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)

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THE ELECTROLYTIC DETERMINATION OF nOLYBDENUM. BY LILY GAVIT KOLLOCK AND EDGAR F. SMITH. Recehed July 5. rgor ORE than twenty years ago Smith,' in describing his ex-M perience in the electrolysis of solutions of ammonium molybdate, wrote : l ' The deposition, although complete, was so very slow that this method of determination was practically of little value." During the last few months attention has again been given in this laboratory to the subject. Sodium molybdate (Na2Mo0,.2H,O) was dissolved so that 0.1302 gram of molybdenum trioxide was present in 125 cc. of solution, which was exposed for several hours to the action of a current of 0. I ampere and 4 volts. The temperature of the electrolyte was 75' C. No ~IOLYBDENUM-SULPHUR RATIO. UNIVERSITY OF PENNSYLVANIA. A COMPARISON O F THE SOLUBILITY OF ACETYLENE AND ETHYLENE.

The studies made by Hildebrand and more recently by McCutcheon with the form of cell pictured and described1 and in which the rotating silver anode and mercury cathode are employed, led us to try out certain lines of thought in the same way. For example,• it seemed worth the while to learn just what quantities of barium chloride, let us say, could be elec-

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THE purpose of the present communication is to call attention to the conditions under which uranium can be quantitatively determined in the electrolytic way in solutions of the acetate, the sulphate, and the nitrate, and also to record several separations of uranium by the same means from other metals. It is not necessary to comment further upon the form in which the uranium is precipitated or upon the way in which the deposit is subsequently treated in order to weigh it, as those points have