MINERAL WATERS OF DUNBLANE. 455 



eessary, therefore, that in every case, the quantity of lime 

 should be found in the oxalate that is operated on. The above 

 quantity of 21 grains was converted by calcination into carbo- 

 nate of lime, and this being decomposed by muriatic acid, the 

 quantity of muriate of lime obtained, dried at a low red heat, 

 and weighed while warm, amounted to 18.3 graina. 



The liquor poured off from the precipitate, was evaporated 

 to dryness ; and to expel the muriate of ammonia formed by 

 the action of the oxalate of ammonia on the muriate of lime r 

 the heat was continued while any vapours were disengaged, 

 and at the end was raised nearly to redness. The dry mass 

 weighed, while warm, 25 grains. Being dissolved in water, its 

 solution was rendered very slightly turbid by the addition of 

 muriate of barytes, shewing the presence of a minute portion of 

 sulphuric acid. A quantity of precipitate was collected, which, 

 when dried, weighed 0.8 grain. Supposing the sulphuric acid 

 of this to have originally existed in the water, along with the 

 other portion of this acid, in the state of sulphate of lime, it 

 gives a proportion of that sulphate of 0.5 grain, and of course 

 increases the quantity of it from the 2.6 grains obtained by 

 evaporation to 3.1 grains. An equivalent quantity must at the 

 same time be subtracted from the proportion of muriate of 

 lime, which may therefore be reduced to 18 grains. By eva- 

 poration of the liquor, muriate of soda was obtained, weighing, 

 when it had been dried at a low red heat 24.3 grains. Of this 

 a small portion (0.4) would be formed by the muriate of ba- 

 rytes, which requires to be deducted ', but then the sulphuric 

 acid which existed in the mass, could, after the action of the 

 oxalate of ammonia, and the exposure to a red heat, exist in it 

 only in the state of sulphate of soda, in the production of which 

 an equivalent portion of muriate of soda would be decompo- 

 sed. The quantity of muriate of soda obtained, therefore, by 



3 M 2 the 



