nith Ohservations on the Analysis of SuU-lnnes. 19 



stallizations were less distinct in foim, and .veie in part deli- 

 quescent. 



C. The portion of liquor still remaining was evaporated, until, 

 on cooling, it formed a congeries of slender prisms, which, ex- 

 posed to the air, deliquesced, and soon passed to a state of 

 perfect solution, a proof of their being principally muriate of 

 magnesia. 



'J'he products thus obtained, consisted, first, of muriate of soda 

 A; secondly, of sulphate of magnes{;i B: and, thirdly, of mu- 

 riate of magnesia C. These, however, eoilld not be supposed 

 to be pure, and they were, tlierefore, submitted to furtlier ex- 

 amination. 



D. The muriate of soda A, gave indications of the intermix- 

 ture of magnesian salts ; the solution of a minute portion of it 

 in distilled water becoming turbid on the addition of carbonate 

 of soda. It was also to be presumed, that there would l)e mixed 

 with it any sulphate or carbonate of lime deposited during the 

 evaporation. It was therefore redissolved in water. There re- 

 mained undissolved a residue, which, when thoroughly dried, 

 weighed 22*6 grains. The salt was again procured by evapo- 

 ration, but it was still not perfectly ])ure. Its dilute solution 

 gave a milkiness with carbonate of sodaj and oxalate of am- 

 monia and muriate of barytes rendered it turbid, indicating the 

 presence either of a little muriate of lime with sulphate of soda, 

 or magnesia, or of sulphate of lime with a portion of sulphate or 

 muriate of magnesia. The whole was redissolved in distilled 

 water; a powder, similar in appearance to the insoluble residue 

 of the former solution, remained undissolved, which, when 

 thoroughly dried, weighed 10*3 grains. To the clear solution a 

 portion of alcohol was added, not sufficient to cause any preci- 

 pitation of muriate of soda ; it produced a slight turbid appear- 

 ance, and after some hours a powder had subsided, which, after 

 being washed with water, was tasteless: it weighed 1*5 grain. 

 The muriate of soda, obtained by evaporation, weighed, when 

 <lried, 7 IS grains. Being still not entirely pure, it was reserved 

 for another o|)eration. 



E. The insoluble residues collected in the preceding operations 

 being put together, were submitted to the action of alcohol, aci- 

 dulated with muriatic acid, to remove anv carbonate of lime, or 

 of magnesia. Effervescence was excited ; the liquor being poured 

 off, and the insoluble residue of sulphate of lime being washed 

 with a little water, weighed, after exjjosure to a heat nearly equal 

 to ignition, 2G*3 grains. The alcoholic solution, with the ad- 

 dition of the small portion of water with which the sul])hate Oi 

 lime had been washed, afforded, by evaporation, a matter which 

 entered readily into fusion, and which, treated with suljjhuric 



B 2 acid 



