Diagram of Radial (Longi- 

 tudinal) Section through 

 the Lower Part of a Tap- 

 ping Area. (Magnified j 

 times.) The section was 

 made one day after the 

 last tapping. New bark 

 (B) is forming above. Of 

 six layers of laticiferous 

 vessels five have been 

 tapped. 



B 



Diagram of Longitudinal Section parallel 

 to Outer Surface across a Layer of 

 Laticiferous Vessels. (Magnified 27 

 times.) This diagram shows the longi- 

 tudinal courses of the vessels, but does 

 not exhibit their numerous cross com- 

 munications. 



B, Bark proper. St, Groups of hardened 

 cells in cortex. MR, Layers of 

 laticiferous vessels in cortex. C, 

 Cambium. Z, The bottom of tap- 

 ping groove. 



(The illustrations, by Dr S. V. Simon, on this and the previous page, are reproduced by 

 permission of Der Tropenpflanzer.~) 



