De occultis literarum notis seu artis animi sensa occulte aliis significandi, aut ab aliis significata expiscandi enodandique libri IIII. Io. Baptista Porta Neapolitane auctore. Explicantur autem inter caetera & veterum quoque scriptorum loca, hac de arte loquentia indidemque petita.

Montbéliard, Jaques Foillet for Lazarus Zetzner, 1593.

8vo, pp. [xvi], 275 (recte 271), 24, [16], woodcut device on title, with numerous woodcut diagrams, and tables in the text; title with small portion cut away from upper margin, touching a couple of letters of the beginning of the title, the T of Porta erased from title, two leaves cropped at outer margins; a very good copy in contemporary blind-stamped pigskin, a little rubbed; Nordkirchen bookplate.


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Third edition (the second authorised), revised by the author, complete with appendix, index, and three volvelles, as yet unassembled, on one sheet. this edition includes at the end ‘cryptology’s first set of synoptic tables. These showed in graphic form the path the cryptanalyst must follow in his analysis of a given cryptogram, with the forks he must take if the message shows one characteristic as opposed to another’ (Kahn pp. 142-143).

Caillet 8856, note; Galland p. 147; Riccardi I/2 309; Roller and Goodman II, p. 320; Wheeler 67 (without index; both Riccardi and Roller and Goodman call for 11 pages of index only).


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