FRANCIS — ON COAL DEPOSITS. 
127 
Proximate Composition. 
Volatile matters — 
Hydrocarbons 59*035 
Water 0*664 
Fixed matters — 
Ash 3*294 
Coke 37*007 
100*000 
Ultimate Composition. 
Carbon ... ... 76*463 
Hydrogen 7*663 
Nitrogen 1*753 
Oxygen ... ... ... ... ... ... 6*349 
Sulphur 3*814 
Ash 3*294 
Water 0*664 
1 00*000 
Calorific equivalents for 100 of mineral — 
Carbon 617821 heat units. 
Hydrogen ... 236753 „ „ 
854574 „ „ 
Purified illuminating gas evolved from one ton of mineral — 
Expt. i. 9887*9 cubic feet. 
„ ii 10248*3 „ „ 
Ammonia corresponding to nitro- \ 
gen in one ton of mineral £ 
Equal to ammonium sulphate 
Sulphur as calcium sulphate in ash. . . 
Total sulphur 
47*680 lbs. 
224*777 „ 
Trace. 
3*814 per cent. 
The above analytical results show this mineral to be a 
fairly pure variety of compact asphalt or glance pitch. 
Although in ultimate composition coal and asphalt are closely 
allied, their behaviour under the action of heat and solvents 
