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N 1884 while'engaged in studying the metallurgy of iridium I from a commercial standpoint, I made many experiments in order to obtain a satisfactory bath for the electro-deposition of the metal. From a practical standpoint many difficulties were encountered, while experimentally most solutions of iridium yield the metal very readily under the influence of the electric current. Much experimenting was done with the hope that a method might be devised by which a solution of the metal could be obtained electrolytically, thus avoiding the tedious and expensive processes for dissolving the platinum metals, but without success. AI any electrolytes were employed under all conceivable conditions with iridium anodes in various forms, especially plates made by fusing iridium with phosphorus, hut nothing practical was obtained. The iridium solutions were therefore made by several of the well known methods. The next problem to be solved was to keep the solution of constant metallic strength and purity. Every electro-metallurgist knows that a plating bath must remain constant in composition, and that the slightest change in any particular will impair its BY WM. 1. DTJDLEY.

THE ELECTRO-DEPOSITION OF IRIDIUM; A METHOD OF MAINTAINING THE UNIFORM COMPOSITION OF AN ELECTROPLATING BATH WITHOUT THE USE OF AN ANODE.