The University of Arizona 



College of Agriculture 



Thirty-First Annual 

 Report 



of the 



Agricultural Experiment Station 



For the Year Ended June 30, 1920 



This Report constitutes Part 111 of the 

 Annual Report of the Board of Regents 

 of the University of Arizona, made in 

 conformity to Article 4483, Title 42, Re- 

 vised Statutes of Arizona, 1913. 



Tucson, Arizona, December 31, 1920 



