38 THE PRINCIPAL SPECIES OF WOOD. 



Slippery Elm, Red Elm. \ ^us pubescent Wall. 

 ** J ( Ulmusfulva Michx. 



Nomenclature. (Sudworth.) 



Slippery Elm, Red Elm (local Redwooded Elm (Tenn.). 

 and common name). Moose Elm (occasional). 



Rock Elm (Tenn.). 



Locality. 



Ontario and Florida, westward intermittently to Nebraska and 

 Texas. Best developed in Western States. 



Features of Tree, 



Forty-five to sixty feet in height, one to two feet in diameter. 

 Characteristic shape, mucilaginous inner bark. Buds hairy. 

 Leaves, larger than American Elm, are rough when rubbed 

 either way. 



Color, Appearance, or Grain of Wood. 



Heartwood dark brown or red, sapwood lighter, compact 

 structure, annual layers marked by rows of large open ducts. 

 Heartwood greatly preponderates. 



Structural Qualities of Wood. 



Heavy, hard, strong, and durable in contact with soil. 



Representative Uses of Wood. 



Largely used for fence-posts, rails, railway ties, sills, sleigh- 

 runners, and wheel-stocks. Mucilaginous bark, employed in 

 medicine. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



43- 

 Modulus of Elasticity. 



1,300,000. 

 Modulus of Rupture. 



12,300. 



Remarks. 



Mucilaginous inner bark renders this species unmistakable, 

 This bark is used in medicine. 



