Abstract A new method has been developed to permit the rapid determination of nitrogen in organic compounds. The sample is decomposed with iodic acid-strong phosphoric acid reagent in a glass reaction vessel, and the liberated nitrogen is collected in an azotometer filled with potassium hydroxide solution by the flow of pure carbon dioxide. From the volume of the nitrogen thus collected the percentage of the nitrogen in the sample can be readily determined. This method is, so to speak, the wet modification of the Dumas method. For various types of compounds containing nitrogen, ammonium salts, amine, azo-compound, pyrrol, thiazole, etc., satisfactory results were obtained by means of this method. The nitrogen in a 10 to 50 mg. sample can be determined for thirty to forty minutes with a simple and inexpensive apparatus. But volatile compounds, nitro- or nitroso-compounds, compounds having purine, pyridine, quinoline, and other complicated rings, etc., can not give good results.