354 REPORT—1846. 
and then chloride of magnesium and excess of ammonia; no trace of the 
characteristic precipitate of phosphate of magnesia and ammonia appeared 
after several days. 
Analysis tabulated. Oxygen. 
Gilson. a!s2'.'. - Can. teens SBMS wleNiiee. vest 19°76 
Alumina ........ i. ake oo ee ne a 6°59 
RAMOS i iesie', M6 ooees & SEO vices’ 1008 
Magnesia.......... Cece PGLiwwa 4 29% ( 
Protoxide of manganese... 040.... 0°09 oe 
Protoxide of iron........ LAT cease O29 
Potassiii honors om POSS aih s covese OD] 
Sulphuret of calcium .... 0°82 
Error of loss.......... ie OLD 
100°00 
2. ANALysIs. By J. P. 
1. Weight of slag employed 25°41 grains, after having been gently heated 
over a spirit-lamp; the odour of free sulphur was distinctly remarked. 
2. Silica 9°85 
- Alumina 3°68. 
. Sulphate of lime 22:04. 
. Phosphate of magnesia 4°76. 
. Oxide of manganese 0°07. 
. Sesquioxide of iron 0°34. 
- Potass. Weight of slag employed 46°93. Chloride of potassium 0:82. 
By treatment with nitrate of silver 1:51 grain of chloride of silver was ob- 
tained, which corresponds to 0°372 of chlorine. 0°82 of chloride of potas- 
sium contains 0°389 of chlorine. 
9. Sulphur. Hydrosulphurie acid was evolved by the action of hydro- 
chloric acid. Weight of slag 20:06. The nitrous acid process was em- 
ployed. The sulphate of baryta weighed 0°63. 
10. Phosphoric acid was not sought for. 
COnF OH TS Oo 
Analysis tabulated. & Oxygen. 
SICA erect teeatis mee te ae 38°76" .is. einielcsinele }) COne 
Alumina ..... stole als 1 LAB i cc dtrentew ee, 4: GNTbe 
Laimesc. oon. ae Pig tea MSO GOL mate.) O02 
WTRETNCRIA! o's. 'o ntoiatniaha Bits 684 c.06 2°56 12°89 
Protoxide of manganese... 0°23 .... 0°05 
Protoxide of iron...... oes DIRS Fildes O87 
POtass 'x> viddebdes » = DEES Si’ <'s oh esl olde’ 8 0:19 
Sulphuret of calcium .... 0°98 
Error of loss,......... «» =O°74 
100°00 
3. Anatysis. By J. P. 
1. Weight of the slag employed 25°27, after having been gently heated 
over a spirit-lamp. 
2. Silica 9°51. 
3. Alumina 3:23. 
4, Sulphate of lime 20°68. 
5. Phosphate of magnesia 4°58. 
6. Oxide of manganese 0°72. 
7. Sesquioxide of iron 1°18. 
4 
