classifications of progressive fullness, the first having only 11
classes, which would be enough for a very small library; the second
having 15 classes and 16 geographical divisions, suiting the small
library when it has grown a little larger; the third having 30 classes
and 29 geographical divisions; and so on, till the seventh would
suffice for the very largest library. The same notation is used
throughout, so that a library can adopt the fuller classification with
the least possible change of mark.

It often suggests alternative places for a subject, stating the
reasons for and against each, so that classifiers have a liberty of
choice according to the character of their libraries, or of their
clientage, or their own preferences.


The notation

The original feature of this notation is the use of letters to mark
non-local subjects and figures for places. This makes it possible to
express the local relations of a subject in a perfectly unmistakable
way, the letters never being used to signify countries, and the
figures never being used for any other subjects but countries. Thus 45
is England wherever it occurs; e.g. F being history and G geography,
F45 is the history of England, G45 the geography of England. This
local notation can be used not merely with the main classes, but in
every subdivision, no matter how minute, which is worth dividing by
countries. Whenever one wishes to separate what relates to England
from other works on any subject one has only to add the two figures
45. Whenever one sees 45 in the mark of a book one knows that the book
so marked treats its subject with special reference to England. This