EXOGENOUS SERIES-NEEDLELEJF MODS. 



\ Kauri Pine. Dammar a australis. 



Nomenclature. 



Kauri pme (local and gen . Cowdie p . ne 



and many localities). 

 Locality. 



New Zealand. 

 Features of Tree. 



Ninety to one hundred feet in height, three to four feet in 

 diameter, occasional specimens much larger Small leaves 

 resembling those of box. A tall handsome tree. 

 Color, Appearance, or Grain of Wood. 



Heartwood straw-colored, fine, straight grain, with silky lustre 

 suggesting satmwood. " Mottled kauri " is separated and used 

 for cabinet work. 



Structural Qualities of Wood. 



Moderately hard, light, elastic, strong, seasons well, works 

 readily, receives high polish, is quite free from knots, it stands 

 well, wears evenly, and has an agreeable odor. 

 Representative Uses of Wood. 

 Carpentry, masts. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 

 33 (Lazlett *) (varies with locality). 



Modulus of Elasticity. 

 1,810,000 (Lazlett). 



Modulus of Rupture. 



Remarks. 



The species is widely known by reason of its resin. 



* Table CLXXI, p. 426. 



A true gum dissolves in water, whereas a true resin yields to oil or 

 spirit. The name resin is seldom used by varnish makers, and the name 

 gum applies commercially tt> many substances that are actually resins. 

 Varnish resins may be roughly divided as they unite with oil or spirit. 

 Oil varnish differs from spirit varnish in that oil takes permanent place as 

 part of the whole, whereas spirit simply dissolves the varnish ingredients 

 and then evaporates from them. Kauri is one of the best of the oil- 

 varnish resins. Shellac is an equally useful spirit-varnish resin. A 

 varnish differs from a paint in that a varnish is a solution, whereas a 

 paint is a mechanical mixture. 



