140 Prof. JohnsoTi's Report on the Bradford Coal Field. 



" The ashes are dense, and of a grayish white color. 

 " No. 3. This sample is from the second ply of the same bed, the thick- 

 ness of which is two inches. Its specific gravity is 1.4651. 

 At 220° it loses of moisture, - - - 



At redness it is decomposed, giving of water, 



of gas, - 

 It contains of carbon, - - - . 



And of earthy matter, - - - _ 



100.0 



"The ashes are light, and have a white color, very slightly inclining to 

 buff. 



"No. 4. This sample of coal was taken from the old drift of Miller's 

 opening, north-west of the head of Fall creek, and from the middle coal 

 of that bed, which is \Q\ inches thick. Its structure is somewhat irregu- 

 lar, inclining to rhombic, and its color rusty brown. The surfaces of de- 

 position present distinct traces of vegetable fibres in the state of charcoal. 

 Its specific gravity is 1.3771. 



It loses in moisture at 220°, - - - 



At a red heat it parts with water, 



And of combustible and other gases, - 



It contains of earthy materials. 



And of carbon, _ _ _ . 



100.0 



" The ashes of this coal are almost perfectly white, or but very slightly 

 inclining to buff. 



" No. 5. This specimen is from the lower part of the upper 32 inch ply 

 of coal in Miller's old drift, and possesses a cubical structure, with a spe- 

 cific gravity of 1.3784. 



It possesses of hygrometric moisture, - - 1.0 per cent. 



Water given out in coking, - - 3.5 " 



Gas volatilized by bright red heat, - - 14.7 " 



Carbon, .... - 65.5 " 



Earthy impurity, - - - - 15.3 " 



100.0 



" The ashes are moderately light, and of a gray color, compounded of 

 white and chocolate. 



"No. 6. Thissample was likewise from the upper, or 32 inch ply of coal 

 in the old drift before mentioned. It possessed the cubical structure, and 

 fine deep black color. Specific gravity 1.3492. 



