INSECTS AND INSECTICIDES 381 



material should be placed in tight bins lined with tarred paper 

 and with the seams painted. The carbon bisulfid is used at 

 the rate of 2 pounds for each 1000 cubic feet and the fumigation 

 is continued for forty-eight hours. 



The carbon bisulfid is placed in shallow tin pans on top of 

 the material to be treated. The vapor is heavier than air and 

 will be gradually diffused through the mass. Fumigation with 

 this material is more effective if the temperature is kept near 

 70 degrees F. At lower temperatures the insects are less active 

 and much more difficult to kill. 



