KEROSENE EMULSION'. 



.Stock solution (66 per cent oil). 



Kerosene (coal-oil, lamp-oil) gallons.. 2 



Whale-oil or laundry soap (or I quart soft soap) pound., i 



Water gallon 1 



Dissolve the soap in boiling water, then remove from the fire, add the 

 kerosene immediately and thoroughly agitate the mixture until a creamy 

 solution is obtained. This can be done by pouring the mixture into 

 the tank of a spray-pump and pumping the liquid through the nozzle 

 back into the tank. This is a stock solution, which must be diluted 

 before using. In order to make a 10 per cent emulsion, add to each 

 gallon of the stock solution about 6 gallons of water and agitate thor- 

 oughly before using. For a 30 per cent solution add to each gallon of 

 the stock solution Ijt gallons of water and agitate thoroughly. This 

 strength will kill a large percentage of the hibernating females, without 

 injury to the trees. 



If a good naphtha soap can be obtained, the preparation of the emul- 

 sion will be simplified. It will be unnecessary to heat the solution, 

 since the kerosene will combine readily with the naphtha and soap and 

 form a perfect, cold, milky-white emulsion when the mixture is thor- 

 oughly agitated. If naphtha soap is used, double the amount called 

 for by the formula, and emulsify in soft (rain) water. 



Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, September 7, 1905. 



O 



