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The apparatus for the low-pressure combustion method of determining carbon in iron and steel has been redesigned to increase the speed of manipulation. Several thousand determinations showed results in good agreement with Wooten and Guldner's form of the apparatus.A detailed description of the equipment and its manipulation is given, together withanaccountof experimental studies on the method. Results are also shown for the carbon content of copper. INDUSTRIAL AND ENGINEERING CHEMISTRY Vol. 16, No. 4 a. Sample pocket F. Electric furnace at 400°C. G. Palladium black on porous Alundum

SEPARATION OF THORIUM FROM URANIUM BY FERRONComplete precipitation of thorium can be obtained by the addition of 2.0 ml. of reagent per mg. of thorium in 1 ml. of solution. When uranium is present, however, it is difficult to determine the exact quantity of reagent necessary, as a colored uranium-ferron complex is formed also. If 25 ml. of reagent solution in excess of that necessary to produce the first permanent precipitate are added, the thorium can be completely precipitated.

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