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FUMIGATION INVESTIGATIONS IN CALIFORNIA. 
In figure 11 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 on one side to the edge on the opposite side; these lines 
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Fig. 11. — Outline of a fumigation tent marked according to the Morrill system. 
also run in the direction in which the tent should be pulled on or ofT 
a tree. The single line at right angles to the parallel lines passi - 
through the central point, as does the middle one of the three parallel 
lines, and extends also from the edge on one side to the edge on the 
opposite side. 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 
