U. S. DEPARTMENT OF AGRICULTURE. 

 BUREAU OF PLANT INDUSTRY— BULLETIN NO. 183. 



B. T. GALLOWAY, Chief of Bureau. 



FIELD STUDIES OF THE CROWN-GALL 



OF THE GRAPE. 



BY 



GEORGE G. HEDGCOCK, 

 Pathologist, Frlht-Disease Investigations. 



Issued July 23, 1910. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1910. 



