ANALYSIS OF BRITISH AND FOREIGN SALT. §33 



tion of muriate of soda, the other very little, The first va- 

 riety consisted of x 



Muriate of soda 050, 



Carbonate of lime 1Q 



Sulphate of lime 40 



1000 



The second variety was composed of 



Muriate of soda » 100 



Carbonate of lime 110 



Sulphate of lime 790 



1000 



Circumstances, however, are constantly occurring, to vary 

 the proportion of ingredients, both in the clearings and in . 

 the pan-scale. If, for example, the brine be short of the 

 point of saturation with common salt, it acts, when admit- 

 ted into the pan, upon the muriate of soda which the pan- 

 scale contains, and we obtain the second variety. But if the . 

 brine be fully charged with salt, it affects no solution of the 

 muriate of soda carried down along with the gypsum; and 

 then the first species of pan-scale results. 



5. The salt oil, or mother liquor from seawater, a speci- Salt oil, or 

 men qf which I received from Dr. Thomson, had the spe- mother Hqu«r 

 cine gravity of 1277. It was abundantly precipitated by 

 muriate of barytes : by pure ammonia, but not by the car- 

 bonate ; and was not changed by oxalate of potash, either 

 immediately or after an interval of some hours. One thou- 

 sand parts of the dry salt consisted of 



Muriate of magnesia .... 874 

 Sulphate of magnesia. • •• 70 

 Muriate of soda 56 



1000 



6. The saty brine, or liquor which drains from the Scotch Salt brine, or 

 It, had the specific % 

 f the same tests as t! 

 dry residue contained 



salt, had the specific gravity of only 1 188. It was affected iiq^or drained 

 by the same tests as the salt oil, but less remarkably. The ia i t# 



Muriate 



