When the bark of the main stems is wounded, a gum will exude, and may be collected: it possesses astringent and mildly aperient properties. This was at one time included as a medicine in the Edinburgh _Pharmacopoeia_, but it has now fallen out of such authoritative use. Its chemical principle is "hederin." The gum is anti-spasmodic, and promotes the monthly flow of women. An infusion of the berries will relieve rheumatism, and a decoction of the leaves applied externally will destroy vermin in the heads of children. Fresh Ivy leaves will afford signal relief to corns when they shoot, and are painful. Good John Wesley, who dabbled in "domestic medicine," and with much sagacity of observation, taught that having bathed the feet, and cut the corns, and having mashed some fresh Ivy leaves, these are to be applied: then by repeating the remedial process for fifteen days the corns will be cured. During the Great Plague of London, Ivy berries were given with some success as possessing antiseptic virtues, and to induce perspiration, thus effecting a remission of the symptoms. Cups made from Ivywood have been employed from which to drink for disorders of the spleen, and for whooping cough, their method of use being to be kept refilled from time to time with water (cold or hot), which the patient is to constantly sip. Ivy gum dissolved in vinegar is a good filling for a hollow tooth which is causing neuralgic toothache: and an infusion of the leaves made with cold water, will, after standing for twenty-four hours, relieve sore and smarting eyes if used rather frequently as a lotion. A decoction of the leaves and berries will mitigate a [283] severe headache, such as that which follows hard drinking over night. And it may have come about that from some rude acquaintance with this fact the bacchanals adopted goblets carved out of Ivywood. This plant is especially hardy, and suffers but little from the smoke and the vitiated air of a manufacturing town. Chemically, such medicinal principles as the Ivy possesses depend on the special balsamic resin contained in its leaves and stems; as well as on its particular gum. Bibulous old Bacchus was always represented in classic sculpture with a wreath of Ivy round his laughing brows; and it has been said that if the foreheads of those whose potations run deep were bound with frontlets of Ivy the nemesis of headache would be prevented thereby. But legendary lore teaches rather that the infant Bacchus was an object of vengeance to Juno, and that the nymphs of Nisa concealed him from her wrath, with trails of Ivy as he lay in his cradle.