174 
of the Nitrates collected and estimated by Nessler Solution, and 
the Nitric Acid calculated accordingly. 
The Ammonia, 1:04 parts per million, was found by distilling 
3 a litre of the water with a little pure Carbonate of Soda and then 
determining the amount with Nessler Solution. I should add that 
the waters gave a yellow precipitate simply on the addition of the 
before-mentioned Solution. 
For the determination of the Alkaline earths, half the filtrate 
from the Ferric oxide was taken, Chloride of Ammonia having been 
added to keep the Magnesium in Solution. The Calcium was 
thrown down with oxalate of Ammonia, ignited till all the carbonic 
acid was driven off and weighed as lime. Afterwards, when ex- 
amined with the spectroscope, the characteristic lines of Strontium 
were observed. The Magnesium was then precipitated with 
Phosphate of Soda in excess, allowed to stand 12 hours, and filtered, 
‘after careful washing was dried and ignited ; the residue being 
weighed as Pyro-phosphate of Magnesium, and the amount of 
Magnesium calculated accordingly. 
The Potassium and Sodium :—For this purpose 3 a litre of the 
water was taken. The Magnesium and Calcium separated with 
pure Hydrate of Lime and Oxalate of Ammonia, the usual 
precautions being taken and the Potassium estimated with Pt. Cl* 
(Chloride of Platinum) as recommended by Fresenius, the Sodium 
afterwards determined by difference. The residue was here 
examined spectroscopically, when the beautiful red line of Lithium 
shone out at once. 
The foregoing is an outline of the Laboratory operations. 
With regard to the estimation of the Iron, Silica, Alkaline earth 
‘and Alkalies I have followed the system of Fresenius ; for the 
Nitric Acid, Ammonia and solid residue, Professors Wanklyn and 
Chapman are my authority ; while for the volumetric processes I 
have adhered to the plan laid down in Mr. Sutton’s work. 
Here is a paper showing the analysis of the mineral water we 
are discussing and that of the King’s Bath. I have placed them 
