Too much prominence should not be given to place-numbers in library catalogues. The tendency to substitute mere numerical signs for authors and subjects has been carried so far in some libraries, that books are called for and charged by class-numbers only, instead of their distinctive names. An English librarian testifies that assistants trained in such libraries are generally the most ignorant of literature. When mechanical or mnemonical signs are wholly substituted for ideas and for authors, is it any wonder that persons incessantly using them become mechanical? Let catalogue and classification go hand in hand in bringing all related books together, and library assistants will not stunt their intellects by becoming bond-slaves to the nine digits, nor lose the power of thought and reflection by never growing out of their _a b c's_. There are two forms of catalogue not here discussed, which are adjuncts to the library catalogue proper. The accession catalogue, kept in a large volume, records the particulars regarding every volume, on its receipt by the library. It gives author, title, date, size, binding, whence acquired, cost, etc., and assigns it an accession number, which it ever after retains. The shelf catalogue (or shelf-list) is a portable one divided into sections representing the cases of shelves in the library. It gives the shelf classification number, author, brief title and number of volumes of each book, as arranged on the shelves; thus constituting an inventory of each case, or stack, throughout the library. To check a library over is to take an account of stock of all the books it should contain. This is done annually in some libraries, and the deficiencies reported. All libraries lose some books, however few, and these losses will be small or great according to the care exercised and the safe-guards provided. The method is to take one division of the library at a time, and check off all books on the shelves by their numbers on the shelf-list, supplemented by careful examination of all numbers drawn out, or at bindery, or in other parts of the library. Not a volume should be absent unaccounted for. Those found missing after a certain time should be noted on the shelf-list and accession book, and replaced, if important, after the loss is definitely assured.