PHILLIPS. — COMPOSITION OF NATURAL GAS. 79 



2. Well on the Auderson farm at Sewickley, 12^ miles west from 

 Pittsburgh. This well was drilled in 1894, and yields gas exclusively 

 from the Third Sand, which was found at a depth of 1,850 feet. 



Date of Collection of Samples. Percentage of Nitrogen found. 



July 7, 1896 (1) 2.48 



(2) 2.50 



August 14, 1896 (1) 1.72 



(2) 1.71 



March 22, 1897 (1) 2.11 



(2) 2.10 



3. Well on the Mliller farm at Glenfield, Pa., 9^ miles west from 

 Pittsburgh. Drilled in 1887. The gas is produced mainly from the 

 Fourth Sand, although a little gas finds access to this well from the 

 upper sands. The Fourth Sand was reached in this well at a depth of 

 1,800 feet. 



Date of Collection of Samples. Percentage of Nitrogen found. 



July 27, 1896 (1) 1.52 



August 17, 1896 (1) 1.69 



(2) 1.69 



April 2, 1897 (1) 3.24 



(2) 3.25 



April 16, 1897 (1) 3.23 



(2) 3.21 



April 28, 1897 (1) 3.23 



(2) 3.20 



May 4, 1897 . (1) 3.20 



(2) 3.22 



April 8, 1898 (1) 2.10 



(2) 2.10 



April 21, 1898 (1) 2.12 



(2) Lost. : 



June 9, 1898 (1) 1.27 



(2) 1.30 



June 13, 1898 ....... (1) 1.23 



(2) 1.22 



4. Well on the Bayley farm, Neville Island in the Ohio River, 6^ 

 miles west from Pittsburgh. The well was drilled in 1892. Gas is 



