CHAP. 20. (11.)—NINE KINDS OF GUM. THE SARCOCOLLA.
It is universally agreed, that the best gum is that produced from the Egyptian thorn;[860] it is of variegated appearance, of azure colour, clean, free from all admixture of bark, and adheres to the teeth; the price at which it sells is three denarii per pound. That produced from the bitter almond-tree and the cherry[861] is of an inferior kind, and that which is gathered from the plum-tree is the worst of all. The vine, too, produces a gum,[862] which is of the greatest utility in healing the sores of children; while that which is sometimes found on the olive-tree[863] is used for the tooth-ache. Gum is also found on the elm[864] upon Mount Corycus in Cilicia, and upon the juniper,[865] but it is good for nothing; indeed, the gum of the elm found there is apt to breed gnats. From the sarcocolla[866] also—such is the name of a certain tree—a gum exudes that is remarkably useful to painters[867] and medical men; it is similar to incense dust in appearance, and for those purposes the white kind is preferable to the red. The price of it is the same as that mentioned above.[868]