492 FRUIT IN. SECTS 



thin paper bag, and when all is ready, drop it into the liquid 

 and leave the room immediately. 



Dormant nursery stock may be fumigated in a tight box or 

 fumigating house made especially for the purpose. Fumigating 

 houses are built of two thicknesses of matched boards, with 

 building paper between, and are provided with tight-fitting 

 doors, and with ventilators. The stock should be reasonably 

 dry to avoid injury, and should be piled loosely in the house to 

 permit a free circulation of the gas. Use 1 ounce of potassium 

 cyanide to each 100 cubic feet of space, and let the fumigation 

 continue 40 minutes to one hour. 



