Marrubium

(mar-u’-be-um) [L.]. Horehound The leaves and tops of M. vulgare, of the order Labiatse. It contains a volatile oil, a bitter principle, marrubin, tannin, resin, and lignin. At present horehound is mainly employed in catarrhal affections of the respiratorv tract. Dose 55s— j (2.0-4.0). Unof. Marsh-fever. Malaria Marsh-gas. Methane. Marsh-mallow. See Aithaa. Marsh’s Test. A test for arsenic. Hydrogen is generated by the action of an acid on zinc, the suspected liquid is added, and if arsenic is present, it combines with the hydrogen to form arsine, AsHs, which may be ignited at the end of the delivery-tube and the flame allowed to impinge against cold porcelain. Metallic arsenic is deposited and is recognized by the character of the stain and chemic tests. Martin’s Bandages. India-rubber bandages, from 5 to 21 feet in length, used for making compre ion of a limb for the cure of ulcers, varicose veins, etc. Maruta ‘.:-■<-:<’-tah) [L.]. A genus of herbs of the order Composite. M. cotula, may-weed, or dog-fennel, is used as a substitute for chamomile. 380