Mineral IVatcrs at Cheltenham. S7 



of potash, and the product heated to redness. Tlius the 

 presence of the obtauied carbonate of iron, of muriate oj^ 

 lime, and muriate of magnesia was established. 



Experiment XVI. — The aqueous fluin left in Experi- 

 ment IV. being concentrated, did not disturb the solution 

 of muriate of platina, nor was it rendered turbid by oxalate 

 of ammonia: it was therefore minaled with alcohol till no 

 more cloudiness ensued, evaporated till a strong pellicle ap- 

 peared, and the crystalline mass dried. The remaming 

 fluid was again evaporated and suffered to crystallize ; the 

 salt produced being muriate of soda, could not be obtained 

 free Irom sulphuric acid ; it was dissolved in water, toijcther 

 with that portion obtained in Exper. VIII., and then de- 

 composed by nitrate of silver. The precipitate produced 

 taking 233 grains of muririte of silver to be equal to 100 of 

 muriate of soda, indicated 219-75 muriate of soda in each 

 gallon of the water. 



Exfjerimrnt XVIt. — The fluid being completely freed 

 from muriate of soda was highly concentrated, and mingled 

 whilst hot with a solution of sub-carbonate of potash ; a 

 copious precipitate fell down, which, being thoroughly ig- 

 nited, indicated 9S'25 sulphate of magnesia in each gallon 

 of water, taking I3G'68 of magnesia to be equal to 100 of 

 sulphate of magnesia. 



Experiment XVIII. — The fluid left in the preceding ex- 

 periment was again evaporated, the sulpb#G of potash in- 

 troduced separated, by causing the whole to crystallize into 

 a solid mass, heating it slowly, and decanting the liquid 

 fulphate of sotia by adding a few drops of water. On re- 

 peating this operation for several times successively, the 

 sulphate of soda was obtained pure from the sulphate of 

 potash ; it amounted to SO'Ol in the gallon of water. 



Experiment XIX.-— The fluid left in Experiment V. was 

 rendered turbid by nitrate of barytcj and oxalate oi' ammonia, 

 which, together with its great insolubility, proved it to be 

 enlphate of lime ; it was decomposed by barytes water : the 

 solution (laking !00 parts of sulphate of barvtcs to be pro- 

 duced by 71 of sulphate of lime) indicated S.5'01 sulphate 

 pf lime to be contained in each gallon of the water. 



'J'be 



