ANALYSIS OF BRITISH AND FOREIGN fALT. <Q$\ 



which decomposes the sulphate of magnesia only. I had 

 then a solution containing muriate and sulphate of soda, 

 with sulphate of ammonia, and some carbonate of ammo- 

 nia. This solution was evaporated to dryness, and the mass 

 was sufficiently heated to expel the amraoniacal salts. 1 

 found, boynefer, that at this temperature the suiphul« of 

 ammonia acted upon the muriate of soda, and produced an 

 additional, and not inconsiderable quantity of sulphas 

 soda. 



' Having determined, by the foregoing processes, the quan- Impurities de* 

 tity and kind cf the earthy muriaUs, the amount of the in- ^^eight'of 

 soluble matter, and the proportion of sulphates, the weights muiiate of 

 of *dl these different impurities were added together* and,* **** 

 the sum beingdeducted from the weight of the salt submit- 

 ted to experiment, the remainder was assumed as the amount 

 of the pure muriate of soda in the specimen under exami- 

 nation*. 



Though I purposely refrain from giving the details of the Additional 

 several analyses, which were made according to the foregoing cucumi>Uuccs * 

 plan, from the conviction that they would be both tedious 

 and unnecessary, yet there are a few circumstances, which it 

 may be proper to mention more fully than can be done in 

 the form of a table. 



1. The trine which I examined was from Northwich, and Brine from 

 was sent me in the state in which it was taken from the Northwich « 

 springf . At the temperature of 56° Fahrenheit, it had the 

 specific gravity of 12Q5, It was perfectly Jimp.d, but lost a 



* I have deemed it unnecessary to state, in the table, the arvjtities 

 of the acid and base in several varieties of muriate of soda. They may 

 readily be estimated from the proportion, deduced by Dr. Marcet, of 

 4(3 acid, and 54 soda, ia 100 of the pure muriate. In this determination 

 he assumes, that }0Q parts of luna flomea- after being melted d 

 heated to redness, consist of 1905 parts of acid to 80-95 oxide of sil- 

 ver. Thiij statement agrees very nearly with the recent one of Gay- 

 Lussjic, who makes 100 parts of silver to combine with 760 oxigen, 

 and this oxide to neutralize 25*71 p :ts of real muriatic acid. 



•f I have lately been informed, that this brine had been pumped oufr 

 of a rock-salt mine, into which, from ti.e impossibility of obtaining the 

 salt in a solid form, it wp-b allowed to flow. Hence it was fully satu- 

 rated with muriate of So4ft| 



little 



