3 
it is therefore unnecessary for the tape to pass over the highest twigs. 
For large trees 6 to 8 feet should be added to the number of feet over 
the top of the tree, as shown by the measurement, and for small trees 
4 to 6 feet should be added. In general, trees from 10 to 15 feet 
high require tents between 32 and 44 feet in size*; trees from 16 to 20 
feet high require tents 44 to 58 feet in size; trees 21 to 25 feet high 
require tents 60 to 70 feet in size; and trees 25 to 30 feet high require 
tents 70 to 76 feet in size. 
In regard to the number of tents required, it is safe to estimate 
that with one tent for each 100 trees the work of fumigation could 
be completed in ten to four- 
teen nights’ work. One crew 
can handle from twenty to 
twenty-five small tents, 45 
feet in size and smaller, and ‘i 
from eight to fifteen tents, 50 [Bie site ent i 
feet insize and larger. Much |REQ@WwhiAh Gs Htviren tt tah tn 
depends upon the trees being |r KIDS ; 3 4 
so spaced as to obviate inter- 
ference with the work of shift- 
ing the tents. 
Having decided upon the 
number and sizes of tents 
required, orders should be 
placed as soon as_ possible. 
Samples of 8-ounce army duck 
should be obtained from tent 
and awning makers who are 
in a position to furnish the 
tents. The selection of tent 
material is a matter of great . : 
importance. Samples of duck Fie. ac pee and a desirable type Ob ee: cot- 
‘ z on duck for fumigating tents. (Original. ) 
can be classified roughly in 
regard to tightness by the general texture and by the degree of 
imperviousness to direct rays of light when held between the eye and 
the sun, or any bright light. Neither of these methods is entirely 
satisfactory, however, in selecting material for fumigating tents. 
With a simple arrangement devised by the authors for testing the 
tightness of material submitted to the laboratory at Orlando, Fla., for 
examination, it has been found that samples of duck vary nearly 50 
per cent in their comparative tightness. 
Figure 1 illustrates two extreme samples of 8-ounce duck which 
differ to the extent of 47 per cent in this respect. As a result of 
ay 
« 
‘ 
, 
ae 
ayant 
3 5 
hd 
by eet 
a7The size of tents is expressed in terms of the distance between parallel sides of 
the octagonal sheet of canvas of which the tent is composed. 
(Cir. 111] 
