(From the Arabic term bedallah,) called also madelion bolchon, balchus, and by the Arabians mokel, is a gummy resinous juice, produced by a tree in the East Indies, of which we have no satisfactory account. It is brought to Europe both from the East Indies and Arabia in pieces of different sizes and figures, externally of a dark reddish brown, somewhat like myrrh; internally it is clear and not unlike glue. To the taste it is slightly bitterish and pungent; and its odour is very agreeable. If held in the mouth it soon becomes soft and tenacious, sticking to the teeth. Laid on a red hot iron it readily catches flame, and burns with a crackling noise; and, in proportion to its goodness, it is more or less fragrant.
Near half of its substance dissolves either in water or in spirit of wine; but the tincture made with spirit is somewhat stronger, and by much more agreeable. Vinegar, or verjuice, dissolves it wholly.
The simple gum is a better medicine than any preparation from it. It is one of the weakest of the deob-struent gums, but it is used as a pectoral and an em-menagogue. Applied externally, it is stimulant and promotes suppuration.