1862.] 57 [Clark. 



of gas, to the oil stratum, 448 feet beneath the surface. The first 

 sandrock has a soft middle member between hard top and bottom 

 members. 



Crawford's Boring at Edenburg struck oil (for the second time) in 

 a supposed crevice leading up from the " Third White Sandstone/' 

 and at a depth of 580 feet. 



Mr. Clark gave it as his experience, that the harder the rock was 

 to drill, the lighter in color, purer in quality, and smaller in quantity 

 was the oil ; the softer the rock, the darker and more abundant the 

 oil. 



Mahoning Creek oil has a stronger smell than Oil Creek oil. The 

 surface oil of Slippery Rock Creek is as fluid as water, and quite 

 dark, running from and impregnating the surface of the ground and 

 the rocks in place, and is collected in shallow wells. 



At the Alban Well, 600 feet deep, on Oil Creek, six miles above 

 its mouth, Mr. Clark saw the fresh oil spouting 100 feet into the air, 

 a week after it had been struck. 



At the Edenburg well first described, Mr. Clark noticed that for 

 two or three weeks there occurred every day invariably a few minutes 

 after eight o'clock p.m., a blow of gas, violent enough to stop the 

 pump, and lasting from fifteen to thirty minutes, after which the gas 

 seemed to be exhausted. He thinks that there is more gas blown 

 ofi" in winter than in summer, and that the testimony among the oil- 

 well men is general to that effect. 



The Librarian presented No. 67 of the Proceedings. 

 Pending nominations Nos. 456 to 465 were read. 

 The Society was adjourned. 



Stated M.eeti7ig^ July 18, 1862. 

 Three members present. No formal proceedings. 



Stated Meeting, August 15, 1862. 

 Dr. Bache reported the following deaths of members 



