64 
FLORIDA STATE HORTICULTURAL SOCIETY. 
tion. First, the dosage should be care¬ 
fully estimated and a so-called ^‘sched¬ 
ule’' prepared showing the location of 
each tree and the amount of cyanide 
which should be given in each case. 
The work done by the agents of the 
Bureau of Entomology during the past 
season has not been completely sum¬ 
marized as yet, and it is therefore im¬ 
possible at this time tO' present a table 
of required dosage for trees of different 
sizes. Before definite recommenda¬ 
tions of this kind be made, it is desir¬ 
able that further experiments be con¬ 
ducted with tents treated by different 
methods. A general idea of the 
amount of potassium cyanide required 
with an untreated tent of eight-ounce 
duck, can be obtained from the follow¬ 
ing table which‘includes only a few 
examples selected from the many rec¬ 
ords : 
Example of results obtained with 
exposure of 45 minutes. 
Distance Over 
Top of Tent. 
Circumference of 
Tent at Base. 
Potassium cya- 
nideused (ounces) 
Per Cent, ol Lar* 
vae and Pupae 
White Fly Destroy 
45 
50 
20i 
99.8 
m 
60i 
26 
98.9 
47 
5H 
22 
99.5 
36i 
48 
21 
100 
44i 
58 
27 
100 
50i 
56 
36 
100 
The measurements of a tent are eas¬ 
iest made by means of a tape measure 
attached to a reel. The measurement 
of the circumference is made within a 
few feet of the ground. To obtain the 
distance over, the end of the tape is 
held in one hand while the reel is 
thrown over the center of the tent 
and the measurement made from, 
ground to ground. Tables will be 
prepared in due course which will 
show the proper dose for trees of va¬ 
rious sizes, but with a little experience 
in calculating the dosage from actual 
measurement, a fumigator should be 
able to estimate the amount of potas¬ 
sium cyanide with sufficient accuracy. 
In each outfit, from two to five men 
are employed according to the size of 
the trees. For medium sized trees up 
to 22 feet in height, four men can 
work to advantage. This crew can 
handle thirty tents every forty-five 
minutes, and can treat about 400 trees 
in a night’s work of ten hours. For 
trees from 23 to 35 feet in height, der¬ 
ricks or uprights are used, and a crew 
of five men are needed to handle about 
12 or 15 tents every forty-five minutes. 
The changing of the bell or hoop 
tents from one tree to another is a sim¬ 
ple procedure, requiring but a few sec¬ 
onds’ time for two men. Sheet tents 
are placed in position over the trees 
up to about 22 feet in height by means 
of the changing poles described, and 
require from less than a minute up to 
a minute and a half for each tree. 
Trees from twenty-twO' to thirty-five 
feet in heiglit can easily be covered by 
means of the derricks or uprights. The 
uprights being placed in position, the 
tent is raised by means of the pulley 
attachments, the uprights are then 
pulled forward by means of a rope at¬ 
tached to the top, and as they fall the 
tent is pulled over the tree. The cov¬ 
ering of the largest trees can be ac¬ 
complished in between one and two 
minutes. It is readily seen even from 
this brief description, that the mechan¬ 
ical difficulties involved in this process 
are insignificant when compared with 
the labor required for spraying and in 
addition, it lacks the many disagreea¬ 
ble features which always accompany 
the application of liquid insecticides. 
With the schedule before them, the 
