No _stationarius_ was at liberty to dispose of a work placed in his hands for sale (unless it belonged to a foreigner) until it had been exposed in his shop for at least six days, and had at least been three times offered for sale publicly in the auditorium. This offering for sale was cared for by the _banquerii_, who were the assistants or tenants of the rectors. These _banquerii_ were also authorised to carry on the business of the loaning of _pecias_ under the same conditions as those that controlled the _stationarii_. They were also at liberty, after the close of the term lectures, to sell their own supplies of manuscripts (usually of course the copies of the official texts) at public auction in the auditorium. It is difficult to understand how, with a trade, of necessity, limited in extent, and the possible profits of which were so closely restricted by regulations, there could have been a living profit sufficient to tempt educated dealers to take up the work of the _stationarii_ or _librarii_. It is probably the case, as Kirchhoff, Savigny, and others point out, that the actual results of the trade cannot be ascertained with certainty from the texts of the regulations, and that there were various ways in which, in spite of these regulations, larger returns could be secured for the work of the scholarly and enterprising _librarii_. An ordinance issued in 1411 makes reference to booksellers buying and selling books both in French or in Latin and gives privilege to licensed booksellers to do such buying and selling at their pleasure. This seems to have been an attempt to widen the range of the book-trade, while reference to books in the vernacular indicates an increasing demand for literature outside of the circles of instructors and students. In the beginning of the fifteenth century, there was, among a number of the nobles of families in France, a certain increase in the interest of literature and in the taste for collecting elaborate, ornamented, and costly manuscripts. The princely Houses of Burgundy and of Orleans are to be noted in this connection, and particularly in Burgundy, the influence of the ducal family was of wide importance in furthering the development of the trade in manuscripts and the production of literature.