180 x 230 mm. 1 p. on bifolium.
Presenting a specimen (a foot which could be used as a paper-weight) to an unnamed Duke. An attractive and clearly written letter. A pamphlet concerning a gilding furnace to which reference is made is likely to be the "Description d'un petit fourneau à coupelle, au moyen duquel on peu faire les essays des matières d'or et d'argent", which d'Arcet published in 1813.