22 FARMEES BULLETIN 846. 



ent time give apparently satisfactory results. By this method the 

 cigars in sealed boxes, ready for shipment, are subjected to Roentgen- 

 ray radiation of great power and intensity. Recent improvements 

 in apparatus have made possible exposures which could not be 

 obtained readily or were not practicable in commercial work with 

 earlier forms of apparatus.^ 



1 A detailed report of experiments made by the writer with X rays has been published 

 in the Journal of Agricultural Research, Vol. VI, No. 11. "Effect of Roentgen rays on 

 the tobacco or cigarette lieetlc and the results of experiments with a new form of Roent- 

 ' gen tube." Washington, Government Printing Office, 1916. 



