346 ESSENTIALS OF BOTANY 



For cabinet work the most valued of our hard woods 

 are black walnut, cherry, birch, and a good many spe- 

 cies of oak and of ash. White walnut, red or. sweet 

 gum (Liquidambar), sycamore, and holly are also used. 



1 * -;«■ •■' X J ■■*■ .V ■ ' ^/;*^ 





Fig. 234. Hickory (Hard-Wood) Forest near Southern End of 

 Appalachian Highlands. 



(After Frye.) 



In structure the broad-leaved woods may be classed 

 into two groups, — the ring-porous and the diffuse-porous 

 kinds. 



In the former most of the conspicuous ducts (the cut-off 

 ends of which appear as pores in the cross-section) are 

 found in the spring wood. In the latter the ducts are 

 scattered somewhat generally throughout the wood of the 



