220 AN ANALYSIS 
cohol. These liquors, poured off from a portion which remain- 
ed undissolved, were evaporated to dryness ; the dry mass was 
dissolved in water, and, by a second evaporation, afforded a 
congeries of prisms of Muriate of Magnesia. Dried by a heat 
of 150°, the weight amounted to 156 grains. Converted into 
sulphate of magnesia by the addition of sulphuric acid, the 
product weighed, after being dried at a low red-heat, 99.2 
grains, equivalent to 78.4 of real muriate of magnesia. 
H. The matter which remained undissolved by the alcohol 
G was dissolved in distilled water. The solution was evapo- 
rated, until, by a farther spontaneous evaporation in a warm 
apartment, crystals were successively formed ; these were sul- 
phate of magnesia, and, in general, bevelled prisms. The 
whole freed from moisture weighed 48.6 grains. A small por- 
tion of liquor remained, which, when evaporated, gave a deli- 
quescent saline mass: by slow evaporation 2.6 grains of muri- 
ate of soda were obtained from it ; the remainder alm mu- 
riate of magnesia equal to 3 grains. 
I. The crystals of sulphate of magnesia obtained by the 
successive evaporations, were not all equally well formed ; and 
after they had been left exposed to a dry air for some doe 
some of them became quite efflorescent, while others did not. 
The former were picked out, and each portion was re-dissolved 
in water. By a new crystallization, there were thus obtained 
72 grains of sulphate of magnesia, and 18.5 of sulphate of 
soda. 
K. The muriate of soda obtained in the preceding steps, 
amounted in all to 759.6 grains. After exposure to a red- 
heat, it weighed 752.4 grains. It has already been stated, 
that it was not perfectly pure; its solution being rendered 
milky, both by sub-carbonate of soda and muriate of barytes. 
The separation of the sulphate of magnesia, which this chiefly 
indicated, 
