J.W. Mallet on the Separation of Lithia and Magnesia. 429 
Actually Contained. Found. 
: "No. ec: No. 2. No 1. No. 2. 
Lli0 - - - - 67-67 48°83 58°84 45°13 
MgO - - - 32:33 S117; )) SRB 79°48 
100°00 100°00 143°79 124°61 
The gross inaccuracy of the above results proved on examina- 
tion to arise from the action of oxyd of mercury upon chlorid 
of lithium, removing from it, as from chlorid of magnesium, 
chlorine, which was replaced by oxygen; so that a large amount 
of caustic lithia was found. The caustic alkali had acted ener- 
wit 
acid, filte: nd chlorine precipitated from the filtrate by nitrate 
of - sa pa picuie of chlorid of silver were obtained =°8279 
grm. 
Pp. ¢. is th 
of the chlorine had been replaced by oxygen 
fter igni ittle Ww: 
strongly alkaline to test paper, although the quantity of caustic 
Th ) zelius, therefore, thus applied, will not 
Sag gt geet 3 jours tion of Sg a te aml ag 
lain crucibles might be rey y platinum ones, 
dithia, a i | known, with great energy upon platinum, 
. and nie Raf teg ome FE least be seriously injured, even 
