ADVANTAGES UNDER THE IMPROVED SYSTEM. 



63 



his measurements and calls out the dosage. The two men then 

 measure out. the rec[uired amount of chemicals and dose the tree (fig. 

 27). Wliile they are thus engaged the estimator has moved on to 

 the next tree, determined the proper dosage, and holds the generator 

 in readiness when the cart is brought up. He then calls out the 

 dosage w4th which the tree is to be treated. This procedure contin- 

 ues in hke manner imtil the entire row is fumigated. 



Outfits emplo3ang this system' have, on an average, been fumigat- 

 ing a complete set of 32 tents in from forty to forty-five minutes. 



Fig. 



-Dosing a tree. (Original.) 



This would appear to demonstrate that the system is entirely practi- 

 cable from the standpoint of time economy, as tents are usually 

 recpnred to be left on the tree one hour. 



ADVANTAGES UNDER THIS SYSTEM. 



First. — The element of guesswork in estimating dosage and the 

 conseciuent waste of cyanid are eliminated, since the dosage is deter- 

 mined according to a uniform method in all cases. If a dosage of suf- 

 ficient strength to destroy 90 per cent of the purple scale is used, 

 practically 90 per cent of the purple scale is killed on every tree 

 throughout that orchard — not 90 per cent on some trees and 50 per 

 cent, more or less, on others, which has occurred at times under the 

 old method. Or if a dosage strength just sufficient to eradicate the 

 pest is employed, a like result will occur throughout the orchard and 

 there will be no great waste of cyanid by reason of many trees 

 recei\nng a larger dosage than was necessary. 



