Folio (book)

Definition and stakes

Portrait of Alfred William Pollard Alfred William Pollard,  1911 Encyclopædia Britannica, Volume 3… (1911)

“ In a folio book one of every pair of leaves should have a watermark in the middle of the paper. In a quarto some pairs of leaves will have no watermark; in others it will be found divided by the fold of the paper. As the great majority of books without printed signatures are in folio or quarto, the sequence of watermarked and un-watermarked leaves, if carefully worked out, will mostly reveal the “make-up” of the successive gatherings. ”
Source: Wikisource

1911 Encyclopædia Britannica, Volume 10… (1911)

“ FOLIO (properly the ablative case of the Lat. folium, leaf, but also frequently an adaptation of the Ital. foglio) , a term in bibliography and printing, with reference either to the size of paper employed, or of the book, or to the pagination. In the phrase “in folio” it means a sheet of paper folded once, and thus a book bound up in sheets thus folded is a book of the largest size and is known as a “folio” (see Bibliography) . Similarly, “folio” is one of the sizes of paper adapted to be thus folded (see Paper) . ”
Source: Wikisource

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