C. 0. T. M0RI8ON 



1(>3 



suggested by A. Amos^ A tube containing silver sulphate was inserted 

 betbre the absorption Reiset, to prevent the hydrogen sulphide given off 

 interfering with the result. 



The figures for the percentage of calcium carbonate in the four 

 slags are: 



Thus in the four slags examined, which are believed to be typical 

 ones, the percentage of lime present both as carbonate and oxide does 

 not exceed 7^ "/o- 



Table I. 



It seemed to be a point of interest to determine what influence this 

 amount of free lime had on the action of the solvents employed for 

 determining the soluble phosphoric acid, and whether it was correlated 

 in any way with the amount of the latter. A solution of carbon dioxide 

 was the first solvent employed, and five consecutive extractions were 

 made with this on each slag. 



' Journal Agric. Science, Vol. i. part 3. 



11—3 



