Mr. Horner on the Brine Springs at Droltwlch. 105 



d. This residuum was dissolved in distilled water, and as it was 

 unnecessary to attempt to ascertain the proportions of muriate of. 

 lime and muriate of magnesia in so small a quantity, supposing 

 them both to be contained, all I could do was to determine the 

 existence of each. 



e. To one portion of this solution I added oxalate of ammonia, 

 Which produced no change. 



f. To another portion I added pure ammonia, which immediately 

 occasioned a flocculent precipitate. 



g. To a third portion I added neutral carbonate of ammonia 

 and phosphate of soda ; a precipitate was produced, and a rod 

 drawn along the glass left white streaks. 



The whole therefore of this residuum was muriate of magnesia, 

 with perhaps a minute quantity of muriate of soda. 



C. To estimate the Amoutit and Nature of the Sidphates. 



a. To three ounce measures of brine, weighing 1628.4 grs. 

 I added nitrate of barytes in excess. The precipitate was well 

 washed, dried over a lamp, and afterwards heated to redness in a 

 platina crucible. It weighed 22. grs. which is equal to 7.37 grs. 

 of acid, or 2.46 grs. in an ounce ; according to the proportions of 

 BerthoUet,* of SQ.5 acid and QQ.5 base in 100 parts of sulphate 

 of barytes. 



This acid might either be combined with lime, magnesia, or 

 soda, or with all the three. To determine what it was combined 

 with, I dissolved the salt which had been freed from the earthy 

 muriates by the process B. b- in distilled water, 



* Mcmoires d'Arcueil, vol. ii. 

 Vol. II. O 



