8. To make semiannual inspections of the lumber-yards and store- 

 houses in order that any evidence of the presence of the insect maybe 

 prompth^ detected, and tlie infested ])ieces removed for treatment. 



4. Nothing but heartwood knnber sticks sliould be used in piles of 

 lumber liable to attack. 



5. Quantities of napthaline scattered al)()ut over the piles of lumber 

 and other material, two or three times during the year, woidd serve to 

 keep the insects away. 



6. No wood showing the slightest indication of powder-post should 

 ever be used for a finished article, or for parts of a building or other 

 structure. 



7. All im])ortnnt timbers used in wooden struc'tures should be entirely 

 free from sapwood. 



Approved : 



James \\'ilson, 



Secretary of Agriculture. 



Washington, D. C, Novemher 20, 1903. 



Note. — If correspondents wlio try an\' of the methods recommended in this 

 circular will notify the Division of Entomology of the results of their experience, 

 and offer suggestions from their practical business for experiments or lines of 

 investigations, it will aid materially in making our future publications of special 

 practical value to the interests involved. 



o 



