THE PATH OF LIQUIDS IN THE PLANT 63 



Fig. 46. — Diagram showing tissue-systems in young stem of castor-oil 

 plant (Ricinus cctnmunis), 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. 



I 



