94 



THE FOREST TENT CATERPILLAR 



FIG. 33 



five ounces of Paris green and a pint 

 or two of fresh lime-water- made 

 by slaking lime in water to a bar- 

 rel holding forty or fifty gallons of 

 water. This is thoroughly mixed 

 and sprayed upon the trees by means 

 of a force pump and spray nozzle. 

 In Fig. 33 a simple and effective 

 spraying outfit is represented. It 

 consists of a kerosene barrel holding 

 fifty gallons, a force pump having a 

 double discharge, with a short line 

 of hose running into the barrel to 

 keep the liquid stirred, and a long 

 line of hose fitted at the end to a 

 slender brass rod tipped with a spray 

 ' nozzle. This outfit, or a great va- 

 riety of similar ones, may be ob- 

 tained through any hardware dealer 

 or direct from any of the numerous 

 manufacturers of spraying machin- 

 ery. 



In case it is desired to spray trees 

 of many sorts, it would probably be 

 safer to use arsenate of lead, which 

 is less liable to injure foliage than 

 Paris green. This substance has 

 been used in great quantities by the 

 Massachusetts Gypsy Moth Com- 

 mission. It has been found a safe 

 insecticide for all sorts of trees. It is 

 not generally on sale in the 

 market, but can be made 

 according to the following 

 directions of Professor C. H. 

 Fernald : 



"Arsenate of lead is easily 

 prepared by putting n 



