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It is a hydroguretted sulphuret of ammonia, and was first preparedby Boyle.Incompatible with acids.

Medicinally in doses of five drops to ten drops twice or thrice a day.It is a sedative and nauseant in diabetes, &c. in any vehicle notcontaining acids.

Aqua Sulphubeti Potasse. D. Water of sulphuretted potass, beinga sulphuretted hydro-sulphuret of potass. Externally it is detergentin herpes, scabies, and tinea ; internally in doses of twenty drops to5ij twice a day in herpes, and hypersalivation, also as an antidote tometallic poisons, in any vehicle not containing acids.

Aqua Supercabbonatis Potass^e. E. Water of supercarbonate ofpotass, prepared from Ox of water, and 3J of pure carbonate ofpotass in solution, and impregnated with carbonic acid gas in Nooth'sapparatus.Medicinally it is antacid and diuretic, and may be used as commondrink in dyspepsia, gout, and gravel arising from uric acid.

Aqua Supercarbonatis Sod^e. E. Water of supercarbonate of Soda,or Soda Water. Prepared as the preceding, and is perhaps superioras an antacid, diuretic, and lithontriptic, while it is more pleasant.It may be used as common drink in dyspepsia, and febrile affections,or with lemon juice as an effervescing draught.

Aqua Tofkana, or Tophana. An Italian secret poison, the prepara-tion of which was kept a secret, but it is supposed to be a so-lution of arsenic. It is said to produce phthisis when used for sometime.

Aqua Vrr.93. Water of Life, the Latin name for brandy, or Ettu de vie.

Aque Distillate. L. D. Distilled Waters, are prepared by distillingflowers and other fragrant substances, and are used in medicines asgrateful vehicles for unpleasant substances, and in perfumery fortheir fragrance. They may be made artificially by means of essentialoils rubbed up with sugar or magnesia, creta preparata, &e.

Aqua Minerales. Mineral Waters, i. e. waters impregnated natu-rally or artificially with mineral substances. See the principal ofthese under their several heads, viz. Chalybeate ; Cheltenham ;Seidlitz ; Seltzer; Spa; Pyrmont, &c, where methods of pre-paring the artificial waters are given.

Arabic (Gum.) See Acaci/e Gummi, and Emuls. Acac. Arab.

Aranearum (Tela). See Tela.

Arbutus. See Uva Ursi.

Akchel, or Archill Litmus. A dye stuff prepared from variousspecies of Lichens, as Lic/ien rucclla, L. calcarcus, L. parcllus.The lumps arc prepared by reducing the substance to powder, and