The problem of Roman windows and their furnishings has never been studied seriously in this country as so little evidence is usually forthcoming. Window glass is found in fair quantities on most sites and, where the pieces are large enough to indicate size, they would appear to be no more than g to 12 in. square, but there is little indication of how they were fastened into the window. Such technical details have unfortunately escaped attention in those countries where sufficient remains have been found to attempt reconstruction. While R. Herbig has discussed windows generally: the most detailed treatment has been that by Vittorio Spinazzola in his survey of the excavations of Via dell’ Abbondanza at Pompeii. As he indicates, while houses were only of one story, the window openings tended to be very small slits but, as soon as an upper floor was built, more light could be obtained without sacrificing safety or privacy. Once the advantages of this became apparent, new and larger windows were inserted on the ground floor, architectural ingenuity being displayed in directing the light to particular parts of a room where it was needed. He touches upon the question of the infilling without adding much detail. Some of the smaller windows appear to have been openings in the wall with wooden, sliding shutters on the inside. The larger ones were filled with iron gratings in a form of a simple grille which has been reconstructed as horizontal flat bars, through which round vertical bars passed, a piece of construction which seems to be unnecessarily difficult. A grille, merely of crossbars, has also been found at Herculaneum.