1913.] PUBLIC DOCUMENT — No. 31. 179 



moiit witli most of tlicin is so great as to rciulcr thorn unavail- 

 able for largo areas. Finally, the most promising line of inves- 

 tigation seems to be the discovery of something which will 

 effectnally repel the insects or destroy the maggots, and which 

 can be ai)plied either as a part of the i)lanting process or in 

 connection with cultivation, thns avoiding the necessity of spe- 

 cial treatments by combining these with usnal methods of culti- 

 vation. Experiments along these lines are now being planned. 



