16 



OBJECT LESSONS IN BOTANY. 



14. We also spoke of the figure of the outline of the 

 Quince leaf, which is ovate. But you must have observed 

 that there is a very great variety in the figure of leaves, af- 

 fording a very interesting study. First, we will examine, one 

 by one, the figures of the feather-veined leaves (Figs. 10-21.) 



Fig. 10. Ovate leaf of the Pear-tree. 

 Fig. 11. Lanceolate leaf of the Flowering Almond. 

 Fig. 12. Narrow lanceolate leaf of the Weeping Willow. 

 Fig. 13. Deltoid leaf of the White Birch. 



15. The leaf of the Flowering Almond (Fig. 11) is lanceo- 

 late. It is narrower than ovate, shaped like a lance, having 

 the lower half wider tlian the upper. This "Willow leaf (Fig. 

 12) is narrowly lanceolate. The leaf of the Lombardy Pop- 

 lar, or of the White Birch (Fig. 13), is so broad at the base 

 as to form a three-sided figure, like the Greek letter (A) delta. 

 Hence it is a deltoid leaf. 



14. What is the figure of the Quince leaf? 



15. Describe the figure of the leaf of Flowering Almond ; of the Weeping 

 Willow ; of the Lombardy Poplar, &c. 



