EXOGENOUS SERIES BROADLEAF WOODS. 107 



Lignumvitae. Guajacum sanctum. 



Nomenclature. (Sudworth.) 



Lignumvitae (Flat.). Ironwood (Fla.), 



Locality. 



Semitropical Florida, Bahamas, San Domingo, Cuba, Puerto 

 Rico. 



Features of Tree. 



Twenty-five feet high, one foot in diameter, a, low gnarled tree. 



Color, Appearance, or Grain of Wood. 



Heartwood rich yellow-brown in younger specimens and almost 

 black in older ones. Sapwood light yellow. Close-grained, 

 compact structure. 



Structural Qualities of Wood. 



Very heavy and exceedingly hard, strong, hard to work, brittle. 



Lubricated by water. 



Representative Uses of Wood. 



Sheaves of ship-blocks, rollers, pulleys, tool-handles. Bearings 

 for journals rotating in water. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



Modulus of Elasticity. 



1,220,000. 

 Modulus of Rupture. 



I 1 , 1 00. 



Remarks. 



Two other species, Guajacum officinale and Guajacum arborium, 

 afford similar woods not commercially distinguished from 

 the above. 



