From the solution from which the Kermes had been deposited a further precipitate was obtained by the addition of hydrochloric acid. This, too, was a mixture, consisting of protosulphide and persulphide of antimony with some sulphur. It was the golden sulphuret which in association with calomel became so noted in the form of Plummer’s powder and Plummer’s pills. The powder was at first known as Plummer’s Æthiops Medicinalis. It would be tedious to go through the multitude of antimonial compounds which have become official, and it would be impossible in any reasonable space even to enumerate the quack medicines with an antimonial base which were so recklessly sold in this and other countries, especially in the earlier half of the seventeenth century. The most important of all the antimonial compounds, or, at least, the one which has maintained the favour of the medical profession in all countries, is, of course, the tartrate of antimony and potassium, emetic tartar. EMETIC TARTAR. Adrian Mynsicht, physician to the Duke of Mecklenburg in the early part of the seventeenth century, is generally credited with the invention of emetic tartar. Certainly the earliest known description of it is found in his “Thesaurus Medico-Chymicum,” published in 1631. But Hofer has pointed out that the mixture known as the Earl of Warwick’s Powder, which consisted of scammony, diaphoretic antimony (a binantimoniate of potash) and cream of tartar, which Cornachinus of Pisa described in 1620, was really its forerunner, and he considers that the salt was recognised in medicine before Mynsicht published his description. Glauber, in 1648, described the process of making Mynsicht’s emetic tartar from cream of tartar and argentine flowers of antimony. ANTIMONY CONTROVERSY.