THE MONTHLY BULLETIN. 



327 



of it be wasted. For large doses use two or more generators to a tree. 

 To prevent unnecessary sputtering, especially when open generators are 

 used, small cheap paper bags are excellent to contain the cyanide when 

 it is dropped into the acid. 



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 



Fig. 314. — Acid generatoi-.s showing residue remaining because of careless emptying. 



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



of the two figures nearest the ground being taken. The distance around 

 is often paced, but careful fumigators use a tapeline which is certainly 

 the only procedure to be recommended. The tapeline should be nunij 

 bered 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 th^ 

 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 quarte-r ounces are omitted, 



