It is evident that the Library had suffered considerably from the negligence of those in whose charge it had been. Many volumes were missing, and those that remained were in bad condition. Platina and his master set to work energetically to remedy these defects. The former engaged a binder, and bought materials for his use[369]; the latter issued a Bull (30 June) of exceptional severity[370]. After stating that "certain ecclesiastical and secular persons, having no fear of God before their eyes, have taken sundry volumes in theology and other faculties from the library, which volumes they still presume rashly and maliciously to hide and secretly to detain"; such persons are warned to return the books in question within forty days. If they disobey they are _ipso facto_ excommunicated. If they are clerics they shall be incapable of holding livings, and if laymen, of holding any office. Those who have knowledge of such persons are to inform against them. The effect produced by this document has not been recorded; nor are we told what the extent of the loss was. It could hardly have been very extensive, for a catalogue which Platina prepared, or perhaps only signed, on the day of his election, enumerates 2527 volumes, of which 770 were Greek and 1757 Latin[371]. The number of the latter had more than doubled in the twenty years that had elapsed since the death of Nicholas V., an augmentation due, in all probability, to the activity of Sixtus himself. The place selected to contain this extensive collection was the ground-floor of a building which had been erected by Nicholas V. and subsequently used as a provision store. The position of it, and its relations to neighbouring structures, will be understood from the accompanying plan (fig. 97), which I borrow from M. Fabre's paper. In order to shew how the building was arranged when it was first built, before other structures abutted against it, I have prepared a second plan (fig. 98) drawn from measurements taken by myself. [Illustration: Fig. 97. Ground-plan of part of the Vatican Palace, shewing the building of Nicholas V., as arranged for library purposes by Sixtus IV., and its relation to the surrounding structures. From Letarouilly, _Le Vatican_, fol. Paris, 1882; as reproduced by M. Fabre.]