Ch. IV, 2] 



STRUCTURE OF STEMS 



ii: 



Fig. ri. 



Fig. 72. 



Fig. 71. — Generalized sectional drawings, based on the Maple, to show 

 the tissues of a t\"pical stem. Explanation in the tert. Secondary growth 

 begLns in the lower of the longitudinal sections. The camhitim is left white. 



Fig. 72. — Companion series to Fig. 71. based on a Palm as the other 

 tjTje of stem. 



(From Sargent, Plants and their Uses.) 



