FUMIGATION WITH CARBON BISUIyPHID 271 



elevator legs, machines, and other places where the 

 pests usually congregate in great numbers. Spraying 

 or throwing the liquid broadcast into badly infested 

 corners, on machines, and other pieces of apparatus 

 where the pests are particularly abundant, has been 

 attended with very good results. 



Time to do the work, Saturday afternoon is the best 

 time for fumigating a mill or large building. After 

 sweeping from top to bottom, all fires about the premises 

 should be extinguished and the building closed as 

 tightly as possible. The vessels and cotton-waste 

 should be previously distributed, so there will be no 

 unnecessary delay. The number and distribution of 

 the vessels will depend, as already stated, upon the con- 

 dition of the mill and the severity of the attack. It is 

 best to begin with the lowest story and work upward. 

 The operators can then keep above the settling gas. 

 When the bisulphid has been applied throughout the 

 mill it should be locked and kept closed until the fol- 

 lowing Monday morning. All windows and doors 

 should then be thrown wide open and the building 

 allowed to air an hour or more before fire is started in 

 it. Where the building is large and a great quantity 

 of material has been used, it is wise to have a watch- 

 man stationed outside to prevent any one from entering 

 or loitering about the building during fumigation. 



Practical application. As a guide to those who may 

 use this method, I quote several letters from practical 

 millers who have used carbon bisulphid successfully. 

 The superintendent of a large Pennsylvania milling 

 company, whose name I withhold by request, wrote me 



