Osservazioni di Gio. Batista Piranesi sopra la Lettre de M. Mariette aux auteurs de la Gazette de l'Europe : inserita nel supplemento dell'istessa gazzetta stampata Dimanche 4, Novembre MDCCLIV & parere su l'architettura, con una prefazione ad un nuovo tratatto della introduzione e del progresso delle belle arti in Europa ne' tempi antichi.

Three plates beginning with "Essais de différentes frises ..." are numbered I-III in all copies. Those numbered IV-IX in later printings (Getty c. 1) are signed "Cavaliere Piranesi" produced 1767 ("Cavaliere" bestowed) or after.Piranesi's observations (in Italian) and Mariette's letter (in French) in parallel columns.Printer named after Imprimatur, p. 23.Mode of access: Internet.Library's copy 1 with bookplate of Carl Bonde, said to be a gift to Bonde of Gustavus III or IV, the former a patron of Francesco Piranesi.Library's copies 3-4, each with the 6 leaves of plates unnumbered but signed Cavaliere Piranesi, are bound with Piranesi's De Romanorum magnificentia et architectura (Latin and Italian), Rome, 1761. Shelved as SPECIAL OVERSIZE 83-B2271, c. 3 with 3, c. 4 with c. 1.Library's copy 2, with 6 leaves of plates unnumbered, signed Cavaliere Piranesi, 60 cm., shelved as SPECIAL OVERSIZE 90-B18633-2.Library's copy 1 with: Piranesi's Della magnificenza ed architettura de' Romani (Italian text only), Rome, 1761. Shelved as RARE OVERSIZE 90-B18303 v.2