628 GEOLOGY OF OHIO. 



The ultimate composition of sample No. 2 was determined as follows : 



Carbon 71.43 



Hydrogen 5.92 



Nitrogen 1.54 



Sulphur 0.63 



Oxygen 18.38 



ABh '. 2.10 



The moisture (6.80 per cent.) is included in the above constituting 0.75 

 hydrogeEL and 6.05 oxygen. 



Passing from the head of Meeker Kun northward, we find the original 

 mine of W. B. Brooks, Esq. Here the Nelsonville seam presented the 

 following structure : 



FT. m. 

 Shale. 



, Coal 2 



Shale 3 



Coal ; 2 4 



Shale 2 



Coal 1 7 



It is sometimes a little thicker, the thickening taking place in the 

 upper bench. , 



The first analysis of any coal from the Hocking Valley proper, after the 

 Geological Survey was inaugurated, was Of a sample furnished by Mr. 

 Brooks from this mine. It is here given because it attested the great 

 excellence of the coal, and proved quite a stimulus to those of us who 

 were engaged in the investigation of the Nelsonville seam : 



Specific gravity 1.259 



"Water C.80 



Ash 2.46 



Volatile combnstible matter 33 28 



Fixed carbon 57.36 



Total 99.90 



Sulphur 0.74 



At a later date I visited the mine and obtained samples of the coal 

 from the three different benches of the seam, which were analyzed by 

 Prof. Wormley : 



No. 1, lower bench. 

 No. 2, middle bench. 

 No. 3, upper bench. 



