This text presents a new method for determining nitrogen content in organic substances, developed by J. Kjeldahl. The method is simple, quick, and accurate, making it suitable for practical use in various fields such as agriculture and physiology. It involves heating the sample with concentrated sulfuric acid to dissolve organic matter, followed by oxidation with potassium permanganate to release nitrogen as sulfuric acid ammonia. This ammonia is then distilled and titrated to determine the nitrogen content. The method is efficient, requiring minimal skill and equipment, and is particularly useful for analyzing substances that are difficult to handle with traditional methods. The method has been tested on various organic materials, including plant and animal substances, and has shown good results, especially in cases where nitrogen is tightly bound. The method is also applicable to substances containing nitrogen in volatile forms, such as nitrate compounds. The new method offers significant time savings and is more practical than traditional methods, making it suitable for routine analysis in laboratories and industrial settings. The method was first presented at a chemistry conference in Copenhagen and is expected to be widely adopted for its efficiency and accuracy.This text presents a new method for determining nitrogen content in organic substances, developed by J. Kjeldahl. The method is simple, quick, and accurate, making it suitable for practical use in various fields such as agriculture and physiology. It involves heating the sample with concentrated sulfuric acid to dissolve organic matter, followed by oxidation with potassium permanganate to release nitrogen as sulfuric acid ammonia. This ammonia is then distilled and titrated to determine the nitrogen content. The method is efficient, requiring minimal skill and equipment, and is particularly useful for analyzing substances that are difficult to handle with traditional methods. The method has been tested on various organic materials, including plant and animal substances, and has shown good results, especially in cases where nitrogen is tightly bound. The method is also applicable to substances containing nitrogen in volatile forms, such as nitrate compounds. The new method offers significant time savings and is more practical than traditional methods, making it suitable for routine analysis in laboratories and industrial settings. The method was first presented at a chemistry conference in Copenhagen and is expected to be widely adopted for its efficiency and accuracy.