| Imperial 8vo. | 11 | × | 7½ |
| Demy 4to. | 11 | × | 9 |
| Medium 4to. | 11¾ | × | 9⅝ |
| Royal 4to. | 12½ | × | 10 |
| Imperial 4to. | 15 | × | 11 |
| Crown Folio. | 15 | × | 10 |
| Demy Folio | 18 | × | 11 |
As a final caution, the first and last sheets must be carefully examined; very often the sheet has to be cut up or divided, and the leaf or leaves placed in various positions in the book.
It is also advisable to cut the head of the sheets, using the folding-stick, cutting just beyond the back or middle fold; this prevents the sheet running into a side crease when pressing or rolling. Should such a crease occur the leaf or sheet must be damped by placing it between wet paper and subjecting it to pressure; no other method is likely to erase the break.
Refolding.—With regard to books that have been issued in numbers, they must be pulled to pieces or divided. The parts being arranged in consecutive order, so that not so much difficulty will be felt in collating the sheets, the outside wrapper is torn away, and each sheet pulled singly from its neighbour, care being taken to see if any thread used in sewing is in the centre of the sheet at the back; if so, it must be cut with a knife or it will tear the paper. As the sheets are pulled they must be laid on the left hand side, each sheet being placed face downwards; should they be placed face upwards the first sheet will be the last and the whole will require rearranging. All advertisements may be placed away from the sheets into a pile; these will be found very handy for lining boards, pasting on, or as waste. The title and contents will generally be found in the last part; place them in their proper places. The sheets must now be refolded, if improperly folded in the first instance.
