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 suggestion of its medicinal value:—One drachm of fine gold was dissolved in 2 ounces of aqua regia. To the solution 1 ounce of essential oil of rosemary was added, and the mixture well shaken. The yellow colour of the acid solution was transferred to the oil, which was decanted off, and diluted with 5 ounces of spirit of wine. The mixture was digested for a month, and then acquired a purple colour. Lewis explains that the oil takes up some of the gold, which, however, is deposited on the sides of the glass, or floats on the surface in the form of a slight film.

was described in the works attributed to Basil Valentine, and later by Oswald Crollius. It is sometimes termed Volatile Gold. Valentine explains very clearly the process of making it, that is, by dissolving gold leaf in aqua regia and precipitating the fulminating gold by salt of tartar. By treatment with vinegar or sulphur its explosive properties were to be reduced. It was supposed to possess the medicinal value of gold in a special degree, and was particularly recommended as a diaphoretic. It appears from reports that it occasioned violent diarrhœas, and was, no doubt, often fatal. The so-called Mosaic Gold, which was given as a remedy for convulsions in children, was an amalgam of mercury with tin, ground with sulphur and sal ammoniac.

Hahnemann insisted that gold had great curative powers, and several homœopathic physicians of our time have highly extolled it Dr. J. C. Burnett, in "Gold as a Remedy," recommended triturations of gold leaf, one in a million, as a marvellous heart tonic, especially in cases of difficult breathing in old age.