=289. Placard Catalogues.=--The most ordinary form of placard catalogue is a manuscript or printed list of books on a large sheet or sheets, which is framed and hung on the wall where readers can see it. There are several varieties of these framed lists, which are used chiefly for lists of additions. A form giving the power of moving single entries has been devised in England which is better than anything else usually seen. This consists of a frame with a movable back, on which vertical xylonite slips are fastened in such a way as to form long columns with flanged sides. Under the flanges can be slipped pieces of cardboard the width of the columns, which slide up and down in the length of the column as required. The titles of new books can be written on these cards and arranged in any order. If blank cards are left between every letter of the alphabet or every class, additional entries can be added at any moment. If several frames are used, some hundreds of new books can be catalogued, and when full the entries can be transferred to the printed bulletin, or otherwise utilized, to free the frames for further additions. The illustration given above will show the nature of this adjustable accessions catalogue, which corresponds in principle with the adjustable Periodical List. =290. Panoramic Catalogues.=--Several methods have been proposed or devised for displaying catalogue entries on an endless chain in a panoramic or continuous form, but none of them has been generally adopted. BIBLIOGRAPHY (CHAPTERS XVI.-XVIII.) The principal literature of the subject of cataloguing has been mentioned in the text, and much of the best, more recent writing is in periodicals; moreover, every general work on libraries has a chapter or more on the subject. The following is offered as a selection of the literature in separate form:-- =291. General:= Bishop, W. W. Practical Handbook of Modern Library Cataloguing, 1914. Baltimore: Williams & Wilkins. Delisle, Léopold. Instructions Elémentaires et Techniques pour la Mise et le Maintien en Ordre des Livres d’une Bibliothèque, 1910. Thorne, W. B. First Steps in Library Cataloguing, 1917. L.A.A., Series 8. Wheatley, H. B. How to Catalogue a Library, 1889. Stock. =292. Codes, Rules, etc.:= Aberdeen University Library. Condensed Cataloguing Rules, 1914. New York State Library School. Fellows, J. D. Cataloguing Rules: for the Course in Elementary Cataloguing, 1914. Library School, 36. Wisconsin University Library School. Turvill, Helen. Cataloguing Rules, 1912. =293. Annotation:= Savage, E. A. Manual of Descriptive Annotation in Library Catalogues, 1906. Grafton. Sayers, W. C. Berwick. First Steps in Annotation in Catalogues, 1918. L.A.A., Series 9. =294. Children’s Catalogues= (see also Division XIII.): Sayers and Stewart. Catalogues for Children: with a Code of Rules, 1905. =295. Subject Headings:=