ould be placed in subclass
"History" in the subject-matter group, and a French book in green cloth
would be placed in subclass "French" in the language group. That is,
combinations of any characteristic with any one or more other
characteristics may be placed in the group for that characteristic
deemed the most significant and which is highest in the schedule. Again,
by assigning a number to each generic title, each such title becomes
thereby the miscellaneous group for varieties other than those indented
under it, as well as for all varieties associating any characteristic
with one or more of those standing lower down. Thus, a book of poems
would belong in subclass "Subject-matter" and a 16mo volume bound with
purple celluloid covers would belong in subclass "Size." So, by giving
meaning to relative position, exhaustive arrangement is sought to be
provided in a reasonable number of groups. To provide for other features
that may be presented in future, an additional miscellaneous group may
be added at the top (1), or the class title (2) might be deemed to
represent the unclassified residue and a depository for future matter
not specifically provided for.

(2) If the number of instances of association of subject-matter and
binding materials, language and size, etc., are numerous, additional
groups might be placed above the groups having the names of the
characteristics, the fact of the existence of these groups indicating
that the characteristic groups are for single characteristics only and
do not include books having several different ones. In such case the
schedule might be headed by a miscellaneous group, having either the
title "Miscellaneous" or the title of the class, to receive associated
characteristics not provided for by specific titles, immediately
followed by subclasses for the particular associations found to be most
numerous, as follows:

BOOKS.

Miscellaneous.
Subject-matter and language.
Subject-matter and binding material.
Subject-matter.
Language.
Size.
Binding material.

To illustrate further, selecting for the purpose a mass of objects
presenting problems more nearly like those presented to the office in
questions of patentability, let it be assumed that one is to classify
the objects in a heap of metal scrap.

On looking over the material of the heap it is noticed that there are a
large number of metal balls; some have holes through them, some are
hollow, some are smooth on the out