r until pages 3 and 6 come exactly
over pages 2 and 7; and when it is seen that the headlines and figures
exactly match, the paper, while being held in that position, is
creased down the centre with the folder, and the fold cut up a little
more than half-way. Pages 4, 13, 5, 12 will now be uppermost; pages 12
and 5 are now folded over to exactly match pages 13 and 4, and the
fold creased and cut up a little more than half-way, as before. Pages
8 and 9 will now be uppermost, and will merely require folding
together to make the pages of the section follow in their proper
order. If the folding has been done carefully, and the "register" of
the printing is good, the headlines should be exactly even throughout.

[Illustration: FIG. 3.]

The object of cutting past the centre at each fold is to avoid the
unsightly creasing that results from folding two or more thicknesses
of paper when joined at the top edge.

A "duodecimo" sheet has the pages arranged as at fig. 4.

The "inset" pages, 10, 15, 14, 11, must be cut off, and the rest of
the section folded as for an octavo sheet. The inset is folded
separately and inserted into the centre of the octavo portion.

Other sizes are folded in much the same way, and the principle of
folding one sheet having been mastered, no difficulty will be found in
folding any other.

Plates often require trimming, and this must be done with judgment.
The plates should be trimmed to correspond as far as possible with the
printing on the opposite page, but if this cannot be done, it is
desirable that something approaching the proportion of margin shown at
fig. 2 (folio) should be aimed at. That is to say, the back margin
should be the smallest, the head margin the next, the fore-edge a
little wider, and the tail widest of all. When a plate consists of a
small portrait or diagram in the centre of the page, it looks better
if it is put a little higher and a little nearer the back than the
actual centre.

[Illustration: FIG. 4.]

Plates that have no numbers on them must be put in order by the list
of printed plates, or "instructions to the binder." The half-title,
title, dedication, &c., will often be found to be printed on odd
sheets that have to be made up into section A. This preliminary matter
is usually placed in the following order: Half-title, title,
dedication, preface, contents, list of illustrations or other lists.
If there is an index, it should be put at the end of the book