abundant supply of brackish water was obtained which stood f 

 depth of 15 or 16 feet from the surface. The analysis shews t 

 it was about equal to a mixture of 10 parts of fresh- water wit 

 part of sea-water, the numbers being — 



Sulphate of Calcium ... .\. 3-94 grs. per gin. 



Sulphate of Magnesium ... 1'51 „ 



Chloride of Magnesium ... 28-84 „ 



Chloride of Sodium 223-91 



Sulphate of Calcium 3-46 



Carbonate of Calcium ... 2-.50 



Carbonate of Magnesium . . . traces 



Chloride of Sodium 81-08 



Carbonate of Sodium 49-35 



Nitrite of Sodium ... ... 3-21 „ 



144-50 



solution and is alkaline, there is nothing to account for its action 

 on iron except the presence of nitrite of sodium. Nitrites have 

 been found to act injuriously on boiler plates, and it seems probable 

 that their oxidation to nitrates by a little permanganate or then 

 reduction to ammonia by passing through a hlter bed of granulated 

 zinc coated with copper would be beneficial. 



In conclusion I may add the analysis of salt deposited from a 

 spring at Queanbeyan : — 



Water 18-26 



Sulphate of Potassium 

 Sulphate of Sodium ... 

 Sulphate of Magnesium 

 Sulphate of Calcium ... 



Mr. C. :VroouE— 1 presume the results of the testing of water 

 depend a good deal upon circumstances. For instance I recollect 

 some twenty-three years ago a well where tlie men got water, and 



