76 CALIFORNIA CITRUS CULTURE. 
MEASURING THE TENTS. 
The air space of the tents is determined by a schedule based wpon 
the cubical contents which in actual field operations is determined by 
the distances over and around the tent when it covers a tree. The 
distance over is easily ascertained by the marked lines across the tent— 
the sum of the two figures nearest the ground being taken. The distance 
Fic. 52.—Acid generators showing residue remaining because of careless emptying. 
(After Pierce, P. C. Jr. Ent.) 
around is often paced, but careful fumigators use a tapeline, which is 
certainly the only procedure to be recommended. The tapeline should 
be numbered in feet on both sides, the numbering of each side being 
opposite so as to admit of the use of either end without subtraction. A 
small, light snap is usually sewed to each end, to be fastened to the ring 
at the top of a short iron pin stuck in the ground to hold the loose end 
while the tape is carried around the tent. 
DOSAGE SCHEDULES. 
These schedules are printed on fairly stiff paper so that they may 
be tacked upon a board for the use of the cyanide man. The figures 
are black and large enough to be plainly seen by the light of a torch 
or lantern on the darkest night. Half and quarter ounces are omitted, 
because of the difficulty in reading the small fractions at night and 
because few scales are made to register these small amounts accurately. 
