Bernard Courtois was awarded 6,000 francs by the Academy of Sciences in 1832, but he died in Paris in 1838 in poverty. He had been ruined in 1815 by the competition of East Indian saltpetre with the artificial nitre which he was manufacturing. In that year the prohibitive duty on the native product was removed. When the Academy awarded 6,000 francs to Courtois it also voted 3,000 francs to Coindet, who had so promptly made medical use of Courtois’ discovery. LITHIUM. Lithium, the oxide of which was discovered in 1807 by Arfwedson, was first suggested as a remedy for gout by Dr. Ure in 1843. He based his proposal on an observation by Lipowitz of the singular power of lithium in dissolving uric acid. Dr. Garrod popularised the employment of the carbonate of lithium in medicine. Most of the natural mineral waters which had acquired a reputation in gouty affections have been found to contain lithium. MAGNESIA. The first use of carbonate of magnesia medicinally was in the form of a secret medicine which must have acquired much popularity in the beginning of the eighteenth century. It was prepared, says Bergmann, by a regular canon at Rome, sold under the title of the powder of the Count of Palma, and credited with almost universal virtues. The method of preparation was rigidly concealed, but it evidently attracted the attention of chemists and physicians, for it appears that in 1707 Valentini published a process by which a similar product could be obtained from the mother liquor of “nitre” (soda) by calcination. In 1709 Slevogt obtained a powder exactly resembling it by precipitating magnesia from a solution of the sulphate by potash. Lancisi reported on it in 1717, and in 1722 Hoffmann went near to explaining the distinction between the several earthy salts, which in his time were all regarded as calcareous. Hoffmann’s process to obtain the powder was to add a solution of carbonate of potash to the mother liquor from which rough nitre had been obtained (solution of chloride of magnesium), and collect the precipitate. This being yielded by two clear solutions gave to the carbonate of magnesia precipitated the name of Miraculum Chemicum. Magnesia was the name of a district in Thessaly, and of two cities in Asia Minor. The Greek “magnesia lithos,” magnesian stone, has been frequently applied to the lodestone, but this can hardly have been correct, as the magnesian stone was described as white and shining like silver. Liddell and Scott think talc was more probably the substance. The alchemists sometimes mention a magnesia, but the name seems to have been a very elastic one with them. The Historical English Dictionary quotes the following reference to the word from “Norton Ord. Alch.,” 1477:--“Another stone you must have ... a stone glittering with perspicuitie ... the price of an ounce conveniently is Twenty Shillings. Her name is Magnetia. Few people her knows.”