Mercury, or the Secret and Swift Messenger: Shewing How a Man may with Privacy and Speed Communicate His Thoughts to a Friend at any Distance. Second Edition. Full antique calf with raised spine and minimal decoration. Portrait frontispiece, reverse of which is printed with publisher's advert for other Wilkins-authored books. 8 leaves, pg 1-172, and 2 leaves adverts at rear. Illustrated with diagrams in text. Due to the poor quality paper used for this edition, pages are heavily foxed throughout, though text is generally clear. Important work related to cryptography and cyphers. General age-consistent wear to binding, with corners and spine in particular effected. Hinges starting. Toole Stott 732.