PAPERS ON CHEMISTRY AND PHYSICS 283 



urinations. The content of total organic carbon and of 

 calcium are included also in the tables. For the sake of 

 convenience in studying the relative values obtained, the 

 soil numbers are arranged in order of increasing values 

 as determined by the Hopkins method. 



The results are graphically expressed in Figs. 1 to 5, 

 inclusive. 



