II. On larixinic acid, a crystallizable volatile principle found in the bark of the larch tree (pinus larix linn.)

This acid is prepared by digesting larch-bark in water at 80° C., evaporating the infusion at the same temperature to the consistence of syrup, and distilling it in vessels of glass, porcelain, or silver ;i. e . of a material not liable to be attacked by the acetic acid present in the infusion. The larixinic acid distils over, and partly crystallizes on the inner surface of the receiver, but chiefly remains dissolved in the distilled liquid, which, after being concentrated by cautious evaporation, deposits the impure acid in form of crystals.