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    [Pierre de Rosnel]. Le Mercure Indien, ou le Tresor des Indes... Paris: [No publisher, Avec Privilege du Roy], 1672. Best and most complete edition of this popular metallurgical treatise. Three parts bound in one. Small quarto (8 x 6 inches; 205 x 158 mm.). [viii], [36]; [viii], [72]; 23 pages. Part three bound without preliminary leaves. Bound in contemporary full calf, spine tooled in gilt in compartments, brown gilt morocco lettering label, five raised bands. Binding worn and soiled. Hinges cracking, gutter facing first title-page cracking with some damage to inner margin of that page. Rear free endpaper lacking. Endleaves with extensive ink notes and drawings. Ink notations to first title-page and occasional ink markings throughout. Text toned, soiled, worn, with occasional foxing. Still, a good example of this very rare treatise. Hoover 692; Sabin 73297; Sinkankis 5569.

    "This was long considered one of the best manuals of the gold- and silversmith's trade. Rosnel rejected the alchemists and displayed a profound knowledge of metals and alloys" (Hoover). "The first part of the much esteemed and sought for work by the Parisian goldsmith is a mining and metallurgical treatise in which gold, silver, and mercury are described in respect to their mines and methods of mining, purification of ores by smelting or otherwise, and refinement of the metals. Special emphasis is laid upon the New World.... [The second part] precedes the publication of the standard method of pricing as described by J. E. Tavernier, Les Six voyages, 1767, often cited as the earliest publication of the rule, and by far anticipates the similar rule published by David Jeffries in his A Treatise on Diamonds and Gems, 1750" (Sinkankis).

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