ioS THE MICROSCOPE. 



•f these cells are more delicate than the corresponding ones 

 ©f wheat. The cells of the central part containing starch are 

 also more delicate, and when empty resemble thin walled fibrous 

 structure. 



If we cut open a kernel of barley and scrape a little of the 

 vrhite powder from the center, we will find there are present 

 two kinds of starch grains, both large and small. The large 

 grains are lenticular ; when seen on the face they are round 

 •r nearly so. but when seen on the edge they are oval, fre- 

 quently showing a longitudinal furrow. A faint nucleus is present 



jFig. I. Barley Starch. X 4j^. {Drawn ivith the camera lucida.) 



and faint rings are seen in a few of the grains, though not in 

 all of them. The average size is about one sixteen-hundredth 

 ©f an inch in diameter. The small grains are angular, dark 

 .and not collected in masses as in many of the starches. The 

 whole appearance of barley starch is much more delicate than 

 that of wheat. The large grains are smaller, more nearly spher- 

 ical and more opaque. The small grains are smaller, more uni- 

 form in size and fewer in number than the corresponding ones 

 of wheat. These small grains are one seven-thousandth oi an 

 inch in diameter, and frequently have a nucleus. There is no 

 cross when viewed with polarized light. 



