Copaiba, 94; magnesia recently prepared, 6; mix and set aside till it concretes into a pilular mass. If it does not concrete in eight or ten hours, there is deficiency of water in the copaiba. This may be remedied in subsequent operations by shaking the copaiba with one-twentieth of its weight of water and decanting after the uncombined Water has subsided. The mass is divided while fresh into pills weighing 5 gr. (0.33 gm.} each.