of two ?iot Mineral Springs in India. 99 



drogen, which, from the presence of pure soda, could not escape 

 as gas, may have acted on the iron, and have subsided as sul- 

 phuret of iron prior to the water being evaporated. It is pos- 

 sible also that Mr Breton may have been deceived, especially 

 as he is disposed to attribute the high temperature of the spring 

 to the oxidation of metallic sulphurets. This is the more pro- 

 bable, as he states that the water did not yield a precipitate, or 

 undergo any change with the nitrates of silver and bismuth. 



The analysis of the solid contents of the hot spring near 

 Loorgootha, agrees so closely with that just described, that it is 

 unnecessary to state it. The distance of Pinnarkoon from 

 Loorgootha is not mentioned by Mr Breton; but as the hot 

 springs which flow there are so analogous, even in the propor- 

 tion of their ingredients, their origin must doubtless be similar, 

 if not identical. 



The society will perceive from the preceding analysis, that 

 the hot springs of Pinnarkoon and Loorgootha belong to that 

 kind of mineral waters which contain siliceous earth, and of 

 which the boiling springs of the Geyser and Rykum in Ice- 

 land have I believe hitherto afforded the only examples. Ac- 

 cording to the analysis of Dr Black, * one gallon of the Geyser 

 water contains 62.85 grains, and an equal quantity of the Ry- 

 kum water 49.61 grains of solid matter. The residue is thus 

 composed. 



62.85 49.63 



The siliceous springs of Iceland are hotter, richer in solid 

 matter, and abound more in siliceous earth, and proportionally 

 less in pure soda, than the hot springs of Pinnarkoon and Loor- 

 gootha. In all of them the silica doubtless owes its presence to 

 the solvent powers of the soda. The carbonic acid reported in 

 my analysis, in all probability did not exist in the original spring, 

 but was absorbed from the atmosphere during the evaporation. 

 Philosophical Transactions of Edinburgh, iii. 95. 



