FORMATION OF CO^L. 



A change in the sediment brought down by the water would 

 produce an alteration in that portion of the seam of coal which 

 was at the time being submerged, and it would differ in quality 

 from that portion so far submerged and covered up, as not to be 

 affected to any great extent by the altered circumstances. 



In support of what I have said, I would call attention to the 

 fact that a coal containing much sulphur (which is mostly in the 

 form of Pyrites) has a decreased amount of Carbon, which is just 

 what would follow as a result of the changes described. 



