228 Mr. Brande on the Analysis 



One wine pint contains 



Cubi(^ inches. 



Carbonic acid 11 



Nitrogen I 



Gaseous contents 12 



Grains. 



Carbonate of lime 2.20 



Carbonate of iron 2.40 



Carbonate of magnesia 2.10 



Muriate of magnesia 5.00 



Sea salt 7.00 



Sulphate of magnesia * 7.50 



Sulphate of soda 9.30 



Sulphate of lime 5. 



Aggregate weight of solid contents. . 40.50 



20. Besides the substances now enumerated, and which may be 

 considered as the most frequently occurring ingredients in mine- 

 ral waters, there are others occasionally present, of which the fol- 

 lowing is an enumeration,with the best methods of detecting them. 



a Carbonate of soda is known to exist in water, when after 

 having been boiled down to half its bulk, and, if necessary, fil- 

 tered, it reddens tumeric paper, and restores the blue of lit- 

 mus reddened by vinegar ; it also affords an effervescent pre- 

 cipitate with nitrate of baryta, soluble in dilute nitric acid. 

 This carbonate is incompatible with the soluble salts of lime. 



Muriate of lime may also be used to detect the alcaline car- 

 bonates, with which it affords a precipitate of carbonate of lime. 

 Carbonate of soda is distinguished from that of potassa, by the 

 latter affording a precipitate in neutral muriate of platinum, 

 which the former does not. Carbonate of ammonia is ob- 

 viously discoverable by its smell, when acted on by caustic 

 fixed alcali, or lime. 



b Silica is detected by evaporating the water to dryness, and 

 boiling the residue in dilute muriatic acid. The silica, if pre- 

 sent, remains as a white powder not altered by a red 

 heat, but instantly fusing with a particle of carbonate of soda= 



