At Matsuzaki, Togo and Asozu Hot Springs and at Hamamura and Kachimi Hot Springs, the amounts of chloride and sulfate fixed to soil were determined with samples which were colleted from various parts of the thermal spring zone and its outside area, more than ten days after rainfall, so as to eliminate its possible effect. The amounts of sulfate were determined by terbidimetry with BaCl(2) solution and those of chloride were determined by　mercuric thiocyanate method. In the average amounts of chloride and sulfate, no differences were found between the samples collected from the thermal spring zone and its　outside area. The same fact was described in the 5th and 8th reports, but errorneously ascribed to an effect of rainfall. From the present study it has been ascertained that the fact is independent of rainfall.