Prof. Johnson'' s Report on the Bradford Coal Field. 147 



"No. 9. This specimen was from the stratum of balls three inches 

 thick, in the above mentioned opening. Its color is jKllowish or dark 

 brown. Its specific gravity is 3.4977. 



At 320°, it loses .... 



Calcined to whiteness, it loses in addition, 



And when smelted, yields of pig metal, - 



Of earthy impurities, it contains, 



And of oxygen, .... 



100.0 



" The iron is moderately tough, and of a light color, appearing rather 

 less favorable for foundry purposes than the results of the other plies in 

 the same bed. 



" No. 10. This specimen was found on Wagner's run, the precise ele- 

 vation not ascertained. It appears in many respects analogous to the ore 

 in the 37^ inch bed on Fall Creek, being a conglomerate of pebbly mas- 

 ses of clay ironstone, with a cement of earthy and ferruginous matter. 

 Its specific gravity is 2.823. 



It contains of water, . - . - 



It yields of pig metal, .... 



It contains of earthy impurities, 



Oxygen, ..... 



100.0 



" No. 11. This specimen, as well as the preceding, was found in the 

 channel of Wagner's run, but as there can be no doubt of its having be- 

 longed to a regular stratum of ore not yet explored, but of considerable 

 thickness, it was deemed expedient to examine its properties. Its spe- 

 cific gravity is 3.5065. 



" It yields 50 per cent, of pig metal, soft, gray and tough. It resembles 

 strongly the ores found in the bed of Long Valley creek, in some parts in 

 large quantities, and also has a striking similarity to the upper ply in Ma- 

 son's ore pit. It contains but 8 per cent, of matter insoluble in acids. 



" From the foregoing details, it will be observed that the yield of the 

 several ores is as follows, viz. — 



No. 1. - 32.5 No. 7. - 45.0 



2. - 24.2 8. - 43.3 



3. - 44.0 9. - 45.6 



4. - 53.4 10. - 29.8 



5. - 48.4 11. - 50.0 



6. - 29.4 Mean, 40.5 per cent. 



" Fire Clay. — At least three strata of fire clay have been observed on 

 the waters of Fall Creek; one 16 inches thick, under the 371 inch bed 

 of iron ore ; one 4 feet thick, above the 1 feet bed of ore and iron shale ; 



