306 AGRICULTURE. 



cigar, or even a spark of fire, be brought near 

 the fumes. 



For storehouses, bins, etc., place the liquid in 

 small, shallow dishes. These should be placed 

 near the top of the bin, since the fumes of car- 

 bon bisulphide are heavier than air. This bin 

 should be kept tightly closed for twenty-four to 

 forty-eight hours, and then well ventilated. 

 The amount of the liquid used should be in the 

 proportion of one pint to one thousand cubic 

 feet of space. For destroying root pests, small 

 vertical holes should be made in the soil around 

 the plant. Into each hole pour a teaspoonful of 

 the carbon bisulphide and cover at once. Car- 

 bon bisulphide is also useful in protecting furs 

 and clothing, since it volatilizes and leaves no 

 stain. The odor is so disagreeable and pene- 

 trating that the clothing must be well aired for 

 several days before wearing. 



Of the contact insecticides that kill by cor- 

 roding the body of the insect, those most com- 

 monl)- used are lime, soap, and carbolic acid. 

 These are effective on soft-bodied insects, lime 

 being, perhaps, the most important. Lime is 

 useful both as a preventive and a remedy. It 

 may be applied dry as a dust or as a whitewash. 



Some of the contact insecticides — as, kerosene 

 emulsion and carbon bisulphide — are equally ef- 

 fective upon biting and sucking insects, since 

 they kill by suffocation. 



