308 



ELEMENTARY STUDIES IN INSECT LIFE 



on the blade, more lime should lu> added until the knife- 

 blade can be withdrawn untainted. Bordeaux mixture 



FIG. 233. Seneca spray-nozzle, giving fan-shaped spray covering considerable 

 area, and throwing coarse spray. Adapted to throwing spray some distance. 



when used with Paris green solution can be used as so 

 much water; that is, if the amount of water required 

 in mixing up the Paris green solution is 150 gallons, 

 pour in the 40 gallons of Bordeaux mixture and then 

 add the balance or 110 gallons of water, making the 

 150 gallons of solution of Paris green. 



FIG. 234. Vermorel spray-nozzle, affording a conical discharge and fine spray 

 or mist. Adapted to spraying of trees, etc., at close range. 



SPRAYING MACHINERY. - To secure satisfactory re- 

 sults in spraying, the spray must be kept agitated while 

 being applied, and the application of the spray, as its 

 name implies, should be as a fine mist. The agita- 



