5 82 



VARIOUS FERTILITY FACTORS 



animals and possibly for the people, unless relieved by food 

 supplies from other sections. 



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. \ 26-30"^ 

 / j /\ 



AVERAGE ANNUAL PRECIPITATION IN DIFFERENT PARTS OF THE UNITED 

 STATES (in inches) 



The accompanying map of the United States showing the average 

 annual rainfall is based upon the record of the United States 

 Weather Bureau, and furnishes some exceedingly valuable infor- 

 mation. It will be noted that the average rainfall is about 35 

 inches for eastern Kansas and southeast Nebraska, about 25 

 inches for central Kansas and east-central Nebraska, and about 15 

 inches for the western parts of those states. The average annual 

 rainfall of the United States varies from less than 10 inches in 

 the Great Basin to more than 60 inches over small areas on the 

 coast. 



Some portion of the arid region will be reclaimed by irrigation; 

 but while this subject is receiving much attention, with extensive 

 advertising of both private and public enterprises, it can never be 

 a very large factor in American agriculture. Director Frederick 

 H. Newell, of the United States Reclamation Service, makes the 

 following statements concerning the arid region (" Conservation of 



