THE PATH OF LIQUIDS IN THE PLANT 
FIG. 46. Diagram showing tissue-systems in young stem of castor-oil 
plant (Ricinus ccmmunis), as seen in cross-section, ep, epidermis; 
cor, cortex; p, pith or medulla; b, fibro- vascular bundle; ph, phloem; 
ca, cambium; x, xylem; ic, interfascicular cambium. 
FIG. 47. Castor-oil plant (Ricinus communis). Cross-section of the 
stem of a plant about two years old. 
