UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 330 



Contribution from the Bureau of Plant Industry, WM. A. TAYLOR, Chief, 

 and the Bureau of Chemistry, CARL L. ALSBERG, Chief 



Washington, D. C. 



January 8, 1916 



THE MILLING OF RICE AND ITS 



MECHANICAL AND CHEMICAL EFFECT 



UPON THE GRAIN 



By 



F. B. WISE, Assistant, Office of Grain Standardization, and 

 A. W. BROOMELL, Assistant Chemist, Food- 

 Control Laboratory 



CONTENTS 



Page 



Introduction ■ ■ • 1 



Geographical Distribution and Value 



of the Rice Crop 1 



Structure of the Rice Grain .... 2 



Milling Methods 4 



Evolution of Rice Milling 4 



Primitive Methods 4 



Modern Milling 7 



Page 



Effects of Milling on Rice 14 



Mechanical Effect 14 



Chemical Effect 18 



Milled P.ice and Its By-Products ... 22 



Mechanical Analyses and Mill Yields . 22 



Chemical Analyses 26 



Summary 29 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1916 



