Insect Enemies. 105 



soil would be destroyed, were the temperature raised 

 sufficiently to kill the first. Dr. Halstead tells us frost 

 will kill them. If this is the case, let those who are 

 troubled Avith them to an extent endangering their 

 crop, try this method of prevention. To do it effectu- 

 ally, prepare the soil pile in the usual way, but do it in 

 the summer, and early enough to admit of turning 

 once or twice. With the appearance of winter, spread 

 out the pile'thin enough to have it freeze solid. After 

 this has taken place, the soil can again be gathered in a 

 pile. Should a trial prove this to be a sure j)revent- 

 ive, it wovild pay to erect an open shed under which to 

 spread and freeze the soil, and thus prevent it from be- 

 ing leached by the fall and winter rains. If there is 

 any suspicion of their presence in the manure, the same 

 method should be used with that also. This is, of 

 course, practicable only in latitudes where freezing 

 weather prevails. The writer already quoted gives it 

 as his opinion that the greater prevalence of this trouble 

 the past two years, is to be attributed to the fact that, 

 during that time, the winters have been unusuallj' 

 mild in sections where the most complaint is heard. 

 IVere I troubled with this pest I should certainly give 

 this method of preventibn a thorough trial, and I trust 

 those who are will do so the coming season, if they are 

 located in sections where the elements will come to 

 their aid. This I know will entail quite an additional 

 amount of work, but it seems to be a case similar to 



