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 

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



FIG. 72. Companion series to Fig. 71, based on a Palm as the othei 

 type of stem. 



(From Sargent, Plants and their Uses.) 



