1 66 FUMIGATION METHODS 



indication of the peach^pit odor, the enclosure should 

 not be entered until after it has disappeared. 



Residue in vessels. The material left in the vessels 

 after fumigation should be handled carefully. It is an 

 excellent fertilizer, and can be used for that purpose if 

 composted with earth or other material. Where 

 available, it can best be utilized by throwing it upon 

 a manure pile. Wash quickly in cold water, if by 

 accident the acid is gotten upon the flesh. The 

 chemical composition and value of the residue is given 

 fully in Chapter II. 



Cars and ships. Not infrequently railroad coaches, 

 street-cars and ships become badly infested and over- 

 run with vermin of various sorts. Such enclosures 

 can be readily fumigated with hydrocyanic acid gas by 

 following the directions given herewith. In South 

 Africa some railroad companies have found it 

 expedient to fumigate their passenger coaches to 

 keep them free from bedbugs and other pests. 

 Very often ships are overrun with cockroaches, fleas, 

 bedbugs, etc. The gas can be supplied in such places 

 with perfect success for the total destruction of the 

 vermin. In any case whatever enclosure is to be 

 fumigated the same precautions and methods for 

 handling and generating this gas should be observed. 



Dwelling-houses and storerooms. This gas can also 

 be used with perfect safety in the hands of an expert 

 in dwelling-houses or storerooms infested with the 

 ordinary household pests. In such cases, however, 

 great care should be taken in handling the material, 

 and no person should be allowed to remain in the 



