those of the three west doorways. The doorway in the south aisle retains its old Norman arch and shafts in the interior, but has been altered externally (Fig. 238). The nave piers may have been continued as far as the above doors about this time, together with the triforium, but the upper part of the nave walls and the vaulting are later.