58 Messrs. Merck and Galloway's Analysis of 



4. In the liquid filtered off from the oxalate of lime (3.), 

 phosphate of soda produced an exceedingly slight crystalline 

 precipitate : — Shoiving the presence of magnesia. 



Note. — ^This precipitate could only be distinctly seen in 

 testing a large quantity of the water. 



b. Analysis of the substances remainiiig dissolved. 



The liquid which was filtered from the precipitate (a.) 

 formed on boiling had no alkaline reaction ; a portion of it 

 was evaporated nearly to dryness and treated with hydro- 

 chloric acid ; no carbonic acid was evolved, from which com- 

 portment the absence of alkaline carbonates could with safety 

 be concluded. 



1. A portion of the liquid gave on addition of chloride of 

 barium a copious white precipitate, insoluble in hydrochloric 

 acid : — Indicating sulphuric acid. 



2. In another portion of the liquid nitrate of silver pro- 

 duced a copious white precipitate, easily soluble in ammonia : 

 — Evidencing the presence of chlorine. 



3. The entire solubility of the silver precipitate seemed to 

 indicate the absence of iodides. To make ourselves perfectly 

 certain of the absence of these salts, 30 or 40 pounds of the 

 water were evaporated to 2 or 3 pounds, and the liquid filtered 

 off from the precipitate which had been formed ; a part of this 

 fluid was evaporated with precaution to dryness, the residue 

 was mixed with some starch paste, and a few drops of nitric 

 acid being added, feeble but distinct violet spots were ob- 

 served : this experiment was repeated several times with the 

 same success : — Indicating the presence of iodine. 



4. Another portion of the liquid {b.) was treated with hy- 

 drochloric acid, evaporated to dryness, and gently ignited : on 

 treating the residue with a large quantity of water an insolu- 

 ble portion remained: — Showing the presence of silicic acid. 



5. Another portion of the liquid {b.) gave, on addition of 

 chloride of ammonium and oxalate of ammonia, a white pre- 

 cipitate : — Indicating lime. 



6. On adding, to a portion of the filtrate, ammonia and 

 phosphate of soda, a slight crystalline precipitate was formed : 

 — Indicating magnesia. 



7. For the discovery of the alkalies, the remaining portion 

 of the filtrate from the lime precipitate Avas evaporated to 

 dryness, and the residue ignited until the ammoniacal salts 

 had been expelled. The ignited residue was then dissolved in 

 water, the sulphuric acid and magnesia precipitated by baryta 

 water, and after separation of the excess of baryta by means 

 of carbonate of ammonia, the filtrate evaporated to dryness 



