[ H9 ] 



may be feen adhering to the fides of the crucible. This lofs being 

 repeated at every projedion becomes at laft intolerable. 



I NOW proceed to relate the experiments themfelves, conduded 

 in the manner I have mentioned. The different fpecies of coal 

 and bitumen whofe compofition I have thus examined were Kil- 

 kenny coal, Maltha, Afphalt, Lancafhire, Cannel, Slaty Scotch 

 Cannel, Whitehaven, Wigan, Swanfey and Leitrim, feleding of 

 each fort the purefl fpecimens, free from pyrites and vifible flony 

 matter. 



Kilkenny Coal. 



Its colour is black, and when frefh broken frequently violet. 



Its luftre 4. metallic. Tranfparency o. 



■t Its fradure foliated, the courfe of the lamellse varioufly and 



confufedly direded. 



Its fragments rather fharp, and often difcovering between the 

 diflind concretions whitifh illinitions. 



Its hardnefs 7. Specific gravity 1,526. 



Does not burn until wholly ignited, and then flowly confumes 

 without caking or emitting flame or fmoke. 266 grains of it 

 expofed to a heat of 27° of Wedgwood in a crucible for five 



hours 



