Ch. IV, 2] 



STRUCTURE OF STEMS 



117 



Fig. 71. 



Fig. 72. 



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



the tissues of a typical stem. Explanation in the text. Secondary growth 



in the lower of the longitudinal sections. The cambium is left white. 



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



type of stem. 



(From Sargent, Plants and tlieir Uses.) s 



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