of some Calamines. 5 It was tinged, exteriorly, brown; but its interior colour was a greenish yellow. , It had considerable hardness; it admitted however of being scraped by a knife to a white powder. 56.8 grs. of it displaced 13.1 grs. of water, at a temperature of 65° Fahrenheit. Hence its density = 4.336. b. Exposed to the blowpipe, it became opaque, more yellow, and friable; spread flowers on the coal, and consequently vola tilized, but not with the rapidity of the foregoing kind from Bleyberg. ' >b t j It dissolved in borax and microcosmic salt, with effervescence, yielding colourless glasses. Carbonate of soda had no action on it. c. It dissolved in vitriolic acid with a brisk effervescence; and 67.9 grs. of it emitted 24.5 grs. = 0.360, of carbonic acid. This solution was colourless; and no .residuum was left. By evaporation, it afforded only vitriol of zinc, in pure limpid crystals. d. 23.0 grs. in small bits, made red hot in a covered tobacco- pipe, lost 8.1 grs. = 0.352. It then dissolved slowly and diffi cultly in vitriolic acid, without any emission of carbonic acid; and, on gently exhaling the solution, and heating the salt ob tained, till the expulsion of all superabundant vitriolic acid and all water, 29.8 grs. of arid vitriol of zinc were obtained. This dry salTwas wholly soluble again in water; and solution of pure martial prussiate of soda occasioned a white precipitate in it. This calamine hence consists of, . 1 Carbonic acid - - - 0.352 Calx of zinc - 0.648 1.000.