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A new simple rapid method for the combustion of organic deuterium- containing compounds was worked out which makes possible the direct obtention of water. The water is sditable for isotopic analysis by the falling drop method without further purification. The decomposition products of silver permanganate at 500 deg C were used as oxidation catalysts and decomposition products of potassium permanganate at the same temperature were used for the quantitative absorption of nitrogen in the combustion chamber. By decreasing the dimensions of the combustion chamber, a contamination reduction was obtained. The thermostat, which maintains the temperature of the bath with sn sccuracy of plus or minus O.OO1 deg at a constant height, is described. (trauth)