Schœffer continued to print during the whole of the fifteenth century, though towards the end he issued few books, Another printer, Petrus de Friedberg, started to print at Mainz in 1493, and between that time and 1498 issued a fair number of books. About 1480 a group of six or seven books, all undated, were printed at Mainz, which were long supposed to be very early, and not impossibly printed by Gutenberg. One of these was a _Prognostication_, said to be for the year 1460, and therefore presumably printed in 1459. A copy is preserved in the library of Darmstadt; and some years ago this was examined by Mr. Hessels, who found that the date had been tampered with, and that it should really read 1482. From 1455 onwards, while the press of Schœffer was busily at work, we lose sight of Gutenberg. Three books, however, all printed about 1460 at Mainz, are ascribed to him. These are the _Catholicon_ (a kind of dictionary) of 1460, the _Tractatus racionis et conscientiæ_ of Matthæus de Cracovia, and the _Summa de articulis fidei_ of Aquinas, both without date. To these may be added a broadside indulgence printed in 1461. Bernard attributes these books to the press of Henry Bechtermuntze, who afterwards printed with the same type at Eltvil. One fact appears to tell strongly against this conclusion. In 1469-70, when Schœffer issued his catalogue, we find these three books in it, the remainder being all of Schœffer’s own production. How did they get into Schœffer’s hands? Had they been printed by Bechtermuntze we should surely find the _Vocabularius ex quo_ also in the catalogue, for he had issued editions in 1467 and 1469. It is more probable that they had formed the stock of a printer who had given up business, and had therefore got rid of all the books remaining on his hands.[10] [10] In 1468 all the materials connected with Gutenberg’s press were handed over to Conrad Homery, their owner, who binds himself to use the type only in Mainz; and also binds himself, if he sells it, to sell it to a citizen of Mainz, _provided that citizen offers as much as a stranger_. The stock of printed books would also belong to Homery in his capacity of creditor, and would be sold in Mainz, where, so far as we know, there was no one except Schœffer to buy them. In the copy of the _Tractatus racionis_ belonging to the Bibliothèque Nationale the following manuscript note occurs: ‘Hos duos sexternos accomidauit mihi henrycus Keppfer de moguncia nunquam reuenit ut reacciperetur,’ etc. This Keppfer was one of Gutenberg’s workmen; and his name occurs in the notarial instrument of 1455, so that this inscription forms a link between the book and Gutenberg.