OP SEA-WATER. 221 



indicated, was not to be completely looked for by solution and 

 crystallization. Sub-carbonate of soda was therefore added to 

 the solution as long as any precipitation took place ; the preci- 

 pitate heated with a sufficient proportion of sulphuric acid to 

 redness, gave 16.4 sulphate of magnesia, equivalent to 33.7 of 

 the same salt crystallised. The former quantity abstracted 

 from the weight of the muriate of soda, reduces it to 736 

 grains. 



This analysis, then, affords the following ingredients, and 

 their proportions in their real state. 



Muriate of Soda, - 736 grains. 



Muriate of Magnesia, - 85.8 



Sulphate of Magnesia, - 51.2 



Sulphate of Soda, - 8 



Sulphate of Lime, - 29.3 



Or, reducing them to a pint of the water, 



Muriate of Soda, 



184 grains 



Muriate of Magnesia, 



21.5 



Sulphate of Magnesia, 



12.8 



Sulphate of Soda, 



2 



Sulphate of Lime, 



7.3 



227.6 



By the two modes of analysis now stated, different results 

 have been obtained. There are common to both as the prin- 

 cipal products, Muriate of Soda, and Muriate of Magnesia. 

 But in the one, sulphate of magnesia, with only a small pro- 

 portion of sulphate of soda, are procured. In the other, sul- 

 phate 



