British and Foreign Salt. 179 



Carbonate of lime and oxide of iron ........ 2 



Muriate of lime, and muriate of magnesia, inl 



nearly equal proportions J 



Sulphate of lime 19 



Muriate of soda 974 



1000. 



2. The mother liquor, or brine that remains after sepa- 

 rating all the common salt, which it is thought worth while 

 to extract, had the specific gravity of 1208. The dry salt 

 contained, 



Muriate of magnesia . . * 35 



lime . . 32 



Sulphate of lime 6 



Muriate of soda .............. 927 



1000. 



3. The clearings of the brine, which are raked out of the 

 pan when the salt first begins to granulate, contained in 

 1000 parts, 



Muriate of soda 800 



Carbonate of lime 41 



Sulphate of lime 159 



1000. 



4. Of the substance called by the workmen pan-scale, 

 two specimens were analysed, the one containing a large 

 proportion of muriate of soda, the other very little. The 

 first variety consisted of 



Muriate of soda 950 



Carbonate of lime 10 



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 

 admitted into the pan, upon the muriate of soda which the 

 pan-scale contains, and we obtain the second variety. But 



M2 if 



