Characters. - Transparent garnet-red scales, permanent in the air, odourless, having a very faint ferruginous taste and an acid reaction.

Solubility. - Slowly but completely soluble in cold water and readily so in boiling water; insoluble in alcohol.

Reactions. - Vide supra.

Preparation.

Ferri Quininae Citras.

Use. - Is pleasant. A solution of 240 grains in 1 fl. oz. of water keeps perfectly, and may be given in doses of 10 minims, equal to 5 grains, as a tonic.