Stones Cut in Cameo and Intaglio Techniques, by William and Charles Brown (Fig.35 Signed by Charles Brown Alone). Photographs Reproduced Actual Size. (Hermitage, Leningrad). 34. Catherine Instructing Her Grandsons. Cameo, Sardonyx. 35. Allegorical Representation On the Destruction of the Turkish Fleet. Cameo, Sardonyx. 36. Monument of Peter I by Falconet. Intaglio, Mountain Crystal. 37. Catherine II with a Shield. Cameo, Agate. 38. Allegory The Conquest of Ochakov. Cameo, Sardonyx. 39. Allegory for the Wedding of Aleksandr Pavlovich and Elizabeta Alekseevna. 1793. Intaglio, Cornelian Stone. 40. Allegory On Catherine's Recovery from an Illness. Intaglio, Topaz. 41 Portrait of Catherine II. Cameo, Sardonyx. 42. Catherine Crowning the General. Cameo, Sardonyx. 43. Funerary urn. Cameo, Agate.