Mr. Davys is of opinion that, "though we read of no further additions being made to the church between the time of Godfrey, (1299), and that of abbot Ashton, much took place in this interval. Almost all the windows of the church must have been transformed from their original character into their present shapes, and those which escaped this mutilation, as in the transepts and clerestory, were filled with their present unsuitable tracery, about the conclusion of the fourteenth century. "The porch, or chapel, now used as the Chapter Library, standing within the central arch of the West Front, was probably built soon after this time. The reason why it was erected will be evident to any one who will examine the front carefully; for it will be seen that the clustered column, between the northern and middle arch, leans out to a very great extent, and were it not for the support it receives from this chapel, very serious consequences must ensue. The whole front also leans to the westward, though not so much so as this column. This inclination is evidently of very early date, and probably took place shortly after the completion of the front. This chapel was therefore added as a support to the front; its insertion is, nevertheless, much to be regretted, as it materially diminishes the beauty of the finest part of the Cathedral. "Many alterations, and additions, seems to have taken place in this abbey, during the time when the decorated style was prevalent in England; and consequently between the time when the Infirmary Church was built, and the last-mentioned structure was erected, at the west end of the church. Of these may be mentioned, the two elegant spires on the north and south towers of the West Front, and the great south-west tower of the church, which has since been materially diminished in height. The present Chapter School, which was originally the chancel of Thomas a Becket's Chapel, was also built at this period; its nave was taken down in the time of Abbot Genge, who presided here between the years 1396 and 1408, and the materials were given to the inhabitants of Peterborough to re-build their parish church with, in a more convenient situation. The eastern and western arches of the lantern must also have been altered into their present shape about this time, and the first story of a tower, which, if it had been completed, would have been one of the finest in England, built upon them: this is now remaining, and forms all the pretence that this Cathedral can show to a central tower."