4 Mr. Smithson’s chemical Analysis by carbonate of soda, and the filtered liquor let exhale slowly in the air; but it furnished only crystals of muriate of soda. e. 10 grs. dissolved in acetous acid without leaving any resi duum. By gentle evaporation, 20.3 grs. =t 2.03, of acetite of zinc, in the usual hexagonal plates, were obtained; These crys tals were permanent in the air, and no other kind of salt could be perceived amongst them. Neither solution of vitriolated tartar, nor vitriolic acid, occa sioned the slightest turbidness in the solution of these crystals, either immediately or on standing; a proof that the quantity of lime and lead in this solution, if any, was excessively minute. /. A bit of this calamine, weighing 2.0.6 grs. being made red hot in a covered tobacco-pipe, became very brittle, dividing on the slightest touch into prisms, like those of starch, and lost 5.9 grs. of its weight = 0.286. After‘this, it dissolved slowly and difficultly in vitriolic acid, without any effervescence. • According to these experiments, this calamine consists of, ’• Calx of zinc : <- J ‘ * j - y 0.714 Carbonic acid ■ '> - ^ -1 0.135 uni. Water ^ - — - 0.151 ' " ” y>iU(f ii l.OOO. The carbonates of lime and lead in it are mere accidental admixtures, and in too small quantity to deserve notice. i/ i . ' r Calamine from Somersetshire. a. This calamine came from Mendip Hills in Somersetshire. It had a mammillated form; was of a dense crystalline tex ture; semitransparent at its edges, and in its small fragments; and upon the whole very similar, in its general appearance, tq calcedony.