again.

There is nothing now to indicate that the provision of a vault had been intended by the original builders of these walls. This deficiency was met by the insertion of vaulting shafts and the addition of external buttressing; for as the pressure of the flat wooden roof was exerted for the most part vertically upon its supports, that of the vault would be a strong lateral thrust as well as vertical pressure, and these were to be provided for. We shall see presently that all the real beauties of this most interesting work were the outcome both of the needs of practical structure and the requirements of ritual and a ceremonial expression of the liturgy.

It is not possible for us to discover exactly when the

several parts of the work undertaken after the fire of 1186-1187 were begun, nor when they were finished. Of dates we have little knowledge, except that of the dedication in 1199, the fall of two towers in 1210, and the various indications of architectural activity at certain periods given by the several dates mentioned in connection with donations, bequests, and royal sanctions in the episcopal statutes and other documents. These nearly all show that the time of greatest activity was

after 1186 and before 1250. If such a feat as has been mentioned was performed at Canterbury between 1174 and 1184, was it not possible also at Chichester? Then it becomes necessary to assume that the structural alterations were continuing during the whole of the period suggested; and this was so. Enough work had been done by 1199 to allow of another dedication of the building. Seffrid II. had been bishop from 1180-1204, and the register of Bishop William Rede, written one hundred and sixty years later, explicitly states that Seffrid "re-edified the Church of Chichester." This is a comprehensive statement, but it might easily include at least the greater part of the vaulting with some form of external roof. Such a change as this involved the alteration of the nave and aisle piers, so that the slight vaulting shafts of finer stone might be inserted in the older masonry. The lower part of each of the piers of the nave arcade on the side towards the centre of the church was re-faced with the same material, and smaller shafts of Purbeck marble were introduced upon the piers, replacing probably the heavy ones of an earlier date. These shafts formed the support to a more delicate moulded member, which was now substituted for the original and very simple outer order of the original arch. A string-course of Purbeck marble was inserted as a line of separation between the nave arcade and the triforium, and also between the triforium and clerestory. The triforium itself remained as it had been before 1186; but the clerestory was dressed again, so that it obtained quite a new character. It was re-faced with the fine-grained stone, and the slight shafts which supported the clerestory arcades were provided with Purbeck capitals and bases. This arcading itself was also changed from its earlier type. The central arch was still made round in form, but those on either side of it were each pointed, and all were more finely moulded than before. Above this point rises the new stone vault, which is carried upon a framework of strong transverse and diagonal ribs. Between these the shell, or filling, which formed the surface of the vault, is of chalk, roughly cut and irregularly laid; above this was placed a thick coat of concrete.

Some flying-buttresses were built now in order to meet the thrust exerted by the new arched vault of the nave. These were constructed in two series, one being concealed

under the sloping roof over the triforium and acting in place of the earlier round-arched abutment. Its supports were provided at the points where the transverse and diagonal arches of the nave vault began to spring away from the vertical plane of the walls. The other series was the immediate counter-poise to any direct thrust exerted by the arching of the vault against the upper section of the same walls. There was, in fact, a large buttress added to support these nave walls at that point from which each set of vault-carrying ribs began to rise. This buttress, though apparently sub-divided, was one thing, but of composite structure. It was pierced first by the aisle, next by the triforium, and then again above the roof of the triforium. It will be seen that most of these alterations were the direct result of the introduction of a stone vault.

But the almost entire renewal of the eastern part of the cathedral was made possible by the destruction and total removal of the apsidal terminations of the earlier work. It has been suggested that the fire may have so badly damaged this portion as to allow no alternative but rebuilding. What may have been the actual cause of its removal it is impossible for us now to know; but the substitute is quite a perfect piece of work of its kind. This ambulatory, or presbytery, as it is commonly misnamed, was nearly all newly built from the foundations during the first half of the thirteenth century. The continuation of the arcade, the triforium, the clerestory, and the vault, the vaulting of the aisles and the chapels forming their terminations eastwards,—all this, with the new arch at the entrance to the earlier lady-chapel, was work of the same date.

Some new buttressing had been added to the south-west tower when the upper part of the tower itself was rebuilt; but the larger works were the addition of a vaulted sacristy in the corner between the west side of the south end of the transept and the nave. On the opposite side of the same part of the transept a square-ended chapel with a vestry attached was added in place of the original shallow apsidal chapel. The original chapel on the east side of the north end of the transept was also removed to make way for another and much larger one. This is now used as the cathedral library.

The scheme planned after the second fire having been completed by about the middle of the thirteenth century, little further work was undertaken in comparison with that then finished; but before 1250 the wall of the south aisle of the nave was pierced in four bays, and two more chapels were added. Then, on the north of the nave, the outer wall of the aisle was cut through in the second bay, going west from the transept, and a small chapel was built. The other chapels west of this one were added during the latter half of the century. In each case the deeply projecting buttresses which had been introduced against the earlier walls after the second fire were used, where they were available, to form parts of the masonry of these new chapels, and were therefore not disturbed unnecessarily. The old walls having been altered, and the earlier buttresses being changed in their nature, it

became necessary to carry the original thrust from the nave still farther out from its source in order to find for it some satisfactory abutment, and in doing this there was that new force, introduced by the vaulting of these added chapels, to be reckoned with in addition. Consequently, to the earlier buttressing more was added. The exact nature and the approximate date of this work are shown by Professor Willis in the sections and