Issued April 22, 1910. 



U. S. DEPARTMENT OE AGRICULTURE, 



BUREAU OF PLANT INDUSTRY— Circular No. 56. 

 B. T. GALLOWAY, Chief of Bureau. 



SOME CONDITIONS INFLUENCING 

 THE YIELD OF HOPS. 



LIBRARY 



^e^v york' 

 W. W. STOCKBERGER, Pharmacognosist, Q'^«De«. 



AND 



JA:^IES THOMPSON, Expert, 

 Drug-Plant Investigations. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1910 



332G3— Cir. ".G— 10 



