the Water of the Thermal Spring of Baih. 61 



The liquid filtered off from the silicic acid (3.) was concen- 

 trated and precipitated by an excess of ammonia. 



II. 765-325 grms. of Mater gave 0-0078 grm., or O'OOlOl 

 per cent, of sesquioxide of iron. 



III. 732-015 grms. of water gave 0*0086 grm., or 0-00116 

 per cent, of sesquioxide of iron. 



Mean of the results, 0-00106 per cent., corresponding to 

 0*00153 per cent, of carbonate of oxide of iron. 



5. Estimation of Lime. 



The estimation of the lime was divided into — 



A. Estimation of the lime contained in the water in the 

 state of carbonate. 



B. Estimation of the lime contained in the water in the 

 state of sulphate. 



C. Estimation of the total amount of lime for control. 



A. Estimation of the lime combined with carbonic acid : — 

 The ammoniacal liquor filtered off from the precipitate of 



sesquioxide of iron was precipitated by oxalate of ammonia ; 

 the oxalate of lime was converted in the known way into 

 carbonate. 



I. 712-747 grms. of water gave, on boiling, a precipitate 

 containing 0*0904 grm. of carbonate of lime = 0-05062 grm., 

 or 0'00712 per cent, of lime. 



II. 623-881 grms. of water gave, on boiling, a precipitate 

 containing 0*0782 grm. of carbonate of lime = 0*0437 grm.j 

 or 0*00700 per cent, of lime. 



Mean of the results, O-OO7O6 per cent. 



B. Estimation of the lime combined with sulphuric acid: 

 The mineral water was kept boiling for one or two hours, 



replacing the water w^hich evaporated ; the precipitate formed 

 was filtered off, washed, and to the filtrate was added chlo- 

 ride of ammonium, ammonia, and oxalate of ammonia; the 

 oxalate of lime was converted into carbonate. 



I. 710747 grms. of water gave in this way 0*6072 grm. of 

 carbonate of lime = 0-3400 grm., or 0-04783 per cent, of lime. 



II. 623-881 grms. of water gave 0-5165 grm. of carbonate 

 of lime = 0-2892 grm., or 0*04635 per cent, of lime. 



Mean of the results, 0*04709 per cent. 



C. Estimation of the total amount of lime for control : — 

 The ammoniacal liquid which was filtered off from the pre- 

 cipitate of sesquioxide of iron was precipitated after the addi- 

 tion of chloride of ammonium by oxalate of ammonia, and the 

 oxalate of lime converted into carbonate. 



