The book here referred to is the celebrated _Exposicio sancti Jeronimi in simbolum apostolorum_, written by Tyrannius Rufinus of Aquileia; and in the colophon it is clearly stated that the book was printed in 1468. ‘Impressa Oxonie et finita anno domini.M. cccc. lxviij xvij. die decembris.’ Many writers have argued for and against the authenticity of the date; and though some are still found who believe in its correctness, it is generally allowed to be a misprint for 1478. In the first place, the book has printed signatures, which have not been found in any book before 1472. Again, copies of this book have been found bound up in the original binding with books of 1478, In the library of All Souls College, Oxford, is a copy bound up with one of the 1479 books, and though the present binding is modern, they were originally bound together; and we find a set-off from the damp ink of the second volume on the last leaf of the first. A copy in another Oxford library, bound up with the 1479 books, has been marked for or by the binder with consecutive signatures all through the several tracts. Instances of misprinted dates are far from rare. The _Mataratius de componendis versibus_, printed at Venice by Ratdolt, is dated 1468 instead of 1478, and was on that account sometimes put forward as a proof of early printing there. Spain, too, claimed printing for the same year on account of a misprinted ‘1468’ in a grammar printed at Barcelona. A _Vocabularius rerum_, printed by John Keller at Augsburg, has the same misprint of 1468. However, the surest test of the date of a book is to place it alongside others from the same press, and compare the workmanship. In this case the book falls naturally into its place at the head of the Oxford list in 1478, taking just the small precedence of the two books of 1479, which the slightly lesser excellence of its workmanship warrants. A break of eleven years between two books which are in every way so closely allied would be almost impossible, and quite unsupported by other instances. Accepting 1478 as the correct date, it is clear that Oxford lost no time in employing the new art, for Caxton had only commenced at Westminster the year before. The first three books, the _Exposicio_ of 1478 before mentioned, and the _Ægidius de originali peccato_, and _Textus ethicorum Aristotelis per Leonardum Aretinum translatus_, both of 1470, form a group of themselves. They are printed in a type either brought from Cologne or directly copied from Cologne work, and strongly resembling that used by Gerard ten Raem de Berka or Guldenschaff. None have a printer’s name, but they are ascribed to Theodore Rood of Cologne, the printer of the other early Oxford books.