94 TKCHNICAL rROPERTIES OF WOOD. 



Vn-i/ Durahlc Wood. 



Pedunculate oak : Grown in the open in a mild climate and on 

 moist, but not wet soil. 



Larch : With Avell-developed heartwood, highly resinous, not 

 too old, especially when grown in middle Alpine localities (4000 

 to 5000 feet altitude). 



Sessile oak : As durable as pedunculate oak in dry places, but 

 inferior to best larchwood when exposed to damp. 



Scotch pine : From old trees, highly resinous, with well- 

 developed, moderate-sized annual zones and well-developed 

 summer-wood. (Baltic red deal.) 



Black, or Corsican pine : Of similar nature to the above Scotch 

 pine. Especially valuable for water-pipes or -channels. 



Mountain-pine : The erect variety {Pintts iito)it(ina var. 

 iincinata, liamond) is best. 



Robinia : Sometimes more durable than oak. (False acacia, 

 or locust.) 



Sweet chestnut: More durable in the ground than oak or 

 robinia coppice-wood. 



Common elm : From fertile, warm situations ; is not liable to 

 be worm-eaten. 



Durable Wood. 



Ash : Only fit for use under cover, or partially so, as in the 

 case of carts or agricultural implements — then very durable. 



Larch : From lowlands, or with little heartwood. 



Scotch pine : Rapidly grown, with narrow zones of summer- 

 wood and only moderately resinous. 



Spruce : From high altitudes or latitudes, with narrow zones 

 and resinous. (Baltic white deal.) 



Silver-fir : About as good as spruce from moderate altitudes ; 

 more suited for use under cover. 



[Silvcr-fir is preferred to spruce wlien Ijotli are grown in I^ritaiu. 

 -Tr.] 



Wood of I Attic ])iind>ilit!j. 



Cluickly grown and slightly resinous coniferous woods, especially 

 from lowlands, should be used only under cover ; they are very 



