JO MAINE AGRICULTURAL EXPERIMENT STATION. 



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 forcibly 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). 

 This is the strength ordinarily used for the destruction of suck- 

 ing insects upon plants. For larger or small quantities, prepare 

 in the same proportions. 



Sometimes the emulsion is not perfect and a little oil rises 

 to the top. In such cases, if the last in the barrel or tank is 

 pumped out upon the foliage, it is likely to burn it. So it is 

 advisable, unless the emulsion is of good quality, to throw out 

 the last few gallons, making no use of it. 



It is best to dilute and apply kerosene emulsion as soon as it 

 is. prepared. 



Avoid using alkali or any hard water in making the emul- 

 sion, as it will cause the oil to separate and rise to the top. Any 

 clean, soft water will usually give good results. 



Tobacco Decoction. 



Tobacco stems or tobacco dust* 2 pounds 



Water 4 gallons 



Put the tobacco in the water, enough to cover, which may be 

 either cold or hot. Place over the fire and when the water has 

 reached the boiling point, remove some of the fire and allow 

 the water to simply simmer for fully one hour, when the liquid 

 is ready to be drained off", diluted to the above proportions and 

 applied. Boiling violently drives off the nicotine. 



*Refuse from cigar factories. 



