70 CALIFORNIA CITRUS CULTURE. 
that the United States Department of Agriculture set experts to work 
out a reliable and uniform system of procedure. Dr. A. W. Morrill 
inaugurated our present system of marked tents and a system of dosage, 
which is known as ‘‘The Morrill System.’’ This work was done in 
Florida. Later Mr. R. 8. Woglum began operations in California and 
greatly perfected this system so as to make it at once practical and 
available to all the orchardists. 
TENTS. 
Shape. In order to conform as near as practicable to the form of 
a tree, fumigation tents are made in the shape of an octagon (8-sided) 
Fic. 47.—Showing shape and method of marking tent. (U. S. Dept. Agrcl.) 
(Fig. 47). If the tents were square the corners would be a constant 
and unnecessary annoyance. 
For small trees bell tents were formerly made by cutting the tents 
circular and sewing a strong hoop around the bottom. Such tents are 
seldom if ever used at the present time. 
Size. The size of a tent naturally depends upon the size of the tree. 
