tin compound to be used in medicine. It was made by first combining tin and mercury into an amalgam, and then distilling this substance with sulphur and sal ammoniac. It is now known to be a bisulphide of tin. The mercury only facilitates the combination of the tin and the sulphur, and the sal ammoniac has the effect of regularising the temperature in the process. The product is a beautiful golden metal of crystalline structure and brilliant lustre. It was given in doses of from 4 to 20 grains; was sudorific and purgative; and was recommended in fevers, hysterical complaints, and venereal disorders. The subsequent preparations of tin which came to be used principally as vermifuges were the Calx Jovis (the binoxide), the sal Jovis (sometimes the nitrate and sometimes the chloride), and the Amalgama Jovis. These, however, were all ultimately superseded by the simple powder of tin given either with chalk, sugar, crabs' eyes, or combined with honey or some conserve. The dose was very various with different practitioners. Some prescribed only a few grains, others gave up to a drachm, and Dr. Alston, an eminent Edinburgh physician in the eighteenth century, said its success depended on being administered in much larger doses. He recommended an ounce with 4 ounces of treacle to be given on an empty stomach. To be followed next day with 1/2 oz., and another 1/2 oz. the day after; the course to be wound up by a cathartic.
The Anti-hecticum Poterii was a combination of tin with iron and antimony, to which nitrate of potash was added. It was sudorific and was thought to be especially useful in the sweats of consumption and blood spitting. Flake's Anti-hæmorrhoidal Ointment was an amalgam of tin made into an ointment with rose oint-
