κ, and with much linking of letters, and another (frequent in accounts), which shows, at least in essence, most of the forms of the later minuscule. (cf. below.) This is often upright, though a slope to the right is quite common, and sometimes, especially in one or two documents of the early Arab period, it has an almost calligraphic effect. In the Byzantine period, the book-hand, which in earlier times had more than once approximated to the contemporary cursive, diverged widely from it. Vellum and paper manuscripts The change from papyrus to vellum involved no such modification in the forms of letters as followed that from metal to papyrus. The justification for considering the two materials separately is that after the general adoption of vellum, the Egyptian evidence is first supplemented and later superseded by that of manuscripts from elsewhere, and that during this period the hand most used was one not previously employed for literary purposes. Uncial hand The prevailing type of book-hand during what in papyrology is called the Byzantine period, that is, roughly from AD 300 to 650, is known as the biblical hand. It went back to at least the end of the 2nd century and had had originally no special connection with Christian literature. In manuscripts, whether vellum or paper, of the 4th century found in Egypt are met other forms of script, particularly a sloping, rather inelegant hand derived from the literary hand of the 3rd century, which persisted to at least the 5th century; but the three great early codices of the Bible are all written in uncials of the biblical type. In the Vaticanus, placed in the 4th century, the characteristics of the hand are least strongly marked; the letters have the forms characteristic of the type but without the heavy appearance of later manuscripts, and the general impression is one of greater roundness. In the Sinaiticus, which is not much later, the letters are larger and more heavily made; and in the Alexandrinus (5th century) a later development is seen, with emphatic distinction of thick and thin strokes. By the 6th century, alike in vellum and in papyrus manuscripts, the heaviness had become very marked, though the hand still retained, in its best examples, a handsome appearance; but after this it steadily deteriorated, becoming ever more mechanical and artificial. The thick strokes grew heavier; the cross strokes of T and Θ