THE CoNFUSED FLouR BEETLE 93 
8. A convenient method has been devised for treating small 
amounts of flour to kill any eggs or other stages of insects which may 
be present. It has been found that when flour is less than two inches 
deep in pans, it may be slowly heated in an oven until the surface of the 
flour reaches a temperature of 85°C and then, after remaining in the 
oven for thirty minutes longer with the heat turned off, the flour will 
have attained a minimum temperature well above the fatal temperature 
for the beetles while the maximum temperature is well below one which 
will cause injury to the cereal. 
