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Hydrogen sulfide can be produced commercially from sulfur and various hydrocarbons. At temperatures of 250°C.heavy fuel oils will react with sulfur to give high yields of hydrogen sulfide. At 600-650°C ., using various catalysts, sulfur will react quantitatively with methane and water vapor to form hydrogen sulfide and carbon dioxide.To prevent the formation of sulfur dioxide, the reaction can be carried out in two steps: (1) the reaction of sulfur with methane at 600-650°C. to form hydrogen sulfide and carbon disulfide, and (2) the conversion of the carbon disulfide at 300*-350°C. to hydrogen sulfide and carbon dioxide by means of water vapor.

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The method described herein is based on the fact first observed by Walden r that under certain conditions uranium salts produced a very marked increase in the specific rotation of Z-malic acid. Walden noticed that a similar but less marked effect is produced by uranium salts on^-tartaric acid, d-methyl tartrate, Z-quinic, and Z-mandelic acids, the increased rotation being in the same direction as the rotation of the aqueous solution of the substance. He concluded that the effect is limited to the active oxy-acids. As stated by Walden, the requisites of an agent which is to be used for the detection of malic acid by optical means are: (1) That the direction of rotation shall be constant, and (2) that the increase in rotation shall be as large as possible. This, of course, applies also to the quantitative estimation of malic acid. In addition, the agent in question should have little or no influence on any other substances which may occur in conjunction with malic acid. It has long been known that certain substances such as the oxygen compounds of boron 2 arsenic, antimony, molybdenum, and tungsten 3 have the power of increasing the specific rotation of the oxy-acids. Uranium salts, however, are the only ones which fulfill the requirements just stated with any degree of satisfaction. tion of Malic Acid and Its Application in Cane and Maple Products.'' 4 This paper was presented at the forty-second meeting of