Figure 110. A, Cross section of a young cotton seed showing the cells of 

 the epidermal layer in the process of elongation to form cotton fibers and 

 certain cells of the outer integument of the seed filled with starch (420 X). 

 B, Starch-forming plastid from an integument cell and a ceUulose-forming 

 plastid from a cotton fiber photographed together to show their comparative 

 visibihty (1100 X). 278 



