Contractions. - Zinc-s. Zn-s.

Present name. - Zincic Sulphate. ZnSo4,7H1O.

Sulphate of Zinc, White Vitriol.

May be obtained pure from the operative chemists.

Characters and Tests. - In colourless transparent prismatic crystals with a strong metallic styptic taste. Its solution in water gives white precipitates with Chloride of Barium and Sulphide of Ammonium. Its watery solution is not tinged purple by Tincture of Galls, and when acidulated with Sulphuric or Hydrochloric Acid gives no precipitate with Sulphuretted Hydrogen. After it has been boiled for a few minutes with a little Nitric Acid, it yields with Ammonia a white precipitate which is entirely soluble without colour in an excess of the re-agent.

Preparation. - Solution in distilled water for lx; dilute alcohol must be used for 1 and 3X, 20 O.P. spirit for 2, and rectified spirit for all above.

Reference to Horn. Proving. - Noack and Trinks.

Proper forms for dispensing. - lx to 3x, Solution only. 2 and upwards, Tincture, Pilules, or Globules.