10 



size. They are found singly and in aggregates of from two to 

 many grains. Sharply polygonal grains predominate, but there 

 are also many grains with one or more rounded facets which come 

 from the outer portion of the aggregates, which are oval in form 

 and usually present. No laminae are visible, but the hilum is 

 as a rule evident and is central. With polarized light distinct 

 crosses are seen, but it is extremely difficult to observe any marked 

 play of colors with the selenite plate. 



Rice hulls and rice bran are sometimes found in food 

 stuffs. The chief distinguishing characteristics of rice hulls 

 are the rectangular epidermal cells with thick convoluted walls. 

 These are best seen when the preparation is cleared with chloral 

 hydrate or potash. Another striking characteristic of the hulls 

 is the broadly linear-lanceolate hairs which are abundant along 

 the edges of the glume. When a dry portion of the layer is 

 scraped with a needle its silicious character is easily detected. 



Rice bran may be identified by the cells of the epicarp. These 

 cells are from 100 — 500/x long and from 30 — lOOfx in width; are 

 transversely elongated and have peculiar wavy end walls. (Fig. 

 3.) They are arranged side by side in rows. The presence of 

 rice starch is usually noted in all rice bran preparations. Bran, 

 however, is not in general use at present as a cattle food. 



MILLET. 



{Panicuvi miliaceum, L.) 



Millet is one of the oldest cereal grains known and is still 



Figure 4 

 Fig. 4. Millet. Starch cells showing beaded network left after treating 

 with dilute alkali. 



