CHAPTER IX. 



Leaves. 



115. The Mm Leaf. — Sketch the leafy twig of elm that is supplied 

 to you.i 



Eeport on the following points : ' 



(a) How many rows of leaves ? 



(6) How much overlapping of leaves when the twig is held with the 

 upper sides of the leaves toward you ? Can you suggest a reason for 



Fig. 63. — General Outline of Leaves. 



o, linear ; b, lanceolate ; c, wedge-shaped ; d^ spatulate ; c, ovate ; /, obovate ; 



g, kidney-shaped ; A, orbicular ; i, elliptical. 



' Any elm will answer the purpose. Young strong shoots which extend horizon- 

 tally are best, since in these leaves are most fully developed and their distribution 

 along the twig appears most clearly. Other good kinds of leaves with which to begin 

 the study, if elm leaves are not available, are those of beech, oak, willow, peach. 



