U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 220. 



B. T. GALLOWAY, Chief of Bureau. 



RELATION OF DROUGHT TO WEEVIL 



RESISTANCE IN COTTON. 



O. F. COOK, 



Bionomist in Charge of Crop Acclimatization and Adaptation Investigations. 



Issued August 7, 1911. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE- 



1911. 



