In each class the individual articles or the folders containing anumber of articles belonging to the same firm are numbered con-secutively, CI, C2, Tl, T2 etc. that is : a new series of consecutivenumbers is started with each initial letter. The correspondenceof Smith & Co. may for instance be in a folder marked C34, thecatalogues of Jones Bros, may be numbered T89. But theremay be a hundred letters to and from Smith & Co. and a dozencatalogues from Jones Bros, so that it will be necessary to dividefurther until each specific article will have a specific numberby which it can be quoted exclusively reserved to it. This isdone by suffixing the date to the previous numbers thus : C34-3VII7or T89-1906 etc. The former refers to a letter of Smith & Co.dated July the third 1907, the latter refers to a catalogue ofJones Bros, of 1906. No matter how large the files will becomein time, the meaning of these numbers will remain the same, andthere can be no other articles bearing these numbers. If a numberor numbers refer to more than one article, confusion is invariablythe result

Call Numbers

A long alphanumeric ID is an immediate indicator that a train of thought has been developing.