Il6 FUMIGATION METHODS 



thrown up beneath the hood the shelf is tipped and 

 the cyanide dumped info the generator. This device 

 is simple and cheap. 



A good Western idea. A Western firm has a 

 novel and practical way of making an open floor and 

 generating the gas underneath. They say : ' ' Our 

 fumigating house is 15x20x10 feet. The walls are 

 double, of one-inch plank, the first course being put 

 on lengthways of building, then common building 

 paper, tarred after being put on. The second course 

 of plank is put on up and down. This course is on 

 the outside ; roof made the same way ; doors simi- 

 larly made, are double, and take up one end of the 

 building. After the building was completed, we 

 banked up around the bottom about a foot with dirt ; 

 then we excavated about a foot and a half deep, one 

 foot from the bottom of the walls. For instance, if 

 the room was 10x20 feet, the excavation would be 

 9x19 feet, surface measure. Over this excavation is 

 laid three 2x4 inch joists, just enough to hold the 

 stock which is put in for fumigating. Across these 

 joists lay two or three 1 2-inch planks, loose. This 

 completes the house. 



* 'An opening or flume is made under the wall about 

 one foot deep and eighteen inches wide. The end 

 extending into the inside of the building is open, and 

 extends just far enough to let the gas into the exca- 

 vation under the trees. The outer end extends out 

 far enough to give the operator ample room to insert 

 the vessel containing the chemicals. The outer aper- 

 ture is covered with a trap-door. The vessel with the 

 acid and water is set in the flume, trap- door open, and 



