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 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 of the sides of the book with surrounding squares; space 3 is the width of the back, and space 4 the width for the overlaps on the fore-edge. The corners are cut, as shown at 5, and the edges are folded over, as at B. The overlap 4 is then turned over, and the back folded, as at C. The slips are now laced through slits made in the vellum.