344 Analysis of the Hot Springs at Bath. 



bent tube ; the water was boiled for about tvventv minutes, 

 and the gas evolved from the water and the air of the tube, 

 except a quantity too small to be estimated, were received 

 in a graduated jar over mercur}\ Solution of potash ab- 

 sorbed 3-4ths of an inch of this gas, which was carbonic 

 acid. 



(I) The unabsorbed gas was transferred to the water appa- 

 ratus, and tried in the usual way with nitrous gas. The 

 mean result of comparative experiments upon it and atmo- 

 spheric air showed that it was merely the air of the vessel, 

 and that no nitrogen gas was held in solution by the water. 



As ten ounces of the water gave. '75 of an inch of car- 

 bonic acid, one quart would furnish 2*4. Th.is quantity is not 

 quite exact, it being scarcely poiisible to obtain the whole 

 of the carbonic acid by ebullition. 



Effects of Atmospheric Air and Re-agents. 



(K) Some of the water, v.'hile hot, having been exposed 

 in a vessel of broad surface to the atmosphere, afforded in a 

 few hours a small quantity of a white precipitate ; but water 

 which had been cooled in a closed vessel remained perfectly 

 transparent after several weeks exposure to the air. 



The re-agents added to the water while hot, and the ef- 

 fects produced by them, were the following : 



(L) Acetate of lead, — a perfectly white precipitate. 



(M) Tincture of litmus, — no alteration of colour. 



(N) Tincture of turmeric, — no change indicating the pre- 

 sence of uncombined alkali ; its colour immediately almost 

 destroyed. 



(O) Lime water, — a white precipitate. 



(P) Ammonia, — a white precipitate, 



{Q) Carbonate of ammonia, — a white precipitate. 



(R) Some of the water was boiled with a little nitric acid, 

 > — ammonia added to this gave no precipitate. 



(S) Oxalate of ammonia, — a precipitate. , "' 



(T) Nitrate of barytes, — a precipitate insoluble in nitric 

 acid. 



(U) Nitrate of silver, — a white precipitate insoluble in 

 nitric acid. 



(V) Sulphuretted 



