FOEMULAS. 185 



ing and then add the kerosene and churn through a cheap 

 force pump until emulsified. Dilute with 2% gallons of 

 water, making 1 part kerosene to 14 parts water. This 

 produces about a 7 per cent mixture. Diluting with 2 

 gallons of water about 8 per cent, is obtained ; 9 per cent, 

 with \y% gallons ; about 11 per cent with 1 gallon, and 

 some 15 per cent, with 2 quarts. This' is suflBciently 

 strong for most purposes. Yet it is well to begin with 

 the standard 7 per cent until its effect on foliage has been 

 ])ersonally observed. 



(B) Mechanical Mixture — temporarily emulsified by 

 the Kero-water Sprayers. A lever regulates the per cent, 

 of kerosene admitted to the nozzle. As the delivery, how- 

 ever, is not always exact, the Emulsion is decidedly pref- 

 erable. Kero-water Sprayers, indeed, if used at all, 

 should be carefully watched. 



4. Whale Oil Soap. 



Whale Oil Soap 1 lb. 



Water 6 gals. 



Dissolve and spray for Aphids on foliage in summer, 

 or concentrate to 1 lb. to 3 gals, of water for wash for the 

 softer scales in winter. 



5. Tobacco Infusion. 



Tobacco Stems 1 lb. 



Boiling Water 4 gals. 



Cool and strain. For Plant Lice, Flea Beetles, etc. 



6. Pybetheum. 

 (A) Decoction: 



Pyrethrum Powder 1 oz. 



Water (warm) 2 gals. 



