60 



aminecl at least once a mouth, and if there appear signs of 

 insects, it should receive another application. Then in the 

 spring, before the grain is taken out for planting, it should 

 always receive an application of bisulphide of carbon, to be 

 sure that all'insects are destroyed and thus prevented from 

 attacking the grain in the field and multiplying there. 



The bisulphide of carbon is best, or at least as well, ap- 

 plied by sprinkling it over the top of the grain. It will soon 

 evaporate, and as the fumes are heavy they will penetrate 

 through the grain. The germinating properties of grain are 

 not injured in the least by any ordinary application. Some 

 may prefer to saturate cotton with the bisulphide and place 

 it in the grain, or to fill shallow dishes and place them about 

 the granary. No harm can result, however, from sprinkling 

 the bisulphide directly on the grain, since it evaporates 

 almost immediately, and if pure, leaves no trace of it on the 

 grain. One can test the bisulphide of carbon to determine 

 whether it is pure or not, by dipping a black feather in it and 

 allowing it to dry ; if the bisulphide is pure no residue will 

 be seen. 



The only precaution in the use of bisulphide of carbon is 

 not to have the least trace of fire about ; the fumes are very 

 explosive and will ignite from a lighted cigar or lantern. • 



Bisulphide of carbon evaporates so rapidly that it will 

 disappear in a few moments, if some of the grain be removed 

 to the open air. 



It is not necessary to mention any other remedy for in- 

 sects in stored grain as the above is much superior to all 



others. 



J. M. STEDMAN, 



Biologist. 



