The author confirms the existence of atomic hydrogen in iron nitride: (1) By the presence of hydrogen when heating iron nitride above 430°C. at which iron nitride is found to decompose slowly. (2) By the measurement of the single potential of iron nitride in the normal ferrous sulphate solution. (3) By the oxidation of atomic hydrogen due to oxygen in the water in which iron nitride is immersed. (4) By the transformation of potassium ferricyanide into potassium ferrocyanide by atomic hydrogen occluded in iron nitride. By measuring the single potential of nitrided iron, he observed the change of compact iron into porous iron by nitriding. The influence of light on the single potential of iron nitride was tested and it was found that light produces no marked photo-chemical effect upon it.
Dehydrated Iaumontite sorbs ammonia but not carbon dioxide. The sorption amount of ammonia varies markedly by the conditions of the dehydration. Same amount of ammonia is sorbed at 25°C. and at 0°C. by a sample. The ammonia combines chemically with dehydrated mineral.