Rarities, or, The incomparable curiosities in secret writing, both aswel [i.e. as well as] by waters as cyphers, explained and made familiar to the meanest capacity by which ministers of state may manage the intrigues of court and grand concerns of princes, the ladies communicate their amours, and every ordinary person (onely capable of legible writing) may order his private affairs with all imaginable safety and secrecy ... / by G.B.

Abstract

Reproduction of original in Cambridge University Library. Advertisements on p. [1]-[2] at end.