The _libraires jurés_ comprised two classes, the _libraires grands_ (_officium magni librariatus_), and the _libraires petits_ (_officium parvi librariatus_).[286] The immediate responsibility for the government of the body rested with the four chief _libraires_ (_les quatre grands libraires_). It was they who fixed the prices for the sale or hire of manuscripts, and who supervised the examination of manuscripts with reference, first, as to their admission into the official list of the university texts, and, secondly, as to the completeness and accuracy of the particular parchment submitted. They also inspected the book-shops and the workrooms of the copyists, and verified from time to time the accuracy and the quality of the copies prepared from these accepted texts; they passed upon the qualifications of applicants for the position of _libraire juré_; and, finally, they exercised a general supervision over the enforcement of all the university regulations affecting the book-trade, and gave special attention to those prohibiting any interference with this trade by an outside dealer, one who was not a _libraire juré_. These four chief _libraires_ were each under a bond or “caution” for the amount of 200 livres. In addition to the exemption from general taxes and guard duty conceded to all the _libraires jurés_, these four enjoyed from time to time certain special privileges. In October, 1418, by a regulation of Charles VI., the four chief _libraires_ are exempted by name from certain special duties on wine, etc., which had been imposed for the purpose of securing funds _pour la recouvrance de nos Villes et Chastel de Monstreau ou Faut-Yonne_.[287] It was also necessary for him to find two responsible bondsmen for an amount of not less than 100 livres each.[288][289] In Bologna in 1400 the bond was also fixed at 200 livres, the equivalent of 5065 francs.[290] The special obligations imposed upon and accepted by the _librarii_ and _stationarii_, as specified in documents between the years 1250 and 1350, can be summarised as follows: I. To accept faithfully and loyally all the regulations of the university concerning the production and the sale of books. II. Not to make within the term of one month any agreement, real or nominal, transferring to themselves the ownership of books which had been placed in their hands for sale. III. Not to permit the loss or disappearance of any book so consigned for the purpose later of acquiring ownership of the same. IV. To declare conscientiously and exactly the just and proper price of each book offered for sale, and to specify such price, together with the name of the owner, in some conspicuous place in the work itself. V. To make no disposition of a consigned book without having in the first place informed the owner or his representative of the price to be secured for the same, and to make immediate report and accounting of such price when received.