66 Analysis of the Water of the Thermal Spring of Bath. 



Carbonate of lime . . 

 Carbonate of magnesia . 

 Carbonate of oxide of iron 

 Sulphate of lime . . . 

 Sulphate of potassa . . 

 Sulphate of soda . . . 

 Chloride of sodium . . 

 Chloride of magnesium . 

 Silicic acid 



In a litre 



0-1260 grm. 



0-0047 



0-0153 



1-1436 



0-0663 



0-2747 



0'1806 



0-2083 



0-0426 



0-20621.. 



In an imperial gallon 



(70,000 grs.). 



8-82000 grs. 



0-32900 ... 



1-07100 ... 

 80-05200 ... 



4-64100 ... 

 19-22900 ... 

 12-64200 ... 

 14-58100 ... 



2-98200 ... 



144-01800 



According to our experiments, 1 litre of the water contains 

 95-64 cubic centimetres of free carbonic acid at the tempera- 

 ture of 46° C. (115° F.) and normal atmospheric pressure. 



One imperial gallon contains therefore 26-45 cubic inches 

 of free carbonic acid of 46° C, being more than double the 

 quantity which has been determined by former experiments. 



This however is not surprising, as the estimations previ- 

 ously made had been effected by the expulsion of the carbonic 

 acid from the water. Besides the difficulty of avoiding a loss 

 of carbonic acid before the operation, it is scarcely possible, 

 as Mr. Philli])s justly notices in his paper, to expel all carbonic 

 acid by simple ebullition. Besides, we see from the experi- 

 ments of Daubeny, that the gas which escapes from the well 

 contains at different periods highly varying amounts of car- 

 bonic acid. He found by several experiments that the King's 

 Bath evolves on an average 267 cubic inches of gas per minute, 

 or 223 cubic feet in twenty-four hours. He further ascer- 

 tained that this gas consists nearly entirely of nitrogen, mixed 

 with a small amount of oxygen and carbonic acid, and that 

 these gases were generally in the following proportion : — 



Nitrogen . . =91 '9 

 Oxygen . . . = 3-8 

 Carbonic acid = 4*3 



In many instances, however, he observed as much as 7 '4 

 to 8-2, and even once 11*5 parts of carbonic acid. 



From these observations there is no doubt that the quan- 

 tity of carbonic acid dissolved in the water is very variable. 



In the following Table we give the analyses of former ex- 

 perimenters, calculated in an imperial gallon (70,000 grs.). 



