HEATED ROOMS 67 



extended to the outside of the house, so that the cyanide can then 

 be lowered into a jar while the person is on the outside of the house. 



When a large greenhouse is to be fumigated, it would be well 

 to have several jars, so that the gas will be thoroughly distributed 

 throughout the greenhouse. 



If heavy bags are used for the cyanide, the jars can be placed 

 in order and a bag placed beside each jar. When all is ready, move 

 rapidly along the row of jars, placing the bags in the acid, and leave 

 the house at once. 



Ventilators should be arranged in such a way that they can 

 be opened from the outside to air the house. 



One should be careful to remove cats or any other pets from 

 the house before the fumigation is started. If the cat is forgotten, 

 one should not go into the house to get it after the cyanide is 

 started; in fact, under no circumstances should the house be 

 entered after the fumigation is started until such time as the house 

 has been thoroughly ventilated. 



Directions for Using Sulfur. Rooms should be made tight by 

 stuffing all cracks or pasting paper over them. Iron, steel and 

 nickel are also attacked by sulfur fumes. Nickel fittings and gilt 

 frames, copper, silver and steel utensils should be removed, though 

 metal may be protected by smearing it with vaseline. Use two to 

 three pounds of sulfur for every thousand cubic feet. Place vessel 

 holding sulfur in a larger dish of water. A half pint of wood alcohol 

 mixed with the above amount of sulfur will cause same to burn 

 freely; or sulfur candles may be used. 



Heated Rooms. Most insects, particularly those in mills, will 

 succumb if exposed to a temperature of 123 to 125 degrees F. for 

 several hours. Dean, of Kansas, first demonstrated this with mill 

 insects, and where such temperature can be safely maintained in 

 mill, warehouses, or dwelling it is recommended. 



QUESTIONS 



1. Describe the method of fumigating grain or seed with carbon bisulfid. 



What precautions must be observed? 



2. Describe methods of fumigating a greenhouse with hydrocj'anic acid gas 



and tell what precautions should be observed. 



3. How is nursery stock fumigated? 



4. Give directions for the use of sulfur as a fumigant. 



5. Enumerate the dangers in the use of hydrocyanic acid gas and tell what 



precautions should be observed in its use. 



6. In what ways is fumigation with bisulfid of carbon dangerous and what 



precautions are to be observed? 



7. What are the qualifications of a good spraying outfit? 



8. What precautions are necessary in preparing and applying a liquid spray? 



9. What are the objections to spraying fruit trees while in bloom? 



