KNOX COUNTY. 347 



Recent borings for salt north of Shawnee, in Perry county, reach the 

 red shale at a depth of eight hundred and thirty feet, commencing on 

 the horizon of the blue limestone, which is here one hundred and thirty- 

 five feet below Coal No. 6, or the Great Vein of Perry county. The red 

 shale is reported as from thirty to forty feet thick, and is here also at 

 the base of the salt-bearing strata. 



Analysis op Gas from Wells. 



An analysis made by Prof. Edw. W. Morley, of the gas emitted by one 

 of Mr. Neff's gas wells, and such as is used by him for the manufacture 

 of lampblack, gave the following formula for its composition: 



Specific gravity 0.65 



Oxygen 0.8 



Carbonic acid 0.3 



" oxide 0.5 



) Marsh gas 81.4 



Carbon and hydrogen, eqai valent to J ^^^^-^ Ly dride 12.2 



Nitrogen 4.8 



100.0 



