1908.] PUBLIC DOCUMENT- -No. 73. 157 



BROOKLINE, JULY 15, 1907. 



About 800 feet of hedges on private estates and 7 elms 35 feet in 

 height were treated during the forenoon that this outfit was under ob- 

 servation. The work was done in three different localities, and about 

 400 gallons of spray were applied. Arsenate of lead was used at the 

 rate of 13 pounds to 100 gallons of water. 



Outfit. 



A 2 1 /o horse-power Olds gasoline engine, a double-acting pump, a 

 300-gallon tank and 5 lines of V^-hich hose were used in this work. 

 Three lines of hose were equipped with single Vennorel nozzles and 

 two with 3-way Vermorel nozzles. The pressure ranged from 30 to 80 

 pounds. 



Cost. 



1 foreman, \ day, $2 50 $1 25 



1 engineer, \ day, 2 00 1 00 



1 climber, 4- day, 2 25 1 13 



4 men, \ day, . . 2 00 4 00 



1 team, * day, . 4 00 2 00 



52 pounds arsenate of lead, . 11 



1 gallon gasoline, . . . 18 18 



Oil, grease and waste, . . 05 



Total cost for \ day,. $15 33 



WOBURN, JULY 16, 1907. 



Spraying of street trees. Fifteen large elms were treated with 300 

 gallons of spray, containing arsenate of lead at the rate of 20 pounds 

 to 100 gallons of water. All the trees were over 60 feet in height, and 

 were climbed. 



Outfit. 



A Niagara gas sprayer supplied two lines of i/^-inch hose, to which 

 extension poles and Bordeaux nozzles were attached. 



Cost. 



4 men, * day, . . $2 50 $5 00 



1 horse, day, . 2 00 1 00 



60 pounds arsenate of lead, . 1 1 G GO 



Gas, 1 00 



Total, . . $13 60 



Average cost of ti-eatment, 90.6 cents per tree. It should be noted 

 that an excessively large quantity of arsenate of lead was used. 



