554 



Journal of Agricultural Research 



Vol. X, No. II 



Table XIII. — Titrations with nitric acid of the sodium nitrate-calcium carbonate 



solution 



Table XIV. 



-Titrations with hydrochloric acid of the sodium chlorid-calcium carbonate 

 solutions 



Table XV. — Titrations with sulphuric acid of the sodium sulphate-calcium carbonate 



solutions 



In the soil, under field conditions, in the presence of carbon dioxid the 

 greater part of the sodium carbonate would take up carbon dioxid and 

 form sodium bicarbonate Na.COs + CO. +H20^2NaHC03. The three 

 systems described above were run, and carbon dioxid in solution was used 



