Sec. 30. The nave of the Norman aisleless church was usually short, and, where the church was entirely rebuilt, rather wide in proportion to its length. The naves of churches like Garton-on-the-Wolds or Kirkburn in Yorkshire, give the effect of spacious halls, of no great length, but wide and lofty. It cannot be doubted, however, that the fabric of the Saxon church was frequently kept, or that the church was rebuilt upon Saxon foundations. It is not unusual, as already stated, to find Saxon quoins still existing at the angles of naves to which aisles have subsequently been added. Evidences, on the other hand, of the westward lengthening of a Saxon nave in the Norman period appear to be rare. At North Witham in south Lincolnshire, the south and (blocked) north doorways are Norman work, in the usual position near the west end of the nave. East of them, however, in the centre of the nave walls, there are distinct traces of the inner openings of a north and south doorway, which may belong to the late Saxon period. That we have here a case of the twelfth century lengthening of an earlier nave may be inferred. The probability is increased by the fact that, in the neighbouring church of Colsterworth, where aisles were added during the early Norman period to a late Saxon fabric, the nave and aisles, towards the end of the twelfth century, were certainly extended a bay westward. As little architectural work is done without a precedent, we may assume that the builders at Colsterworth were following the example of North Witham.