76 



CALIFORNIA CITRUS CULTURE. 



MEASURING THE TENTS. 



The air space of the tents is determined by a schedule based upon 

 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 



FIG. 52. Acid generators showing residue remaining because of careless emptying. 

 (After Pierce, P. C. Jr. Ent.) 



around is often paced, but careful fumi gators 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. 



