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 *vestigations, while supporting the original opinion to a great extent as to the assimilability of the reduced iron, established that the product is not and cannot be pure. Dusart showed in 1884 that the proportion of actual iron could not exceed 87 per cent., and was not likely to be more than 84 per cent. Oxides, and carbonates of iron were inevitable, while sulphur, arsenic, phosphorus, and silicon were probable contaminations from the gas.

Citrate of Iron in scales was introduced by Beral, of Paris, in 1831. His formula is given in the ''Pharm. Jnl.'', vol. I, p. 594. Syrup of Phosphate of Iron was introduced in a paper read to the Medical Society of London in 1851 by Dr. Routh, and Mr. Greenish subsequently described to the Pharmaceutical Society the process by which it was prepared. The formula was afterwards improved by Mr. Gale, and his process was adopted in the B.P. It has since been modified. A solution of iodide of iron was first employed in medicine in this country by Dr. A. T. Thomson some time in the '30's of the nineteenth century. It was introduced into the London and Edinburgh Pharmacopœias in the form of a solid salt, and in the latter also in the form of a solution. Neither of those preparations could be preserved from decomposition, and the first suggestion of a syrup appears to have been made in Buchner's Repertorium in 1839, and soon after by other experimenters. Dr. Thomson gave a formula for a syrup of iodide of iron to one of the earliest meetings of the Pharmaceutical Society in 1841, reported in the first volume of the ''Pharm. Jnl.''