A white sweet juice, which oozes from the trunk, branches, and leaves, of several kinds of trees; but the ash, the larch, and the alhagi afford it in the largest quantities. Sicily and Calabria, are the countries from whence it is chiefly obtained; where it flows naturally from the ash, and attaches itself to its sides in the form of white transparent drops; but the extraction of this juice is facilitated by incisions made in the tree during summer. Its smell is strong, and its taste sweetish, and slightly nauseous. Water dissolves it, hot or cold. If it be boiled with lime, clarified with white of egg, and concentrated by evaporation, it affords crystals of sugar. This substance forms the basis of many purgative medicines.