ILLUSTRATIONS. 



PLATE. 



Plate I. The instrument inclosure at the Hays Experiment Farm, Hays, 



Page. 



TEXT FIGURES. 



Fig. 1. Chart showing the distribution of the annual rainfall in the dry- 

 farming sections of the United States 10 



2. Chart showing the monthly distribution of the rainfall at representa- 



tive stations in the Great Plains, Intermountain, and Pacific coast 



regions 12 



3. Chart showing the average monthly precipitation at different points 



in the western United States 14 



4. Chart showing the evaporation in inches during the six summer 



months from April to September, inclusive, for various points in 



the United States 17 



5. Outline map of the States in the Great Plains region, showing the lines 



of equal rainfall and lines of equivalent rainfall 22 



6. Rainfall map of Arizona 33 



7. Rainfall map of California 34 



8. Rainfall map of Colorado 35 



9. Rainfall map of Idaho 36 



10. Rainfall map of Kansas 37 



11. Rainfall map of Montana 37 



12. Rainfall map of Nebraska 38 



13. Rainfall map of Nevada 38 



14. Rainfall map of New Mexico 39 



15. Rainfall map of North Dakota 40 



16. Rainfall map of Oklahoma 40 



17. Rainfall map of Oregon 41 



18. Rainfall map of South Dakota 41 



19. Rainfall map of Texas, western part 42 



20. Rainfall map of Texas, eastern part - 43 



21. Rainfall map of Utah 44 



22. Rainfall map of Washington 45 



23. Rainfall map of , Wyoming 45 



188 



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