FUMIGATION OF CITRUS TREES. 



29 



THE MORRILL METHOD. 



In figure 7 is shown an outline of a regulation fumigating tent 

 marked after the Morrill system. Three parallel lines and one line 

 at right angles to them are indicated on the tent. The middle one 

 of the three parallel lines passes through the central point in the tent 

 canvas, running lengthwise of the central section or strip of which 

 the tent is made and passing over the top of the tent from the edge 



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Fig. 7.— Outline of a sheet fumigation tent marked according to the Morrill method. (Author's illustration.) 



on one side to the edge on the opposite side; these lines also run in 

 the direction in which the tent should be pulled on or off a tree. 

 Beginning at the center these lines are graduated in feet toward 

 either edge of the tent, after the manner shown in the diagram. 

 For tents above 36 feet (average size) it is unnecessary to commence 

 the graduation nearer than 5 feet from the center of the canvas. 

 When one of these lines is over the middle of the tree the distance 

 over can be calculated by merely adding together the two numbers 

 on the opposite sides of the tent where the edge touches the ground. 



