In 1477 (14 April) "John the chain-maker (_Joannes fabricator catenarum_)" supplies "48 iron rods on which the books are strung on the seats[390]" and also 48 locks, evidently connected with the same number of rods supplied before. In the same year a key-maker (_magister clavium_) supplies 22 locks for the seats and cupboards in the _Bibliotheca secreta_[391]; and in 1480, when the _Bibliotheca pontficia_ was being fitted up, keys, locks, chains, and other ironwork were supplied by Bernardino, nephew of John of Milan[392]. For further information we must turn to the catalogues. For my present purpose the first of these[393] is that by Platina, of which I have already spoken, dated 14 September, 1481. It is a small folio volume, written on vellum, with gilt edges, and in plain binding that may be original. The first page has a lovely border of an enlaced pattern with the arms of Sixtus IV. in a circle at the bottom. The compiler of the catalogue goes through the library case by case, noting (at least in the Latin Library) the position of the case, the subjects of the books contained in it, and their titles. This is succeeded by an enumeration of the number of volumes, so as to shew, in a couple of pages, how many the whole Library contained. MM. Muentz and Fabre print this enumeration, but, so far as I know, the catalogue itself has not as yet been printed by any one. For my present purpose I shall combine the headings of the catalogue, the subjects, and the number of the volumes, as follows: Inventarium Bibliothecae Palatinae Divi Sexti Quarti Pont. Max. [I. LATIN LIBRARY.] Ad sinistram ingredientibus In primo banco. [_Bibles and Commentaries_] 51 In secundo banco. _Hieronymus. Augustinus_ 55 In tertio banco. _Augustinus. Ambrosius. Gregorius_ 47 In quarto banco. _Ioannes Chrysostomus_ 50 In quinto banco. _Thomas_ 47 In sexto banco. _In Theologia. In divino officio_ 54 In septimo banco. _Ius canonicum_ 43 In octauo banco. _Ius canonicum_ 41 In nono banco. _Ius civile_ 42 ----430 In primo banco ad dextram ingredientibus. _Philosophi_ 53 In secundo banco. _Astrologi. In Medicina_ 48 In tertio banco. _Poetae_ 41 In quarto banco. _Oratores_ 43 In quinto banco. _Historici_ 33 In sexto banco. _Historici ecclesiastici_ 48 In septimo banco. _Grammatici_ 47 ----313 [II. GREEK LIBRARY.]