This inventory does not prevent supplies from running out suddenly, and thereby producing undesirable misunderstandings. There are many ways of effecting this check, all more or less satisfactory, but none, perhaps, is quite so certain as an actual material check upon the running-out of supplies. In addition to the inventory it is necessary to establish an “emergency-supply” cupboard, safely locked up, and in it to place a small stock of everything which is liable to run out. Thus, if two reams of foolscap arrive, a five-quire packet must be taken from it, separately parcelled up, and deposited in the emergency-supply receptacle. Attached to this emergency bundle should be a luggage label, or other conspicuous tag, bearing the words “Foolscap, ruled faint, order No. 69, Stock exhausted. . . .” The blank space is for the date when the emergency supply is transferred to the ordinary stock cupboard. In course of time the accessible stock is used up, and the person who removes the last sheet, or the one who next goes, discovers the shortage, and is forced to ask the key-keeper of the emergency cupboard for the reserved stock. This is produced, the label is dated and handed to the person responsible for ordering a fresh supply. =328.= All general library KEYS may be assembled on a special key-board. This should consist of a large board fitted with the necessary number of hooks, one for each key or group of keys, and a proper descriptive label and number should be pasted under each hook. The keys should be numbered and labelled to correspond, with ivory labels attached by rings to every key. In addition an alphabetical list should be fixed to the door of the key-board, so as to facilitate finding. In some libraries the departmental heads and assistants are provided with a master-key to all internal doors which concern them; but keys which give access to the building as a whole should be limited to the chief librarian and the chief caretaker. A large building requires many keys, and a card-index, entering of the name of each key and the person who holds it or its location, is a useful method of checking the safety of keys. When keys are removed from the building, they should be insured with one of the key insurance or registry offices.