MINERALS, 



411 



Titon in New Jersey, But the most valuable coal 

 v/hich has yet been discovered, is that fronri the 

 county of Northampton, state of Pennsylvania, near 

 the Lehigh river. Of this coal, a particular account 

 is given by Dr. Woodhouse, in the Philadelphia Me- 

 dical Museum. 



This coal is found in immense quantities in Penn- 

 sylvania, in the county of Northampton, near the 

 river Lehigh. It is of a shining black colour, and 

 stains the iiands very little. Its fragments are ta- 

 bular, as may be seen particularly after it has been 

 submitted to heat. Its specilic gravity is 16,181. It 

 burns v^ith very little llame, and no smoke; is with 

 some difficulty kindled, and requires a considerable 

 draught of air to keep up its combusdon. 



When perfectly consumed, it leaves behind a 

 f^mall portion of white siliceous earth, containing no 

 potash, and sometimes coloured brown, by means 

 ' /of iron. It does not contain any sulphur. 



^' A fire was kindled at half past eleven o'clock, 

 hy placing a quantity of the Lehigh coal, upon a 

 stratum of common charcoal in a powerful air fur- 

 mice, which was then filled with ev|ual portions of 

 the two substances. 



''As fast as the charcoal consumed, the Northamp- 

 ton coal was added, and at half past one, the furnace 

 was completely filled with it, and two-thirds of it 

 red hot. At four o'clock the coal was half consumed, 

 and it continued burning until eleven o'clock at 

 ^iight. 



James river coal submitted to an experiment of 

 the same kind, burned cut in four hcurs. 



