570 



Journal of Agricultural Research 



Vol. X, No. II 



\vith water until free from hydrochloric acid, and was dried in the sun. 

 Samples of the untreated, hydrochloric-acid-treated, and acetic-acid- 

 treated soil were treated as outlined in the following tables. A saturated 

 solution of calcium bicarbonate in solution with carbon dioxid was added 

 to the soil at the rate of 0.4 per cent, on the basis of dry soil. An equiva- 

 lent amount of calcium carbonate was added to another sample, and these 

 were run with controls in comparison with other salts of calcium: (i) 

 With no sodium salt present, (2) with 10 per cent of sodium nitrate, 

 (3) with 10 per cent of sodium chlorid, and (4) with 10 per cent of sodium 

 sulphate. These results are outlined in Tables XXXIII, XXXIV, 

 XXXV, and XXXVI. 



Table XXXIII. — Solubility of organic matter and calcium carbonate, with no sodium 



salt added 



Table XXXIV. — Solubility of organic matter and calcium carbonate in 10 per cent solu- 

 tions of sodium nitrate 



