of Australian Coal . 193 
PORT ARTHUR, TASMANIA. 
Coarse Coal. 
(Syn. — H ouille grossiere, Brongjiiart.) 
External character .—Its colour is steel grey, sometimes 
blackish ; structure usually slaty; its cross fracture is 
coarse-grained, harder than the common slate coal, and 
heavier; its specific gravity P44. 
Chemical character .—It burns with difficulty and 
slowly, unless kindled by wood ; emits little or no smoke; 
its flame is blue and clear as that of anthracite, which, 
in its external character, it most resembles; it does not 
agglutinate, nor cake ; its proximate constituents are_ 
Charcoal . 86* 
Bitumen . 3*5 
Alumine ... 7- 
Silica. 2* 
Iron undetermined. 
Loss . 1*5 
Applied to the production of gas, one pound yields 
1J cubic feet of illuminous gas, some water strongly 
saturated with hydro-sulphurets, but no coke or tar. 
The gaseous mixture examined contains in 100 vo¬ 
lumes— 
Sulphuretted hydrogen . 18* 
Carbonic acid . 12 # 
Olefiant gas . 3* 
Carburetted hydrogen. 5* 
Other inflammatory gas .... 62* 
Analysed with peroxide of copper, the quantities of its 
ultimate elements, abstracted from earthy matter, stand 
in the following proportion :— 
Carbon . 80*0 
Hydrogen .. 8*8 
VOL. I. NO. III. 
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