Rare Books

Cryptomenysis patefacta:, or, The art of secret information disclosed without a key. : Containing, plain and demonstrative rules, for decyphering all manner of secret writing with exact methods, for resolving secret intimations by signs or gestures, or in speech. : As also an inquiry into the secret ways of conveying written messages, and the several mysterious proposals for secret information, mentioned by Trithemius, &c