13 



The hairs found in barley are of two kinds, one of which has 

 walls thinner than the cell ca\'ity and are less than loO/z long. 



Figure 6 

 Fig. 6. Barley. (1) Palet showing (t) twin cells and (c) circular cells; 

 Haii-s from (2) inner and (3) outer epidermis; (4) Spongy parenchyma and 

 (5) starch grains. 



usually, and the second in which the hairs are somewhat shorter, 

 and have very thick walls and a narrow cell cavity or lumen. 



The starch grains are also of use in the diagnosis of barley 

 and are usually found in most of the bA'-products. They are of 

 two sizes; large grains circular or disk-shaped from 20 — SO/j. in 

 diameter, and smaller grains less than T/j. in diameter. The hilum 

 is not always evident, but is sometimes cleft. The small grains 



