24 FARMERS’ BULLETIN 650. 
Pure Crupre PETROLEUM. 
Pure crude petroleum is used in identically the same manner as 
pure kerosene, and the same cautions as to its use should be remem- 
bered. The crude oil employed in the East is known as “insectide 
oil” and has a specific gravity of 43 to 45 degrees on the Baumé scale. 
KEROSENE Emutsion (Stock SoLuTION 66 PER Cent Orn). 
Kerosene emulsion is made after the following formula: 
Kerosene (coaliol aamp:oil). .... Gae 1.02 eee tee a. 2 gallons.. 2 
Fish-oil soap or laundry soap (or 1 quart of soft soap)......-- pound... 4 
Waker aoe ee rer... «2. - ioc See eat gallon.. 1 
Fic. 14.—Bucket spray pump suitable for use in yards. (Author’s illustration.) 
Dissolve the soap in boiling water; then remove the vessel from the 
fire. Immediately add the kerosene and thoroughly agitate the 
mixture until a creamy solution results. The stock emulsion may be 
more conveniently made by pouring the mixture into the tank of a 
spray pump and pumping the liquid through the nozzle back into 
the tank for some minutes. The stock solution, if well made, will 
keep for some months, and is to be diluted before using. In order to 
make a 10 per cent spray (the strength for trees in foliage), add to 
each 1 gallon of the stock solution about 53 gallons of water. For 
20 and 25 per cent emulsions (for use on dormant trees and plants), 
use, respectively, about 24 gallons and 13 gallons of water for each 1 
gallon of stock emulsion. Agitate the mixture in all cases after 
adding the water. The preparation of the emulsion will be simplified 
by theuseof anaphthasoap. No heatwillthen berequired, as the kero- 
