B300 Architecture, General B300·1 -- Bibliography B300·2 -- Dictionaries B300·3 -- Text-books, Systematic B300·4 -- -- Popular B300·6 -- Societies B300·7 -- Periodicals B300·10 -- History
If, in addition to those general works, the library possessed several hundreds of books on Building Construction, B305, these would be subdivided in exactly the same manner, as would also any subdivision of the same topic, such as Foundations, Walls, Roofs, etc.:
B305·1 Building Construction, Bibliography B305·3 -- -- Text-books, Systematic B305·10 -- -- History B329·1 Roofs, Bibliography
These categorical tables are therefore of universal application, and as they contain nearly one thousand qualifying forms, phases, etc., it will be seen that their use will greatly simplify the practical work of classification.
As will be seen by the above examples, the symbols of the Notation are perfectly simple combinations of letters and numbers. By treating the numbers decimally, it is possible to intercalate as many new ones as desired between any of the existing numbers, thus providing an infinity of places.
The Index is very extensive in the number of subject-words it contains, and comprises practically every topic likely to be encountered in ordinary practice. The Classification Tables themselves provide places somewhere for every remote subject, and the Introduction describes how such out-of-the-way matters are to be treated.
It is impossible to set forth all the features of this system of classification--its elaborate series of _biographical numbers_ for arranging Fiction, Poetry and other alphabetical classes; its new system of short _date-marks_; its rules for the _arrangement of special subjects_, authors, etc.; and its notes on the simplification of the whole subject of book classification. Reference can only be made to the Summary Table of Main Classes for an idea of the size and style of the book.
SUMMARY TABLE OF MAIN CLASSES, WITH ABRIDGED NOTATION
A--Generalia B-D--Physical Science E-F--Biological Science G-H--Ethnology, Medicine I--Economic Biology, Domestic Arts J-K--Philosophy and Religion L--Social and Political Science M--Language and Literature N--Literary Forms, Fiction, Poetry O-W--History and Geography X--Biography