ABSTRACT
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, 24 mo, 32mo, &c. Each form presents a certain number of pages, so disposedthat, when the sheet is properly folded, they will follow the numeric order. Books are sometimes printed in what is called half sheets, but they are folded the same, after cutting them up ; the octavo in the direction of the points, the twelvemo in oblong direction of the paper, and laying them apart from each other. The sheets of the book being all folded, are gathered together, beat up between the hands on the table to bring them even, and then to see that the whole of the sheets belong to the same work and volume, as also that none are wanting.
