One of the arguments used in favour of the theory that the manuscript was written in Egypt is the sporadic occurrence in it, both in the text itself and in the earlier corrections, of an omega of very curious shape. (⟒ as against the usual w). This very rare form is found in one or two papyri from Egypt, notably in Papyrus 28 of the John Rylands Library, Manchester, but, apart from a few instances in the Codex Vaticanus, it appears to be unknown elsewhere. Now in 1839-40, the Codex Vaticanus was locked away and inaccessible to scholars in the Vatican Library, and the papyri in question were buried in the sands of Egypt. Whence then could Simonides have obtained it? Or what object could he have in inventing so strange a form?