The total weight of the specimen was 44·36 grains. The metal was much corroded on both surfaces. The convex or outer surface was completely covered with a somewhat irregular crust while the concave or inner surface was only partly covered with a similar crust, and partly with a yellowish tarnishlike film. When broken across, the fractured surface of the crust on both sides of the metal was found to be in two distinct layers; that next the metal was black, dull, somewhat sectile, and easily broken; while the other, or outer layer, was light-grey, soft, sectile, and wax-like. In some places the metal was corroded completely through. The crust was removed by warm dilute ammonia-water and gentle rubbing; the residual metal was found to be very brittle, much pitted on the surface, dull white in fracture, granular, and containing minute irregular cavities; no appearance of fibre or crystalline structure was observed, even with the aid of the microscope. By annealing, the softness and malleability of the metal were restored in a marked degree. The thickness of the specimen, inclusive of the crust on one surface only, was 1-25th of an inch; and where the crust was thickest it was 1-20th of an inch. The thickness of the metal, after the removal of the crust by dilute ammonia-water and rubbing, was 1-40th of an inch. A portion of the specimen was selected for analysis to which the crust was attached on the convex or outer surface only, and which was comparatively free from crust on the opposite surface; the quantity operated on was 15·786 grains. By repeated treatment with warm moderately strong ammonia-water, gentle rubbing, and washing with warm water, the crust was easily removed; most of it being dissolved by the ammonia-water, which became pale blue, while the insoluble part was left as a brownish black powder, intermixed with some particles of metallic silver. The metal, after this treatment and drying, weighed 11·823 grains. The metal itself (_a_), the portion of the crust soluble in ammonia-water (_b_), and the residue insoluble in ammonia-water (_c_) were separately analysed, with the following results:-- COMPOSITION PER CENT. (_a_) _Metal._ Silver 71·60 Gold 0·22 Copper 2·42 Lead 0·33 Iron 0·09 Chlorine traces ------ 74·66