UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 574 



J^> Joint Contribution from the Bureau of Plant Industry, **wi 

 WM. A. TAYLOR, Chief, and the Bureau of Markets, SJ 



CHARLES J. BRAND, Chief JfrEF^fU 



Washington, D. C. T September 28, 1917 



THE CONVERSION OF THE WEIGHTS OF ME- 

 CHANICAL SEPARATIONS OF CORN, WHEAT, AND 

 OTHER GRAINS INTO PERCENTAGES. 1 



By E. G. Boerner, Grain Supervisor. 



CONTENTS. 



Method of obtaining representative samples. . 1 | Directions for using the tables. 



METHOD OF OBTAINING REPRESENTATIVE SAMPLES. 



The rules and regulations for the enforcement of the United States 

 Grain Standards Act prescribe a definite procedure for securing a 

 representative sample upon which the grade of any particular lot or 

 parcel of shelled corn or wheat is to be based. 



The rules provide that the original sample must be not less than 

 2 quarts in quantity, of which approximately 1 §• pints must be placed 

 in an air-tight container and the remainder inclosed in a cloth sack. 

 The portion in the container is intended for the determination of the 

 percentage of moisture, and this portion should be used for that test 

 only. The remainder of the sample, contained in a cloth bag, will 

 approximate 2\ pints, and this portion is to be used for the remain- 

 ing determinations, which for wheat include color, wheat of other 

 classes, damaged kernels, inseparable material, and dockage, and for 

 corn include color, damaged corn (not including heat damage), heat- 

 damaged corn, and foreign material and cracked corn. The grades 

 specify maximum and minimum percentages for the factors men- 

 tioned, and these percentages are to be determined by weight. 



1 The work covered by this bulletin was begun under the direction of Dr. J. W. T. Duvel, of the Office 

 of Grain Standardization of the Bureau of Plant Industry. Since Aug. 18, 1916, the grain-standardization 

 work of the Department of Agriculture has been administered jointly by the Bureau of Markets and the 

 Bureau of Plant Industry in connection with the administration of the United States Grain Standards 

 Act. 



105413°— 17— Bull. 574 1 



