26 FUMIGATION" INVESTIGATIONS IN CALIFOENIA. 



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 flat 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 is a 

 cylinder. Now 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 w^as much more difh- 

 cult. This required the services of two men and repeated efforts. 

 For field work on a commercial scale this was impracticable. 



Woodworth'^ explainr 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 last 

 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 tent from the ground on one side to the ground 

 on the other. 



A second measurement was then taken by throwing the line off the top of the tent 

 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. 



a Bui. 152, Univ. of Cal. Agr. Exp. Sta., 1903. 



