COMPOSITION OF VARIOUS TREES 153 



By the mania for tree-planting, which sprang 

 up in Scotland in the middle of the eighteenth 

 century, much was done to remedy the ajboreal 

 destruction of more stirring times ; and many 

 species of Pinus were introduced into Scotland 

 from Russia. 



Pistacia (Pistada Lentiscus or mastich-tree ; 

 Pistada vera or Pistachio-nut tree, Natural Order, 

 Anacardiacese) is a hardy flowering tree with 

 ornamental foliage. It grows in a deep rich sandy 

 loam, in sheltered positions in the south and south- 

 west of England. 



The ashes of Pistacia contain in 100 parts : — 



The resin (mastich) is obtained by making in- 

 cisions in the bark of Pistacia Lentiscus, and is 

 used in dentistry, and for preparing varnishes and 

 cements. 



