30 



cautious. There is, moreover, no danger that the vapor will injure the 

 peas or render them unsafe as food. Experiments have shown that 

 the liquid can even be poured upon articles of food, and, after 

 thorough exposure to the air, not a trace of it will remain. 



Fumigation Box. The fumigation box which has been in use in 

 the Experimental Department for seven years for killing the pea 

 weevil by the carbon bisulphide process is well illustrated by the 

 accompanying diagrams ( Fig. 7 ). The box is rectangular m form, 



Fig. 7. Fumigation box used in the Experimental Department at the O.A.C. The method 

 of construction is readily seen. (Original.) 



being five feet long, two and four-iifths feet wide, and three feet 

 high, and capable of holding about thirty bushels of peas at one 

 time. It is made of pine lumber, 1^ inches thick, tongued and 

 grooved. The end pieces are mortised into the sides. All the joints 

 are made very tight by the use of white lead. The cover is lined 

 with a strip of cloth and is made to fit very closely. 1 his box has 

 been used for the double purpose of fumigating peas to kill the 

 weevils, and of dipping sheep to kill the ticks. 



Coal-Oil Barrels. When a box such as we have described, is 

 not readily made or procurable, one or more coal- oil barrels may be 

 used. These are water-tight, and may be covered with a blanket and 

 a close fitting cover, upon which may be placed some heavy stones. 

 Fig. 8 shows the method of using barrels for this purpose. A barrel 

 will hold about five bushels ; and for this quantity of peas, three to 

 four ounces of carbon bisulphide are necessary. 



This method of treatment is valuable for small quantities of seed 

 peas, but would hardly be adopted when the entire season's crop is to 

 be fumigated, as it would necessitate either a very large number of 

 barrels, or an extended period of fumigation with a few barrels. 



