(1) The catalytic activity of Japanese acid earth on naphthalene has been compared with its adsorptive powers for water, benzene, and naphthalene. (2) The relations between the adsorptive powers and the surface area of the earth have been discussed. (3) It has been concluded that the larger the surface area the greater is the catalytic activity and therefore the magnitude of the catalytic activity depends upon the surface area possessing active centres equally distributed but not on the number of the active centres on the equal surface area. (4) The influence of the chemical composition of the earth on its surface area has been suggested.
The chemical reactions under the silent electric discharge were studied when hydrogen reacted with the following inorganic solid substances. (1) Potassium thiocyanate. Reaction products: hydrogen cyanide, hydrogen sulphide, and potassium sulphide. (2) Potassium silver cyanide. Reaction products: silver and hydrogen cyanide. (3) Calcium thiocyanate. Reaction products: hydrogen cyanide,hydrogen sulphide, and calcium hydroxide. (4) Ammonium thiocyanate. Reaction products: hydrogen cyanide, ammonia, and hydrogen sulphide. (5) Sodium thiosulphate. Reaction products: sodium sulphite, hydrogen sulphide, and sulphur. (6) Magnesium thiosulphate. Reaction products: Magnesium sulphite, hydrogen sulphide, and sulphur. (7) Barium thiosulphate. Reaction products: Barium sulphite, barium sulphide, hydrogen sulphide, and sulphur. (8) Barium chlorate. Reaction products: barium chloride and water. The writer wishes to express his appreciation of a grant from the Imperial Academy towards the expenses of this research.