16 PABMERS' BULLETIN 178. 



stock utilized and sold -first; accumulations of refuse material in 

 which the insects could breed prevented ; the introduction into lum- 



FiG. 12. — Powder-posted sapwood oak veneer laid on a core of chestnut (door stock) ; 

 work of Lyctus planicoUis. Note that the heartwood oak and the chestnut have not 

 been attacked. (Original.) 



ber yards and storehouses of material infested with powder post 

 prevented; and, finally, heartwood instead of sapwood piling sticks 

 used in the piles. 



