[ 'S8 ] 



The ftandard quantity of nitre was alkalized by 88 grains 

 of this coal. Hence loo grains of it contain nearly 57 of mere 

 carbon, 41,3 of a mixture of maltha and afphalt, and 1,7 of 

 afhes. That it contains both maltha and afphalt is evident from 

 its flame and caking. The proportion I cannot exadly afcer- 

 tain, but moll probably the afphalt predominates. 



Wigan Coal. 

 Its colour is black. 



Its luftre 3. greafy. Tranfparency o. 



Its fradlure plane foliated. The lamellse, fome uniformly 

 fome promifcuoufly diredled. In the grofs often flaty. Forms 

 feparate concretions, often with bright yellowifh illinitions. 



Its hardnefs 6. Specific gravity 1,268 by my trials. 



It burns with a bright flame, and quicker than the foregoing, 

 and is lefs apt to cake. 328 grains of it expofed as the former 

 to a ftrong heat left 5,13 grains of afhes, that is 1,57 per cent. 

 81 grains of it decompofed 480 grains of nitre. Hence 100 

 grains of it contain 61,73 of carbon, 36,7 of a mixture of 

 maltha and afphalt, and 1,57 of afhes. 



It feems to contain a larger proportion of maltha with refpedl 

 to its quantity of afphalt than Whitehaven coal does. 



Swanfey 



