with cloth back, costing about three cents each.

I think that the rule of never mixing incongruous subjects within the
same cover should be adhered to. The expense, by the cheaper method of
binding referred to, is but slightly greater than must be incurred by
binding several in a volume, in solid half morocco style. But, whenever
pamphlets are bound together, the original printed paper covers should
never be destroyed, but should be bound in.

Another method of preserving pamphlets is to file them away in selected
lots, placed inside of cloth covers, of considerable thickness. These may
be had from any book-binder, being the rejected covers in which books
sent for re-binding were originally bound. If kept in this way, each
volume, or case of pamphlets, should be firmly tied with cord (or better
with tape) fastened to the front edge of the cloth cover. Never use
rubber or elastic bands for this, or any other purpose where time and
security of fastening are involved, because the rubber will surely rot in
a few weeks or months, and be useless as a means of holding together any
objects whatever.

Still another means of assorting and keeping pamphlets is to use
Woodruff's file-holders, one of which holds from ten to thirty pamphlets
according to their thickness. They should be arranged in classes, placing
in each file case only pamphlets on similar subjects, in order of the
authors' names, arranged alphabetically. Each pamphlet should be plainly
numbered at its head by colored pencil, with the figure of its place in
the volume, and the number of the case, containing it, which should also
be volumed, and assigned to shelves containing books on related subjects.
I need not add that all these numbers should correspond with the
catalogue-title of each pamphlet. Then, when any one pamphlet is wanted,
send for the case containing it, find it and withdraw it at once by its
number, place it in one of the Koch spring-back binders, and give it to
the reader precisely like any book that is served at the library counter.

A more economical plan still, for libraries which cannot afford the
expense of the Woodruff file-holders, is to cut out cases for the
pamphlets, of suitable size, from tough Manila board, which need not cost
more than about three cents each case.

In whatever way the unbound pamphlets are treated, you should always mark
them as such on the left-hand margin of each catalogue-card, by the
designation "ub." (unbound)