PLATE 8 
A. —Tannin vesicles in parenchyma cells of bud. X74. 
B. —Cross section of a normal potato periderm. X133. 
C. —Tannin vesicles in cells of cortex, showing inner structure. X312. 
D. —Cross section of a hypertrophied periderm. X133. 
E. —Cross section of lenticel with hypertrophied periderm. X133. 
