Diagram of Cross-section through Untapped Stem (Outer Part) 

 of a Six-year-old Hevea. (Magnified 12 times.) B, Bark 

 proper. St, Groups of hardened cells in cortex. MR, 

 Layers of laticiferous vessels in cortex. C, Cambium. G, 

 Some of water-conducting vessels in wood. 



B 



'c 



Diagram of Radial (Longitudinal) Section of Stem in same 

 Tree. (Magnified 12 times.) B, Bark proper. St, 

 Groups of hardened cells in cortex. MR, Layers 

 of laticiferous vessels in cortex. C, Cambium. 



