Excerpt from Adjustable ClassiFication for Libraries: With IndexWhen this 'is 'ac'm'; it will be necessary, or at least desirable, to renumber the divisions under each main class, and change the reference numbers in the index.In each main class the class letter alone is given to general works covering the whole or a considerable portion of the subject matter of the class at large. Thus B would mark all the general treatises or dictionaries on the Useful Arts, G general collections of Biography. The letters from M to Z can be reserved for. Special or local collections which are kept separate. It has not been thought advisable to provide for an elaborate system of sub-classes, divisions, and sub divisions, but simply to number in one sequence of even numbers each sub-class or division in its order. This enables the class of most books to be easily expressed by the plain notation of a letter and a figure or two - G 2, B 30, 'f 196, etc. The odd numbers are reserved for fresh divisions of the main classes, and it is thought this feature will be found useful in most libraries where new subjects are continually cropping up.

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