AN I.M PROVED >\ - II \l. 
i9 
and to some extent a disadvantage in practical work. The marking 
on these lines gives us an easy means of determining the distance 
over the top of the tree. Our experience has show n that the distance 
around the tented tree can he measured very accurately by pacing. 
The one whose work, in n regular out lit. i-. to <>l>tain the dimensions 
of the trees, should make several pracl ice trials in advance of Fumiga- 
tion, so as to determine the exact length of his pace, and i<> regulate 
it. if necessary. 
In pacing the dis- 
tance around a 
tree it is well to 
keep far enough 
from the edge of 
t lie tent — say 
from h inches to 1 
foot distant — to 
prevent the body 
from coming into 
contact with it. 
The length of the 
pace should be 
regulated to 2\ or 
8 feet when ap- 
proximating the 
actual distance 
around the tented 
tree, preferably 3 
feel . if the pacer 
can step that dis- 
tance without 
much exertion. 
t ij t .i t y _ Fig. 22.— Difference in the direction taken by gas escaping from an open 
in Hani} tne ais- generator and from one covered with the corrugated lid. (Original.) 
tance paced will 
be slightly greater than the actual circumference of the bent. From 
these two measurements (the distance around and the distance over), 
it is possible to approximate the cubic contents of the t rce. 
SUPPLY CART. 
With this system some change is necessary in the character of the 
vehicle for carrying materials, inasmuch as the measuring of chem- 
icals is conducted at the tree. A two-wheeled handcart of the same 
genera] description as that in use l>y the San Bernardino County 
outfits lias been adopted. The handle of the carl and the arrange- 
ment of the lights have been improved upon: while the use of faucets 
in drawing off the acid and water is also an improvement. One of 
