INJURIOUS INSECTS 123 



These readily form an emulsion when thoroughly 

 churned together. It should be used the same as other 

 soap and kerosene emulsions mentioned. Sweet milk does 

 not emulsify readily, but if a little sour or even if very sour 

 it unites easily with the kerosene. This is the best emulsion 

 where the water is very hard. 



Carbon bisulphide is a very inflammable material which 

 has a disagreeable odor and which readily vaporizes. It 

 should be handled with the same precaution as gasoline, 

 which resembles it in appearance. The fumes that it gives 

 off are very heavy and are poisonous to animal life when 

 confined with it. On account of these properties it is used 

 for killing weevils in grain or peas, beans, and other seeds, 

 and for killing gophers, mice, or other creatures in their 

 holes. The method of using it for grain weevils is to fill 

 a barrel or other tight receptacle nearly full of seed ; then 

 sprinkle on an ounce of the liquid for each one hundred 

 pounds of seed and cover the vessel tightly for several hours. 

 It does not hurt the grain, which is just as good and looks as 

 nice as ever after being treated. The germinating qualities 

 of the seed are not injured by this treatment. When 

 used for killing moles, gophers, and mice, the material 

 should be put on cotton or other absorbent and placed in 

 their holes, which should then be closed with earth. 



Catching Insects by Light at Night. By suspending a 

 lantern at night over a tub of water having its surface 

 coated with kerosene, many night-flying insects can be 

 destroyed. Among those that can be caught in this way 

 are cut-worm moths, the clicking beetle (which is the 

 mature form of the wire worm), and the May beetle (which 

 is the mature form of the white grub). When these insects 

 become especially abundant, this method of catching them 

 is worthy of trial. The objections to it are: (1) It is the 



