Present name. - Arsenious Iodide. Asi3.

Prepared by subliming a mixture of 1 part of Metallic Arsenic with 5 parts of Iodine in a flask by the aid of a gentle heat.

Characters and Tests. - Brick-red crystalline flakes, soluble in boiling water, giving off violet fumes when boiled with Nitric Acid.

A notice of the use of this compound, but no provings, appeared in B. J. H., xxvi.; and a proving has since appeared in Hale's New Remedies.

Preparation. - Trituration.

Arsenicum Citrinum.

Present name. - Arsenious Sesqui-sulphide. As2s3. Orpiment.

A native sesqui-sulphide of Arsenic. It may be prepared by passing Sulphuretted Hydrogen through a solution of Arsenicum Album in dilute Hydrochloric Acid, and washing the precipitate thoroughly.

Characters and Tests. - A bright yellow powder, insoluble in Hydrochloric Acid, but soluble in Sulphide of Ammonium. Soluble in boiling dilute Nitric Acid, with separation of Sulphur.

Reference to Horn. Proving. - R. A. M. L., ii.

Preparation. - Trituration.