MUSHROOM PESTS AND THEIR CONTROL 5 



burning sulphur within the houses, and that the time required for 

 burning averages about 3 hours. In burning sulphur within the 

 houses a uniform concentration is rarely if ever obtained, as the hot 

 sulphur dioxide gas from the pans rises to the top of the house. By 

 the time the gas has cooled sufficiently to settle to the floor the total 

 concentration of sulphur dioxide gas within the house has reached 

 a point too low to be of much value. There is also considerable 

 hazard of fire in burning sulphur within the houses by the methods 

 now commonly used. 



AN EFFECTIVE! DEVICE FOR BURNING SULPHUR 



The use of the sulphur burner described below has been found by 

 experimentation to be an improvement over the methods now in com- 



Figure 1. — A., Outside sulphur burner in operation, with door closed and fan con- 

 nected ; B, outside sulphur burner with door open to show arrangement of pans. 



moil use for fumigating mushroom houses with sulphur. It produces 

 a highly concentrated gas in the house with less than one-third of 

 the quantity of sulphur required by the pan method, burns the sul- 

 phur completely within about 30 minutes, reduces the fire hazard, 

 and gives completely uniform distribution of the gas within the 

 house. The details of construction are shown in figures 1 and 2. 



