tJie Water of the Thermal Spring of Bath. 



65 



Mean of the results. 

 0*48l7grm. of carbonic acid,which equals 0*02254 per cent. 



Total amount of carbonic acid . . 0-02254 

 Carbonic acid existing in combination — 



With oxide of iron . . . 0-00057 



With lime . . . . . 0-00554 



With magnesia .... 0-00024 



Sum total ...... 0-00635 



Free carbonic acid remaining 0*01619 



From the details contained in the preceding pages, it fol- 

 lows that the thermal spring in the King's Bath contains the 

 following constituents in 100 parts : — 



0-20620 

 Traces of manganese and iodine. 



Estimation of the total amount of the fixed ingredients in the 

 water for control. 



The water was concentrated in a porcelain dish, and after- 

 wards evaporated to dryness in a platinum basin. The resi- 

 due was heated in an air-bath until the weight was constant. 

 Two estimates were made. 



I. 217*058 grms. of water gave 0*4540 grm., or 0*20916 

 per cent, of residue. 



II. 319*57 grms. of water gave 0*6726 grm., or 0*21040 

 per cent, of residue. 



Mean of the results, 0*20978 per cent. 



But in this experiment the iron was obtained in the state 

 of sesquioxide, whilst in the preceding calculation it is taken 

 as the carbonate of the oxide, in which form it exists in the 

 water. 



On calculating the absolute weights from the above, we 

 obtain the following numbers : — 



Phil. Mag. S. 3. Vol. 3 1 . No. 205. Jidij 1 847. F 



