PLATE s 
A. —Section through tuber bud initial. XH 3 . 
B. —Radial section of epidermis and adjacent cortical cells of stolon tip. X583. 
C. —Mitotic division in young stolon cells. X583. 
D. —Mitotic division—late meta- and telo-phase. X583. 
E. —Mitotic division—metaphase. X583. 
F. —Mitotic division—anaphase. X583. 
G. —Phloem cells with elongated nuclei. X583. 
