120 Dr. Henry’s Analysis of several Varieties 
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 admitted 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 effects no solution of the muriate of soda, 
carried down along with the gypsum ; and then the first spe- 
cies of pan-scale results. 
5. The salt oil, or mother liquor from sea water, a speci- 
men of which I received from Dr. Thomson, had the specific 
gravity of 1277. It was abundantly precipitated by muriate 
of barytes : by pure ammonia, but not by the carbonate ; and 
was not changed by oxalate of potash, either immediately or 
after an interval of some hours. One thousand parts of the 
dry salt consisted of 
Muriate of magnesia - 
“ 6 * 8 74 
Sulphate of magnesia - 
- 70 
Muriate of soda 
- 56 
\ 
1000. 
6. The salt brine, or liquor which drains from the Scotch 
salt, had the specific gravity of only 1188. It was affected by 
the same tests as the salt oil, but less remarkably. The dry 
residue contained 
