Upon this follow four Latin verses in honour of the Holy Trinity and the Virgin Mary and the words "Deo Gracias." We can imagine an inventor who, despite his invention, remained profoundly unsuccessful, writing the opening words of this colophon, and it is not easy to see their appropriateness to any one else. It is thus highly probable that Gutenberg set up this book and refused to follow Fust and Schoeffer in their advertising ways. He may even have had a special reason for this, for among the forty-one copies registered (almost all in great libraries) two groups may be distinguished, one embracing the copies on vellum and the majority of the paper copies, the other the rest of the paper copies. The groups are distinguished by various differences, of which the most important is that in the one case the workmen used four and in the other two pins to keep the paper in its place while being printed. An attractive explanation of all this would be that while Gutenberg set up the book and was allowed to print for himself a certain number of copies, there was a richer partner in the enterprise whose pressmen pulled the greater part of the edition. But Dr. Zedler, who has brought together all the available information about the book in his monograph _Das Mainzer Catholicon_, has a different explanation. In the same type as the _Catholicon_ are two small tracts of little interest, the _Summa de articulis fidei_ of Thomas Aquinas, and the _Dialogus_ of Matthaeus de Cracovia; also an Indulgence of Pope Pius II. In 1467 the type is found in the hands of Heinrich Bechtermunze at Eltvil, who died while printing a vocabulary. This was completed by his brother Nicholas, who also printed three later editions of it. During the years which precede 1457, Johann Fust and Peter Schoeffer, the one a goldsmith, the other a clerk in minor orders of the diocese of Mainz, are involved in the obscurity and uncertainty which surround Gutenberg's career. Reasons have been offered for believing that it was Schoeffer who designed the small neat types used in the Mainz Indulgences of 1454-5, and that he with his skill and Fust with his money pushed the Forty-two Line Bible to a successful completion. If they printed this, they no doubt printed also a liturgical psalter in the same type, of which a fragment is preserved at the Bibliotheque Nationale at Paris. But we do not touch firm ground until we come to the famous Psalter of 1457, the colophon of which leaves us in no doubt as to its typographical authorship. This runs: Presens psalmorum[23] codex venustate capitalium decoratus Rubricationibusque sufficienter distinctus Adinuentione artificiosa imprimendi ac caracterizandi absque calami ulla exaracione sic effigiatus, Et ad eusebiam dei industrie est consummatus, Per Iohannem fust ciuem maguntinum, Et Petrum Schoffer de Gernszheim Anno domini Millesimo .cccc.lvij. In vigilia Assumpcionis.