THE "liver of sulphur" of the shops and of the British and United States pharmacopoeias, is a sulphuret of potassium, or a potassic sulphide, being prepared with potash and not with lime. It should never be used to prepare the drug known in the homoeopathic pharmacopoeia as Hepar sulphuris. It was discovered, in the course of experiments, that it produces solubility of sulphur. It is prepared by fusion ; sulphur one part and carbonate of potash four parts. It is used to resolve exudations, as in swollen glands, etc. ; it is also used in obstinate skin diseases, and in the preparation of sulphur baths. (Balneum sulphura- tum of Raye.) Care must be taken if an acid is added, because then sulphuretted hydrogen is evolved, and there is danger of asphyxia. Dupuytren added glue to the bath, and made the Balneum sulphuratum et gelatinosum. Hahnemann prepared Hepar sulphuris as follows: " Equal weights of the interior of the oyster- shell and pure sulphur flowers which have been well HEPAR SULPHURIS CALCAREUM. 28 1 washed and dried; mix well, and place in a well- heated porcelain crucible ; cover and keep at a white heat for ten minutes. When cold, open the crucible and preserve in well-stoppered bottles." It is prepared for use by trituration up to the third centesimal or higher. Some physicians use the third only of Hepar sulphuris who use higher potencies of other drugs. SPECIAL ANALYSIS. Sensorium. Vertigo when shaking the head or from jarring, as, for example, from driving in a wagon, so that on getting out one cannot stand alone. Sometimes faintness accompanies it.