108 Rev. Mr Robertson's Analysis of the Water 



also when the solution was previously neutralised by ammohia, 

 with tincture of galls, thus shewing that the small portion which 

 it still held, was in the state of a sulphate or muriate of the pro- 

 toxide. 



To ascertain the precise quantities, a pint of the water was con- 

 centrated by evaporation, and the precipitated carbonates being 

 carefully separated, were re-dissolved in nitric acid. 



To this solution, somewhat diluted, and exactly neutralised 

 by ammonia, oxalate of ammonia was added. The precipitate, 

 when converted into a sulphate as before, weighed one grain 

 and two-tenths, equivalent to .494 of a grain of lime. 



The liquid decanted off from the oxalate being now super- 

 saturated with ammonia, the iron subsided : it weighed about 

 .05 of a grain. 



The magnesia was thrown down by adding to the solution, 

 already supersaturated with ammonia, phosphate of soda. The 

 precipitate, after being heated to redness, weighed eleven 

 twentieths of a grain, equivalent to .20 of a grain of magnesia. 



To the liquid, from which the carbonates had been thrown 

 down by the boiling, a little oxalate of ammonia was added. 

 The oxalate of lime precipitated weighed about one-fortieth of a 

 grain, equivalent to .011 of a grain of lime. 



The magnesia was then precipitated by aqua-ammoniae and 

 phosphate of soda. The precipitate, after being heated to redness, 

 weighed eleven-fortieths of a grain, equivalent to .10 of a grain 

 of magnesia. 



STATEMENT OF THE PRECEDING ANALYSES. 



Gas ascending through the water. 



Nitrogen, ..... .900 



Oxygen, ..... .085 



Carburetted hydrogen, (uncertain), . . ,015 



1.000 



1 



