The description of Procopius is for us no mere antiquarian record. It is still a guide which may direct us what to look for and how to explain what we see. S. Sophia is unique in the fact of its survival in continued use, and in its preservation from the horrors of "restoration," which have robbed us, all over the civilised world, of the true work of the greatest Christian architects. The Turks, it must be honestly said, deserve the thanks of Europe for their preservation of their greatest work of sacred art. In 1847 Abdul Mejid undertook the reparation of the damage done by time. He employed the Italian architect Fossali, who was probably the first to do any important work at the main part of the building since the time of John VI. Palæologus. The work on the whole was well done; and it is plain that it must have been absolutely necessary. The wonder is that his work was so conservative as it was. It is impossible not to echo the gratitude of the experts that "far from being a ruin, the church is one of the best preserved of so ancient monuments, and in regard to its treatment by the Turks we can only be grateful that S. Sophia has not been situated in the more learned cities of Europe, such as Rome, Aachen, or Oxford, during 'the period of revived interest in ecclesiastical antiquities.'" Evagrius, who may also be regarded as practically a contemporary of the original building, has also left a description which is worth quoting, of this "great and incomparable work, hitherto unparalleled in history, the Church's greatest temple, fair and surpassing, and beyond the power of words to describe."[55] "The nave," he says, "of the temple is a dome, lifted on four arches, and rising to so great a height that from below it is difficult for the observers to reach with their eyes the apex of the hemisphere; while from above none who might get there, howsoever hardy he might be, would for a moment attempt to lean over and cast his eyes to the bottom. And the arches spring clear from the floor up to the covering which forms the roof; and on the right and left columns, wrought of Thessalian stone, are ranged with (_i.e._ are in line with) the piers of the arches and support upper chambers [enclosed] with other similar columns, so enabling them that wish to lean forward and see the rites that are being performed: and it is here that the Empress also when she is present on the festivals assists at the celebration of the mysteries. But the arches to the east and the west are left clear without anything to intercept the marvellous impression of the huge dimensions. And there are colonnades under the upper chambers already mentioned, finishing off the vast structure with small columns and arches." It may be noted here that the figures that Evagrius gives are inaccurate. The church is 250 feet long from east to west, not including the narthex or the apse; and it is 235 feet across. [Illustration: IN THE GALLERY OF S. SOPHIA]