In 1342, the _librarii_ were permitted to increase their selling commission from four deniers to six deniers in the case of manuscripts sold by them for clients who were not themselves members of the university. Kirchhoff points out, however, that this commission could by no means have represented the actual charges made. The University of Paris claimed the authority to license its _librarii_, and to carry on business not only in Paris but throughout France. _Librarii_ from without were, however, strictly prohibited from carrying on business in Paris. There were in Paris, in addition to the _stationarii_ and _librarii_, a certain number of unlicensed dealers who were not members of the university, and who might be classed as book pedlars. While these book pedlars enjoyed no university privileges, their business was subjected to the supervision of the university authorities. It was the purpose of the regulations to prevent dealers of this kind from taking part in any higher grade book business. They were, for instance, forbidden to sell any volume for a higher price than ten sous, which, of necessity, limited their trade practically to chap-books, broadsides, etc. They were also forbidden to trade in any covered shops, their business being carried on in open booths. In case they were at any time found to be trenching upon the business of the licensed or certified book-dealers (_libraires jurés_), they forfeited promptly their permits as book pedlars. In 1323, the Paris School was the most important in Europe for theological studies, as that of Bologna was the authority on jurisprudence, and that of Padua for medicine; and the trade of the Paris booksellers was, therefore, largely devoted to theological writings. It is partly on this ground that the records of the monasteries in which there was scholarly and literary activity make more frequent reference during this century to Paris as a book centre than to any one of the Italian cities. When, for instance, King Wenzell II. of Bohemia, at the time of the founding of the Cistercian abbey of Königsaal, presented two hundred marks of silver for the organisation of its library, the Abbot Conrad had, he reports, no other course to take than to travel to Paris in order to purchase the books. This was in the year 1327.[363] Johann Gerson, writing in 1395 to Petrus de Alliaco, speaks of the wealth of the literary stores available at this time in Paris. The list that he gives as an example of these treasures is devoted exclusively to theological works. While it is difficult to understand from the evidence available what machinery may have been in existence during the thirteenth and fourteenth centuries for the distribution of the books, there are various references to indicate that such distribution took place promptly over a very considerable territory. The anonymous author of a polemical tract, written in order to point out the errors of some heretical production, says: