18 



BULLETIN 330, U. S. DEPARTMENT OP AGRICULTURE. 



parison of the relative sizes or weights of the grains of the two types 

 is clearly shown in Table V. 



Table V. — Effect of various rice-milling machines on the weight per 1,000 



kernels of rice. 



Milling stage. 



Average weight of rice 

 samples (grams). 



Honduras 



type, 9 

 ' samples. 



Japan type, 

 5 samples. 



Paddy machine 



Hullers and pearling cone 

 Brush, brewer's rice: 



In 



Out 



Trumbles 



24.13 

 22.80 



22.07 

 22.20 

 22.35 



22.44 

 21.50 



20.20 

 20.40 

 20.56 



Figure 7 illustrates the data contained in Table V and shows the 

 gradual decrease in weight per 1,000 kernels of rice of the Honduras 



and Japan types as 

 tkum- the milling process 

 proceeds. 





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CHEMICAL EFFECT. 



Figures in Lou- 

 isiana Agricultural 

 Experiment Station 

 Bulletin 24 (first se- 

 ries), 1889, show the 

 difference in chem- 

 ical composition of 

 one lot of rice at va- 

 rious stages in the old 

 mortar- and- pestle 

 milling process in 

 Louisiana. 



Similar results 

 were obtained by 

 McDonnell (1901), 

 South Carolina Ag- 

 ricultural Experi- 

 ment Station Bulletin 59, on the product of a South Carolina mill of 

 the same type. Apparently the scouring proceeded further, however, 

 than in the case of the Louisiana mill. The analyses of both lots are 

 shown in Table VI. 



The chemical analyses of samples of rice of the Japan type milled 

 in a " plantation huller," also given in Table VI, were made in the 

 Bureau of Chemistry, Department of Agriculture, according to the 



Fig. 7. — Diagram showing the effect of various milling ma- 

 chines on the weight per thousand kernels of the Honduras 

 and Japan types of rice. 



