To these eight books must be added the _De octo partium orationis constructione libellus_ of Lily and Erasmus, two leaves of which were found in the book bound by Siberch which Mr Duff discovered at Westminster. This _libellus_, originally written by William Lily and revised, at Colet's suggestion, by Erasmus, was a popular school book of the period. It was in the binding of the same book that the letter from Petrus Kaetz, a Dutch printer, was also found. This letter has many points of interest. Kaetz sends Siberch "25 prognostications and 3 New Testaments small," as well as a parcel to be delivered to Niclas [Speryng] and we may fittingly conclude our notice of Siberch with the tribute of a contemporary to his prospects as a printer: Know, Jan Siborch (writes Petrus Kaetz) that I have received your letter as [well as specimens] of your type, and it is very good; if you can otherwise ... and conduct yourself well, then you will get enough to print. (Translation by Dr Hessels, Jenkinson, _C.A.S._ VIII, 186.) [Illustration: TRADE-MARK OF JOHN SIBERCH] II THE CHARTER--THOMAS THOMAS AND THE STATIONERS Though it may not be clear to what extent John Siberch was officially recognised as printer to the university, it is evident that no successor to him was immediately appointed. University stationers and bookbinders, however, had been for some time established in a privileged position. As early as 1276 we find a reference to the "writers, illuminators, and stationers, who serve the scholars only," and in a note on this phrase Fuller defines the _stationarii_ as "publicly avouching the sale of staple-books in standing shops (whence they have their names) as opposite to such circumforanean pedlers (ancestors to our modern Mercuries and hawkers) which secretly vend prohibited books." In 1350 John Hardy, procurator of the Corpus Christi Gild, is described as "stationarius of the University" and we learn something of the stationers' duties from the prohibition by Convocation in 1408 of the use in schools of "any book or tract compiled by John Wiclif, or any one else in his time or since or to be compiled thereafter" unless first examined by the universities and afterwards approved by the Archbishop. After the book had been finally sanctioned, it was to be delivered "in the name and by the authority of the University to the stationers to be copied; and a faithful collation being made, the original should be deposited in the chest of either University, there to remain for ever." In his edition of _Grace Book A_ (1454-88) Sir Stanley Leathes summarises the position of the _Stationaries_ as follows: