1913.] PUBLIC DOCUMENT — No. 31. 179 



ment with most of them is so great as to rentier them unavail- 

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

 tigation seems to be the discovery of something which will 

 effectually repel the insects or destroy the maggots, and which 

 can be applied either as a part of the planting process or in 

 connection with cultivation, thus avoiding the necessity of spe- 

 cial treatments by combining these with usual methods of culti- 

 vation. Experiments along these lines are now being planned. 



