THE BLACK CORN-WEEVIL 73 



enough has been put in the crib, it should be kept 

 in a cool place." 



"Is one treatment enough?" someone asked. 



" Of ten it is if everything is just right when the 

 liquid is put into the crib. Be sure and have the 

 crib ready before you put the gas in. Some people 

 forget and then have to open the crib every little 

 while to fix something that should have been done 

 before. One can soon find out if the first dose was 

 not strong enough ; if not, then a second and stronger 

 one should be given. In most cribs it is best to give 

 one dose in the fall as soon as the corn has been 

 put in, and another in the spring. This should be 

 done on warm days. The crib should be kept closed 

 from twenty-four to forty-eight hours." 



"Can I go into the crib with a lighted lantern 

 when the gas is in?" 



"There is just a bare possibility of an explosion, 

 and we would advise you not to carry fire of any 

 kind near the crib at that time." 



"How do you air the crib when you want to open 

 it again?" some one asked. 



The entomologist answered, "Unless you have a 

 brick crib, or a wooden crib very, very tight, it is 

 not necessary to air it, because the gas will disappear 

 in a day or two. In case of a tight crib, just open 

 the door and the gas will soon disappear." 



"I tell you, gentlemen, this gas business looks 



