26 FUMIGATION INVESTIGATIONS IN CALIFORNIA. 
around and over a given tree being known, the table will show the 
approximate cubic contents of the tented tree. The dosage can then 
be applied in proportion to the contents and at any strength desired. 
A lemon tree, after being pruned, is ilat on the top. Therefore 
we can not consider the geometrical figure which is applicable to an 
orange or unpruned lemon tree as also applicable to a pruned or flat- 
topped lemon tree. The figure which approximates the latter i> a 
cylinder. Xow it so happens that the contents of a cylinder having 
certain dimensions over its top and around its bottom are almost the 
same as for a figure of the same dimensions composed of a cylinder 
surmounted by a hemisphere. This is a great advantage inasmuch 
as the schedule of dosage proposed for orange trees may also be used 
for all lemon trees, thus obviating the necessity of preparing two 
different schedules. 
METHODS FOR OBTAINING THE MEASUREMENTS AND DOSAGE OF TREES. 
WITH APPARATUS. 
Of the various methods suggested for obtaining the measurements 
of tented trees, the first was naturally by the use of a tapeline. It 
was an easy matter to ascertain the distance around the tent with a 
tape, but to measure the distance over the top was much more diffi- 
cult. This required the services of two men and repeated efforts. 
For field work on a commercial scale this was impracticable. 
Woodworth explains a method of securing measurements, which 
consists in the use of a fishing rod and a wire line, the latter marked 
off by knots into 1-meter lengths. His description of this method 
is as follows: 
Having first attached the line at about its middle to the end of the rod, one end 
of the former is made fast to the tent. The most convenient way to accomplish 
this was found to be by means of a hook, like a fishhook from which the barb had 
been removed. The most convenient place of attachment was at a point 1 meter 
from the ground. 
After attaching one end of the line to the tent the rest of that half is caused to lie 
up to and over the center and top of the tent by means of the rod. The one making 
the measurement then walks around to the opposite side of the tent, rod in hand, 
holding the line constantly in position over the top. The other end of the line is 
carried around the tent at the same time and is then drawn taut, measuring the lasl 
fraction of a meter by means of the graduation on the lower joint of the rod. Adding 
now 1 meter, the distance the first end is from the ground, we have the measurement 
of the distance over the top of the tenl from the ground on cue side to the ground 
on the other. 
A second measurement was then taken by throwing the line off the top of the tenl 
by means of the rod and holding it so that as the measurer proceeds around the tent 
to the point where the line is attached, it will encircle the tent at a point about 1 
meter from the ground. The end of the rod is again brought into requisition and the 
last fraction of meter read in centimeters. 
Both measurements are thus made by one person in a single trip around the tent. 
"Bui. 152, Univ. of Cal. Agr. Exp. Sta., 1903. 
