Some prominent opponents of classed catalogues have admitted that the
Subject Index, in deciding where to class a book at first, and where to
look for it ever afterwards, has removed their strongest objections.
Certainly it would be impossible to make an Index more cheaply or more
easy of reference, it being a single alphabet, of single words, followed
by single numbers.

These class numbers applied to pamphlets have proved specially
satisfactory. The number is written on the upper left corner and the
pamphlets are arranged either in pamphlet cases with the books on
the same subject or on special shelves divided every decimeter by
perpendicular sections. As each pamphlet is examined when received into
the library, it is the work of a single moment to pencil on it its
class number. There is no expense whatever incurred, and yet the entire
pamphlet resources of the library on any subject can be produced almost
instantly. The immense advantages of this plan over those in common use,
both in economy and usefulness, will be appreciated by every librarian
caring for a pamphlet collection. A catalogue of authors may be made
on slips if desired. The pamphlets themselves are the best Subject
Catalogue.

Though designed wholly for library use, the plan has proved of great
service in preserving newspaper clippings in large envelopes arranged
by class numbers; and more especially in taking the place of the common
note-book and Index Rerum. Slips of uniform size are used with the class
number of the subject written on the corner. Minute alphabetical headings
are used under each class number, the slips being arranged in numerical
order like the Subject Card Catalogue. Clippings and notes arranged in
this way are at all times their own complete index, and have the same