If this fresco be compared with the earlier work of Melozzo da Forli, it is not difficult to identify four of the persons present in the Library (other than the readers). The central figure is obviously Sixtus IV., and the Cardinal to whom he is speaking is, I think, meant for Giuliano della Rovere, afterwards Julius II. The figure immediately behind the Pope may be intended for Pietro Riario, and the figure behind him is certainly Platina. The others, I take it, are simply attendants. Nor must it be forgotten that, important as this fresco is in connexion with the Library of the Vatican, it is of even greater interest as a contemporary representation of a large fifteenth century library. The arrangement of each room is not quite so simple as might appear at first sight; and, besides the desks, there are other pieces of furniture to be accounted for. We will therefore go through the rooms in order with the ground-plan (fig. 98). On this plan the cases are coloured gray, the readers' seats are indicated by transverse lines, and the intervals are left white. _Latin Library._ The Accounts tell us that there were 10 seats on the left hand of the Latin Library, and that these were longer than the rest, measuring 38 palms each, or about 27 ft. 9 in. English[400]. As the distance from the central pier to the west wall is just 27 ft. 6 in., it is obvious that the cases must have stood north and south--an arrangement which is also convenient for readers, as the light would fall on them from the left hand. For this reason I have placed the first desk against the pier, the reader's seat being westward of it. A difficulty now arises. It is stated in the Accounts that _ten banchi_ are paid for, but all the catalogues mention only _nine_. I suggest that the explanation is to be found in the fact that ten pieces of furniture do occur between the pier and the wall, the first of which is a shelf and desk, and the last a seat only. This arrangement is to be seen at Cesena and in the Medicean Library at Florence. The room being 34 ft. 8 in. wide, space is left for a passage along the south wall to the door (_a_) of the Librarian's room, and also for another along the opposite ends of the desks. For the arrangement of the rest of the Library, the Accounts give a most important piece of information. They tell us that the whole of the seats for the Common Library, i.e. the Latin and Greek Libraries taken together, 25 in number, cost 300 ducats, of which sum the 10 long seats above mentioned absorbed 130 ducats, leaving 170 to pay for the remaining 15. From these data it is not difficult to calculate the cost of each palm, and from that the number of palms that 170 ducats would buy. I make this to be 510 palms, or about 373 feet[401].