WATER FROM LAKE CORAN.GAMITE. 271 



water was somewhat turbid when shaken, but tlie soHd 

 matter readily settled. Specific gravity of the water M^as 

 1035. For the analysis the water was filtered, and the 

 filtrate was clear and colourless. The reaction to litmus was 

 distinctly alkaline. The quantitative examination of the 

 water was made according to tiie methods described by 

 Dittmar for the analysis of sea water. 



The following is the result of the analysis : — 



Calcium 0-063 parts per 1000 



Mao^nesium 1-272 „ „ 



Potassium 0-387 „ „ 



Sodium 16-14.5 „ ,, 



Sulphuric acid (SO 4) 0*758 „ „ 



Chlorine 27-312 „ „ 



Bromine 0-102 „ „ 



Sulphydric acid — 



Carbonic acid — 



Total bases as Sulphates 57-276 „ „ 



The suljjhuretted hydrogen and carbonic acid which were 

 present in the water were not estimated, as, owang to the 

 time which elapsed between the collection and examination 

 of the sample, it was thought that the results would be of 

 but little value. 



The Examination for the rare Alkalies. — Four litres of 

 the water acidified with hydrochloric acid were concentrated 

 down in a porcelain basin. The crystals were collected 

 fractionally and filtered hot in a steamer. They were 

 allowed to cool slightly after the mother liquor had run 

 through and again put in the steamer. In this way the 

 crystals were more thoroughly and evenly washed than was 

 possible by any other method. A mother-liquor of about 

 10 c.c. was finally obtained. 



The process was repeated again as follow^s : — The second 

 crop of crystals was dissolved in water and evaporated down 

 till most of it crystallised out. The mother liquor was 

 added to the third crop of crystals together with enough 

 water to dissolve them, and again evaporated down to 

 crystallisation, and so on. Finally, another mother liquor of 

 about 20 c.c. was obtained and added to the first. 



To this solution barium chloride was added in slight excess, 

 and then enough barium hydrate to turn turmeric })aper 

 brown. The whole was then boiled for some time and 

 filtered, and the excess of barium was removed from the 

 filtrate with ammonium carbonate hi the usual way. 



It was then evaporated to dryness in a platinum basin, and 



