As a general rule, these libraries were divided into the lending library and the library of reference. These two parts of the collection have different names given to them. In the Vatican Library of Sixtus IV. we find the common library (_Bibliotheca communis_) or public library (_B. publica_), and the reserved library (_B. secreta_). The same terms were used at Assisi. At Santa Maria Novella, Florence, there was the library, and the lesser library (_B. minor_). In the University Library, Cambridge, there was "the public library" which contained the more ordinary books and was open to everybody, and "the private library" where the more valuable books were kept and to which only a few privileged persons were admitted[424]. At Queens' College, in the same university, the books which might be lent (_libri distribuendi_) were kept in a separate room from those which were chained to the shelves (_libri concatenati_), and at King's College there was a public library (_B. magna_) and a lesser library (_B. minor_). In short, in every large collection some such division was made, either structural, or by means of a separate catalogue[425]. I have shewn that two systems of bookcases, which I have called lectern-system and stall-system, were used in these libraries; but, as both these have been copiously illustrated, I need say no more on that part of the subject. Elaborate catalogues, of which I have given a few specimens, enabled readers to find what they wanted in the shortest possible time, and globes, maps, and astronomical instruments provided them with further assistance in their studies. Moreover in some places the library served the purpose of a museum, and curiosities of various kinds were stored up in it. No picture of a medieval library can be complete unless it be remembered that in many cases beauty was no less an object than utility. The bookcases were fine specimens of carpentry-work, carved and decorated; the pavement was of encaustic tiles worked in patterns; the walls were decorated with plaster-work in relief; the windows were filled with stained glass; and the roof-timbers were ornamented with the coat-armour of benefactors.