Cranberries. Fruit of Vaccinium macrocarpon Aiton. (Fam. Ericaceae.)—These familiar berries, so well known as an article of diet, have come into notice as a source of citric acid. For method, see J. P. C., 4e ser., xviii, 439. The leaves of the Vaccinium Vitis-idaea (L.) have been studied by Edo Claassen (A. J. P., 1886) and A. M. Karger (P. J., vol. lxx). They contain arbutin, hydroquinone, and tannin. Benzoic acid has also been recognized as normally present in small amounts. In the cranberry, Edo Claassen found an uncrystallizable glucoside, oxycoccin.