It is, I think, obvious that there must have been some sort of vestibule just inside the door of entrance, where students could be received, and where they could consult the catalogue or the Librarian. Further, the catalogues shew that the seven desks arranged in this part of the Library were in all probability shorter than those of the opposite side, for they contained fewer volumes. If we allow each of them 21 ft. 4 in. in length, we shall dispose of 149 ft., which leaves 224 ft. for the 8 desks of the Greek Library, or 28 ft. for each, with one foot over. _Greek Library._ In this room there were eight seats, and, as explained above, each was about 28 ft. long. The room being 28 ft. wide, this number, with a width of 3 ft. for each, is very convenient, and leaves a passage 4 ft. wide along the west wall. The length, moreover, does not interfere with the passage from door to door, and leaves a short interval between the ends of the desks and the opposite wall. _Inner Library._ In this room space has to be provided for (1) six seats, each holding on an average about 30 volumes; (2) a press (_armarium_) with five divisions, and holding 938 volumes; (3) a settle (_spalera_); (4) 12 chests or coffers (_capsae_). I have placed the _armarium_ at the end of the room, opposite the window. In this position it can be allowed to be 20 ft. in width with 5 divisions, each, we will suppose, about 4 ft. wide. Let us suppose further that it was 7 ft. high, and had 6 shelves. If we allow 8 volumes to each foot, each shelf would hold 32 volumes, and each division six times that number, or 192. This estimate for each division will give a total of 960 volumes for the five divisions, a number slightly in excess of that mentioned in Platina's catalogue.