14 REPORT OF THE AGRICULTURAL RESEARCH INSTITUTE 



the amount of albuminoids was high the carbohydrate con- 

 tent was low and vice versa. 



The amount of phosphoric acid is always very slightly 

 less than half of the total mineral matter present. Potash 

 is, again, very nearly half of the amount of phosphoric acid 

 present. 



The effect of polishing. The composition of polished 

 rice is dependent somewhat on that of the original unhusked 

 rice. But although the amount of substance removed as 

 bran is not very much, the grain suffers a material alteration 

 in composition. The polished rice becomes poorer in all 

 constituents except soluble carbohydrates which increase a 

 little. The amount of oil decreases to less than half; the- 

 albuminoids suffer only a slight diminution, the fibre is 

 reduced to about one- fourth of the original quantity and the 

 amount of mineral constituents falls to a half. The outer 

 layer and the embryo which are removed during the polish- 

 ing operation are thus seen to be richer than the inner 

 material in all these constituents. But the concentrations 

 of fibre and oil in the bran are relatively higher than that 

 of the mineral constituents. The distribution of the albumi- 

 noids is more uniform than that of any of the above. 



It has been noted already that in the unpolished grain 

 the quantity of phosphoric acid is just less than half of the 

 ash. In the polished rice also, the phosphoric acid is 

 slightly less than half of the amount of ash. The potash 

 content, however, which in the unpolished rice is about half 

 of that of the phosphoric acid now rises to about three- 

 fourth of the amount of phosphoric acid. 



It thus amounts to this that, although both phosphoric 

 acid and potash are more concentrated in the " bran " than 

 in the rest of the seed, the distribution of the potash is more 

 uniform than that of the phosphoric acid. 



As regards the material lost during the operation of 

 polishing, this consists of the plant embryo and some of the 

 outer layers of the grain. The germ being freely exposed 

 and not embedded in the grain is easily rubbed off, the little 



