Another statute relates to a "chest of four keys," from which it appears that books were kept in coffers and lent upon indenture or security, exactly as was done in the case of money. It was also a by no means infrequent occurrence for persons to give or bequeath books on condition that they were chained in the chancel of the church for the use of scholars and periodically inspected by the chancellor and proctors. By far the greatest benefactor of the University in the matter of books was Humphrey, Duke of Gloucester, who made many valuable presents during his lifetime, and on his death, in 1447, a final large instalment was added to the store. Of these only one remains in the Bodleian Library, but in contemporary letters there are many notes expressing gratitude for, and appreciation of, this splendid munificence, which advanced the cause of learning more perhaps than any other donation recorded in the annals of the University. The well-being of the librarian was, very properly, a subject of concern. By an ordinance of 1412 his stipend was raised, and he became recognized as one of the chief officers of the University. Lest "hope deferred" should produce slackness in the performance of his duties, the proctors were bound to pay his salary regularly, and, as a further encouragement, every beneficed graduate, on his inception, was required to make him a present of clothes. A similar custom prevailed with regard to the bedels, and it is sententiously remarked that it would be absurd for one adorned with superior dignity to be endued with inferior privileges. The ordinance of 1412 brought about other changes. At the outset the library was accessible to all scholars at stated times; permission was now confined to graduates or religious, and, in the case of the latter, to those who were of eight years' standing _in philosophia_. Thus a monk named Hardwyke, who did not possess this qualification, had to sue for a "grace," and even then the privilege was limited to one term. The reasons for these restrictions probably were that the undergraduate constituency in those days was composed, in a great degree, of careless and dirty boys, who would be apt to soil the manuscripts, while the monks had their own libraries, to which they could resort without encroaching on the slender resources of masters and bachelors. All graduates on admission were required to take a solemn oath that they would handle the books _modo honesto et pacifico, nulli librorum per turpitudinem aut rasuras abolitionesque foliorum, praejudicium inferendo_.