of Australian Coal. 
197 
Hydrogen . 14-35 
Oxygen. 4*50 
Nitrogen. 600 
Geological situation. —It lies in beds of 2 feet thick in 
clays bordering upon the transition formation ; no impres¬ 
sion of plants is perceivable, nor any sandstone visible, 
and the want of a natural section precludes a more accurate 
investigation of that series: the two shafts sunk to the 
depth of 150 feet below the crop of the seam discover 
nothing but hornblend rock, dolerite and steatitic rocks, 
with sulphate and carbonate of lime. 
JERUSALEM, TASMANIA. 
Slate Coal. ( Jamieson .) 
(Syn, — Houille Grasse, Brongniart .) 
External character .—Colour black, structure slaty, 
layers dividing into fragments of undetermined angular 
shape, fracture even, lustre resinous, shining, brittle; 
specific gravity 1*33. 
Chemical character. —It burns with a splendid white 
and reddish flame, easily lighted, emitting black smoke, 
swelling and agglutinating: its proximate elements are— 
The Upper Seam. 
Charcoal .64*0 
Bitumen .32-0 
Earthy matter. 4’0 
Lower Seam , at 32 feet deeper. 
Charcoal . 25-0 
Bitumen . 10*0 
Carbonate of lime .. 57*0 
Silica .. 8*0 
Applied to the production of gas, the coal of the upper 
seam will give 2 cubic feet of illuminating gas for every 
pound consumed. 
Moreover, it gives in every 100 parts of weight— 
Coal-tar and ammoniacal liquor 12-6 
Coke. 77-0 
The gaseous mixture, examined by re-agents, contains 
in 100 volumes— 
