walling, the masons were directed to use stone of finer texture and
smaller grain. It has been thought by some that this material was
brought from Caen in Normandy. The same stone was used to re-face
parts of the nave piers. And in addition Purbeck marble was selected
instead of that which was to be found in Sussex.

It is interesting to remember that the new choir of Canterbury had
only been finished about three years before the fire occurred at
Chichester. This work had been begun by William of Sens and finished
by William the Englishman; and though it was so large an undertaking,
it appears to have been commenced and completed between the years 1174
and 1184. This would very naturally exert some influence upon the
building projects of a neighbouring see. Whether any of the actual
craftsmen from Canterbury worked again at Chichester or not we cannot
tell, but it is evident that the Kentish experience was of great help
to Sussex in the new venture. When it had been decided how they should
operate, it was natural that the covering of the building must be the
first provision. This involved the repair of the shattered clerestory,
and then they were free to proceed in other directions. Further than
this we have no means of learning what method was followed in carrying
on the new work; but it continued, so that in about twelve years the
building was dedicated 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