Sec. 23. We have seen, however, that, even in the earliest days, there was a tendency to admit additions to the simple longitudinal plan, which, in process of time, were bound to give birth, if not to a definitely centralised plan, to something, at any rate, in which a central point counted for much. A feature of the early cathedral and of St Pancras at Canterbury, was the projection of _porticus_, porches or side chapels, from the nave. These were entered by archways pierced in the centre of the lateral walls. In the cathedral they had outer doorways, and formed the main entrances of the church, on the north from the monastery, on the south from the city. The south porch contained the altar of St Gregory, and, as Eadmer tells us, was used as a court of justice to which litigants, in process of time, resorted from every part of England. In the north porch, dedicated to St Martin, was held the school of the monastery. Upon both porches towers were built at a date which cannot be ascertained, but was probably later than the time of Augustine. Of the use of the porches at St Pancras, which did not contain outer doorways, it is impossible to say anything definitely. Entrance porches, of which one remains, projected from the sides of the church at Bradford-on-Avon: the outer and inner doorways of the north porch are extremely narrow, and are placed west of the centre of its north and south walls. It is possible, therefore, that there was an altar in this porch, so that it served the double purpose of entrance porch and side chapel. Sec. 24. As time went on, the western porch beneath the tower was disused as a public entrance. The principal entrance of most churches is on the south side, west of the centre of the aisle wall, and is usually covered by a porch. There is a Saxon example of this at Bishopstone in Sussex, where, as at Bradford, room seems to have been left for an altar on the east side. However, the main entrance of the ordinary Saxon church was at the west end, through the ground floor of the tower. The porch in the lateral wall seems to have been regarded primarily as a side chapel; and in some later Saxon churches the porches were dissociated from lateral doorways, and were planned as closed projections from the eastern part of the north and south walls of the nave. This seems to have happened at Britford, near Salisbury, where archways remain on both sides near the east end of the nave. At Deerhurst square projections were entered from both sides of the nave, immediately west of the chancel arch; and it is probable that there were somewhat similar projections at Repton. At Worth in Sussex, where the north and south doorways of the nave are Saxon, and there is no western entrance or original tower, there are large Saxon chapels projecting from the eastern part of the nave, and entered by wide arches. The cruciform plan is sufficiently marked in the conjectural restorations of Deerhurst and Repton. At Worth it is quite unmistakable.