be mounted in the following ways:--If the letter
is written upon both sides of a single leaf, it may be either
"inlaid," or guarded, as shown at fig. 74, A. A letter on a folded
sheet of notepaper should have the folds strengthened with a guard of
strong thin paper, and be attached by a guard made, as shown at fig.
74, B; or if on very heavy paper, by a double guard, as shown at fig.
74, C. Torn edges of letters may be strengthened with thin Japanese
paper.

[Illustration: FIG. 74.]

Thin paper, written or printed only on one side, may be mounted on a
page of the book. It is better to attach these by their extreme edges
only, as if pasted down all over they may cause the leaves to curl up.

Letters or any writing or drawing in lead pencil should be fixed with
size before being inserted.

Silver prints of photographs are best mounted with some very
quick-drying paste, such as that sold for the purpose by the
photographic dealers. If the leaf on which they are mounted is
slightly damped before the photograph is pasted down, it will be less
likely to cockle. If this is done, waterproof sheets should be put on
each side of the leaf while it dries. If photographs are attached by
the edges only, they will not be so liable to draw the paper on which
they are mounted; but sometimes they will not lie flat themselves.

In cases where very thick letters or papers have to be pasted in, a
few more leaves of the book should be cut out, to make a corresponding
thickness at the back.

VELLUM BINDINGS

Vellum covers may be limp without boards, and merely held in place by
the slips being laced through them, or they may be pasted down on
boards in much the same way as leather.

If the edges of a book for limp vellum binding are to be trimmed or
gilt, that should be done before sewing. For the ends a folded piece
of thin vellum may replace the paste-down paper. The sewing should be
on strips of vellum. The back is left square after glueing, and
headbands are worked as for leather binding, or may be worked on
strips of leather, with ends left long enough to lace into the vellum
(see p. 151). The back and headbands are lined with leather, and the
book is ready for the cover.

A piece of vellum should be cut out large enough to cover the book,
and to leave a margin of an inch and a half all round. This is marked
with a folder on the under side, as shown at fig. 75, A. Spaces 1 and
2 are the size