8 
BULLETIN 1054, IT. S. DEPARTMENT OF AGRICULTURE. 
CORN 
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EXPERIMENTAL WORK. 
METHOD OF SELECTING MATERIAL. 
In order to make a logical comparison of the oils obtained by both 
the expeller and the benzol extraction processes it was necessary that 
both types of oil 
should be obtained 
from the same lot of 
germs. The mate- 
rial used in the ex- 
periments was ob- 
tained from typical 
homin}^ and glucose 
plants, the former 
producing dry- 
process germs and 
the latter wet- 
process germs. A. 
day was spent in one 
plant of each type, 
and the material 
was collected, a little 
at a time, during a 
period of about 
seven hours. In 
this w a y approxi - 
matery 150 pounds 
each of the germs 
and oil cake and 
about 5 gallons of 
expeller oil were ob- 
tained. This method 
of collecting the ma- 
terial gives reason- 
able assurance that 
the three types of 
oil, namely, the ex- 
peller oil and the 
oils extracted with 
benzol from the 
germs and from the 
cake, are derived from approximately the same germ stock. Figure 
1 shows graphically the plan according to which the material was 
collected. 
BENZOL EXTRACTION OF CORN GERMS AND OIL CAKE. 
The germs and oil cake were ground to a suitable degree of fine- 
ness, and 50 pounds at a time were extracted in a large, 
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Fig. 1. — Diagram showing the method of collecting corn ma- 
terial for the extraction of oil. This system was used in 
connection with both dry-process and wet-process germs. 
heavy, gal- 
