i 30 Analysis of the Pittsburgh Mineral Spring. 



the whole of it, except half a grain of white powder, which 

 remained on the filter, and which not being soluble in dilute 

 marine acid was found to be gypsum or sulphate or lime. 



We have now three solutions which we shall examine in 

 the following order : — 



First — That which was taken up by the alcohol and con- 

 sisted of only half a grain. This could be only muriate of 

 lime or muriate of magnesia. Having converted it into an 

 aqueous solution by previous evaporation, and subsequent 

 dilution in a small quantity of distilled water, I found that it 

 was precipitated by pure ammonia, and shewed the pres- 

 ence of marine acid by the addition of nitrate of silver. 

 Thus we have decided the presence of muriate of magnesia, 

 half a grain. 



Second — It will be perceived that the distilled water had 

 taken up two grains of the residuum, from the solution in al- 

 cohol. To ascertain the properties of this, I evaporated this 

 aqueous solution over a lamp in a glass vessel. When the 

 evaporation was nearly finished saline cubic crystal appear- 

 ed, which on examination, were found to be wholly muriate 

 of soda, or common salt. 



The third and last solution in marine acid, which consis- 

 ted of one grain, was diluted with distilled water, and as I 

 had no reason to doubt it contained the whole of the iron 

 with which the water was impregnated, I added a few drops 

 of succinat of ammonia which immediately threw down a 

 brown precipitate. When the whole of it was precipitated 

 the solution was filtered, and after the residuum had been 

 exposed to a red heat it was weighed and examined, when it 

 was found to consist of one grain of oxide of iron. 



The Analysis of the Pittsburgh Mineral Spring having 

 been thus completed, I shall here recapitulate the whole of 

 its contents as it appeared to me from experiments, as fol- 

 lows : — 



Muriate of soda - - 2 



Muriate of magnesia - - - 1-2 



Oxide of iron - - , 1 



Sulphate of lime - - - 1-2 



Total 4 

 Quantity of carbonic acid gas in one quart of water eigh- 

 teen cubic inches. 



