On the art of cataloguing rare books. Each entry must record precisely how "a book has survived the ravages of time" in as little space as possible. There is a secret language for this. "Foxed" means the pages are mottled. "Sophisticated" denotes a probable fake, but an interesting one. Sheepskin binding is "roan" and calfskin "vellum". Every bookseller uses these terms in their own way, too (1,752 words).