As the gathering of the sheets of a book, after they have been printed and dried off, is nearly always performed at the printer's, it will not be necessary to enter into any details on that subject, but to consider as the commencement of binding, the operation of

FOLDING,

which is of great importance, the beauty of a book depending on its being properly and correctly folded, so that, when it is cut, the margin of the different pages may be uniform throughout, and present no transpositions, to the inconvenience of the reader and deterioration of the work.

The various sizes of books are denominated according to the number of leaves in which the sheet is folded; as folio, quarto, octavo, 12mo, 16mo, 18mo, 24mo, 32mo, &c. Each form presents a certain number of pages, so disposed that, when the sheet is properly folded, they will follow the numeric order. In commencing the folding of any work, particular attention should be paid, in opening out the quires or sets, to observe that the signatures follow each other alphabetically, and, if consisting of two or more volumes, that the whole of the sheets belong to the right one.

Although each form is folded in a different manner, it will not be requisite to detail the whole, as a description of the octavo and twelvemo will amply furnish an idea of the proper way of folding the larger and smaller sizes.