Another method is to use shelf-register sheets, which occupy very little space, a single sheet being used for each class division or subdivision. The sheet is headed, as shown in the subjoined ruling, with the class letter and number, and the books in the section are entered in author-alphabetical order to begin with, afterwards just as books are added (Fig. 81). The narrow columns are reserved for checking the shelves. The date of check is written at the top, and the presence of the book indicated by a tick. In some open access libraries stock is taken of the shelves twice a year by means of these sheets. Missing books are not ticked, but noted in order that further search may be made in the charging system and other records. When they turn up they are ticked off. The sheets are collated periodically, and any books which continue to be unaccounted for are noted and entered in a special book ruled to show author and title, date missing, and having a column for the record of any subsequent facts, such as its finding, replacement, or other means of recovery. <----------------------------------7″----------------------------------> +------+-------+------------------+-++-----+-+-+-+-+-+-+-+-+-+-+-+-----+ | Ac- | | |V|| | | | | | | | | | | | | E | ^ |ces- | | |o||Mar. | | | | | | | | | | | |100·3| | |sion |Author.| Title. |l|| 6, | Dates of Check. | | | | No. | | |s||1900.| | | | | | | | | | | | | | | | | |.|| | | | | | | | | | | | | | | +------+-------+------------------+-++-----+-+-+-+-+-+-+-+-+-+-+-+-----+ | | 5,216|Balfour|Manual of Botany |1|| ✓ | | | | | | | | | | | | | | |15,621|Henfrey| „ „ |1|| ✓ | | | | | | | | | | | | | | | 5,111|Lindley|Elements of Botany|1|| ✓ | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | |9½″ | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | | | | | | || | | | | | | | | | | | | | |