Explanation of Terms. 



2 39 



FIG. b. 



FIG. c. 



III. 



The EDGE of the leaf is : 



(1) Entire, when it is an even line, without indenta- 

 tions. 



(2) Toothed, when it is set with an indefinite number 

 of sharp or blunt teeth. (Fig. d.) 



FIG. d. 



(3) Lobed, when the indentations are deep and of a 

 definite number. (Figs, e, f, and^, Oaks and Poplar.) 



IV. 



THE SHAPE OF THE WHOLE LEAF. The leaf is : 

 (i) Needle- or line-shaped, when it is very narrow (some- 

 times no more than a line), and of about the same width 

 throughout. (Fig. //, Pine.) 



