618 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



Boiled Emulsion. 



FORMULA. 



Paraffin oil 2 gallons 



Water 1 gallon 



Fish-oil soap 2 pounds 



or 



Hard soap 2 pounds 



"Directions. Put oil, water, and soap into a kettle or other 

 vessel that will stand fire, and heat to the boiling point. While 

 still very hot, pump the material into another vessel and then back 

 again. Emulsion can not be made by this formula without a 

 pump; stirring is not sufficient. 



" Dilute to make 200 gallons of spray material. 



" For making the above formula the writer has used 9 and 15- 

 gallon kettles, wash boilers, and 100-gallon oil tanks with uniform 

 success. 



" If it is desirable to make this formula on a somewhat larger 

 scale, the materials can be heated in a large kettle or other vessel 

 and then dipped into a barrel pump outfit and the mixture emulsi- 

 fied by pumping it back upon itself. For safety it is best to have 

 all the material pass through the pump twice, but it must not be 

 pumped after it has become cool. Excessive pumping will break 

 up a good emulsion. It can also be heated in a large galvanized 

 oil tank having a capacity of 4 barrels and emulsified by means of 

 the spraying machine. In this case the suction hose should be 

 put into the tank of hot material and the discharge hose into the 

 spray tank. For the second pumping, put the suction hose into 

 the spray tank and the discharge hose into the storage barrels. 

 When the spraying machine is used for this purpose, an old suction 

 hose should be used, as well as a discarded piece of hose for the 

 discharge end. This should be not more than 10 feet in length. 

 The material should be run through an ordinary nozzle with the 

 disk left off. The overflow will not emulsify this material. 



" Owing to the high temperature of the mixture, pumps used 

 for emulsifying should have metal valves. If made of other 

 material their period of usefulness is very short. It should always 

 be remembered that a pressure pump must be used for emulsifying. 

 The writer has never succeeded in making an emulsion with a 

 rotary pump. 



