BULLETIN" 1054, U. S. DEPARTMENT OF AGEICULTUEE. 



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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- 

 Z?£(3/i~/?Af£'/? rial used in the ex- 



periments was ob- 

 tained from typical 

 hominy 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 way approxi - 

 mately 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, heavy, gal- 



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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. 



