434 AGRICULTURE OF MAINE). 



the foliage or fruit. The Hme is added to prevent the Paris 

 green from burning the foHage. Slake the lime in a little water, 

 make into a thin paste and strain. Wet the Paris green with 

 a little water and make into a thin paste. Mix the lime and 

 Paris green and add the remainder of the water. 



Formula 6. lead arsenate. 



Lead arsenate 2 pounds 



Water 50 gallons 



Arsenate of lead acts slower as a poison than Paris green. 

 It has the advantage, however, of remaining longer in suspen- 

 sion in water, of not burning the foliage and of adhering better 

 than Paris green. Make a smooth thin paste with the poison 

 and a little water and add the remainder of the water and stir 

 thoroughly. In our own practice this is preferred to Formula 5. 



formulas for insects which suck. 

 Formula 7. kerosene emulsion. 



Hard soap ^ pound 



Boiling water i gallon 



Kerosene 2 s^allons 



fc>' 



To prepare, dissolve one-half pound of soap in one gallon 

 of soft water by boiling; when well dissolved and still boiling 

 hot, remove from the fire and add two gallons of kerosene, and 

 agitate at once as briskly as possible. The emulsion is more 

 readily made if the kerosene first be heated by immersing the 

 vessel containing it in a larger vessel of boiling water. Never 

 heat the kerosene over a direct fire. 



If large quantities are being made, a good way to emulsify 

 is to use a force pump and spraying nozzle and pump the mix- 

 ture as forcefully as possible back into the vessel containing it. 

 If the emulsion is properly formed, the whole mass will appear 

 much like whipped cream and will mix readily in water without 

 a film of oil rising to the top. 



As soon as emulsified, add twenty-seven gallons of water and 

 use at once. This will make thirty gallons of the mixture, and 

 such an emulsion will be one-fifteenth oil (or a 7% emulsion). 



