192 Nebraska Agricultural Exp. Station, Research Bui. 6. 
DESCRIPTION OF PLATE I. 
Fig. 1. — Longitudinal section of root tip. X 40. 
Fig. 2. — Cross section of root some distance back of tip. X 40. 
Fig. 3. — Cross section of small stem (1/5 sector). X 6. 
Fig. 4. — Cross section of portion of leaf. X 40. 
Fig. 5. — Surface view of lower leaf epidermis. X 40. 
