92 DEPARTMENT BULLETIN 1216, U. S. DEPT. OF AGRICULTURE 
Oils. — Two 50-gram samples of well-mixed emulsion shall be placed in a stand- 
ard 3-ounce tin box, in -an oven at 163° C. (325° F.) for five hours, and the loss 
determined. If the loss is greater than the percentage of water (see preceding 
paragraph) it would indicate the presence of volatile oils and the difference in 
the two determinations would closely approximate the percentage of volatile 
oil. 
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-C 
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1 
1 
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1 
1 
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1 
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The residue of the 50-gram sample shall be dissolved in benzol, filtered, and 
the filtrate evaporated on a water bath until practicallv all the benzol is 
evaporated, then placed in an oven at 105° <\ (221° F.) for 30 minutes and 
finally heated on a hot plate to 121° C. (250° F.) with constant stirring. The 
consistency, ductility, or other tests desired are made upon this residue. 
Mineral matter.— The mineral matter on the filter paper from the extraction 
shall be dried and weighed or a separate determination on a smaller sample of 
the original emulsion may be made. 
