[7] This illustration is retained because it illustrates a satisfactory method of guiding; but this type of tray is inferior to a special drawer in an “administrative” card cabinet. In such a cabinet drawers would be assigned to (1) “SUGGESTIONS,” which would include the slips for all books noted by the librarian for consideration; suggestions by experts; by staff; incomplete works, etc.; (2) “COMMITTEE DRAWER,” containing books “Submitted to the Committee,” and “Passed,” and “Rejected” (with reasons), or “Postponed for further inquiries, etc.”; (3) “ORDER DRAWER,” with guides showing “Ordered,” “Overdue,” “Not Supplied” (when O.P., Binding, Reprinting, etc., the reasons should be stated and dated); and (4) “ADDITIONS,” containing the slips of books added during the year, after the slips have been used in the cataloguing processes. After a year the slips are worked into the Staff Catalogue. =214.= When the order has been placed with the bookseller, the slips aforesaid should be transferred to a compartment marked “Books on order,” and as the books are supplied they can be withdrawn and placed in a compartment marked “Books for catalogue.” This will leave a residue of overdue books, which can be overhauled at intervals, and, when the books have been written for, transferred to a compartment marked “Books overdue.” A simple form of tray is one divided by means of projecting guides to indicate the contents of each compartment (Fig. 61). This plan of keeping check of books on order, at every stage, will be found much simpler, and more accurate and convenient than any system of book-keeping. =215. Accession Work.=--When a parcel of new books arrives from the bookseller, or a monthly lot of donations is passed, it is wise to enter each lot in a special book called the routine book, which will determine the order of numbering, and give rough figures of cost and number of additions to all departments. This book is ruled as shown in Fig. 62A, and explains itself. Each new book should be carefully examined for imperfections, etc., before being numbered. The books should next be arranged in order of invoice or donation book, with the lending, reference, branch and children’s books in separate lots. =216.= The ACCESSION NUMBERS must next be applied, and it should be made a rule in every library, whatever method of classification is adopted, to give the books a progressive accession number irrespective of a class number. A special book for recording these numbers can be obtained, one each for the lending and reference libraries, ruled as follows: