Editorial note — INDEX

On the other hand, in the First Epistle to the Corinthians and in the Epistle of James, there are references to mirrors that may have been of glass. Again, in Revelation we find ‘a sea of glass like unto crystal’ (iv. 6), and what is more important, glass in other passages (xxi. 18 and 21) is referred to as ‘pure’ and ‘transparent’ (the words in the original being ὓαλος, καθαρός, and διαφανής). In view of the question, discussed below, of the date when clear glass came into general use, this contrast between the Gospels and the, on the whole, later books is of some interest.