80 



PHYSIOLOGICAL ACTIVITIES 



In the author's opinion natural gas and petroleum have 

 been formed in this way^ (Figs. 54 and 55). 



Fig. 53. — Cylinder to show 

 the formation of gas by bacteria. 

 The gauge shows 265 pounds. 

 It went beyond 500 pounds. 



Fig. 54. — A burning 

 well at night. From : 

 colored. 



natural gas 

 photograph 



^ See "Oil and Gas in Ohio," Bownocker: 

 Fourth Series, Bull. I, pp. 313-314. 



Geological Survey of Ohio, 



