Stated briefly the work of the intelligence department can be 50brought under the three heads: filing, indexing and summarising.

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

The real heart of the matter of selection, however, goes deeper than a lag in the adoption of mechanisms by libraries, or a lack of development of devices for their use. Our ineptitude in getting at the record is largely caused by the artificiality of systems of indexing. When data of any sort are placed in storage, they are filed alphabetically or numerically, and information is found (when it is) by tracing it down from subclass to subclass. It can be in only one place, unless duplicates are used; one has to have rules as to which path will locate it, and the rules are cumbersome. Having found one item, moreover, one has to emerge from the system and re-enter on a new path.

Point 3 is almost certainly the one that still bugs Doug. All sorts of mechanisms and utilities are around and used (source code control, registries, WWW search engines, and on and on), but the problem of indexing and finding relevant information is tougher today than ever before, even on one's own hard disk, let alone the WWW.

The real heart of the matter of selection, however, goes deeper than a lag in the adoption of mechanisms by libraries, or a lack of development of devices for their use. Our ineptitude in getting at the record is largely caused by the artificiality of systems of indexing. When data of any sort are placed in storage, they are filed alphabetically or numerically, and information is found (when it is) by tracing it down from subclass to subclass. It can be in only one place, unless duplicates are used; one has to have rules as to which path will locate it, and the rules are cumbersome. Having found one item, moreover, one has to emerge from the system and re-enter on a new path. The human mind does not work that way. It operates by association. With one item in its grasp, it snaps instantly to the next that is suggested by the association of thoughts, in accordance with some intricate web of trails carried by the cells of the brain. It has other characteristics, of course; trails that are not frequently followed are prone to fade, items are not fully permanent, memory is transitory. Yet the speed of action, the intricacy of trails, the detail of mental pictures, is awe-inspiring beyond all else in nature.