Biting Insects 



139 



which must throw a mist-Hke spray for a sufficient distance. 

 Of the many nozzles in the market specially designed for 

 the purpose, the Vermorel and the McGowen or Bordeaux ^ 

 nozzles seem to have found most favor; the latter is perhaps 

 the best for general use in tree-spraying, because, although 

 somewhat coarser, it throws the stream further. For satis- 

 factory working it is 

 necessary to keep the 

 solution stirred and free 

 from coarse particles 

 which clog the nozzle. 



A common wooden 

 pail with a 1.7 -inch iron 

 gas-pipe put through the 

 bottom, which should be 

 reenforced, and with 20- 

 mesh iron wire cloth at- 

 tached half way, makes 

 an efficient strainer. 



For use in public 

 parks and on street 

 trees, a steam-pump ap- 

 paratus, which can be 

 had at from $400 u;^- 

 wards, is perhaps pref- 

 erable, although even 



Fig. 53. — Tank sprayer. 



here the hand-pump apparatus with a stronger pump, larger 

 cask and more hose, keeping the cost within $60,' may be 

 still sufficient in smaller communities, where not too many 

 trees are to be treated. 



It would lead us too far to give a description of the vari- 



• The very complete hand apparatus used in Worcester and Springfield, 

 Mass., can be had for $125. 



