228-5 



165-2 



31'6 



5-9 



24-9 



with Observations on the Analysis of Salt-brines. 95 



a portion of it is decomposed; the quantity of muriate of lime 

 is inferred from the quantity of sulphate of lime ; and the quan- 

 tity of sulphate of soda is determined from the quantities of sul- 

 phate of magnesia and sulphate of lime ohtained. The propor- 

 tions may thus be easily assigned. Referring to the preceding 

 analyses, "the proportions in a pint, according to this principle, 

 will be the following : 



According to the first analysis, 



Muriate of soda, .. 170-2 grains. 



magnesia, . . 30-6 



lime, . . 5-S 



Sulphate of soda, .. 21-9 



According to the second analysis : 

 Muriate of soda, 



magnesia, 



lime, . 



Sulphate of soda, . 



227-6 



If the opposite view be adopted, that the sulphate existing in 

 sea-water is not sulphate of soda, but sulphate of magnesia; 

 then the ingredients and their proportions will be as follow : 

 According to the first analysis. 



Muriate of soda, .. 188-3 grains. 



magnesia, . . 16 



• lime, .. 5-8 



Sulphate of magnesia, .. lS-4 



228-5 

 According to the second analysis. 



Muriate of soda, .. 185*6 



magnesia, .. 15-2 



lime, .. 5-9 



Sulphate of magnesia, . . 20*9 



227-6 

 But this view rests on no principle, and is, as I have stated, 

 less probable than the other*. 



The 



* There is sometimes obtained in the large way, from the products of the 

 evaporation of sea-water, a triple salt, which has not been noticed by che- 

 mists, but which appears to be of definite composition, and is distinguished 

 by peculiar properties, — a sulphate of miignesia and soda. It is formed in 

 purifying the sulphate of magnesia procured by the first evaporation from the 

 bittern of sea-salt. In this process tlic sulphate, which is impure, both from 



the 



