Dec. 1S7I919 



Oxidation of Sulphur in Soils 



339 



the end of 34 days the sulphate was again determined in the same 

 manner. In all experiments the barium sulphate was treated with 

 hydrofluoric acid and reprecipitated from sulphuric acid to purify the 

 precipitate. The results are given in Table XIII. 



Table XIII. — Percentage of sulphate sulphur in air-dry Kentucky soils 



