U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY-BULLETIN No. 4. 



B. r, GALLOWAY, Chief of Bnmin. 



EANGE IMPROVEMENT Ii\^ ARIZONA. 



(COOPERATIVE EXPERIMENTS WITH THE ARIZONA 

 EXPERIMENT STATION.) 



DAVID GRIFFITHS, 



EXPERT, IN CHAROE OF FIELD MANAGEMENT, 

 GRASS AND FORAGE PLANT INVESTIGATIONS. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1901. 



