namely, large lenticular grains from 30 — 40/x in diameter, with 

 faintly \'isible laminae and hilum, and small rounded or some- 

 what polygonal grains less than 8^ in diameter. With polarized 

 light, indistinct crosses are evident, and the selenite plate gives 

 but a faint display of colors. 



The hairs, which are found up to 1 mm. in length, are usually 

 awl shaped, with a rounded base about 25 ix in diameter. The 

 cell cavity, which appears black under the microscope, is much 

 narrower than the hair walls, but extends well up into the tip 

 of the hair. 



The cross cells are found in the bran coats and are more or 

 less characteristic of wheat. They are transversely elongated, 

 and are arranged side by side in rows, with porous cell walls. 

 Usually the cells are from 100 — 200 fx long and 15 — 25 m in di- 

 ameter. The side walls are about 4 — 7 /x thick, but the end 

 walls are usually much thinner, and are not swollen by alkali; 

 a distinction from rye. 



Crossing this layer of cells are usually found more or less 

 detached layers of cells to which the name of tube cells is given. 

 These cells vary greatly in size, but are characteristic of wheat, 

 as in the case of the other cereals this layer of cells is less broken 

 up. 



The starch grains and the cross cells are the most useful 

 elements in diagnosing wheat products. Fig. 1 shows the ele- 

 ments noted. 



MAIZE— INDIAN CORN. 



{Zea Mays, L.) 



Indian corn is one of the most important constituents of 

 cattle foods; it occurs in various forms, such as cracked corn 

 in which the kernel is broken up into large, coarse fragments; 

 com meal, a finer ground feed; hominy feed in which the 

 particles are ground very fine and in which some of the bran is 

 usually present, and com and cob meal which contains besides 

 the corn, ground fragments of the cob. 



The horny part of the kernel is usually white or yellow in 

 color, and has usually enough of the starch endosperm adhering 

 to suffice for identification. The coarser particles are readily 



