ILLUSTEATIONS. 



FiGUKB 7. Chart showing the present tendency of the United States in respect 

 to its unmined reserve of petroleum. Data from United States 

 Geological Survey 54 



8. The relative output of the principal oil fields of the United States 



from 1900 through 1917. Note the dominant positions held by 

 the Kansas-Oklahoma and CaHfomia fields. Data from United 

 States Geological Survey 56 



9. Chart showing the approximate degree of exhaustion of the principal 



petroleunk fields of the United States. The "unused portions" 

 can be greatly increased by reconstructed methods of production. 

 Data from United States Geological Survey 57 



10. Curve showing the usual decline in oil-field production after the 



period of maximum output is reached. After Ralph Arnold, 

 The petroleum resources of the United States, Smithsonian 

 Report for 1916, page 283. Compare this theoretical curve of 

 final decrease with the production curves shown in figure 8 58 



11. The current petroleum situation in the United States. Data from 



United States Bureau of Mines, United States Geological Survey, 



and other sources. Prepared in February, 1918 65 



12. Diagram showing the relation of oil wells to property lines in a typical 



portion of the most productive light-oil field in the world. Note 

 the small holdings, excessive number of wells, and the tendency 

 of wells to occur in pairs on the opposite sides of property lineB. 

 This diagram epitomizes the fimdamental cause of petroleum 

 waste in the United States. Data from map by Carl H. Beal, 

 Geologic structure in the Cushing Oil and Gas Field, Oklahoma, 

 Bulletin 658, United States Geological Survey, 1917, plate 4 86 



13. Diagram showing the typical imderground occurrence of oil, gas, 



and water, and the customary discordant relations between 

 property lines and geologic occiurrence. The migratory character 

 of oil renders this type of development imsoimd as leading to a 

 racing and wasteful extraction of the oil. This diagram expresses 

 the underground relations of the surface conditions depicted by 

 figure 12. Data from Carl H. Beal, Geologic structiure in the 

 Cushing Oil and Gas Field, Oklahoma, Bulletin 658, United 

 States Geological Survey, 1917, figure 3 and plate 4 87 



14. The distribution of the water-power resoiu-ces of the United States . . 120 



15. Chart showing the developed water power of the United States con- 



trasted with the total resoxirce . > - 121 



