The roof of the nave was greatly damaged at the time of the Civil Wars--indeed, it has been said that the central spire, in its fall, completely smashed it in; but this is probably not the case, as the spire almost certainly fell on the other side of the tower. Still, it is not difficult, after reading an account of the siege, to understand that the roof would be much injured. About a century after its repair by Bishop Hacket, it was found that the great weight of the stone groining was forcing out the clerestory walls, already much weakened by rough usage, and, in consequence, Wyatt removed the stone work in several bays, and replaced it with lath and plaster work made to imitate the rest of the roofing. Sir Gilbert Scott was urged to restore the old stone vaulting, but he decided that without great structural alterations, principally to the buttresses, which he did not feel justified in making, this could not be done. The vaulting has been coloured so that the difference between the stone compartments--the most eastern and the two western ones--and the plaster compartments might not be noticed; it will easily be seen how much the clerestory walls have been thrust out. It is also interesting to note that at about the same time Wyatt restored the roof of the aisles to its old pitch. Originally, as now, the aisle roof ascended so as to reach to just below the clerestory windows. In Hollar's picture the upper portion of the triforium windows can be seen, so that they must have become practically a portion of the clerestory during this time. Investigation of the windows themselves proves that they have been glazed, and this confirms what otherwise, considering the great inexactness of the pictures of the period, could not be inferred with certainty. There is a view of the cathedral as late as 1781 showing this arrangement; but in Jackson's "History of Lichfield," 1796, the aisle roof hides the whole of the triforium as at present. The windows of the aisles agree well with the other windows of the nave, and have three lights with trefoiled circles in the head, while below the windows is an arcade resting on a bench, the arches of which are surmounted with pediments richly carved. There are six of these arches in each bay, and between the bays rise triple vaulting shafts with carved capitals of leafage; from these spring three ribs running to a central rib on which are beautiful bosses like those in the nave. [Illustration: THE NAVE, LOOKING WEST.]