After the persecution by Diocletian a new era began. Constantine proclaimed tolerance, and by and by Christianity became the religion of the empire. The victory of Christianity was a victory of the Bible as well. This finds its expression in the remarkable fact that the first Christian emperor, the immediate successor of those who persecuted the Bible and tried to destroy it, ordered fifty splendid copies of the Bible to be prepared at his expense for the churches of the newly founded capital, Constantinople. Some scholars have thought that one or two of these copies still survive in the famous manuscript discovered by Tischendorf in the Convent of Mount Sinai (Plate III), or in the Codex Vaticanus at Rome. I venture rather to think that both copies belong to the period of Constantine's sons. But the fact that the Bible, after a period of destruction when most of the earlier copies were burned, got a surprising circulation under official direction accounts, I think, for a puzzling feature in the transmission of the text. From the Old Latin and the Old Syriac, as well as from the testimony of the fathers, we can infer that various forms of the Greek text must once have been widely circulated, which have now almost disappeared, whereas most of our present Greek manuscripts give a text evidently based on a late official recension. Looking at Diocletian's attempt to destroy the Bible altogether and at Constantine's official order to provide a large number of manuscripts, we easily understand the situation. The older forms of text had been swept away; now there was room to supply their place with the learned attempts of later scholars from the schools of Origen or Lucian who endeavoured to bring in more critical texts. [Illustration: PLATE III--CODEX SINAITICUS End of St. Mark (15 : 16-16 : 8) and beginning of St. Luke (1 : 1-18); Mark 16 : 9-20 is missing; 15 : 47 is added at the lower margin by a later hand; remark the numbers of Eusebius's sections and canons. The eight columns of the open book recall the roll-system. Reduced one-fifth from the fac-simile edited by Prof. Lake and published by the Clarendon Press (Oxford and London).] Another change is to be mentioned at the same time. The old form of papyrus rolls became obsolete and the parchment book took its place. The use of this latter form seems to originate in the law schools; the codex, or parchment book, is at first the designation of a Roman law-book. But at an early date the Christian church adopted this form as the more convenient one and gave it its circulation. We hardly say too much when we call the Bible the means by which our present form of book came into general use. Even if the Bible had done nothing else for civilisation than to give mankind the shape of its books that would be a great deal (Plate IV).