The catalytic decomposition of hydrogen peroxide by iron salts

[ Note by Dr. O. H. Wansbrough-Jones —Shortly before Professor Haber died, he gave the manuscript of this paper to Professor Sir William Pope. The final revision for the press had not been made and in its original from the paper was not suitable for publication in an English journal. Considerable alterations in the wording have accordingly been made; but since, Professor Haber had considered carefully how he wished to present the results embodied in it, the form and sequence of the paper remain unmodified. The paper is, further, a sequel to some communications in German periodicals which may not be familiar to its readers. In an attempt to make it more quickly understandable, while keeping it as far as possible as it was left by Professor Haber, the following summary has been added.