OF SEA-WATER. 239: 
Muriate of Soda, - 159.8 grains. 
———— Magnesia, - 35.5 
———_— Lime, _- BE 
Sulphate of Soda, - 25.6 
eee 
226.1 grains.. 
These proportions differ somewhat, though not very mate-— 
rially, from those found by the other modes of analysis. The 
principal differences consist in the quantity of magnesia, and 
of sulphuric acid being rather larger. This is evidently to be 
ascribed to the modes of detecting sulphuric acid by barytes, 
and magnesia by phosphoric acid and ammonia, being so per- 
fect, that the entire quantities of them are found; while, in 
the other modes, from the difficulty of effecting the entire se- 
paration of salts from each other, a small portion of. sulphate 
of magnesia, or of muriate of magnesia and sulphate of soda, 
had remained with the muriate of soda, and though subcarbo- 
nate of soda was employed to decompose them, aie decompo- 
sition is not altogether perfect. -In the mode of analysis, too, 
by re-agents, the presence of water in the products can be 
more completely excluded, and to this, probably, is to be a- 
scribed the absolute quantity of saline matter being a little less 
‘ according to this analysis, than it is in the others *. 
Of 
* In another analysis of sea-water, in which subcarbonate of ammonia was 
employed to precipitate the magnesia, a solution of it being added to the water 
concentrated by evaporation, the clear liquor, after the subsidence of the preci- 
pitate being evaporated to dryness, the saline matter being exposed to heat, to 
dissipate the muriate of ammonia ; being re-dissolved in water, the subcarbonate 
of ammonia again added, and this repeated for a third, and eyen a fourth time, 
the results gave the following proportions of the elements, 
Lime, 
