salutis millesimo quadringentesimo octogesimo quinto kalendas Iunij” is very easily read as 1485. It is, of course, equally easy to make the opposite mistake and transfer to the record of the month a number which relates to the year. As a rule, the printers, by interposing “die” or “vero” or both, or by a change of type, put their meaning beyond dispute; but sometimes they got confused themselves, and by leaving out either the last numeral of the year, or that of the day of the month, produced a puzzle which can be solved only by independent knowledge of the years during which a printer worked. FOOTNOTES [1] We follow Mr. Clark’s rendering, but think that, in spite of Priscian, the writer must have intended by “_nullum se putat habere laborem_,” “thinks all that mighty easy.” [2] Adinuentionibus. The preposition was probably here intended to be pressed, giving the meaning of “additional inventions” or improvements. But as it may have been suggested by the “adinuentione” of the Psalter of 1457, I keep the same translation. [3] I make this emendation with much misgiving, as the medieval use of “quisque” was very elastic, and the text may be right. [4] As regards the misprint MCCCCLXI for MCCCCLXXI, the ease with which a compositor could omit a second X is evident of itself; but it may be worth while, as proof of the frequency with which this particular error actually occurred, to quote here four several colophons from a single year, 1478, in all of which it occurs. These are: (i) At Barcelona, in an edition of the “Pro condendis orationibus iuxta grammaticas leges” of Bartollommeo Mates: COLOPHON: Libellus pro efficiendis orationibus, ut grammaticae artis leges expostulant, a docto uiro Bertolomeo Mates conditus et per P. Iohannem Matoses Christi ministerum presbiterumque castigatus et emendatus sub impensis Guillermi Ros et mira arte impressa per Iohannem Gherlinc alamanum finitur barcynone nonis octobriis anni a natiuitate Cristi MCCCCLXVIII. A booklet for making speeches as the rules of the art of grammar demand, composed by a learned man, Bartolommeo Mates, and corrected and amended by Father Juan Matoses, a minister and priest of Christ, at the expense of Guillermo Ros, and printed with wonderful art by Johann Gherlinc, a German, is ended at Barcelona on October 7th, in the year from Christ’s birth MCCCCLXVIII. (ii) At Oxford, in the edition of the Exposition on the Creed written by Rufinus of Aquileia and attributed to S. Jerome: COLOPHON: Explicit exposicio sancti Ieronimi in simbolo apostolorum ad papam laurencium Impressa Oxonie et finita Anno domini M.CCCC.LXVIII, xvii die decembris. Here ends the Exposition of St. Jerome on the Apostles’ Creed addressed to Pope Laurence. Printed at Oxford and finished A.D. M.CCCC.LXVIII, on the 17th day of December.