the strength of the paper ordinary sewing may be satisfactory. The folding of paper in 95 per cent of fiction and juvenile books weakens it at the fold over 50 per cent. In a good piece of paper the fold weakens it not over 5 per cent.

The problem of paper is a modern one, due to the use of wood pulp and other short-fibred materials in paper manufacture. All binders complain bitterly of the impossibility of binding it properly. The librarian, however, should know the way in which it can be bound to give the maximum amount of service and should not allow a binder to blame the paper for faults which are due to his ignorance or to poor workmanship.

While the customs of library binders vary somewhat according to the prejudices of the different men, the following description covers the binding processes carried out at most binderies.

1. Taking Apart

After the books have been checked with the statement of the librarian to see that the correct number has been received, each one is taken apart carefully and all old threads, glue, paste, etc., removed from the back. If the book is in a regular machine sewed publisher's cover it will be comparatively easy to remove old threads and glue from the back. If in an old hand sewed one, it may be a little more difficult.

The book is first removed from the cover. The first signature is then turned back and threads cut with a sharp knife. Generally this will loosen the signature so that it can be separated easily from the rest of the volume. If it is still held by glue and there is danger of injuring the back of the signature, a bone folder is used. If the book had a tight back and the leather, back-lining paper and glue form a very firm back not easily separated in the manner described, the glue may be softened with paste or warm water, with care necessary to prevent the dampness from penetrating the book.

2. Collation

The book should then be collated. The best library binders make themselves responsible for page collation but they do not bother to see that all plates, illustrations, maps, etc., which may be called for by the table of contents, are in proper place. In the case of periodicals they do not always discover the fact that certain parts, not included in the main paging, are missing. Their collation is that of main paging only. Periodicals must, therefore, have title page, table of contents and index in their proper places. Books with two or more main pagings or many unpaged illustrations must be collated at the library. (See Preparing for the bindery, p. 125.)

3. Knocking Down

(a) Backs of signatures are then pounded down so that they may be as nearly as possible the same thickness as the front of the signatures. Care must be taken to have a clean hammer and to let it fall evenly on the paper. If the backs are not properly pounded down there is likely to be too much swell in the back of the book when it is finally sewed. In all the first processes of binding the question of undue swelling of the back must be taken into consideration.

(b) If the book must be overcast when it comes to be sewed, the back is not only pounded down at this stage, but it is also put under the knife and entirely cut off, leaving single leaves instead of folded sections. If it is not pounded it cannot be cut properly. The success of overcasting depends largely on the amount of margin at the back, so that care must be taken not to cut more than is absolutely necessary.

4. Mending

Leaves are mended with thin tough paper. The librarian should not, however, expect binders to mend books which have a large number of torn leaves without making an extra charge.

5. Gluing

Books which are to be overcast and which have had the backs cut off are slightly glued to hold the leaves together. A sufficient number can then be taken off and handled as a section without coming apart.

6. Fly Leaves Guarded

Fly-leaves, made of kraft or manila paper running about 60 pounds to the ream, which have previously been guarded with cloth are added to the book. In guarding, a strip of cloth is pasted around the back of the folded fly-leaf covering about one quarter of an inch on each side. When the book is sewed the needle passes through the cloth as well as the paper. Different binders use different materials for guarding fly-leaves, end papers and signatures. It must, however, be a cloth of close weave, strong, and light in weight. The English cloth called jaconet, used by some binders, is probably as satisfactory as any.

This is one part of library binding which differs radically from the custom in ordinary hand work. Old-fashioned binders, unless properly instructed, will simply fold a piece of paper, and tip it on to the first and last signatures with paste, thus forming an element of weakness instead of strength. When the fly-leaves are guarded and properly sewed they become an integral part of the book and no tipping is necessary.

7. Sections Guarded

At this point it is also necessary to guard the first and last signatures of books which are to be sewed in the regular way. Overcast books do not need such guards.

Guarding of first and last signatures is another of the distinctive features of library binding. In the case of books bound in the regular fashion the sewing invariably first gives way at the first and last signatures. Guarding with jaconet prevents the threads which lie in the middle of the signatures from pulling through the paper. This method is essential if it is supposed that the book will be much used. It is not essential for books which will be used only occasionally.

8. Illustrations Guarded

Illustrations are guarded with a thin, tough paper, not with cloth. The guard folds around an adjoining signature and is sewed through.

9. Sawing

If the book is not to be overcast, it is screwed tightly into the backing-press and sawed to make the grooves in which the bands or twines are laid when the book is sewed. Grooves for three bands must be made for books eight inches high, four for twelve-inch books and five for fifteen-inch books. For fiction two bands are used. There must also be two additional grooves, much shallower than the others, about one half inch from the head and tail of the book for the kettlestitch.

After the grooves for kettlestitch have been sawed the two grooves for bands will divide the rest of the back into three equal parts. For fine work it is necessary to measure the book carefully and mark with a pencil; but in most library work measurement by the eye alone is sufficient. In sawing, care must be taken not to saw too deeply, since too deep a cut allows the signature to play back and forth and is plainly visible inside.

There are some good library binders who overcast books in the modern way, and yet who sew on bands. Such binders will at this point saw all books. There are also some good library binders who use no bands when overcasting and who sew all other books on tapes. These binders omit sawing.

10. End Papers Added

At this point it is best to add end papers. These are always guarded on the outside of the fold and sometimes on the inside. They should be made of good, strong paper somewhat heavier than that used for fly-leaves. Some binders have special papers made to order with a design