106 Chemical examination of the water of the 



P. For Soda. — Experiments N and O taken together prove the 

 presence of soda. 



Q. For Lithia. — The residuum from evaporation was treated with 

 excess of carbonate of soda, and heated before the blowpipe on pla- 

 tina foil, without evincing the characteristic indication of this base. 



R. For Baryta and Strontia. — To the dry residuum from evap- 

 oration, hydro-chloric acid was added. The clear solution was treat- 

 ed with a saturated solution of sulphate of lime : no cloudiness was 

 apparent. Hence these bases are not present in the water. 



S. For Lime. — Oxalate of ammonia produced a precipitate be- 

 fore and after boiling. Lime is therefore present. 



T. For Ammonia. — The addition of potassa to a hot, concentra- 

 ted solution of the water, afforded no odor of ammonia. 



U. For Magnesia. — From the partially evaporated water, the 

 lime was cleared by oxalate of ammonia and to the decanted, superna- 

 tant fluid was added bi-carbonate of ammonia and phosphate of soda, 

 without troubling its transparency. Hence no magnesia is present. 



V. For Alumina. — A portion of the residuum was heated before, 

 the blowpipe on charcoal, and moistened by nitrate of cobalt: a 

 bright blue color made its appearance at a single point of the mass, 

 indicative of the presence of alumina. 



W. For Iron. — Tincture of nutgalls caused no discoloration in 

 the water, even after it was reduced to three quarters its bulk by 

 evaporation. Ferrocyanide of potassium merely produced a yellow- 

 ish green color after standing many hours. No iron therefore exists 

 in the clear water. 



X. For Manganese. — The absence of all color in the residuum 

 from evaporation of the water, both before and after ignition, proves 

 the absence not only of iron, but of manganese. 



Examination of the Jiocculent precipitate from the water of the 

 new spring. — It was contained in about three ounces of the water,' 

 and occupied the lower third of this fluid, as contained in a five- 

 ounce vial. Its appearance was that of grayish films, intermingled 

 with black particles. On opening the vial, a strong hepatic odor 

 was emitted, accompanied by the smell of extractive matter. The 

 water was much more saline in its taste, than that of the spring which 

 had not been kept in contact with the precipitate. It was examin- 

 ed for the following substances. 



a. For SuJphvr. — A portion of the precipitate was treated with 

 nitric acid in a flask : a strong odor of hydro-sulphuric acid was emit- 



