FERMENTATION OF CARBOHYDRATES 



83 



duced are carbon dioxide (CO2) hydrogen and marsh gas 

 (CH4). Other gases of the paraffin series may also be formed 

 as ethane (CaHe), acetylene (C2H2), etc. CO2 and H are the 

 ones usually formed from sugars by the few gas-forming 



Fig. 59. — Cylinder to show 

 the formation of gas by bacteria. 

 The gauge shows 265 pounds. 

 It went beyond 500 pounds. 



Fig. 60. — A burning natural gas 

 well at night. From a photograph 

 colored. 



