121 
Sulphuric acid was determined by the usual gravimetric 
process. 
Potash was weighed as potassium plato-chloride, the 
platinum being added after the sulphuric acid had been 
separated by baryta water, the baryta with milk of lime, and 
the lime with ammonium carbonate and a little oxalate. 
Magnesia was determined and weighed as magnesium 
pyrophosphate. 
The free carbonic dioxide and that in combination with 
ammonia were estimated together by boiling 200 c.c. of the 
water in a flask and passing the distillate through a re- 
frigerating apparatus and directly into a solution of barium 
chloride and ammonia, the resulting precipitate of barium 
carbonate was washed, dried, gently ignited, and weighed. 
The total quantity of carbonic acid in the water was 
determined by treating 50 c.c. of the sample with an am- 
monia solution of barium chloride, and drying the resulting 
precipitate of barium sulphate and carbonate, placing it in 
a carbonic^acid apparatus, and expelling the carbonic dioxide 
by means of sulphuric acid, and determining its amount 
by loss. 
I may say that each result herein given was repeated two, 
three, or more times, so as to leave little or no doubt as to 
its accuracy. 
The following gives the results of this analysis : — 
