On Medicine (De Medicina), Vol. 2

(5) Lapis Phrygius; rock alum from Phrygia and Cappadocia coloured by iron and copper sulphates; an exedent, II. 8; in an eye salve, 218.

(6) Alum earths; terra Eretria, II. 10, 180; terra Cimolia, glutinous hydrated silicate of aluminium coloured by iron and copper, I. 212, 304; II. 4, 102, 124, 184, 534; terra Melia, silicate of aluminium (alumen Melinum Melian alum), II. 2, 288; cf. Pliny, N.H. Natural History, xxxv. 188. 87, also Hippocrates, Ulcers, 11, 12 (Littré VI. 412, 414); terra Lemnia, silicates and sulphates of aluminium, magnesia and iron; the well known rubrica Lemnica Lemnian red earth, red ochre, was exported in packets stamped with the figure of a goat, as the colour due to oxide of iron was ascribed to an admixture of goat’s blood; similarly terra Samia, alum earth from Samos, was exported with a star stamped on it, II. 204 note.

Alvum ducunt, medicamenta quae medicines which move the bowels; purgatives and enemas, I. 62, 168, 172, 208; II. 10; see below Purgatio and General Index Clyster, Enema.

Amaracus; Origanum majorana, sweet marjoram. Used as a discutient agent that disperses swellings, II. 10.

Ambrosia; name of an antidote (so called from its success in preserving life), II. 54.

Ammoniacum (Hammoniacum) thymiatum; Dorema ammoniacum or Ferula Tingitana, silphium.
The milky juice of this plant (specially cultivated around the temple of Jupiter Ammon) was used for incense; it formed a resin containing salicylic acid and a volatile oil which was much used by Celsus, as a cleanser of wounds, II. 6, and a discutient and emollient, II. 16–30, and in