Whether the windows of St. Sophia at Constantinople originally had colour in them or not, is not quite certain. That they were glazed we know, from the description of the church by Paul the Silentiary, an officer of Justinian's court, but his language about them is tantalizingly vague. From his enthusiasm at the effect of the sunlight through them I am inclined to suspect that they were coloured, though he does not definitely say so. Of this glass, which seems to have been fixed in small rectangular openings in a slab of alabaster, nothing, I believe, remains; but similar work--coloured--is to be seen in other mosques, the only difference being that the openings in the slab are formed into patterns and kept very small. (I have already mentioned the necessity, when dealing with _clear_ coloured glass, of keeping the pieces small and contrasting them with plenty of solid dark.) [Sidenote: Mahommedan windows.] This was as far as stained glass in the East ever got. The Mahommedan conquerors seem to have taken the art as they found it, and continued it down without much change almost to modern times. Their religion debarred them from any attempt to represent living forms, so that the art as it stood sufficed for the needs of their architecture. Visitors to Leighton House may see some of these pierced and glazed lattices from Damascus, and very beautiful they are. In them the pieces are not much larger than a penny, and are set in holes cut in plaster slabs, bevelled on the inside, the glass being set at the outer edge of the hole. The glass is not really of very good quality, but treated in this way even thin poor glass looks rich and jewel-like. [Sidenote: Glass in the West.] What course the glazier's art first followed in the West it is impossible to say, for nothing of it remains earlier than the eleventh century, if as early. Nevertheless, in spite of repeated barbarian invasions, it seems never to have quite died out. The Church, the refuge of the arts and civilization in the general debacle, sheltered it, and from being the luxury of the Roman millionaire it became the ornament of the house of God. From time to time we get allusions to glazed windows, but never a description that can throw much light on their construction or design. Enough is said, however, to show that coloured glass was sometimes used. For instance, we read that St. Gregory of Tours placed coloured windows in the Church of St. Martin in that city in the sixth century.