ICAL ANALYSIS. THE USE OF AMERCURY CATHODE IN ELECTROCHEM-BY EDGAR F. SMITH.Received J u n e 26, 1~03.THE suggestion of precipitating metals in the form of amalgams was first made (181%) by Wolcott Gibbs,l who described a new scheme for the electrolytic determination of metals, before the National Academy of Sciences, in which scheme he recommended weighing out in a small beaker a definite amount of metallic mercury which was, by means of a platinum wire, connected with a battery and made the cathode, while in the salt solution, contained in the beaker, was suspended a strip of platinum, serving as the anode. The currents used varied greatly in strength. Salts of mercury, tin and cobalt were apparently decomposed, their respective metals being precipitated upon or in the mercury cathode. QuantitatiGe results do not appear. The author of this method believed that possibly sodium and potassium might be separated in this manner and Professor H u n t remarked that the "process came with the beauty and force of a revelation."

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From the first crystallization, 8. 5 kilograms. From the second crystallization, 3. 4 kilograms. From the third crystallization, 2. z kilograms. From the fourth crystallization, I 5 kilograms (crystals A)

The deposit of metal was in each instance beautiful, light gray in color, metallic, and perfectly adherent. The arsenic existed in the solution as a sulpharsenate = (0.2000 gram of arsenic). Universityof Pennsylvania.[Contribution from the John Harrison Laboratory of Chemistry, No. 99.] THE USE OF THE ROTATING ANODE AND MERCURY CATHODE IN ELECTRO-ANALYSIS.

Stannous chloride found. Stannous chloride theory. Gram. Gram.