122 FUMIGATION METHODS 
water, together with a cup or glass for dipping, should 
be kept close at hand. 
Cellars and cars.—It is not desirable to attempt to 
fumigate trees after they are packed in cellars or cars. 
In some cases serious injury has been done when trees 
were fumigated in freight-cars after being packed. 
Asa rule, the roots are so closely packed with moss 
and other materials when put in cars it is difficult 
for the gas to get to them. It is practically im- 
possible to properly ventilate the car afterward, and 
more or less gas is left. The only proper place to 
treat trees is in the fumigatorium. 
Canvas over wagon.—An enterprising nursery firm 
in Utah uses a canvas sheet over a wagon loaded with 
trees, in addition to the use of a house. They give the 
following description of house and method of handling 
tent: ‘‘ For a number of years we used a small room 
about 12 x 12 feet. Finding this too slow a process, 
we put up a building 22x 56 and 9g feet high. The 
roof and entire building is made with two thicknesses 
of 1 x 12 feet boards, with building paper between, 
which makes it very tight. As this was rather large 
for ordinary use, we made a partition, making the 
smaller room 22 x 20. ‘This latter room we use mostly 
when we store our stock inside to be treated. 
‘* We think, however, by far the better and more 
economical method is to do the fumigating on the wagon 
at the time stock is dug and hauled in. This is done 
by using a canvas sufficiently large to cover the entire 
load, with a few feet of margin, which should be spread 
on the ground and weighted down to keep the fumes 
