168 SOME sol 111 INDIAN INSE< h. ETC. [CHAP. Will. 



turned on under pressure. A temperature of 118 to [25 degrees 



Fahrenheit is claimed to he sufficient to destroy all insect lite and 

 this may be so in countries where, even though the kinds of insects 

 concerned may be identical with Indian ones, the average tempe- 

 ratures to which the individual insects have been exposed for gene- 

 rations are considerably lower than the limits given above In 

 India, where temperatures run much higher, it is probable that the 

 insects would only be killed off by the temperatures considerably 

 in excess of I20 j c\cti it methods of heating were available. The 

 treatment of stored products by cold so as to prevent insect pests 

 from breeding and doing damage is not practicable in India in the 

 case of grains which are attacked on a large scale, though perhaps 

 possible in the case of cigar factories and similar industries where 

 th. produi ts are of considerable value and small bulk. 



