fallen besides the one to which attention has already been drawn; and as there appears to be nothing to show that this other was the north-west tower, we must see what evidence there is concerning the central tower. That it was added to we already know. But documentary as well as structural evidence comes to our aid. The first is supplied by the records of Bishop Neville's episcopate; the next by the researches of modern archaeology. Professor Willis has shown in his remarks upon the structure of the piers at the time of the collapse of the mediæval tower and spire in 1861, that these had not been rebuilt at a date later than the twelfth century. But Mr. Sharpe [6], writing to Professor Willis seven years before the occurrence, indicates his discovery--from a close examination of the structure then existing--that before the upper part of the central tower was rebuilt in the thirteenth century the earlier arches at the crossing which were to support it had been taken down, and probably a large part of the piers carrying them. And that, though the twelfth-century voussoirs were re-used others of a fine grained stone were inserted among them to strengthen the arches, or as a substitute for some of the rougher sandstones that could not be used again. By this means, then, the original form and detail of the twelfth-century arches was preserved, so that the drawings representing the measured studies of the building, which were Sir Gilbert Scott's principal authority upon which to base his restoration of this portion of the tower, were made from work which had already been once rebuilt. But why was this part of the church rebuilt, and by whom? Two alternative suggestions for the reason have been offered. [5] Walcott, p. 15. [6] Author of "Architectural Parallels." Evidently, if the upper part of the tower did not fall, it is apparently certain that it was reconstructed, in order to carry the additional weight of the larger tower. But in examining the documentary evidence offered us, we find some further help. The teaching of archaeology shows that the portion of this tower above the main supporting arches and up to the bottom of the parapet was executed between 1225 and 1325--that is, it was finished not very long after the new part of the south-west tower was completed.