Section I4 entries
Signatures A · B · C · D
Formats
Format is arithmetic: the number of times the sheet was folded sets the page size, and the page size sets the price, the posture and the market. These entries run from the folio on its lectern to the pocket octavo that Aldus Manutius systematised in Venice in 1501.

Entries in Formats
Filed by fold
- The Aldine octavo
Aldus Manutius put classical texts into pocket format in Venice in 1501 and had Francesco Griffo cut an italic to fit more words on a smaller page.
Signature A
Formats - Folio, quarto, octavo
The format is how many times the sheet was folded, which sets the page size, the price and who the book was for.
Signature B
Formats - Continental editions
Cheap reprints for travellers, and the copyright arrangements that permitted them.
Signature C
Formats - Yellowbacks
Bright boarded reprints sold at railway stalls to be read in one journey.
Signature D
Formats