9 6 



FUMIGATION METHODS 



slipped through the mortices in the uprights, and are 

 keyed down to force the*top down tight. Nine inches 

 from the bottom of the box put in a false slat bottom, 

 made in sections, so it can be removed to clean out 

 dirt from bottom of box. The chemicals are placed in 

 a little shallow dish and put into the box through the 

 little door, A, which has a shutter keyed up tight to 

 side of box. 



Another handy box, devised by a Canadian nurs- 

 eryman, is made of double matched sheathing with 



FIG. 49 THE OPEN BOX USED IN SOME MARYLAND NURSERIES 

 (ORIGINAL) 



tarred paper between. The top is held tightly against 

 the felt padding by driving the wooden hooks from an 

 upright into a slanting position. The hooks are made 

 of hard wood pieces 1x3 inches, cut so as to hook over 

 the edge of the lid and under the long side strip. The 

 rack in the bottom of the box keeps the trees away 

 from the chemicals and insures a thorough penetration 

 of the gas. This box is shown in Fig. 48. 



A plain box, 6x3 x 2^ feet is very satisfac- 

 tory for small orders. It should be made of two 

 thicknesses of common flooring. The construction is 



