From a Norman drawing inserted in the Great Psalter of Eadwin, in the Library of Trinity College, Cambridge. First published in _Vetusta Monumenta_ (Society of Antiquaries, 1755). For full description and a plan of the waterworks see _Archaeologia Cantiana_, Vol. VII., 1868.] During the four centuries which passed during the construction and reconstruction of the fabric, considerable changes had manifested themselves in the science and art of architecture. Hence it is that Canterbury Cathedral is a history, written in solid stone, of architectural progress, illustrating in itself almost all the various kinds of the style commonly called Pointed. Of these the earliest form of Gothic and Perpendicular chiefly predominate. The shape and arrangement of the building was doubtless largely influenced by the extraordinary number of precious relics which it contained, and which had to be properly displayed and fittingly enshrined. Augustine's church had possessed the bodies of St. Blaize and St. Wilfrid, brought respectively from Rome and from Ripon; of St. Dunstan, St. Alphege, and St. Ouen, as well as the heads of St. Swithin and St. Furseus, and the arm of St. Bartholomew. These were all carefully removed and placed, each in separate altars and chapels, in Lanfranc's new cathedral. Here their number was added to by the acquisition of new relics and sacred treasures as time went on, and finally Canterbury enshrined its chiefest glory, the hallowed body of St. Thomas a Becket, who was martyred within its walls.