CORK. 193 
The outermost layer is often in process of decay, as for in- 
stance in the potato (Fig. 108). While this perishes, new cork 
8,_cork; s’, cork-cambium or phellogen; m, layer of the primary bark; m’, containing 
crystals. 
Fi. 108.—Transverse section through the outermost layer of a potato. s, starch 
granules; er, protein crystalloid; pl, protoplasm (Tschirch). 
is continually formed from the interior (Cortex Quassie jamai- 
censis, Fig. 107). 
13 
