An author’s colophon must often have been omitted by the scribe or printer who was copying his book precisely because a double colophon seemed confusing, and the scribe or printer wished to have his own say. Nicolaus de Auximo in his Supplement to the Summa of Pisanella ingeniously forestalled any such tampering by linking his remarks to his exposition of the word “Zelus,” the last which he had to explain. After quoting from the Psalms the text “Zelus domus tue comedit me,” “The zeal of thy house has eaten me up,” he proceeds: et hic zelus me fratrem Nicolaum de Ausmo, ordinis minorum indignum pro aliquali simpliciorum subsidio ad huius supplementi compilationem quod struente domino nostro Iesu Cristo, excepta tabula capitulorum et abbreuiaturarum et rubricarum expletum est apud nostrum locum prope Mediolanum sancte Marie de Angelis nuncupatum, et uulgariter Sancti Angeli, M.cccc.xliiii, nouembris xxviii, die Sabbati ante aduentum, hora quasi sexta. Et omnia quae in eo ac ceteris opusculis per me compilatis compilandisue incaute seu minus perite posita continentur peritiorum et praesertim sacrosancte ecclesie submitto correctioni, et cetera. And this zeal hath urged me, Nicholas of Osimo, an unworthy brother of the order of Friars Minor, to the compilation, for some aid of more simple men, of this Supplement, which by the power of our Lord Jesus Christ, save for the table of chapters and abbreviations and rubrics, has been completed at our abode near Milan, called Saint Mary of the Angels, and vulgarly Sant Angelo, in 1444, on November 28, the Saturday before Advent, at about the sixth hour. And both in it and in the other works which either have been or are to be compiled by me, all things which are found stated incautiously or unskilfully I submit to the correction of the better skilled and especially of the Holy Church, etc. The submission of a book, more particularly a theological one, to the correction of the learned and the church was of course “common form” while the Roman dominion was undisputed, and many colophons containing such phrases could be collected. We must pass on now, however, from authors to editors, taking William Caxton, by the way, as an editor and translator who put so much of himself into his work that he deserves honorary rank among authors. That he was his own printer and publisher as well has certainly rather hindered the appreciation of his literary merits, but gives to his colophons, prologues, and epilogues a special flavor of their own. As to which of these opportunities of talking to his readers he should use, Caxton seems to have cared little; but even if we confine ourselves fairly strictly to colophons properly so called, there is no difficulty in finding interesting examples, as, for instance, this from his “Godefroy of Boloyne”: