Paper of whatever grade is fabricated on a board moistened with water from the Nile: the muddy liquid serves as the bonding force. First there is spread flat on the board a layer consisting of strips of papyrus running vertically, as long as possible, with their ends squared off. After that a cross layer completes the construction. Then it is pressed in presses, and the sheets thus formed are dried in the sun and joined one to another, (working) in declining order of excellence down to the poorest. There are never more than twenty sheets in a roll.