COALS OF NEW SOUTH WALES. 175 
These ashes distinguish themselves from those of the north in 
mite much less phosphoric oxide ; the average of the former 
giving 1-5 per cent., of the latter 0:22 per cent. The ratio of the 
soluble to the insoluble alumina i is greater and the range is also 
greater, especially owing to including the inland coals with those 
of the coast, which by Beaicncies are tolerably uniform. 
The ratios of insoluble to soluble alumina are :— 
Berrima 1 : 21-4 
egy 1 ; 109 
j ee sare. 3 
ena Wallsend Loe 
warra wie oh l : 34 
a. fk, int “si SL j Sia I 
of alumina as these ashes would scarcely be so descri s the 
total al varies in them from 35 per cent. to 40 per cent. 
they are richer in that than almost any fire-clay. It there- 
fore a as 
which 4 1s readily soluble, is Pagan due to an original assimilation 
by the coal-producing plan 
COALS OF WESTERN DISTRICT. 
VALE oF Ciwypp CoLLIERY. 
Specific gravity of coal, 1-328 ; percentage of ash, 9°72 ; 
sh, grey. 
‘ } oe colour of as 
unina 22-91) 
Ferric oxide... 1: 
Lime oe sh ‘81 | Soluble in acid 
Magnesia... ... ~—... traces [ =. 26-03 
Sulphuric oxide... .... ‘17 
Phosphoric ,, 3 59 
Alumina * 14-55 1 
me oxide. oa. traces; | Insoluble in acid 
Silica ee a es P7885 
Undetermined and loss... “12 
