Tragacanth. Gum Tragacanth. Obtained from Astragalus Verus, and other species of Astragalus. Nat. Ord. Papilionaceae. Linn. Syst. Diadelphia De-candria. Source, Asia Minor. It contains two distinct gummy principles, Arabin (53 per cent.) and Bassorin, sometimes called Tragacanthine (47 per cent.).

Med. Prop. and Action. Demulcent. The best form for administration is that of the Compound Tragacanth Powder.

Offic. Prep. 1. Mucilago TragacanthAe (Tragacanth grs. c.; Boiling' Distilled Water fl. oz. x. Macerate for twenty-four hours, then triturate, and express through calico). Dose, fl. oz. j. - fl. oz. iij.

2. Pulvis Tragacanthae Compositus (Powdered Tragacanth Oz

j.; Powdered Gum Arabic oz. j.; Starch oz. j.; Refined Sugar in powder oz. iij.). Dose, gr. xx. - gr. lx.

Dose of powdered Tragacanth, gr. xx. - gr. lx., in the form of emulsion. Incompatible*. Acetate of Lead; Sulphate of Copper; Nitrate of Mercury; and Chloride of Tin.

2786. Therapeutic Uses

In the Cough of ordinary Catarrh, in that of Phthisis, 85c, the Pulv. Trag. Co. in emulsion with Syr. Papav. or T. Opii Camph., proves very useful in allaying the irritation. With Liq. PotassAe and T. Hyoscyam., it is very effectual in allaying Ardor Urin in Gonorrha. Combined with Ipecac. it also proves useful in Dysentery. Prof. Miller* advises the application of a thick semi-fluid aqueous solution of Gum Tragacanth to granulating surfaces, in order to protect them from the action of the air. It creates no irritation.