Patent Office Library : Subject Lists. SUBJECT LIST OF WORKS OF REFERENCE, BIOGRAPHY, BIBLIOGRAPHY, THE AUXILIARY HISTORICAL SCIENCES, ETC., LONDON: PRINTED FOR HIS MAJESTY'S STATIONERY OFFICE, BY DARLING & SON, LD., 34-40, BACON STREET, E. PUBLISHED AT THE PATENT OFFICE, 25, SOUTHAMPTON BUILDINGS, CHANCERY LANE, LONDON, W.C. 3 die droved 9-21-30tbit GENERAL PREFACE TO NEW SERIES, The New Series of Subject Lists issued as guides to the contents of the Library will preserve the same form and general arrangement as the former one, with the following addition, viz., that the headings will contain certain marks indicating the location of classes of books in the Library. These marks consist of two divisions-(a) the class mark, which follows the heading ; (b) the individual or work-mark, which is prefixed to the entry of the work. (a) The class-mark consists of a combination of the letters of the double alphabet AA-ZZ and the numerals 0-99, and the relative position of a class of books in the library is determined by the sequence of their marks, e.g. (From "Key,” p. 324), tarit Patent office AC 50 Science : Bibliography. History. See also AB 52, Inventions and Origins. Errors and Satires. 99 (6) To determine the place of a book in a class a further mark, known as the “work-mark," has to be given. In the new Library classification, now being introduced, the order of books in a class is chronological. Hence the addition of the date mark (abbreviated by the omission of the numeral in the fourth place, e.g., 875=1875) defines with sufficient accuracy the place of an individual work, e.g. (From “ General Alphabet,” p. 130), ENGLISH LANGUAGE: DICTIONARIES. AA 37 888 Murray, Sir J. A. H. A new English dictionary on historical principles. Oxford, 1888, etc. 4o. In case of two works in the same class published in the same year their arrangement is alphabetical. The value of chronological order in the final arrangement of entries under subject headings and in shelf arrangement will be evident to those trained in the methods of historical research. The order enables a student to select his own period of study, to trace the history of a subject from its source to its final development in the latest treatise on a subject, which of course is always to be found at the end of the class in question. The arrangement bas the further advantage that it enables a class to be divided and the less frequently consulted portion to be removed to another part of the building without detriment to the searcher, who is informed by a notice on a wooden block on the shelves that books in that class prior to a given date are shelved elsewhere. Size marks.-In case of books over a certain size, economy of space and other considerations require their separate shelving. Three divisions of size have been made, the octavo (for books under 12 inches in height), quarto (between 12 and 17 inches in height), and folio (over 17 inches in height). The two latter divisions are distinguished by the following marks placed after the work mark” : Special marks.— The addition of an asterisk (*) or asterisks (**) to the work mark indicates that the work in question is not to be found on the open shelves, but is sbelved elsewhere in the library buildings. Access to such works is obtainable on |