CIRCULAR 3 6 9, U. S. DEPARTMENT OF AGRICULTURE 



Figure 4. — A vacuum fumigating unit in a large general-merchandise storage warehouse. 

 Since it is located along the railroad siding, susceptible commodities are fumigated 

 as they are unloaded from the freight car and before they are placed in storage 

 rooms, where only fumigated supplies are stored. 



Figure r>. — Commodities of various types assembled for export on a modern dock. 

 Carload lots of supplies found slightly infested upon arrival by rail are sometimes 

 fumigated beneath rubberized tarpaulins. While such treatments are not always 

 entirely satisfactory, they are resorted to in numerous instances. 



