Present name. - Nickel Sulphate.

Sulphate of Nickel. NiSo4,7H1O.

This salt is formed by dissolving Carbonate of Nickel in dilute Sulphuric Acid, concentrating the solution, and setting it aside to crystallize.

Characters and Tests. - Emerald green prismatic crystals, efflorescent in the air, soluble in 3 parts of cold water, but insoluble in alcohol and ether. It has a sweet, astringent taste. The solution gives a black precipitate with yellow Sulphide of Ammonium, slightly soluble in excess, forming a dark brown solution, and a pale green bulky precipitate with Caustic Potash.

There is no proving, but Hale in his New Remedies gives some references as to the theurapeutic value of this preparation.

Preparations. - Trituration. Solution in distilled water.