"[Plin. Nat. 22.58.] - THE VARIOUS KINDS OF MEAL: TWENTY-EIGHT REMEDIES.
Barley-meal, raw or boiled, disperses, softens, or ripens gatherings and inflammatory tumours; and for other purposes a decoction of it is made in hydromel, or with dried figs. If required for pains in the liver, it must be boiled with oxycrate in wine. When it is a matter of doubt whether an abscess should be made to suppurate or be dispersed, it is a better plan to boil the meal in vinegar, or lees of vinegar, or else with a decoction of quinces or pears. For the bite of the millepede, it is employed with honey, and for the stings of serpents, and to prevent suppurations, with vinegar. To promote suppuration, it should be used with oxycrate, with the addition of Gallic resin. For gatherings, also, that have come to a head, and ulcers of long standing, it must be employed in combination with resin, and for indurations, with pigeons’ dung, dried figs, or ashes. For inflammation of the tendons, or of the intestines and sides, or for pains in the male organs and denudations of the bones, it is used with poppies, or melilote; and for scrofulous sores, it is used with pitch and oil, mixed with the urine of a youth who has not reached the years of puberty. It is employed also with fenugreek for tumours of the thoracic organs, and in fevers, with honey, or stale grease.
For suppurations, however, wheat-meal is much more soothing; it is applied topically also for affections of the sinews, mixed with the juice of henbane, and for the cure of freckles, with vinegar and honey. The meal of zea, from which, as already stated, an alica is made, appears to be more efficacious than that of barley even; but that of the three month kind is the most emollient. It is applied warm, in red wine, to the stings of scorpions, as also for affections of the trachea, and spitting of blood: for coughs, it is employed in combination with goat suet or butter.
he meal of fenugreek, however, is the most soothing of them all: boiled with wine and nitre, it heals running ulcers, eruptions on the body, and diseases of the feet and mamillæ. The meal of æra is more detergent than the other kinds, for inveterate ulcers and gangrenes: in combination with radishes, salt, and vinegar, it heals lichens, and with virgin sulphur, leprosy: for head-ache, it is applied to the forehead with goose-grease. Boiled in wine, with pigeons’ dung and linseed, it ripens inflamed tumours and scrofulous sores.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)

"[Plin. Nat. 22.77.] - DARNEL: FIVE REMEDIES.
Even more than this—the very plants which are the bane of the corn-field are not without their medicinal uses. Darnel has received from Virgil the epithet of “unhappy;” and yet, ground and boiled with vinegar, it is used as an application for the cure of impetigo, which is the more speedily effected the oftener the application is renewed. It is employed, also, with oxymel, for the cure of gout and other painful diseases. The following is the mode of treatment: for one sextarius of vinegar, two ounces of honey is the right proportion; three sextarii having been thus prepared, two sextarii of darnel meal are boiled down in it to a proper consistency, the mixture being applied warm to the part affected. This meal, too, is used for the extraction of splinters of broken bones.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)