150 GYPSY AND BROWN-TAIL MOTHS. [Jan. 



Cost. 



8 men, 4 days, . . 82 25 $72 00 



1 man, 1 .lays, . 2 00 S 00 



1 team and driver, 4 days, . 5 00 20 00 



360 pounds arsenate of lead, . . 12 43 2Q 



8 gallons gasoline, . ... 20 1 60 



Oil, grease and waste, ........ 20 



Total, . . SI 45 00 



Average cost of treatment, $36.25 per acre, or, if figured on basis 

 of trees, 76.3 cents per tree. 



ARLINGTON, JULY 2, 1907. 



A mixed hardwood growth, ranging from 40 to 50 feet in height, was 

 treated on this date. Sixteen trees were sprayed in one hour with one 

 tank of spray, and from the difficulty of obtaining water near by, one 

 hour was required to refill the tank. 



Outfit. 



A ] (ID-Gallon tank, in which was mounted a Ware double-acting hand 

 pump, supplied 2 lines of 1 2-inch hose, to which spray-holes and Bor- 

 deaux nozzles were attached. Fifteen pounds of Swift's arsenate of 

 lead were used to 100 gallons of water. Two men were required to 

 operate the pump. 



Cost. 



3 men, } day, . . . . S2 2.3 SI 69 



2 men, i day, . . 2 00 1 00 



1 horse, i day, . 1 50 38 



15 pounds arsenate of lead, . . . . . . 12 1 80 



Total, . . S4 8 



e cost of treatment, about 30.4 cents per tree. 



ARLINGTON, JULY 2, 1907. 



In spraying the hospital lot two Pomona hand pumps were used in 

 treating l.SOO mixed hardwood trees, averaging 30 feet in height. 

 About ;.<) per cent, of the (roes were climbed, and 3 men were employed 

 in supplying water for the tanks. 



Outfit. 



K.-ich j. ui7i|i was mounted in a 50-gallon barrel, earned on a wheel 

 truck. Two lines of ! --inch hose with Bordeaux nozzles were used 







with each outfit. 



