PLATE XXII. 



Acacia iRobinia), Tangential section. 

 The annual rings being cut obliquely 

 appear as loops fringed by the pores. 

 (Nat, size.) 



Fig. 178. 



Boxwood. Transverse section showing 

 minute lozenge-shaped Pith (X 3 diam.) 



W: , V 



tf; 





m$ 



Fig. 177. 

 Oregon Pine. Tangential section. 

 As there are no pores the annual rings 

 appear as loops with clean-cut edges. 

 The narrow streaks crossing them 

 obliquely, are Vertical Resin-Canals. 

 The minute dots are Horizontal Reski- 

 Canals. (Nat. size.) 



Fig. 179. 



Lancewood (Duguetia), showing peculiar 



defect. The black streak represents an 



Ebony-like fleck. (Nat. size.) 



