270 FUMIGATION METHODS 
in the hole the box is ready for use. In placing it 
over a plant, be careful that the edges set firmly into 
the dirt. Remove the stopper, add the desired amount 
of liquid, and close it quickly. 
Fumigation of mills and other buildings.—Carbon 
bisulphid can be thrown directly upon grain without 
injuring its edible qualities, and will not effe¢t its vital- 
ity in the least. In mills it can be used about the 
machinery, spouts and elevators with perfect assurance 
that the manufactured products will not be damaged. 
I know of no instance where the slightest deleterious 
effect has been realized by persons applying it in mills, 
although they unavoidably inhale some of the fumes. 
The amount of liquid to be used depends (1) on the 
size of the building, (2) on its tightness, and (3) on 
the magnitude of the attack. Where the building is 
reasonably tight and but slightly infested, one pound 
of carbon bisulphid is sufficient for every thousand 
cubic feet of air-space enclosed. If it is somewhat open 
or badly infested the amount should be doubled. When 
applied to bins containing stored grain, one pound of 
liquid to every hundred bushels of grain is commonly 
used ; but if the insects are very abundant, twice this 
amount should be used. 
Methods of application.—A number of ways for using 
carbon bisulphid have been suggested and tested. ‘The 
most effective manner of applying it in mills consists in 
simply pouring the liquid into shallow dishes, such as 
soup-plates, pans, or wooden vessels, and distributing 
them about the building. Bits of cotton-waste satu- 
rated with the liquid should also be thrust into spouts, 
