130 FUMIGATION METHODS 
Flow to prepare the jar.—The chemicals should be 
prepared strictly in accordance with dire¢tions given 
in Chapter II. An earthenware crock or jar will be 
needed, the size of the vessel depending upon the 
capacity of the enclosure. The number of vessels 
needed will depend upon the size of the house to be 
fumigated. Ina small-sized house single jars may be 
sufficient, but as arule it is desirable to use two or 
more crocks or vessels. After the acid and water have 
been mixed and placed in the vessels, the cyanide, 
which has been previously weighed and wrapped in 
strong manila paper bags, is suspended over the crocks, 
as shown in the illustration. 
Several hooks or screw-eyes can be used conve- 
niently to carry the string from the door to the vessels. 
There should be as many lines of string as there are 
vessels, each one leading to the door or outside open- 
ing. as shown in Fig. 70. If the building requires. 
four pounds of cyanide and two jars are to be used, it 
is desirable to divide the cyanide into equal parts. 
Before the acid and water are placed in the jars, it is. 
well to tie the bags of cyanide to the cords and see 
whether or not they work satisfactorily. Care should 
be taken to see that the bags when lowered will go: 
into the crocks, and thus into the chemicals, without 
difficulty. 
At times it is necessary to use some protection 
around the jars to prevent the injury of the foliage in 
case plants are too near. A section cut from a roll of 
building paper can be used to good advantage, as the 
paper rolls in a tube and can be placed around the 
vessel, thus keeping the acid and water from spattering 
