168 INORGANIC CONSTITUENTS OF THE 
Ash of Coal from the Clarence River. 
Percentage of ash in coal, 8-75 ; colour, grey. 
Analysis— 
Alumina... ne ie: OO 
Ferric oxide... 4-01 
ime 1-26 | Soluble in acid 
Magnesia ... om = “48 29°70. 
Sulphuric oxide... ai “21 
Phosphoric ,, 96 
Alumina... 
513) tnsoluble in acid 
70-25 
Silica Ss a 
Undetermined and loss 
100-00 
For comparison with these results samples of 
of the Australian Agricultural Company’s seam were obtained 
from Mr. Gregson, who kindly sent me three samples of each 
Of the roofs two specimens were much alike, and consis 
shaly sandstone containing a small quantity of coaly matter, whilst 
specimens; the remaining specimen was very similar in appear 
ance to that marked Old No. 1 way. The samples were treated in 
exactly the same manner as the coals; the organic matter —_ 
burnt off at a dull red heat, and in doing so both gre 
the roof burnt with a faintly luminous flickering flame, one of 
floor specimens with considerable flame, and the other with none. 
Roof Galley Way. 
Percentage of organic matter and water, 9-97. 
Analysis of residue— 
Alumina 
ia “ee ee 
Ferric oxide... ane oes oy ME he 
Lime ds} See an -42 | Soluble in aes 
Magnesia ... are — ——e 1181 
Sulphuric oxide... ne ‘21 
Phosphoric ,, vee wae “41 | 
Chlorine... eee 
Alumine..: |; w+ 12°31) qpsoluble in acid 
Silica ae ome veo "37°87 
Undetermined and loss 32 
100-00 
