SPECIES OF WOODS. 



167 



Physical Qualities: Heavy (12th in 

 .this list), 45 Ibs. per cu. ft.; sp. gr., 

 0.7333; very strong (1st in this list); 

 elastic (9th in this list) ; very hard 

 (6th in this list) ; shrinkage, 5 per 

 cent.; warps badly, very durable; hard 

 to work, tough; splits in nailing. 



Common Uses: Shipbuilding, con- 

 struction, "tree-nails" or pins, wagon 

 hubs. 



Remarks: Widely planted and cul- 

 tivated east and west. Likely to be in- 

 fested with borers. 



Radial Section, 

 life size. 



Cross-section, 

 magnified 37 H diameters. 



Tangential Section, 

 life size. 



