ON THE ORYSTALLINE SLAGS. 355 
8. Potass. Weight of slag 50°47. Chloride of potassium 1°53. By the 
addition of bichloride of platinum to the solution a copious yellow granular 
precipitate was produced. Carbazotie acid also occasioned a copious pre- 
cipitate. Antimoniate of potass occasioned a minute quantity of precipitate. 
9. Sulphur. Hydrosulphuric acid was evolved by the action of hydro- 
chloric acid, and the odour of free sulphur was also observed on the appli- 
_¢ation of heat. Weight of slag, after gently heating over a spirit-lamp, 20°13. 
_ The nitrous acid process was employed. Sulphate of baryta 0°58. 
Analysis tabulated. Oxygen. 
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Protoxide of manganese... 2°64 ...... 0°67 
Protoxide of iron........ 3°91 ...... O91 
Potiies ides SPR cate eae s - 032 
Sulphuret of calcium .... 0°68 
Error of loss........%++: 0°34 
100-00 
4, AnALysts. By D. F. 
1. Weight of slag employed 25°38 grains. 
2. Silica 9°62. 
3. Alumina 3:30. 
4, Sulphate of lime 21°43. 
5. Phosphate of magnesia 5°09. 
6. Oxide of manganese 0°76. 
7. Sesquioxide, of iron 0°35. 
_ 8. Potass. Weight of slag employed 75°68. The weight of the chloride 
was lost after the calculation of the potass. 
9. Sulphur. The process by fusion with nitrate of potass and a mixture 
of carbonate of potass and soda was adopted. Weight of slag 20°83. Sul- 
phate of baryta 2°45. 
_ 10. Phosphoric acid was not detected by the process resorted to in No. 1 
- (sup. Pp. 353). 
Analysis tabulated. Oxygen. 
PUMOlr 6 eae .n. sk 6 Rak bh Oe he sales ree er 19°69 
AAD ii: ee ef) 0) ra Sakis tra, OO 
TGMO. . cig Weck Nad». 2.0 BRA bias oc 8°73 
Magiesiat a osc tis ong) TRA, cae os 281 | 19.97 
Protoxide of manganese.. 2°79 ...... 0°52 
Protoxide of iron........ OB acini an) OF 
Protas Fs. . 4s ae ihe Klaha ACD sik wh ace an Hn a, 1), OPE 
Sulphuret of calcium .... 3°65 . 
Error of loss....... icaee . O44 
100-00 
5. Anatysis. By D. F. 
J. Weight of slag 25°76 grains. 
 Q. Silica 10°18. 
3. Alumina 3°89. 
_ 4, Sulphate of lime 21:23. 
