COMPUTING VOLUME and DOSAGE FOB TENTED CBEES. 25 
necessary to determine by an extensive series of experiments the 
dosage required for different-sized tree- for the various scale pots 
infesting the citrus orchards. 
METHOD OF COMPUTING VOLUME \\i> DOSAGE FOB TENTED TREES. 
Although most citrus trees possess a certain genera] similarity id 
shape, they are nevertheless somewhat irregular, no two ever being 
identical in all respects. This renders it impracticable to determine 
the exact contents o( any giveD tree. For field work, however, this 
i> unnecessary, and all that is Deeded is to approximate it with a 
fair degree of accuracy. In order to calculate the cubic contents of 
an object, it must be considered as shaped like .some regular geomet- 
rical figure or figures. The figure which most closely approximates 
in shape an orange or lemon tree before it lias been pruned 1^ a cylin- 
der surmounted by a hemisphere, and in computing the volume we 
have considered them of this shape. 
If we know the height and width of a tree covered with a tent, it 
is a comparatively simple matter to calculate its contents. 
In the past in California work the dosage has been based upon 
these two measurements. After a tree is covered with a tent it is a 
matter of some dilhcult y to determine the height and the width. By 
using as factors the distance around the bottom of the tent and the 
longest distance over the top of the tent we arrive at a more prac- 
ticable method by which to compute the cubic contents of a given 
tree. Using these measurements as a basis the writer has invented 
a formula a by means of which the cubic contents of a tree may be 
computed. To avoid computation work in the field as far as possi- 
ble, the writer has formulated a table approximating the cubic con- 
tents of trees of different dimensions, which is, he believes, suffi- 
ciently extensive to include any eitrus tree in southern California. 
During tins investigation no tree has been found whose dimensions 
did not fall within the limits given in this table. The distance 
a Professor Wood worth (Bui. 152, Univ. of Cal. Agr. Exp. Sta., p. 5, 1903) was the 
first to propose a formula for obtaining the contents of tented trees by computing the 
distance around the bottom and over the top. An analysis of this formula during 
the early part of the writer's field work proved that it was inaccurate, thus necessi- 
tating the determination of a new formula. The writer has worked out a formula 
based od the two measurements above mentioned, it is as follows: 
r- ( <> C(3k-4) x 
-1-^2 L2;r J 
In this formula C=the cireumforenec of the tree. 
= the distance over the top of the tree. 
C° C(3r I) 
If a person work- oul and notes down in a charl the values of r- and -^7) — 
for different valuesoi ( of which beisapl to make common use, ii is possible by its 
use in connection with the formula to determine the contents of trees with fair 
rapidity. 
