168 IXSECTS IXJURIors TO STAPLE CROPS. 



which may be covored with felt or packing, and the 

 windows covered with frames of wire gauze to j)reYent the 

 passage of insects. The floor, wails, and ceilings should 

 be smooth, so as not to afford any lurking-places for the 

 insects, and it would be well to have them oiled, painted, 

 or whitewashed for further security. A coating of coal- 

 tar has been strongly recommended for the latter pur- 

 pose." 



"The value of a cool place as a repository of grain has 

 been known of old, and a building in which any artificial 

 heat is employed is undesirable for grain storage. The 

 'heating' and fermentation of grain, as is well known, is 

 productive of 'weevil,' and this should be prevented by 

 avoiding moisture and by ventilation. 



''TJie storage of grain in large hulk is to be com- 

 mended, as the surface layers only are exposed to infesta- 

 tion. This practice is particularly valuable against the 

 moths, which do not penetrate far beneath the surface. 

 Frequent agitation of the grain is also destructive to the 

 moths, as they are unable to extricate themselves from a 

 large mass, and perish in the attempt. The true granary- 

 weevils (small dark-brown beetles with long curved snouts, 

 similar to the pea-weevil), however, penetrate more deeply, 

 and although bulking is of valtie against them, it is not 

 advisable to stir the grain, as it merely distributes them 

 more thoroughly through the mass." 



Destruction of " Weevil." 



Carhon Bisvlficle.- — '• The simi)lest, most effective, and 

 most inexpensive remedy for all insects that affect stored 

 grain and other stored products is the bisulfide of carbon, 

 a colorless liquid, with a strong disagreeable odor, which, 



